diff --git a/Makefile.am b/Makefile.am
index 630b294..eb41711 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -55,9 +55,6 @@ cpuminer_SOURCES = \
   algo/blake/mod_blakecoin.c \
   algo/blake/blakecoin.c \
   algo/blake/blakecoin-4way.c \
-  algo/blake/decred-gate.c \
-  algo/blake/decred.c \
-  algo/blake/decred-4way.c \
   algo/blake/pentablake-gate.c \
   algo/blake/pentablake-4way.c \
   algo/blake/pentablake.c \
diff --git a/RELEASE_NOTES b/RELEASE_NOTES
index d5ea8a8..3c06614 100644
--- a/RELEASE_NOTES
+++ b/RELEASE_NOTES
@@ -65,6 +65,17 @@ If not what makes it happen or not happen?
 Change Log
 ----------
 
+v3.22.0
+
+Stratum: faster netdiff calculation.
+Merged a few updates from Pooler/cpuminer:
+   Use CURLOPT_POSTFIELDS in json_rpc_call,
+   Use CURLINFO_ACTIVESOCKET when supported,
+   JSONRPC speedup,
+   Speed up hex2bin function.  
+Small log improvements, notably more frequent hash rate reports.
+Removed decred algo.
+
 v3.21.5
 
 All issues with v3.21.3 & v3.21.4 should be resolved.
@@ -77,7 +88,7 @@ Changes since v3.21.2:
      Windows binaries support CPUs with up to 64 threads.
 Small optimizations to serialized vectoring.
 
-v3.21.4
+v3.21.4 CANCELLED
 
 Reapply selected changes from v3.21.3.
 #392 #379 #389 Fixed misaligned address segfault solo mining.
@@ -86,7 +97,6 @@ Reapply selected changes from v3.21.3.
      Windows binaries no longer support CPU groups,
      Windows binaries support CPUs with up to 64 threads.
 
-
 v3.21.3.1 UNRELEASED
 
 Revert to 3.21.2
diff --git a/algo-gate-api.c b/algo-gate-api.c
index 73ec286..80584a4 100644
--- a/algo-gate-api.c
+++ b/algo-gate-api.c
@@ -263,8 +263,6 @@ void init_algo_gate( algo_gate_t* gate )
    gate->build_block_header      = (void*)&std_build_block_header;
    gate->build_extraheader       = (void*)&std_build_extraheader;
    gate->set_work_data_endian    = (void*)&do_nothing;
-   gate->calc_network_diff       = (void*)&std_calc_network_diff;
-   gate->ready_to_mine           = (void*)&std_ready_to_mine;
    gate->resync_threads          = (void*)&do_nothing;
    gate->do_this_thread          = (void*)&return_true;
    gate->longpoll_rpc_call       = (void*)&std_longpoll_rpc_call;
@@ -308,7 +306,6 @@ bool register_algo_gate( int algo, algo_gate_t *gate )
     case ALGO_BLAKECOIN:    rc = register_blakecoin_algo     ( gate ); break;
     case ALGO_BMW512:       rc = register_bmw512_algo        ( gate ); break;
     case ALGO_C11:          rc = register_c11_algo           ( gate ); break;
-    case ALGO_DECRED:       rc = register_decred_algo        ( gate ); break;
     case ALGO_DEEP:         rc = register_deep_algo          ( gate ); break;
     case ALGO_DMD_GR:       rc = register_dmd_gr_algo        ( gate ); break;
     case ALGO_GROESTL:      rc = register_groestl_algo       ( gate ); break;
@@ -427,7 +424,6 @@ const char* const algo_alias_map[][2] =
   { "blake256r8",        "blakecoin"      },
   { "blake256r8vnl",     "vanilla"        },
   { "blake256r14",       "blake"          },
-  { "blake256r14dcr",    "decred"         },
   { "diamond",           "dmd-gr"         },
   { "espers",            "hmq1725"        },
   { "flax",              "c11"            },
diff --git a/algo-gate-api.h b/algo-gate-api.h
index 0710802..8c06a09 100644
--- a/algo-gate-api.h
+++ b/algo-gate-api.h
@@ -144,7 +144,7 @@ void ( *gen_merkle_root )       ( char*, struct stratum_ctx* );
 void ( *build_extraheader )     ( struct work*, struct stratum_ctx* );
 
 void ( *build_block_header )    ( struct work*, uint32_t, uint32_t*,
-	                                uint32_t*, uint32_t, uint32_t,
+	                                uint32_t*,   uint32_t, uint32_t,
                                    unsigned char* );
 
 // Build mining.submit message
@@ -155,19 +155,13 @@ char* ( *malloc_txs_request )   ( struct work* );
 // Big endian or little endian
 void ( *set_work_data_endian )  ( struct work* );
 
-double ( *calc_network_diff )   ( struct work* );
-
-// Wait for first work
-bool ( *ready_to_mine )         ( struct work*, struct stratum_ctx*, int );
-
 // Diverge mining threads
 bool ( *do_this_thread )        ( int );
 
 // After do_this_thread
 void ( *resync_threads )        ( int, struct work* );
 
-// No longer needed
-json_t* (*longpoll_rpc_call)      ( CURL*, int*, char* );
+json_t* ( *longpoll_rpc_call )  ( CURL*, int*, char* );
 
 set_t optimizations;
 int  ( *get_work_data_size )     ();
@@ -286,8 +280,6 @@ char* std_malloc_txs_request( struct work *work );
 // Default is do_nothing, little endian is assumed
 void set_work_data_big_endian( struct work *work );
 
-double std_calc_network_diff( struct work *work );
-
 void std_build_block_header( struct work* g_work, uint32_t version,
 	                          uint32_t *prevhash,  uint32_t *merkle_root,
    	                       uint32_t ntime,      uint32_t nbits,
@@ -297,9 +289,6 @@ void std_build_extraheader( struct work *work, struct stratum_ctx *sctx );
 
 json_t* std_longpoll_rpc_call( CURL *curl, int *err, char *lp_url );
 
-bool std_ready_to_mine( struct work* work, struct stratum_ctx* stratum,
-                        int thr_id );
-
 int std_get_work_data_size();
 
 // Gate admin functions
diff --git a/algo/blake/decred-4way.c b/algo/blake/decred-4way.c
deleted file mode 100644
index 9002b54..0000000
--- a/algo/blake/decred-4way.c
+++ /dev/null
@@ -1,74 +0,0 @@
-#include "decred-gate.h"
-#include "blake-hash-4way.h"
-#include <string.h>
-#include <stdint.h>
-#include <memory.h>
-#include <unistd.h>
-
-#if defined (DECRED_4WAY)
-
-static __thread blake256_4way_context blake_mid;
-
-void decred_hash_4way( void *state, const void *input )
-{
-     uint32_t vhash[8*4] __attribute__ ((aligned (64)));
-//     uint32_t hash0[8] __attribute__ ((aligned (32)));
-//     uint32_t hash1[8] __attribute__ ((aligned (32)));
-//     uint32_t hash2[8] __attribute__ ((aligned (32)));
-//     uint32_t hash3[8] __attribute__ ((aligned (32)));
-     const void *tail = input + ( DECRED_MIDSTATE_LEN << 2 );
-     int tail_len = 180 - DECRED_MIDSTATE_LEN; 
-     blake256_4way_context ctx __attribute__ ((aligned (64)));
-
-     memcpy( &ctx, &blake_mid, sizeof(blake_mid) );
-     blake256_4way_update( &ctx, tail, tail_len );
-     blake256_4way_close( &ctx, vhash );
-     dintrlv_4x32( state, state+32, state+64, state+96, vhash, 256 );
-}
-
-int scanhash_decred_4way( struct work *work, uint32_t max_nonce,
-                          uint64_t *hashes_done, struct thr_info *mythr )
-{
-   uint32_t vdata[48*4] __attribute__ ((aligned (64)));
-   uint32_t hash[8*4] __attribute__ ((aligned (32)));
-   uint32_t _ALIGN(64) edata[48];
-   uint32_t *pdata = work->data;
-   uint32_t *ptarget = work->target;
-   const uint32_t first_nonce = pdata[DECRED_NONCE_INDEX];
-   uint32_t n = first_nonce;
-   const uint32_t HTarget = opt_benchmark ? 0x7f : ptarget[7];
-   int thr_id = mythr->id;  // thr_id arg is deprecated
-
-   // copy to buffer guaranteed to be aligned.
-   memcpy( edata, pdata, 180 );
-
-   // use the old way until  new way updated for size.
-   mm128_intrlv_4x32x( vdata, edata, edata, edata, edata, 180*8 );
-
-   blake256_4way_init( &blake_mid );
-   blake256_4way_update( &blake_mid, vdata, DECRED_MIDSTATE_LEN );
-
-   uint32_t *noncep = vdata + DECRED_NONCE_INDEX * 4;
-   do {
-      * noncep    = n;
-      *(noncep+1) = n+1;
-      *(noncep+2) = n+2;
-      *(noncep+3) = n+3;
-
-      decred_hash_4way( hash, vdata );
-
-      for ( int i = 0; i < 4; i++ )
-      if (  (hash+(i<<3))[7] <= HTarget )
-      if ( fulltest( hash+(i<<3), ptarget ) && !opt_benchmark )
-      {
-          pdata[DECRED_NONCE_INDEX] = n+i;
-          submit_solution( work, hash+(i<<3), mythr );
-      }
-      n += 4;
-  } while ( (n < max_nonce) && !work_restart[thr_id].restart );
-
-  *hashes_done = n - first_nonce + 1;
-  return 0;
-}
-
-#endif
diff --git a/algo/blake/decred-gate.c b/algo/blake/decred-gate.c
deleted file mode 100644
index bee00dd..0000000
--- a/algo/blake/decred-gate.c
+++ /dev/null
@@ -1,171 +0,0 @@
-#include "decred-gate.h"
-#include <unistd.h>
-#include <memory.h>
-#include <string.h>
-
-uint32_t *decred_get_nonceptr( uint32_t *work_data )
-{
-   return &work_data[ DECRED_NONCE_INDEX ];
-}
-
-long double decred_calc_network_diff( struct work* work )
-{
-   // sample for diff 43.281 : 1c05ea29
-   // todo: endian reversed on longpoll could be zr5 specific...
-   uint32_t nbits = work->data[ DECRED_NBITS_INDEX ];
-   uint32_t bits = ( nbits & 0xffffff );
-   int16_t shift = ( swab32(nbits) & 0xff ); // 0x1c = 28
-   int m;
-   long double d = (long double)0x0000ffff / (long double)bits;
-
-   for ( m = shift; m < 29; m++ )
-       d *= 256.0;
-   for ( m = 29; m < shift; m++ )
-       d /= 256.0;
-   if ( shift == 28 )
-       d *= 256.0; // testnet
-   if ( opt_debug_diff )
-       applog( LOG_DEBUG, "net diff: %f -> shift %u, bits %08x", (double)d,
-                           shift, bits );
-   return net_diff;
-}
-
-void decred_decode_extradata( struct work* work, uint64_t* net_blocks )
-{
-   // some random extradata to make the work unique
-   work->data[ DECRED_XNONCE_INDEX ] = (rand()*4);
-   work->height = work->data[32];
-   if (!have_longpoll && work->height > *net_blocks + 1)
-   {
-      char netinfo[64] = { 0 };
-      if ( net_diff > 0. )
-      {
-         if (net_diff != work->targetdiff)
-            sprintf(netinfo, ", diff %.3f, target %.1f", net_diff,
-                   work->targetdiff);
-         else
-             sprintf(netinfo, ", diff %.3f", net_diff);
-       }
-       applog(LOG_BLUE, "%s block %d%s", algo_names[opt_algo], work->height,
-                       netinfo);
-       *net_blocks = work->height - 1;
-   }
-}
-
-void decred_be_build_stratum_request( char *req, struct work *work,
-                                      struct stratum_ctx *sctx )
-{
-   unsigned char *xnonce2str;
-   uint32_t ntime, nonce;
-   char ntimestr[9], noncestr[9];
-
-   be32enc( &ntime, work->data[ DECRED_NTIME_INDEX ] );
-   be32enc( &nonce, work->data[ DECRED_NONCE_INDEX ] );
-   bin2hex( ntimestr, (char*)(&ntime), sizeof(uint32_t) );
-   bin2hex( noncestr, (char*)(&nonce), sizeof(uint32_t) );
-   xnonce2str = abin2hex( (char*)( &work->data[ DECRED_XNONCE_INDEX ] ),
-                                     sctx->xnonce1_size );
-   snprintf( req, JSON_BUF_LEN,
-        "{\"method\": \"mining.submit\", \"params\": [\"%s\", \"%s\", \"%s\", \"%s\", \"%s\"], \"id\":4}",
-         rpc_user, work->job_id, xnonce2str, ntimestr, noncestr );
-   free(xnonce2str);
-}
-
-#if !defined(min)
-#define min(a,b) (a>b ? (b) :(a))
-#endif
-
-void decred_build_extraheader( struct work* g_work, struct stratum_ctx* sctx )
-{
-   uchar merkle_root[64] = { 0 };
-   uint32_t extraheader[32] = { 0 };
-   int headersize = 0;
-   uint32_t* extradata = (uint32_t*) sctx->xnonce1;
-   int i;
-
-   // getwork over stratum, getwork merkle + header passed in coinb1
-   memcpy(merkle_root, sctx->job.coinbase, 32);
-   headersize = min((int)sctx->job.coinbase_size - 32,
-                  sizeof(extraheader) );
-   memcpy( extraheader, &sctx->job.coinbase[32], headersize );
-
-   // Assemble block header 
-   memset( g_work->data, 0, sizeof(g_work->data) );
-   g_work->data[0] = le32dec( sctx->job.version );
-   for ( i = 0; i < 8; i++ )
-      g_work->data[1 + i] = swab32(
-                              le32dec( (uint32_t *) sctx->job.prevhash + i ) );
-   for ( i = 0; i < 8; i++ )
-      g_work->data[9 + i] = swab32( be32dec( (uint32_t *) merkle_root + i ) );
-
-//   for ( i = 0; i < 8; i++ ) // prevhash
-//      g_work->data[1 + i] = swab32( g_work->data[1 + i] );
-//   for ( i = 0; i < 8; i++ ) // merkle
-//      g_work->data[9 + i] = swab32( g_work->data[9 + i] );
-
-   for ( i = 0; i < headersize/4; i++ ) // header
-      g_work->data[17 + i] = extraheader[i];
-   // extradata
-
-   for ( i = 0; i < sctx->xnonce1_size/4; i++ )
-      g_work->data[ DECRED_XNONCE_INDEX + i ] = extradata[i];
-   for ( i = DECRED_XNONCE_INDEX + sctx->xnonce1_size/4; i < 45; i++ )
-      g_work->data[i] = 0;
-   g_work->data[37] = (rand()*4) << 8;
-   // block header suffix from coinb2 (stake version)
-   memcpy( &g_work->data[44],
-           &sctx->job.coinbase[ sctx->job.coinbase_size-4 ], 4 );
-   sctx->block_height = g_work->data[32];
-   //applog_hex(work->data, 180);
-   //applog_hex(&work->data[36], 36);
-}
-
-#undef min
-
-bool decred_ready_to_mine( struct work* work, struct stratum_ctx* stratum,
-                           int thr_id )
-{
-   if ( have_stratum && strcmp(stratum->job.job_id, work->job_id)  )
-      // need to regen g_work..
-      return false;
-   if ( have_stratum && !work->data[0] && !opt_benchmark )
-   {
-      sleep(1);
-      return false;
-   }
-   // extradata: prevent duplicates
-   work->data[ DECRED_XNONCE_INDEX     ] += 1;
-   work->data[ DECRED_XNONCE_INDEX + 1 ] |= thr_id;
-   return true;
-}
-
-int decred_get_work_data_size() { return DECRED_DATA_SIZE; }
-
-bool register_decred_algo( algo_gate_t* gate )
-{
-#if defined(DECRED_4WAY)
-  four_way_not_tested();
-  gate->scanhash  = (void*)&scanhash_decred_4way;
-  gate->hash      = (void*)&decred_hash_4way;
-#else
-  gate->scanhash  = (void*)&scanhash_decred;
-  gate->hash      = (void*)&decred_hash;
-#endif
-  gate->optimizations = AVX2_OPT;
-//  gate->get_nonceptr          = (void*)&decred_get_nonceptr;
-  gate->decode_extra_data     = (void*)&decred_decode_extradata;
-  gate->build_stratum_request = (void*)&decred_be_build_stratum_request;
-  gate->work_decode           = (void*)&std_be_work_decode;
-  gate->submit_getwork_result = (void*)&std_be_submit_getwork_result;
-  gate->build_extraheader     = (void*)&decred_build_extraheader;
-  gate->ready_to_mine         = (void*)&decred_ready_to_mine;
-  gate->nbits_index           = DECRED_NBITS_INDEX;
-  gate->ntime_index           = DECRED_NTIME_INDEX;
-  gate->nonce_index           = DECRED_NONCE_INDEX;
-  gate->get_work_data_size    = (void*)&decred_get_work_data_size;
-  gate->work_cmp_size         = DECRED_WORK_COMPARE_SIZE;
-  allow_mininginfo            = false;
-  have_gbt                    = false;
-  return true;
-}
-
diff --git a/algo/blake/decred-gate.h b/algo/blake/decred-gate.h
deleted file mode 100644
index 3910b50..0000000
--- a/algo/blake/decred-gate.h
+++ /dev/null
@@ -1,36 +0,0 @@
-#ifndef __DECRED_GATE_H__
-#define __DECRED_GATE_H__
-
-#include "algo-gate-api.h"
-#include <stdint.h>
-
-#define DECRED_NBITS_INDEX 29
-#define DECRED_NTIME_INDEX 34
-#define DECRED_NONCE_INDEX 35
-#define DECRED_XNONCE_INDEX 36
-#define DECRED_DATA_SIZE 192
-#define DECRED_WORK_COMPARE_SIZE 140
-#define DECRED_MIDSTATE_LEN 128
-
-#if defined (__AVX2__) 
-//void blakehash_84way(void *state, const void *input);
-//int scanhash_blake_8way( struct work *work, uint32_t max_nonce,
-//                         uint64_t *hashes_done );
-#endif
-
-#if defined(__SSE4_2__)
-  #define DECRED_4WAY
-#endif
-
-#if defined (DECRED_4WAY)
-void decred_hash_4way(void *state, const void *input);
-int scanhash_decred_4way( struct work *work, uint32_t max_nonce,
-                          uint64_t *hashes_done, struct thr_info *mythr );
-#endif
-
-void decred_hash( void *state, const void *input );
-int scanhash_decred( struct work *work, uint32_t max_nonce,
-                     uint64_t *hashes_done, struct thr_info *mythr );
-
-#endif
-
diff --git a/algo/blake/decred.c b/algo/blake/decred.c
deleted file mode 100644
index d60b32b..0000000
--- a/algo/blake/decred.c
+++ /dev/null
@@ -1,282 +0,0 @@
-#include "decred-gate.h"
-
-#if !defined(DECRED_8WAY) && !defined(DECRED_4WAY)
-
-#include "sph_blake.h"
-
-#include <string.h>
-#include <stdint.h>
-#include <memory.h>
-#include <unistd.h>
-
-/*
-#ifndef min
-#define min(a,b) (a>b ? b : a)
-#endif
-#ifndef max 
-#define max(a,b) (a<b ? b : a)
-#endif
-*/
-/*
-#define DECRED_NBITS_INDEX 29
-#define DECRED_NTIME_INDEX 34
-#define DECRED_NONCE_INDEX 35
-#define DECRED_XNONCE_INDEX 36
-#define DECRED_DATA_SIZE 192
-#define DECRED_WORK_COMPARE_SIZE 140
-*/
-static __thread sph_blake256_context blake_mid;
-static __thread bool ctx_midstate_done = false;
-
-void decred_hash(void *state, const void *input)
-{
-//        #define MIDSTATE_LEN 128
-        sph_blake256_context ctx __attribute__ ((aligned (64)));
-
-        uint8_t *ending = (uint8_t*) input;
-        ending += DECRED_MIDSTATE_LEN;
-
-        if (!ctx_midstate_done) {
-                sph_blake256_init(&blake_mid);
-                sph_blake256(&blake_mid, input, DECRED_MIDSTATE_LEN);
-                ctx_midstate_done = true;
-        }
-        memcpy(&ctx, &blake_mid, sizeof(blake_mid));
-
-        sph_blake256(&ctx, ending, (180 - DECRED_MIDSTATE_LEN));
-        sph_blake256_close(&ctx, state);
-}
-
-void decred_hash_simple(void *state, const void *input)
-{
-        sph_blake256_context ctx;
-        sph_blake256_init(&ctx);
-        sph_blake256(&ctx, input, 180);
-        sph_blake256_close(&ctx, state);
-}
-
-int scanhash_decred( struct work *work, uint32_t max_nonce,
-               uint64_t *hashes_done, struct thr_info *mythr )
-{
-        uint32_t _ALIGN(64) endiandata[48];
-        uint32_t _ALIGN(64) hash32[8];
-        uint32_t *pdata = work->data;
-        uint32_t *ptarget = work->target;
-   int thr_id = mythr->id;  // thr_id arg is deprecated
-
-//        #define DCR_NONCE_OFT32 35
-
-        const uint32_t first_nonce = pdata[DECRED_NONCE_INDEX];
-        const uint32_t HTarget = opt_benchmark ? 0x7f : ptarget[7];
-
-        uint32_t n = first_nonce;
-
-        ctx_midstate_done = false;
-
-#if 1
-        memcpy(endiandata, pdata, 180);
-#else
-        for (int k=0; k < (180/4); k++)
-                be32enc(&endiandata[k], pdata[k]);
-#endif
-
-        do {
-                //be32enc(&endiandata[DCR_NONCE_OFT32], n);
-                endiandata[DECRED_NONCE_INDEX] = n;
-                decred_hash(hash32, endiandata);
-
-                if (hash32[7] <= HTarget && fulltest(hash32, ptarget))
-                {
-                   pdata[DECRED_NONCE_INDEX] = n;
-                   submit_solution( work, hash32, mythr );
-                }
-
-                n++;
-
-        } while (n < max_nonce && !work_restart[thr_id].restart);
-
-        *hashes_done = n - first_nonce + 1;
-        pdata[DECRED_NONCE_INDEX] = n;
-        return 0;
-}
-
-/*
-uint32_t *decred_get_nonceptr( uint32_t *work_data )
-{
-   return &work_data[ DECRED_NONCE_INDEX ];
-}
-
-double decred_calc_network_diff( struct work* work )
-{
-   // sample for diff 43.281 : 1c05ea29
-   // todo: endian reversed on longpoll could be zr5 specific...
-   uint32_t nbits = work->data[ DECRED_NBITS_INDEX ];
-   uint32_t bits = ( nbits & 0xffffff );
-   int16_t shift = ( swab32(nbits) & 0xff ); // 0x1c = 28
-   int m;
-   double d = (double)0x0000ffff / (double)bits;
-
-   for ( m = shift; m < 29; m++ )
-       d *= 256.0;
-   for ( m = 29; m < shift; m++ )
-       d /= 256.0;
-   if ( shift == 28 )
-       d *= 256.0; // testnet
-   if ( opt_debug_diff )
-       applog( LOG_DEBUG, "net diff: %f -> shift %u, bits %08x", d,
-                           shift, bits );
-   return net_diff;
-}
-
-void decred_decode_extradata( struct work* work, uint64_t* net_blocks )
-{
-   // some random extradata to make the work unique
-   work->data[ DECRED_XNONCE_INDEX ] = (rand()*4);
-   work->height = work->data[32];
-   if (!have_longpoll && work->height > *net_blocks + 1)
-   {
-      char netinfo[64] = { 0 };
-      if (net_diff > 0.)
-      {
-         if (net_diff != work->targetdiff)
-	    sprintf(netinfo, ", diff %.3f, target %.1f", net_diff,
-                   work->targetdiff);
-	 else
-	     sprintf(netinfo, ", diff %.3f", net_diff);
-       }
-       applog(LOG_BLUE, "%s block %d%s", algo_names[opt_algo], work->height,
-                       netinfo);
-       *net_blocks = work->height - 1;
-   }
-}
-
-void decred_be_build_stratum_request( char *req, struct work *work,
-                                      struct stratum_ctx *sctx )
-{
-   unsigned char *xnonce2str;
-   uint32_t ntime, nonce;
-   char ntimestr[9], noncestr[9];
-
-   be32enc( &ntime, work->data[ DECRED_NTIME_INDEX ] );
-   be32enc( &nonce, work->data[ DECRED_NONCE_INDEX ] );
-   bin2hex( ntimestr, (char*)(&ntime), sizeof(uint32_t) );
-   bin2hex( noncestr, (char*)(&nonce), sizeof(uint32_t) );
-   xnonce2str = abin2hex( (char*)( &work->data[ DECRED_XNONCE_INDEX ] ),
-                                     sctx->xnonce1_size );
-   snprintf( req, JSON_BUF_LEN,
-        "{\"method\": \"mining.submit\", \"params\": [\"%s\", \"%s\", \"%s\", \"%s\", \"%s\"], \"id\":4}",
-         rpc_user, work->job_id, xnonce2str, ntimestr, noncestr );
-   free(xnonce2str);
-}
-*/
-/*
-// data shared between gen_merkle_root and build_extraheader.
-__thread uint32_t decred_extraheader[32] = { 0 };
-__thread int decred_headersize = 0;
-
-void decred_gen_merkle_root( char* merkle_root, struct stratum_ctx* sctx )
-{
-   // getwork over stratum, getwork merkle + header passed in coinb1
-   memcpy(merkle_root, sctx->job.coinbase, 32);
-   decred_headersize = min((int)sctx->job.coinbase_size - 32, 
-                  sizeof(decred_extraheader) );
-   memcpy( decred_extraheader, &sctx->job.coinbase[32], decred_headersize);
-}
-*/
-
-/*
-#define min(a,b) (a>b ? (b) :(a))
-
-void decred_build_extraheader( struct work* g_work, struct stratum_ctx* sctx )
-{
-   uchar merkle_root[64] = { 0 };
-   uint32_t extraheader[32] = { 0 };
-   int headersize = 0;
-   uint32_t* extradata = (uint32_t*) sctx->xnonce1;
-   size_t t;
-   int i;
-
-   // getwork over stratum, getwork merkle + header passed in coinb1
-   memcpy(merkle_root, sctx->job.coinbase, 32);
-   headersize = min((int)sctx->job.coinbase_size - 32,
-                  sizeof(extraheader) );
-   memcpy( extraheader, &sctx->job.coinbase[32], headersize );
-
-   // Increment extranonce2 
-   for ( t = 0; t < sctx->xnonce2_size && !( ++sctx->job.xnonce2[t] ); t++ );
-
-   // Assemble block header 
-   memset( g_work->data, 0, sizeof(g_work->data) );
-   g_work->data[0] = le32dec( sctx->job.version );
-   for ( i = 0; i < 8; i++ )
-      g_work->data[1 + i] = swab32(
-                              le32dec( (uint32_t *) sctx->job.prevhash + i ) );
-   for ( i = 0; i < 8; i++ )
-      g_work->data[9 + i] = swab32( be32dec( (uint32_t *) merkle_root + i ) );
-
-//   for ( i = 0; i < 8; i++ ) // prevhash
-//      g_work->data[1 + i] = swab32( g_work->data[1 + i] );
-//   for ( i = 0; i < 8; i++ ) // merkle
-//      g_work->data[9 + i] = swab32( g_work->data[9 + i] );
-
-   for ( i = 0; i < headersize/4; i++ ) // header
-      g_work->data[17 + i] = extraheader[i];
-   // extradata
-
-   for ( i = 0; i < sctx->xnonce1_size/4; i++ )
-      g_work->data[ DECRED_XNONCE_INDEX + i ] = extradata[i];
-   for ( i = DECRED_XNONCE_INDEX + sctx->xnonce1_size/4; i < 45; i++ )
-      g_work->data[i] = 0;
-   g_work->data[37] = (rand()*4) << 8;
-   // block header suffix from coinb2 (stake version)
-   memcpy( &g_work->data[44],
-           &sctx->job.coinbase[ sctx->job.coinbase_size-4 ], 4 );
-   sctx->bloc_height = g_work->data[32];
-   //applog_hex(work->data, 180);
-   //applog_hex(&work->data[36], 36);
-}
-
-#undef min
-
-bool decred_ready_to_mine( struct work* work, struct stratum_ctx* stratum,
-                           int thr_id )
-{
-   if ( have_stratum && strcmp(stratum->job.job_id, work->job_id)  )
-      // need to regen g_work..
-      return false;
-   if ( have_stratum && !work->data[0] && !opt_benchmark )
-   {
-      sleep(1);
-      return false;
-   }      
-   // extradata: prevent duplicates
-   work->data[ DECRED_XNONCE_INDEX     ] += 1;
-   work->data[ DECRED_XNONCE_INDEX + 1 ] |= thr_id;
-   return true;
-}
-
-
-bool register_decred_algo( algo_gate_t* gate )
-{
-  gate->optimizations         = SSE2_OPT;
-  gate->scanhash              = (void*)&scanhash_decred;
-  gate->hash                  = (void*)&decred_hash;
-  gate->get_nonceptr          = (void*)&decred_get_nonceptr;
-  gate->decode_extra_data     = (void*)&decred_decode_extradata;
-  gate->build_stratum_request = (void*)&decred_be_build_stratum_request;
-  gate->work_decode           = (void*)&std_be_work_decode;
-  gate->submit_getwork_result = (void*)&std_be_submit_getwork_result;
-  gate->build_extraheader     = (void*)&decred_build_extraheader;
-  gate->ready_to_mine         = (void*)&decred_ready_to_mine;
-  gate->nbits_index           = DECRED_NBITS_INDEX;
-  gate->ntime_index           = DECRED_NTIME_INDEX;
-  gate->nonce_index           = DECRED_NONCE_INDEX;
-  gate->work_data_size        = DECRED_DATA_SIZE;
-  gate->work_cmp_size         = DECRED_WORK_COMPARE_SIZE; 
-  allow_mininginfo            = false;
-  have_gbt                    = false;
-  return true;
-}
-*/
-
-#endif
diff --git a/algo/ripemd/lbry-gate.c b/algo/ripemd/lbry-gate.c
index d962f50..bb67b81 100644
--- a/algo/ripemd/lbry-gate.c
+++ b/algo/ripemd/lbry-gate.c
@@ -4,24 +4,6 @@
 #include <string.h>
 #include <stdio.h>
 
-long double lbry_calc_network_diff( struct work *work )
-{
-        // sample for diff 43.281 : 1c05ea29
-        // todo: endian reversed on longpoll could be zr5 specific...
-
-   uint32_t nbits = swab32( work->data[ LBRY_NBITS_INDEX ] );
-   uint32_t bits = (nbits & 0xffffff);
-   int16_t shift = (swab32(nbits) & 0xff); // 0x1c = 28
-   long double d = (long double)0x0000ffff / (long double)bits;
-
-   for (int m=shift; m < 29; m++) d *= 256.0;
-   for (int m=29; m < shift; m++) d /= 256.0;
-   if (opt_debug_diff)
-      applog(LOG_DEBUG, "net diff: %f -> shift %u, bits %08x", d, shift, bits);
-
-   return d;
-}
-
 // std_le should work but it doesn't
 void lbry_le_build_stratum_request( char *req, struct work *work,
                                       struct stratum_ctx *sctx )
@@ -41,31 +23,6 @@ void lbry_le_build_stratum_request( char *req, struct work *work,
    free(xnonce2str);
 }
 
-/*
-void lbry_build_block_header( struct work* g_work, uint32_t version,
-                             uint32_t *prevhash, uint32_t *merkle_root,
-                             uint32_t ntime, uint32_t nbits )
-{
-   int i;
-   memset( g_work->data, 0, sizeof(g_work->data) );
-   g_work->data[0] =  version;
-
-   if ( have_stratum )
-      for ( i = 0; i < 8; i++ )
-         g_work->data[1 + i] = le32dec( prevhash + i );
-   else
-      for (i = 0; i < 8; i++)
-         g_work->data[ 8-i ] = le32dec( prevhash + i );
-
-   for ( i = 0; i < 8; i++ )
-      g_work->data[9 + i] = be32dec( merkle_root + i );
-
-   g_work->data[ LBRY_NTIME_INDEX ] = ntime;
-   g_work->data[ LBRY_NBITS_INDEX ] = nbits;
-   g_work->data[28] = 0x80000000;
-}
-*/
-
 void lbry_build_extraheader( struct work* g_work, struct stratum_ctx* sctx )
 {
    unsigned char merkle_root[64] = { 0 };
@@ -112,9 +69,7 @@ bool register_lbry_algo( algo_gate_t* gate )
   gate->hash                  = (void*)&lbry_hash;
   gate->optimizations = AVX2_OPT | AVX512_OPT | SHA_OPT;
 #endif
-  gate->calc_network_diff     = (void*)&lbry_calc_network_diff;
   gate->build_stratum_request = (void*)&lbry_le_build_stratum_request;
-//  gate->build_block_header    = (void*)&build_block_header;
   gate->build_extraheader     = (void*)&lbry_build_extraheader;
   gate->ntime_index           = LBRY_NTIME_INDEX;
   gate->nbits_index           = LBRY_NBITS_INDEX;
diff --git a/algo/x17/x17-4way.c b/algo/x17/x17-4way.c
index 95a7d63..5c44a18 100644
--- a/algo/x17/x17-4way.c
+++ b/algo/x17/x17-4way.c
@@ -257,6 +257,7 @@ int scanhash_x17_8way( struct work *work, uint32_t max_nonce,
    const __m512i eight = m512_const1_64( 8 );
    const bool bench = opt_benchmark;
 
+   // convert LE32 to LE64
    edata[0] = mm128_swap64_32( casti_m128i( pdata, 0 ) );
    edata[1] = mm128_swap64_32( casti_m128i( pdata, 1 ) );
    edata[2] = mm128_swap64_32( casti_m128i( pdata, 2 ) );
@@ -470,6 +471,7 @@ int scanhash_x17_4way( struct work *work, uint32_t max_nonce,
    const __m256i four = m256_const1_64( 4 );
    const bool bench = opt_benchmark;
 
+   // convert LE32 to LE64
    edata[0] = mm128_swap64_32( casti_m128i( pdata, 0 ) );
    edata[1] = mm128_swap64_32( casti_m128i( pdata, 1 ) );
    edata[2] = mm128_swap64_32( casti_m128i( pdata, 2 ) );
diff --git a/configure b/configure
index 35b1619..31de0b4 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.71 for cpuminer-opt 3.21.5.
+# Generated by GNU Autoconf 2.71 for cpuminer-opt 3.22.0.
 #
 #
 # Copyright (C) 1992-1996, 1998-2017, 2020-2021 Free Software Foundation,
@@ -608,8 +608,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='cpuminer-opt'
 PACKAGE_TARNAME='cpuminer-opt'
-PACKAGE_VERSION='3.21.5'
-PACKAGE_STRING='cpuminer-opt 3.21.5'
+PACKAGE_VERSION='3.22.0'
+PACKAGE_STRING='cpuminer-opt 3.22.0'
 PACKAGE_BUGREPORT=''
 PACKAGE_URL=''
 
@@ -1360,7 +1360,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures cpuminer-opt 3.21.5 to adapt to many kinds of systems.
+\`configure' configures cpuminer-opt 3.22.0 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1432,7 +1432,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of cpuminer-opt 3.21.5:";;
+     short | recursive ) echo "Configuration of cpuminer-opt 3.22.0:";;
    esac
   cat <<\_ACEOF
 
@@ -1538,7 +1538,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-cpuminer-opt configure 3.21.5
+cpuminer-opt configure 3.22.0
 generated by GNU Autoconf 2.71
 
 Copyright (C) 2021 Free Software Foundation, Inc.
@@ -1985,7 +1985,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by cpuminer-opt $as_me 3.21.5, which was
+It was created by cpuminer-opt $as_me 3.22.0, which was
 generated by GNU Autoconf 2.71.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -3593,7 +3593,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='cpuminer-opt'
- VERSION='3.21.5'
+ VERSION='3.22.0'
 
 
 printf "%s\n" "#define PACKAGE \"$PACKAGE\"" >>confdefs.h
@@ -7508,7 +7508,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by cpuminer-opt $as_me 3.21.5, which was
+This file was extended by cpuminer-opt $as_me 3.22.0, which was
 generated by GNU Autoconf 2.71.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -7576,7 +7576,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-cpuminer-opt config.status 3.21.5
+cpuminer-opt config.status 3.22.0
 configured by $0, generated by GNU Autoconf 2.71,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index dfdb0ff..1e79cf9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([cpuminer-opt], [3.21.5])
+AC_INIT([cpuminer-opt], [3.22.0])
 
 AC_PREREQ([2.59c])
 AC_CANONICAL_SYSTEM
diff --git a/cpu-miner.c b/cpu-miner.c
index 5311a6c..e2ba90c 100644
--- a/cpu-miner.c
+++ b/cpu-miner.c
@@ -432,20 +432,18 @@ static bool work_decode( const json_t *val, struct work *work )
     if ( unlikely( !algo_gate.work_decode( work ) ) )
         return false;
 
-    if ( !allow_mininginfo )
-        net_diff = algo_gate.calc_network_diff( work );
-    else
-        net_diff = hash_to_diff( work->target );
-
-    work->targetdiff = net_diff;
-    stratum_diff = last_targetdiff = work->targetdiff;
+    // many of these aren't used solo.
+    net_diff =
+    work->targetdiff = 
+    stratum_diff =
+    last_targetdiff = hash_to_diff( work->target );
     work->sharediff = 0;
     algo_gate.decode_extra_data( work, &net_blocks );
 
     return true;
 }
 
-// good alternative for wallet mining, difficulty and net hashrate
+// Only used for net_hashrate with GBT/getwork, data is from previous block.
 static const char *info_req =
 "{\"method\": \"getmininginfo\", \"params\": [], \"id\":8}\r\n";
 
@@ -471,17 +469,14 @@ static bool get_mininginfo( CURL *curl, struct work *work )
    // "networkhashps": 56475980
    if ( res )
    {
-      // net_diff is a global that is set from the work hash target by
-      // both getwork and GBT. Don't overwrite it, define a local to override
-      // the global.
-      double net_diff = 0.;
+      double difficulty = 0.;
   		json_t *key = json_object_get( res, "difficulty" );
    	if ( key )
       {
 	   	if ( json_is_object( key ) )
 		   	key = json_object_get( key, "proof-of-work" );
 		   if ( json_is_real( key ) )
-			   net_diff = json_real_value( key );
+			   difficulty = json_real_value( key );
 	   }
 
       key = json_object_get( res, "networkhashps" );
@@ -498,12 +493,13 @@ static bool get_mininginfo( CURL *curl, struct work *work )
 		  	net_blocks = json_integer_value( key );
 
       if ( opt_debug )
-         applog(LOG_INFO,"Mining info: diff %.5g, net_hashrate %f, height %d",
-                              net_diff, net_hashrate, net_blocks );
-      
+         applog( LOG_INFO,"getmininginfo: difficulty %.5g, networkhashps %.5g, blocks %d", difficulty, net_hashrate, net_blocks );
+
       if ( !work->height )
       {
 	      // complete missing data from getwork
+         if ( opt_debug )
+            applog( LOG_DEBUG, "work height set by getmininginfo" );
 	      work->height = (uint32_t) net_blocks + 1;
 	      if ( work->height > g_work.height )
             restart_threads();
@@ -535,9 +531,8 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
    json_t *tmp, *txa;
    bool rc = false;
    int i, n;
-
-// Segwit BEGIN
    bool segwit = false;
+
    tmp = json_object_get( val, "rules" );
    if ( tmp && json_is_array( tmp ) )
    {
@@ -555,8 +550,7 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
          }
       }
    }
-// Segwit END
-   
+
    tmp = json_object_get( val, "mutable" );
    if ( tmp && json_is_array( tmp ) )
    {
@@ -638,7 +632,7 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
          goto out;
       }
    }
-   
+
    /* find count and size of transactions */
    txa = json_object_get(val, "transactions" );
    if ( !txa || !json_is_array( txa ) )
@@ -713,12 +707,7 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
       cbtx[41] = cbtx_size - 42; /* scriptsig length */
       le32enc( (uint32_t *)( cbtx+cbtx_size ), 0xffffffff ); /* sequence */
       cbtx_size += 4;
-
-// Segwit BEGIN
-      //cbtx[cbtx_size++] = 1; /* out-counter */
-        cbtx[cbtx_size++] = segwit ? 2 : 1; /* out-counter */
-// Segwit END
-
+      cbtx[cbtx_size++] = segwit ? 2 : 1; /* out-counter */
       le32enc( (uint32_t *)( cbtx+cbtx_size) , (uint32_t)cbvalue ); /* value */
       le32enc( (uint32_t *)( cbtx+cbtx_size+4 ), cbvalue >> 32 );
       cbtx_size += 8;
@@ -726,7 +715,6 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
       memcpy( cbtx+cbtx_size, pk_script, pk_script_size );
       cbtx_size += (int) pk_script_size;
 
-// Segwit BEGIN
        if ( segwit )
        {
           unsigned char (*wtree)[32] = calloc(tx_count + 2, 32);
@@ -761,12 +749,11 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
             for ( i = 0; i < n; i++ )
                sha256d( wtree[i], wtree[2*i], 64 );
          }
-         memset( wtree[1], 0, 32 );  /* witness reserved value = 0 */
+         memset( wtree[1], 0, 32 );  // witness reserved value = 0
          sha256d( cbtx+cbtx_size, wtree[0], 64 );
          cbtx_size += 32;
          free( wtree );
       }
-// Segwit END
 
       le32enc( (uint32_t *)( cbtx+cbtx_size ), 0 ); /* lock time */
       cbtx_size += 4;
@@ -785,10 +772,8 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
             xsig_len += n;
          }
          else
-         {
             applog( LOG_WARNING,
                         "Signature does not fit in coinbase, skipping" );
-         }
       }
       tmp = json_object_get( val, "coinbaseaux" );
       if ( tmp && json_is_object( tmp ) )
@@ -815,8 +800,8 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
       if ( xsig_len )
       {
          unsigned char *ssig_end = cbtx + 42 + cbtx[41];
-         int push_len = cbtx[41] + xsig_len < 76 ? 1 :
-		               cbtx[41] + 2 + xsig_len > 100 ? 0 : 2;
+         int push_len = cbtx[41] + xsig_len < 76
+                        ? 1 : cbtx[41] + 2 + xsig_len > 100 ? 0 : 2;
          n = xsig_len + push_len;
          memmove( ssig_end + n, ssig_end, cbtx_size - 42 - cbtx[41] );
          cbtx[41] += n;
@@ -843,7 +828,6 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
       const char *tx_hex = json_string_value( json_object_get( tmp, "data" ) );
       const int tx_size = tx_hex ? (int) ( strlen( tx_hex ) / 2 ) : 0;
 
-// Segwit BEGIN      
       if ( segwit )
       {
          const char *txid = json_string_value( json_object_get( tmp, "txid" ) );
@@ -856,8 +840,6 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
       }
       else
       {
-// Segwit END
-
          unsigned char *tx = (uchar*) malloc( tx_size );
          if ( !tx_hex || !hex2bin( tx, tx_hex, tx_size ) )
          {
@@ -867,10 +849,7 @@ static bool gbt_work_decode( const json_t *val, struct work *work )
          }
          sha256d( merkle_tree[1 + i], tx, tx_size );
          free( tx );
-
-// Segwit BEGIN      
       }
-// Segwit END
 
       if ( !submit_coinbase )
          strcat( work->txs, tx_hex );
@@ -1080,12 +1059,11 @@ void report_summary_log( bool force )
    timeval_subtract( &et, &now, &start_time );
    timeval_subtract( &uptime, &total_hashes_time, &session_start );
    
-   double share_time = (double)et.tv_sec + (double)et.tv_usec / 1e6;
+   double share_time = (double)et.tv_sec + (double)et.tv_usec * 1e-6;
    double ghrate = safe_div( total_hashes, (double)uptime.tv_sec, 0. );
    double target_diff = exp32 * last_targetdiff;
    double shrate = safe_div( target_diff * (double)(accepts),
                              share_time, 0. );
-//   global_hashrate = ghrate;
    double sess_hrate = safe_div( exp32 * norm_diff_sum,
                                  (double)uptime.tv_sec, 0. );
    double submit_rate = safe_div( (double)submits * 60., share_time, 0. );
@@ -1106,7 +1084,7 @@ void report_summary_log( bool force )
    applog2( LOG_NOTICE, "Periodic Report     %s        %s", et_str, upt_str );
    applog2( LOG_INFO, "Share rate        %.2f/min     %.2f/min",
             submit_rate, safe_div( (double)submitted_share_count*60.,
-              ( (double)uptime.tv_sec + (double)uptime.tv_usec / 1e6 ), 0. ) );
+              ( (double)uptime.tv_sec + (double)uptime.tv_usec * 1e-6 ), 0. ) );
    applog2( LOG_INFO, "Hash rate       %7.2f%sh/s   %7.2f%sh/s   (%.2f%sh/s)",
             shrate, shr_units, sess_hrate, sess_hr_units, ghrate, ghr_units );
 
@@ -1553,7 +1531,6 @@ const char *getwork_req =
 
 #define GBT_CAPABILITIES "[\"coinbasetxn\", \"coinbasevalue\", \"longpoll\", \"workid\"]"
 
-// Segwit BEGIN
 #define GBT_RULES "[\"segwit\"]"
 static const char *gbt_req =
    "{\"method\": \"getblocktemplate\", \"params\": [{\"capabilities\": "
@@ -1562,16 +1539,6 @@ const char *gbt_lp_req =
    "{\"method\": \"getblocktemplate\", \"params\": [{\"capabilities\": "
    GBT_CAPABILITIES ", \"rules\": " GBT_RULES ", \"longpollid\": \"%s\"}], \"id\":0}\r\n";
 
-/*
-static const char *gbt_req =
-	"{\"method\": \"getblocktemplate\", \"params\": [{\"capabilities\": "
-	GBT_CAPABILITIES "}], \"id\":0}\r\n";
-const char *gbt_lp_req =
-	"{\"method\": \"getblocktemplate\", \"params\": [{\"capabilities\": "
-	GBT_CAPABILITIES ", \"longpollid\": \"%s\"}], \"id\":0}\r\n";
-*/
-// Segwit END
-
 static bool get_upstream_work( CURL *curl, struct work *work )
 {
    json_t *val;
@@ -1649,46 +1616,46 @@ start:
          applog( LOG_BLUE, "New Block %d, Net Diff %.5g, Ntime %08x",
                                 work->height, net_diff,
                                 work->data[ algo_gate.ntime_index ] );
-
-         if ( !opt_quiet )
-         {
-            double miner_hr = 0.;
-            double net_hr = net_hashrate;
-            double nd = net_diff * exp32;
-            char net_hr_units[4] = {0};
-            char miner_hr_units[4] = {0};
-            char net_ttf[32];
-            char miner_ttf[32];
-
-            pthread_mutex_lock( &stats_lock );
-
-            for ( int i = 0; i < opt_n_threads; i++ )
-               miner_hr += thr_hashrates[i];
-            global_hashrate = miner_hr;
-
-            pthread_mutex_unlock( &stats_lock );
-
-            if ( net_hr > 0. )
-               sprintf_et( net_ttf, nd / net_hr );
-            else
-               sprintf( net_ttf, "NA" );
-            if ( miner_hr > 0. )
-               sprintf_et( miner_ttf, nd / miner_hr );
-            else
-               sprintf( miner_ttf, "NA" );
-
-            scale_hash_for_display ( &miner_hr, miner_hr_units );
-            scale_hash_for_display ( &net_hr, net_hr_units );
-            applog2( LOG_INFO,
-                     "Miner TTF @ %.2f %sh/s %s, Net TTF @ %.2f %sh/s %s",
-                     miner_hr, miner_hr_units, miner_ttf, net_hr,
-                     net_hr_units, net_ttf );
-         }
-      }  // work->height > last_block_height
+      }
       else if ( memcmp( &work->data[1], &g_work.data[1], 32 ) )
          applog( LOG_BLUE, "New Work: Block %d, Net Diff %.5g, Ntime %08x",
-                                      work->height, net_diff,
+                                     work->height, net_diff,
                                       work->data[ algo_gate.ntime_index ] );
+       
+      if ( !opt_quiet )
+      {
+         double miner_hr = 0.;
+         double net_hr = net_hashrate;
+         double nd = net_diff * exp32;
+         char net_hr_units[4] = {0};
+         char miner_hr_units[4] = {0};
+         char net_ttf[32];
+         char miner_ttf[32];
+
+         pthread_mutex_lock( &stats_lock );
+
+         for ( int i = 0; i < opt_n_threads; i++ )
+             miner_hr += thr_hashrates[i];
+         global_hashrate = miner_hr;
+
+         pthread_mutex_unlock( &stats_lock );
+
+         if ( net_hr > 0. )
+            sprintf_et( net_ttf, nd / net_hr );
+         else
+            sprintf( net_ttf, "NA" );
+         if ( miner_hr > 0. )
+            sprintf_et( miner_ttf, nd / miner_hr );
+         else
+            sprintf( miner_ttf, "NA" );
+
+         scale_hash_for_display ( &miner_hr, miner_hr_units );
+         scale_hash_for_display ( &net_hr, net_hr_units );
+         applog2( LOG_INFO,
+                  "Miner TTF @ %.2f %sh/s %s, Net TTF @ %.2f %sh/s %s",
+                  miner_hr, miner_hr_units, miner_ttf, net_hr,
+                  net_hr_units, net_ttf );
+      }
    }  // rc
 
    return rc;
@@ -1898,9 +1865,9 @@ static void update_submit_stats( struct work *work, const void *hash )
 bool submit_solution( struct work *work, const void *hash,
                       struct thr_info *thr )
 {
-   // Job went stale during hashing of a valid share.
-   if ( !opt_quiet && work_restart[ thr->id ].restart )
-      applog( LOG_INFO, CL_LBL "Share may be stale, submitting anyway..." CL_N );
+// Job went stale during hashing of a valid share.
+//   if ( !opt_quiet && work_restart[ thr->id ].restart )
+//      applog( LOG_INFO, CL_LBL "Share may be stale, submitting anyway..." CL_N );
    
    work->sharediff = hash_to_diff( hash );
    if ( likely( submit_work( thr, work ) ) )
@@ -1918,32 +1885,34 @@ bool submit_solution( struct work *work, const void *hash,
      if ( !opt_quiet )
      {
         if ( have_stratum )
+        {
            applog( LOG_INFO, "%d Submitted Diff %.5g, Block %d, Job %s",
                    submitted_share_count, work->sharediff, work->height,
                    work->job_id );
+           if ( opt_debug && opt_extranonce )
+           {
+              unsigned char *xnonce2str = abin2hex( work->xnonce2,
+                                                    work->xnonce2_len );
+              applog( LOG_INFO, "Xnonce2 %s", xnonce2str );
+              free( xnonce2str );
+           }
+        }
         else
            applog( LOG_INFO, "%d Submitted Diff %.5g, Block %d, Ntime %08x",
                    submitted_share_count, work->sharediff, work->height,
                    work->data[ algo_gate.ntime_index ] );
-     }
 
-     if ( opt_debug )
-     {
-        uint32_t* h = (uint32_t*)hash;
-        uint32_t* t = (uint32_t*)work->target;
-        uint32_t* d = (uint32_t*)work->data;
+        if ( opt_debug )
+        {
+           uint32_t* h = (uint32_t*)hash;
+           uint32_t* t = (uint32_t*)work->target;
+           uint32_t* d = (uint32_t*)work->data;
 
-        unsigned char *xnonce2str = abin2hex( work->xnonce2,
-                                              work->xnonce2_len );
-        applog(LOG_INFO,"Thread %d, Nonce %08x, Xnonce2 %s", thr->id,
-                       work->data[ algo_gate.nonce_index ], xnonce2str );
-        free( xnonce2str );
-        applog(LOG_INFO,"Data[0:19]: %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x", d[0],d[1],d[2],d[3],d[4],d[5],d[6],d[7],d[8],d[9] );
-        applog(LOG_INFO,"          : %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x", d[10],d[11],d[12],d[13],d[14],d[15],d[16],d[17],d[18],d[19]);
-        applog(LOG_INFO,"Hash[7:0]: %08x %08x %08x %08x %08x %08x %08x %08x",
-                                    h[7],h[6],h[5],h[4],h[3],h[2],h[1],h[0]);
-        applog(LOG_INFO,"Targ[7:0]: %08x %08x %08x %08x %08x %08x %08x %08x",
-                                    t[7],t[6],t[5],t[4],t[3],t[2],t[1],t[0]);
+           applog( LOG_INFO, "Data[ 0: 9]: %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x", d[0],d[1],d[2],d[3],d[4],d[5],d[6],d[7],d[8],d[9] );
+           applog( LOG_INFO, "Data[10:19]: %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x", d[10],d[11],d[12],d[13],d[14],d[15],d[16],d[17],d[18],d[19] );
+           applog( LOG_INFO, "Hash[ 7: 0]: %08x %08x %08x %08x %08x %08x %08x %08x", h[7],h[6],h[5],h[4],h[3],h[2],h[1],h[0] );
+           applog( LOG_INFO, "Targ[ 7: 0]: %08x %08x %08x %08x %08x %08x %08x %08x", t[7],t[6],t[5],t[4],t[3],t[2],t[1],t[0] );
+        }
      }
      return true;
    }
@@ -2019,33 +1988,6 @@ void set_work_data_big_endian( struct work *work )
         be32enc( work->data + i, work->data[i] );
 }
 
-// calculate net diff from nbits.
-double std_calc_network_diff( struct work* work )
-{
-   uint32_t nbits = work->data[ algo_gate.nbits_index ];
-   uint32_t shift = nbits & 0xff;
-   uint32_t bits = bswap_32( nbits ) & 0x00ffffff;
-/*
-   // sample for diff 43.281 : 1c05ea29
-   // todo: endian reversed on longpoll could be zr5 specific...
-   int nbits_index = algo_gate.nbits_index;
-   uint32_t nbits = have_longpoll ? work->data[ nbits_index]
-                                  : swab32( work->data[ nbits_index ] );
-   uint32_t bits  = ( nbits & 0xffffff );
-   int16_t  shift = ( swab32(nbits) & 0xff ); // 0x1c = 28
-*/
-
-   int m;
-   long double d = (long double)0x0000ffff / (long double)bits;
-   for ( m = shift; m < 29; m++ )
-       d *= 256.0;
-   for ( m = 29; m < shift; m++ )
-       d /= 256.0;
-   if ( opt_debug_diff )
-      applog(LOG_DEBUG, "net diff: %8f -> shift %u, bits %08x", (double)d, shift, bits);
-   return (double)d;
-}
-
 void std_get_new_work( struct work* work, struct work* g_work, int thr_id,
                      uint32_t *end_nonce_ptr )
 {
@@ -2069,17 +2011,6 @@ void std_get_new_work( struct work* work, struct work* g_work, int thr_id,
        ++(*nonceptr);
 }
 
-bool std_ready_to_mine( struct work* work, struct stratum_ctx* stratum,
-                           int thr_id )
-{
-   if ( have_stratum && !work->data[0] && !opt_benchmark )
-   {
-      sleep(1);
-      return false;
-   }
-   return true;
-}
-
 static void stratum_gen_work( struct stratum_ctx *sctx, struct work *g_work )
 {
    bool new_job;
@@ -2096,7 +2027,7 @@ static void stratum_gen_work( struct stratum_ctx *sctx, struct work *g_work )
    g_work->xnonce2 = (uchar*) realloc( g_work->xnonce2, sctx->xnonce2_size );
    memcpy( g_work->xnonce2, sctx->job.xnonce2, sctx->xnonce2_size );
    algo_gate.build_extraheader( g_work, sctx );
-   net_diff = algo_gate.calc_network_diff( g_work );
+   net_diff = nbits_to_diff( g_work->data[ algo_gate.nbits_index ] );
    algo_gate.set_work_data_endian( g_work );
    g_work->height = sctx->block_height;
    g_work->targetdiff = sctx->job.diff
@@ -2133,7 +2064,7 @@ static void stratum_gen_work( struct stratum_ctx *sctx, struct work *g_work )
    else if ( g_work->job_id && new_job )
       applog( LOG_BLUE, "New Work: Block %d, Net diff %.5g, Job %s",
                          sctx->block_height, net_diff, g_work->job_id );
-   else if ( opt_debug )
+   else if ( !opt_quiet )
    {
       unsigned char *xnonce2str = bebin2hex( g_work->xnonce2,
                                              g_work->xnonce2_len );
@@ -2146,8 +2077,6 @@ static void stratum_gen_work( struct stratum_ctx *sctx, struct work *g_work )
    if ( ( stratum_diff != sctx->job.diff )
    || ( last_block_height != sctx->block_height ) )
    {
-      static bool multipool = false;
-      if ( stratum.block_height < last_block_height ) multipool = true;
       if ( unlikely( !session_first_block ) )
          session_first_block = stratum.block_height;
       last_block_height = stratum.block_height;
@@ -2155,58 +2084,47 @@ static void stratum_gen_work( struct stratum_ctx *sctx, struct work *g_work )
       last_targetdiff   = g_work->targetdiff;
       if ( lowest_share < last_targetdiff )
          lowest_share = 9e99;
+    }
 
-      if ( !opt_quiet )
-      {
-         applog2( LOG_INFO, "Diff: Net %.5g, Stratum %.5g, Target %.5g",
-                            net_diff, stratum_diff, g_work->targetdiff );
+    if ( !opt_quiet )
+    {
+       applog2( LOG_INFO, "Diff: Net %.5g, Stratum %.5g, Target %.5g",
+                          net_diff, stratum_diff, g_work->targetdiff );
 
-         if ( likely( hr > 0. ) )
-         {
-            double nd = net_diff * exp32;
-            char hr_units[4] = {0};
-            char block_ttf[32];
-            char share_ttf[32];
+       if ( likely( hr > 0. ) )
+       {
+          double nd = net_diff * exp32;
+          char hr_units[4] = {0};
+          char block_ttf[32];
+          char share_ttf[32];
+          static bool multipool = false;
+      
+          if ( stratum.block_height < last_block_height ) multipool = true;
+            
+          sprintf_et( block_ttf, nd / hr );
+          sprintf_et( share_ttf, ( g_work->targetdiff * exp32 ) / hr );
+          scale_hash_for_display ( &hr, hr_units );
+          applog2( LOG_INFO, "TTF @ %.2f %sh/s: Block %s, Share %s",
+                             hr, hr_units, block_ttf, share_ttf );
 
-            sprintf_et( block_ttf, nd / hr );
-            sprintf_et( share_ttf, ( g_work->targetdiff * exp32 ) / hr );
-            scale_hash_for_display ( &hr, hr_units );
-            applog2( LOG_INFO, "TTF @ %.2f %sh/s: Block %s, Share %s",
-                               hr, hr_units, block_ttf, share_ttf );
-
-            if ( !multipool && last_block_height > session_first_block )
-            {
-               struct timeval now, et;
-               gettimeofday( &now, NULL );
-               timeval_subtract( &et, &now, &session_start );
-               uint64_t net_ttf =
-                    ( last_block_height - session_first_block ) == 0 ? 0
-                    : et.tv_sec / ( last_block_height - session_first_block );
-               if ( net_diff > 0. && net_ttf )
-               {
-                  double net_hr = nd / net_ttf;
-                  char net_hr_units[4] = {0};
-                  scale_hash_for_display ( &net_hr, net_hr_units );
-                  applog2( LOG_INFO, "Net hash rate (est) %.2f %sh/s",
-                                     net_hr, net_hr_units );
-               }
-            }
-         }  // hr > 0
-      } // !quiet
-   }  // new diff/block
-
-/*   
-   if ( new_job && !( opt_quiet || stratum_errors ) )
-   {
-      int mismatch = submitted_share_count - ( accepted_share_count
-                                             + stale_share_count
-                                             + rejected_share_count );
-      if ( mismatch )
-         applog( LOG_INFO,
-                 CL_LBL "%d Submitted share pending, maybe stale" CL_N,
-                 submitted_share_count );
-   }
-*/
+          if ( !multipool && last_block_height > session_first_block )
+          {
+             struct timeval now, et;
+             gettimeofday( &now, NULL );
+             timeval_subtract( &et, &now, &session_start );
+             uint64_t net_ttf = safe_div( et.tv_sec,
+                                 last_block_height - session_first_block, 0 );
+             if ( net_diff > 0. && net_ttf )
+             {
+                double net_hr = safe_div( nd, net_ttf, 0. );
+                char net_hr_units[4] = {0};
+                scale_hash_for_display ( &net_hr, net_hr_units );
+                applog2( LOG_INFO, "Net hash rate (est) %.2f %sh/s",
+                                   net_hr, net_hr_units );
+             }
+          }
+       }  // hr > 0
+    } // !quiet
 }
 
 static void *miner_thread( void *userdata )
@@ -2344,9 +2262,6 @@ static void *miner_thread( void *userdata )
        } // do_this_thread
        algo_gate.resync_threads( thr_id, &work );
 
-       if ( unlikely( !algo_gate.ready_to_mine( &work, &stratum, thr_id ) ) )
-          continue;
-
        // conditional mining
        if ( unlikely( !wanna_mine( thr_id ) ) )
        {
diff --git a/miner.h b/miner.h
index 7bfc9f2..f9bba51 100644
--- a/miner.h
+++ b/miner.h
@@ -330,7 +330,7 @@ extern void cbin2hex(char *out, const char *in, size_t len);
 void   bin2hex( char *s, const unsigned char *p, size_t len );
 char  *abin2hex( const unsigned char *p, size_t len );
 char  *bebin2hex( const unsigned char *p, size_t len );
-bool   hex2bin( unsigned char *p, const char *hexstr, size_t len );
+bool   hex2bin( unsigned char *p, const char *hexstr, const size_t len );
 bool   jobj_binary( const json_t *obj, const char *key, void *buf,
                     size_t buflen );
 int    varint_encode( unsigned char *p, uint64_t n );
@@ -346,10 +346,7 @@ extern void memrev(unsigned char *p, size_t len);
 // number of hashes.
 //
 //     https://en.bitcoin.it/wiki/Difficulty
-//
 //     hash = diff * 2**32
-//
-// diff_to_hash = 2**32 = 0x100000000 = 4294967296 = exp32;
 
 #define EXP16 65536.
 #define EXP32 4294967296.
@@ -363,8 +360,9 @@ extern const long double exp160; // 2**160
 bool   fulltest( const uint32_t *hash, const uint32_t *target );
 bool   valid_hash( const void*, const void* );
 
-double hash_to_diff( const void* );
+extern double hash_to_diff( const void* );
 extern void diff_to_hash( uint32_t*, const double );
+extern double nbits_to_diff( uint32_t );
 
 double hash_target_ratio( uint32_t* hash, uint32_t* target );
 void   work_set_target_ratio( struct work* work, const void *hash );
@@ -553,7 +551,6 @@ enum algos {
         ALGO_BMW,        
         ALGO_BMW512,
         ALGO_C11,         
-        ALGO_DECRED,
         ALGO_DEEP,
         ALGO_DMD_GR,
         ALGO_GROESTL,     
@@ -647,7 +644,6 @@ static const char* const algo_names[] = {
         "bmw",
         "bmw512",
         "c11",
-        "decred",
         "deep",
         "dmd-gr",
         "groestl",
@@ -808,7 +804,6 @@ Options:\n\
                           bmw           BMW 256\n\
                           bmw512        BMW 512\n\
                           c11           Chaincoin\n\
-                          decred        Blake256r14dcr\n\
                           deep          Deepcoin (DCN)\n\
                           dmd-gr        Diamond\n\
                           groestl       Groestl coin\n\
diff --git a/simd-utils/simd-256.h b/simd-utils/simd-256.h
index 2580d7a..12ae43b 100644
--- a/simd-utils/simd-256.h
+++ b/simd-utils/simd-256.h
@@ -15,6 +15,8 @@
 //
 // "_mm256_shuffle_epi8" and "_mm256_alignr_epi8" are restricted to 128 bit
 // lanes and data can't cross the 128 bit lane boundary.  
+// Full width byte shuffle is available with AVX512VL using the mask version
+// with a full mask (-1). 
 // Instructions that can move data across 128 bit lane boundary incur a
 // performance penalty over those that can't.
 // Some usage of index vectors may be encoded as if full vector shuffles are
@@ -422,8 +424,7 @@ static inline __m256i mm256_shuflr128_x8( const __m256i v, const int c )
   #define mm256_shuflr64_24( v )  _mm256_ror_epi64( v, 24 )
 #else
   #define mm256_shuflr64_24( v ) \
-    _mm256_shuffle_epi8( v, _mm256_set_epi64x( \
-                                    0x0a09080f0e0d0c0b, 0x0201000706050403, \
+    _mm256_shuffle_epi8( v, m256_const2_64( \
                                     0x0a09080f0e0d0c0b, 0x0201000706050403 ) )
 #endif
 
@@ -431,8 +432,7 @@ static inline __m256i mm256_shuflr128_x8( const __m256i v, const int c )
   #define mm256_shuflr64_16( v )  _mm256_ror_epi64( v, 16 )
 #else
   #define mm256_shuflr64_16( v ) \
-    _mm256_shuffle_epi8( v, _mm256_set_epi64x( \
-                                    0x09080f0e0d0c0b0a, 0x0100070605040302, \
+    _mm256_shuffle_epi8( v, m256_const2_64( \
                                     0x09080f0e0d0c0b0a, 0x0100070605040302 ) )
 #endif
 
@@ -440,8 +440,7 @@ static inline __m256i mm256_shuflr128_x8( const __m256i v, const int c )
   #define mm256_swap32_16( v )  _mm256_ror_epi32( v, 16 )
 #else
   #define mm256_swap32_16( v ) \
-    _mm256_shuffle_epi8( v, _mm256_set_epi64x( \
-                                    0x0d0c0f0e09080b0a, 0x0504070601000302, \
+    _mm256_shuffle_epi8( v, m256_const2_64( \
                                     0x0d0c0f0e09080b0a, 0x0504070601000302 ) )
 #endif
 #define mm256_shuflr32_16 mm256_swap32_16
@@ -456,35 +455,24 @@ static inline __m256i mm256_shuflr128_x8( const __m256i v, const int c )
                                     0x0c0f0e0d080b0a09, 0x0407060500030201 ) )
 #endif
 
-// NOTE: _mm256_shuffle_epi8, like most shuffles, is restricted to 128 bit
-// lanes. AVX512, however, supports full vector 8 bit shuffle. The AVX512VL +
-// AVX512BW intrinsic _mm256_mask_shuffle_epi8 with a NULL mask, can be used if
-// needed for a shuffle that crosses 128 bit lanes. BSWAP doesn't therefore the
-// AVX2 version will work here. The bswap control vector is coded to work
-// with both versions, bit 4 is ignored in AVX2. 
-
 // Reverse byte order in elements, endian bswap.
 #define mm256_bswap_64( v ) \
    _mm256_shuffle_epi8( v, \
-         m256_const_64( 0x18191a1b1c1d1e1f, 0x1011121314151617, \
-                        0x08090a0b0c0d0e0f, 0x0001020304050607 ) )
+         m256_const2_64( 0x08090a0b0c0d0e0f, 0x0001020304050607 ) )
 
 #define mm256_bswap_32( v ) \
    _mm256_shuffle_epi8( v, \
-         m256_const_64( 0x1c1d1e1f18191a1b, 0x1415161710111213, \
-                        0x0c0d0e0f08090a0b, 0x0405060700010203 ) )
+         m256_const2_64( 0x0c0d0e0f08090a0b, 0x0405060700010203 ) )
 
 #define mm256_bswap_16( v ) \
    _mm256_shuffle_epi8( v, \
-         m256_const_64( 0x1e1f1c1d1a1b1819, 0x1617141512131011, \
-                        0x0e0f0c0d0a0b0809, 0x0607040502030001, ) )
+         m256_const2_64( 0x0e0f0c0d0a0b0809, 0x0607040502030001, ) )
 
 // Source and destination are pointers, may point to same memory.
 // 8 byte qword * 8 qwords * 4 lanes = 256 bytes
 #define mm256_block_bswap_64( d, s ) do \
 { \
-  __m256i ctl = m256_const_64( 0x18191a1b1c1d1e1f, 0x1011121314151617, \
-                               0x08090a0b0c0d0e0f, 0x0001020304050607 ) ; \
+  __m256i ctl = m256_const2_64( 0x08090a0b0c0d0e0f, 0x0001020304050607 ) ; \
   casti_m256i( d, 0 ) = _mm256_shuffle_epi8( casti_m256i( s, 0 ), ctl ); \
   casti_m256i( d, 1 ) = _mm256_shuffle_epi8( casti_m256i( s, 1 ), ctl ); \
   casti_m256i( d, 2 ) = _mm256_shuffle_epi8( casti_m256i( s, 2 ), ctl ); \
@@ -498,8 +486,7 @@ static inline __m256i mm256_shuflr128_x8( const __m256i v, const int c )
 // 4 byte dword * 8 dwords * 8 lanes = 256 bytes
 #define mm256_block_bswap_32( d, s ) do \
 { \
-  __m256i ctl = m256_const_64( 0x1c1d1e1f18191a1b, 0x1415161710111213, \
-                               0x0c0d0e0f08090a0b, 0x0405060700010203 ); \
+  __m256i ctl = m256_const2_64( 0x0c0d0e0f08090a0b, 0x0405060700010203 ); \
   casti_m256i( d, 0 ) = _mm256_shuffle_epi8( casti_m256i( s, 0 ), ctl ); \
   casti_m256i( d, 1 ) = _mm256_shuffle_epi8( casti_m256i( s, 1 ), ctl ); \
   casti_m256i( d, 2 ) = _mm256_shuffle_epi8( casti_m256i( s, 2 ), ctl ); \
diff --git a/simd-utils/simd-512.h b/simd-utils/simd-512.h
index cad8300..dc3f14d 100644
--- a/simd-utils/simd-512.h
+++ b/simd-utils/simd-512.h
@@ -412,16 +412,16 @@ static inline __m512i mm512_shuflr_x32( const __m512i v, const int n )
 #define mm512_shuflr_16( v ) \
    _mm512_permutexvar_epi16( m512_const_64( \
                        0x0000001F001E001D, 0x001C001B001A0019, \
-                       0X0018001700160015, 0X0014001300120011, \
-                       0X0010000F000E000D, 0X000C000B000A0009, \
-                       0X0008000700060005, 0X0004000300020001 ), v )
+                       0x0018001700160015, 0x0014001300120011, \
+                       0x0010000F000E000D, 0x000C000B000A0009, \
+                       0x0008000700060005, 0x0004000300020001 ), v )
 
 #define mm512_shufll_16( v ) \
    _mm512_permutexvar_epi16( m512_const_64( \
                        0x001E001D001C001B, 0x001A001900180017, \
-                       0X0016001500140013, 0X001200110010000F, \
-                       0X000E000D000C000B, 0X000A000900080007, \
-                       0X0006000500040003, 0X000200010000001F ), v )
+                       0x0016001500140013, 0x001200110010000F, \
+                       0x000E000D000C000B, 0x000A000900080007, \
+                       0x0006000500040003, 0x000200010000001F ), v )
 
 #define mm512_shuflr_8( v ) \
    _mm512_shuffle_epi8( v, m512_const_64( \
diff --git a/util.c b/util.c
index fde2d98..f71421a 100644
--- a/util.c
+++ b/util.c
@@ -44,28 +44,22 @@
 #include <libgen.h>
 #endif
 
-//#include "miner.h"
 #include "elist.h"
 #include "algo-gate-api.h"
 #include "algo/sha/sha256d.h"
 
-//extern pthread_mutex_t stats_lock;
-
-struct data_buffer {
-	void		*buf;
-	size_t		len;
-};
-
-struct upload_buffer {
-	const void	*buf;
-	size_t		len;
-	size_t		pos;
-};
-
 struct header_info {
 	char		*lp_path;
 	char		*reason;
 	char		*stratum_url;
+   size_t	content_length;
+};
+
+struct data_buffer {
+	void			*buf;
+	size_t			len;
+	size_t			allocated;
+	struct header_info	*headers;
 };
 
 struct tq_ent {
@@ -127,7 +121,6 @@ void applog2( int prio, const char *fmt, ... )
       int len;
 //    struct tm tm;
 //    time_t now = time(NULL);
-
 //    localtime_r(&now, &tm);
 
       switch ( prio )
@@ -395,67 +388,53 @@ static void databuf_free(struct data_buffer *db)
 static size_t all_data_cb(const void *ptr, size_t size, size_t nmemb,
 			  void *user_data)
 {
-	struct data_buffer *db = (struct data_buffer *) user_data;
+	struct data_buffer *db = user_data;
 	size_t len = size * nmemb;
-	size_t oldlen, newlen;
+	size_t newalloc, reqalloc;
 	void *newmem;
 	static const unsigned char zero = 0;
+	static const size_t max_realloc_increase = 8 * 1024 * 1024;
+	static const size_t initial_alloc = 16 * 1024;
 
-	oldlen = db->len;
-	newlen = oldlen + len;
+	/* minimum required allocation size */
+	reqalloc = db->len + len + 1;
 
-	newmem = realloc(db->buf, newlen + 1);
-	if (!newmem)
-		return 0;
+	if (reqalloc > db->allocated) {
+		if (db->len > 0) {
+			newalloc = db->allocated * 2;
+		} else {
+			if (db->headers->content_length > 0)
+				newalloc = db->headers->content_length + 1;
+			else
+				newalloc = initial_alloc;
+		}
 
-	db->buf = newmem;
-	db->len = newlen;
-	memcpy((uchar*) db->buf + oldlen, ptr, len);
-	memcpy((uchar*) db->buf + newlen, &zero, 1);	/* null terminate */
+		if (db->headers->content_length == 0) {
+			/* limit the maximum buffer increase */
+			if (newalloc - db->allocated > max_realloc_increase)
+				newalloc = db->allocated + max_realloc_increase;
+		}
+
+		/* ensure we have a big enough allocation */
+		if (reqalloc > newalloc)
+			newalloc = reqalloc;
+
+		newmem = realloc(db->buf, newalloc);
+		if (!newmem)
+			return 0;
+
+		db->buf = newmem;
+		db->allocated = newalloc;
+	}
+
+	memcpy(db->buf + db->len, ptr, len); /* append new data */
+	memcpy(db->buf + db->len + len, &zero, 1); /* null terminate */
+
+	db->len += len;
 
 	return len;
 }
 
-static size_t upload_data_cb(void *ptr, size_t size, size_t nmemb,
-			     void *user_data)
-{
-	struct upload_buffer *ub = (struct upload_buffer *) user_data;
-	size_t len = size * nmemb;
-
-	if (len > ub->len - ub->pos)
-		len = ub->len - ub->pos;
-
-	if (len) {
-		memcpy(ptr, ((uchar*)ub->buf) + ub->pos, len);
-		ub->pos += len;
-	}
-
-	return len;
-}
-
-#if LIBCURL_VERSION_NUM >= 0x071200
-static int seek_data_cb(void *user_data, curl_off_t offset, int origin)
-{
-	struct upload_buffer *ub = (struct upload_buffer *) user_data;
-	
-	switch (origin) {
-	case SEEK_SET:
-		ub->pos = (size_t) offset;
-		break;
-	case SEEK_CUR:
-		ub->pos += (size_t) offset;
-		break;
-	case SEEK_END:
-		ub->pos = ub->len + (size_t) offset;
-		break;
-	default:
-		return 1; /* CURL_SEEKFUNC_FAIL */
-	}
-
-	return 0; /* CURL_SEEKFUNC_OK */
-}
-#endif
-
 static size_t resp_hdr_cb(void *ptr, size_t size, size_t nmemb, void *user_data)
 {
 	struct header_info *hi = (struct header_info *) user_data;
@@ -505,6 +484,9 @@ static size_t resp_hdr_cb(void *ptr, size_t size, size_t nmemb, void *user_data)
 		val = NULL;
 	}
 
+	if (!strcasecmp("Content-Length", key))
+		hi->content_length = strtoul(val, NULL, 10);
+
 out:
 	free(key);
 	free(val);
@@ -564,48 +546,37 @@ json_t *json_rpc_call(CURL *curl, const char *url,
 	int rc;
 	long http_rc;
 	struct data_buffer all_data = {0};
-	struct upload_buffer upload_data;
 	char *json_buf;
 	json_error_t err;
 	struct curl_slist *headers = NULL;
-	char len_hdr[64];
 	char curl_err_str[CURL_ERROR_SIZE] = { 0 };
 	long timeout = (flags & JSON_RPC_LONGPOLL) ? opt_timeout : 30;
 	struct header_info hi = {0};
 
 	/* it is assumed that 'curl' is freshly [re]initialized at this pt */
 
-	if (opt_protocol)
-		curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
+	if (opt_protocol)  curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 	curl_easy_setopt(curl, CURLOPT_URL, url);
-	if (opt_cert)
-		curl_easy_setopt(curl, CURLOPT_CAINFO, opt_cert);
-//
-        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
-
+	if (opt_cert)      curl_easy_setopt(curl, CURLOPT_CAINFO, opt_cert);
+   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
 	curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 	curl_easy_setopt(curl, CURLOPT_FAILONERROR, 0);
 	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
 	curl_easy_setopt(curl, CURLOPT_TCP_NODELAY, 1);
 	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, all_data_cb);
 	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &all_data);
-	curl_easy_setopt(curl, CURLOPT_READFUNCTION, upload_data_cb);
-	curl_easy_setopt(curl, CURLOPT_READDATA, &upload_data);
-#if LIBCURL_VERSION_NUM >= 0x071200
-	curl_easy_setopt(curl, CURLOPT_SEEKFUNCTION, &seek_data_cb);
-	curl_easy_setopt(curl, CURLOPT_SEEKDATA, &upload_data);
-#endif
-	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_err_str);
-	if (opt_redirect)
-		curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
+   curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_err_str);
+	if (opt_redirect)  curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 	curl_easy_setopt(curl, CURLOPT_TIMEOUT, timeout);
 	curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, resp_hdr_cb);
 	curl_easy_setopt(curl, CURLOPT_HEADERDATA, &hi);
-	if (opt_proxy) {
+	if (opt_proxy)
+   {
 		curl_easy_setopt(curl, CURLOPT_PROXY, opt_proxy);
 		curl_easy_setopt(curl, CURLOPT_PROXYTYPE, opt_proxy_type);
 	}
-	if (userpass) {
+	if (userpass)
+   {
 		curl_easy_setopt(curl, CURLOPT_USERPWD, userpass);
 		curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
 	}
@@ -613,23 +584,16 @@ json_t *json_rpc_call(CURL *curl, const char *url,
 	if (flags & JSON_RPC_LONGPOLL)
 		curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_keepalive_cb);
 #endif
-	curl_easy_setopt(curl, CURLOPT_POST, 1);
+   curl_easy_setopt(curl, CURLOPT_POSTFIELDS, rpc_req);
 
 	if (opt_protocol)
 		applog(LOG_DEBUG, "JSON protocol request:\n%s\n", rpc_req);
 
-	upload_data.buf = rpc_req;
-	upload_data.len = strlen(rpc_req);
-	upload_data.pos = 0;
-	sprintf(len_hdr, "Content-Length: %lu",
-		(unsigned long) upload_data.len);
-
 	headers = curl_slist_append(headers, "Content-Type: application/json");
-	headers = curl_slist_append(headers, len_hdr);
 	headers = curl_slist_append(headers, "User-Agent: " USER_AGENT);
 	headers = curl_slist_append(headers, "X-Mining-Extensions: longpoll reject-reason");
-	//headers = curl_slist_append(headers, "Accept:"); /* disable Accept hdr*/
-	//headers = curl_slist_append(headers, "Expect:"); /* disable Expect hdr*/
+	//headers = curl_slist_append(headers, "Accept:"); // disable Accept hdr
+	//headers = curl_slist_append(headers, "Expect:"); // disable Expect hdr
 
 	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
 
@@ -791,7 +755,6 @@ void memrev(unsigned char *p, size_t len)
    if ( len == 32 )
    {
       __m128i *pv = (__m128i*)p;
-   
       __m128i t = mm128_bswap_128( pv[0] );
       pv[0] =     mm128_bswap_128( pv[1] );   
       pv[1] = t;
@@ -841,32 +804,42 @@ char *bebin2hex(const unsigned char *p, size_t len)
    return s;
 }
 
-bool hex2bin(unsigned char *p, const char *hexstr, size_t len)
+bool hex2bin( unsigned char *p, const char *hexstr, const size_t len )
 {
-	char hex_byte[3];
-	char *ep;
+	if( hexstr == NULL )	return false;
 
-	hex_byte[2] = '\0';
-
-	while (*hexstr && len) {
-		if (!hexstr[1]) {
-			applog(LOG_ERR, "hex2bin str truncated");
-			return false;
-		}
-		hex_byte[0] = hexstr[0];
-		hex_byte[1] = hexstr[1];
-		*p = (unsigned char) strtol(hex_byte, &ep, 16);
-		if (*ep) {
-			applog(LOG_ERR, "hex2bin failed on '%s'", hex_byte);
-			return false;
-		}
-		p++;
-		hexstr += 2;
-		len--;
+	size_t hexstr_len = strlen( hexstr );
+	if( ( hexstr_len % 2 ) != 0 )
+   {
+		applog( LOG_ERR, "hex2bin string truncated" );
+		return false;
+	}
+	size_t bin_len = hexstr_len / 2;
+	if ( bin_len > len )
+   {
+		applog( LOG_ERR, "hex2bin buffer too small" );
+		return false;
 	}
 
-	return(!len) ? true : false;
-/*	return (len == 0 && *hexstr == 0) ? true : false; */
+	memset( p, 0, len );
+	size_t i = 0;
+	while ( i < hexstr_len )
+   {
+		char c = hexstr[i];
+		unsigned char nibble;
+		if      ( c >= '0' && c <= '9' )	 nibble = (c - '0');
+		else if ( c >= 'A' && c <= 'F' )	 nibble = ( 10 + (c - 'A') );
+		else if ( c >= 'a' && c <= 'f' )	 nibble = ( 10 + (c - 'a') );
+		else
+      {
+			applog( LOG_ERR, "hex2bin invalid hex" );
+			return false;
+		}
+		p[(i / 2)] |= (nibble << ( (1 - (i % 2) ) * 4) );
+		i++;
+	}
+
+	return true;
 }
 
 int varint_encode(unsigned char *p, uint64_t n)
@@ -1348,6 +1321,43 @@ inline bool valid_hash( const void *hash, const void *target )
 
 #endif 
 
+inline double nbits_to_diff( uint32_t nbits )
+{
+   long double diff;
+   uint32_t shift = nbits & 0xff;
+   uint32_t bits = bswap_32( nbits ) & 0x00ffffff;
+   int shift_off = (int)shift - 29;
+
+   // diff = ( (2**16 -1) / ( 256**shift_off * bits )
+   // With uint128 byte shift is good for 16 <= shift <= 41. As unlikely
+   // as this may seem necessary, check just in case.
+
+   if ( shift_off >= -13 && shift_off <= 12 ) 
+   {  // fast
+      if ( shift_off == 0 )
+         diff = (long double)0xffff / (long double)bits;
+      else if ( shift_off < 0 )   // shift < 29
+         diff = (long double)( (uint128_t)0xffff << ( (-shift_off) *8 ) ) 
+              / (long double)bits;
+      else // ( shift_off > 0 )   // shift > 29
+         diff =   (long double)0xffff
+                / (long double)( (uint128_t)bits << ( shift_off*8 ) );  
+   }
+   else
+   {  // slow
+      int m;
+      diff = 0.;
+      for ( m = shift; m < 29; m++ )    diff *= 256.0;
+      for ( m = 29; m < shift; m++ )    diff /= 256.0;
+   }
+
+   if ( opt_debug )
+      applog( LOG_INFO, "nbits %08x: shift %u(%d), bits %06x, diff %8g",
+                         nbits, shift, shift_off, bits, (double)diff );
+
+   return (double)diff;
+}
+
 #ifdef WIN32
 #define socket_blocks() (WSAGetLastError() == WSAEWOULDBLOCK)
 #else
@@ -1516,7 +1526,8 @@ out:
 	return sret;
 }
 
-#if LIBCURL_VERSION_NUM >= 0x071101
+#if LIBCURL_VERSION_NUM >= 0x071101 && LIBCURL_VERSION_NUM < 0x072d00
+//#if LIBCURL_VERSION_NUM >= 0x071101
 static curl_socket_t opensocket_grab_cb(void *clientp, curlsocktype purpose,
 	struct curl_sockaddr *addr)
 {
@@ -1584,7 +1595,8 @@ bool stratum_connect(struct stratum_ctx *sctx, const char *url)
 #if LIBCURL_VERSION_NUM >= 0x070f06
 	curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_keepalive_cb);
 #endif
-#if LIBCURL_VERSION_NUM >= 0x071101
+#if LIBCURL_VERSION_NUM >= 0x071101 && LIBCURL_VERSION_NUM < 0x072d00
+//#if LIBCURL_VERSION_NUM >= 0x071101
 	curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, opensocket_grab_cb);
 	curl_easy_setopt(curl, CURLOPT_OPENSOCKETDATA, &sctx->sock);
 #endif
@@ -1598,7 +1610,10 @@ bool stratum_connect(struct stratum_ctx *sctx, const char *url)
 		return false;
 	}
 
-#if LIBCURL_VERSION_NUM < 0x071101
+#if LIBCURL_VERSION_NUM >= 0x072d00
+	curl_easy_getinfo(curl, CURLINFO_ACTIVESOCKET, &sctx->sock);
+#elif LIBCURL_VERSION_NUM < 0x071101   
+//#if LIBCURL_VERSION_NUM < 0x071101
 	/* CURLINFO_LASTSOCKET is broken on Win64; only use it as a last resort */
 	curl_easy_getinfo(curl, CURLINFO_LASTSOCKET, (long *)&sctx->sock);
 #endif
@@ -1894,7 +1909,8 @@ static uint32_t getblocheight(struct stratum_ctx *sctx)
 
 	// find 0xffff tag
 	p = (uint8_t*) sctx->job.coinbase + 32;
-	m = p + 128;
+   m = p + sctx->job.coinbase_size - 32 - 2;
+//   m = p + 128;
 	while (*p != 0xff && p < m) p++;
 	while (*p == 0xff && p < m) p++;
 	if (*(p-1) == 0xff && *(p-2) == 0xff) {