diff --git a/stratum/algos/phi2.c b/stratum/algos/phi2.c
index 59d34bb..1aad372 100644
--- a/stratum/algos/phi2.c
+++ b/stratum/algos/phi2.c
@@ -16,9 +16,9 @@
 
 void phi2_hash(const char* input, char* output, uint32_t len)
 {
-	unsigned char _ALIGN(128) hash[128] = { 0 };
-	unsigned char _ALIGN(128) hashA[64] = { 0 };
-	unsigned char _ALIGN(128) hashB[64] = { 0 };
+	unsigned char _ALIGN(128) hash[64];
+	unsigned char _ALIGN(128) hashA[64];
+	unsigned char _ALIGN(128) hashB[64];
 
 	sph_cubehash512_context ctx_cubehash;
 	sph_jh512_context ctx_jh;
@@ -27,7 +27,7 @@ void phi2_hash(const char* input, char* output, uint32_t len)
 	sph_skein512_context ctx_skein;
 
 	sph_cubehash512_init(&ctx_cubehash);
-	sph_cubehash512(&ctx_cubehash, input, 80);
+	sph_cubehash512(&ctx_cubehash, input, len);
 	sph_cubehash512_close(&ctx_cubehash, (void*)hashB);
 
 	LYRA2(&hashA[ 0], 32, &hashB[ 0], 32, &hashB[ 0], 32, 1, 8, 8);
diff --git a/stratum/client_submit.cpp b/stratum/client_submit.cpp
index c3f19d6..5344800 100644
--- a/stratum/client_submit.cpp
+++ b/stratum/client_submit.cpp
@@ -31,10 +31,14 @@ void build_submit_values(YAAMP_JOB_VALUES *submitvalues, YAAMP_JOB_TEMPLATE *tem
 #ifdef MERKLE_DEBUGLOG
 	printf("merkle root %s\n", merkleroot.c_str());
 #endif
-	if (!strcmp(g_current_algo->name, "lbry")) {
+	if (!strcmp(g_stratum_algo, "lbry")) {
 		sprintf(submitvalues->header, "%s%s%s%s%s%s%s", templ->version, templ->prevhash_be, submitvalues->merkleroot_be,
 			templ->claim_be, ntime, templ->nbits, nonce);
-		ser_string_be(submitvalues->header, submitvalues->header_be, 32 + 20);
+		ser_string_be(submitvalues->header, submitvalues->header_be, 112/4);
+	} else if (strlen(templ->extradata_be) == 128) { // LUX SC
+		sprintf(submitvalues->header, "%s%s%s%s%s%s%s", templ->version, templ->prevhash_be, submitvalues->merkleroot_be,
+			ntime, templ->nbits, nonce, templ->extradata_be);
+		ser_string_be(submitvalues->header, submitvalues->header_be, 36); // 80+64 / sizeof(u32)
 	} else {
 		sprintf(submitvalues->header, "%s%s%s%s%s%s", templ->version, templ->prevhash_be, submitvalues->merkleroot_be,
 			ntime, templ->nbits, nonce);
@@ -355,15 +359,11 @@ bool client_submit(YAAMP_CLIENT *client, json_value *json_params)
 		return false;
 	}
 
-	char extranonce2[32];
-	char ntime[32];
-	char nonce[32];
-	char vote[8];
-
-	memset(extranonce2, 0, 32);
-	memset(ntime, 0, 32);
-	memset(nonce, 0, 32);
-	memset(vote, 0, 8);
+	char extranonce2[32] = { 0 };
+	char extra[160] = { 0 };
+	char nonce[80] = { 0 };
+	char ntime[32] = { 0 };
+	char vote[8] = { 0 };
 
 	if (!json_params->u.array.values[1]->u.string.ptr || strlen(json_params->u.array.values[1]->u.string.ptr) > 32) {
 		clientlog(client, "bad json, wrong jobid len");
@@ -378,15 +378,28 @@ bool client_submit(YAAMP_CLIENT *client, json_value *json_params)
 	if (json_params->u.array.length == 6)
 		strncpy(vote, json_params->u.array.values[5]->u.string.ptr, 7);
 
-	if (g_debuglog_hash) {
-		debuglog("submit %s (uid %d) %d, %s, %s, %s\n", client->sock->ip, client->userid, jobid, extranonce2, ntime, nonce);
-	}
-
 	string_lower(extranonce2);
 	string_lower(ntime);
 	string_lower(nonce);
 	string_lower(vote);
 
+	if (json_params->u.array.length == 6) {
+		if (strstr(g_stratum_algo, "phi")) {
+			// lux optional field, smart contral root hashes (not mandatory on shares submit)
+			strncpy(extra, json_params->u.array.values[5]->u.string.ptr, 128);
+			string_lower(extra);
+		} else {
+			// heavycoin vote
+			strncpy(vote, json_params->u.array.values[5]->u.string.ptr, 7);
+			string_lower(vote);
+		}
+	}
+
+	if (g_debuglog_hash) {
+		debuglog("submit %s (uid %d) %d, %s, t=%s, n=%s, extra=%s\n", client->sock->ip, client->userid,
+			jobid, extranonce2, ntime, nonce, extra);
+	}
+
 	YAAMP_JOB *job = (YAAMP_JOB *)object_find(&g_list_job, jobid, true);
 	if(!job)
 	{
@@ -413,7 +426,7 @@ bool client_submit(YAAMP_CLIENT *client, json_value *json_params)
 
 	if(strcmp(ntime, templ->ntime))
 	{
-		if (!ntime_valid_range(ntime)) {
+		if (!ishexa(ntime, 8) || !ntime_valid_range(ntime)) {
 			client_submit_error(client, job, 23, "Invalid time rolling", extranonce2, ntime, nonce);
 			return true;
 		}
diff --git a/stratum/coind_template.cpp b/stratum/coind_template.cpp
index cca3ebf..33ecc62 100644
--- a/stratum/coind_template.cpp
+++ b/stratum/coind_template.cpp
@@ -333,6 +333,18 @@ YAAMP_JOB_TEMPLATE *coind_create_template(YAAMP_COIND *coind)
 		}
 	}
 
+	const char *sc_root = json_get_string(json_result, "stateroot");
+	const char *sc_utxo = json_get_string(json_result, "utxoroot");
+	if (sc_root && sc_utxo) {
+		// LUX Smart Contracts, 144-bytes block headers
+		strcpy(&templ->extradata_hex[ 0], sc_root); // 32-bytes hash (64 in hexa)
+		strcpy(&templ->extradata_hex[64], sc_utxo); // 32-bytes hash too
+
+		// same weird byte order as previousblockhash field
+		ser_string_be2(sc_root, &templ->extradata_be[ 0], 8);
+		ser_string_be2(sc_utxo, &templ->extradata_be[64], 8);
+	}
+
 	if (strcmp(coind->rpcencoding, "DCR") == 0) {
 		decred_fix_template(coind, templ, json_result);
 	}
diff --git a/stratum/job.h b/stratum/job.h
index 59657fc..aef4bdb 100644
--- a/stratum/job.h
+++ b/stratum/job.h
@@ -24,9 +24,13 @@ struct YAAMP_JOB_TEMPLATE
 	int created;
 	char flags[64];
 
-	char prevhash_hex[1024];
-	char prevhash_be[1024];
+	char prevhash_hex[512];
+	char prevhash_be[512];
 
+	char extradata_hex[512];
+	char extradata_be[512];
+
+	// todo: can use extra field
 	char claim_hex[128];
 	char claim_be[128];
 
diff --git a/stratum/job_send.cpp b/stratum/job_send.cpp
index 8ed6a23..5af3c72 100644
--- a/stratum/job_send.cpp
+++ b/stratum/job_send.cpp
@@ -16,14 +16,22 @@ static void job_mining_notify_buffer(YAAMP_JOB *job, char *buffer)
 {
 	YAAMP_JOB_TEMPLATE *templ = job->templ;
 
-	if (!strcmp(g_current_algo->name, "lbry")) {
+	if (!strcmp(g_stratum_algo, "lbry")) {
 		sprintf(buffer, "{\"id\":null,\"method\":\"mining.notify\",\"params\":["
 			"\"%x\",\"%s\",\"%s\",\"%s\",\"%s\",[%s],\"%s\",\"%s\",\"%s\",true]}\n",
 			job->id, templ->prevhash_be, templ->claim_be, templ->coinb1, templ->coinb2,
 			templ->txmerkles, templ->version, templ->nbits, templ->ntime);
 		return;
+	} else if (strlen(templ->extradata_hex) == 128) {
+		// LUX smart contract state hashes (like lbry extra field, here the 2 root hashes in one)
+		sprintf(buffer, "{\"id\":null,\"method\":\"mining.notify\",\"params\":["
+			"\"%x\",\"%s\",\"%s\",\"%s\",\"%s\",[%s],\"%s\",\"%s\",\"%s\",true]}\n",
+			job->id, templ->prevhash_be, templ->extradata_be, templ->coinb1, templ->coinb2,
+			templ->txmerkles, templ->version, templ->nbits, templ->ntime);
+		return;
 	}
 
+	// standard stratum
 	sprintf(buffer, "{\"id\":null,\"method\":\"mining.notify\",\"params\":[\"%x\",\"%s\",\"%s\",\"%s\",[%s],\"%s\",\"%s\",\"%s\",true]}\n",
 		job->id, templ->prevhash_be, templ->coinb1, templ->coinb2, templ->txmerkles, templ->version, templ->nbits, templ->ntime);
 }
diff --git a/stratum/remote_template.cpp b/stratum/remote_template.cpp
index 84fadc5..6235b70 100644
--- a/stratum/remote_template.cpp
+++ b/stratum/remote_template.cpp
@@ -62,7 +62,7 @@ void remote_create_job(YAAMP_REMOTE *remote, json_value *json_params)
 	YAAMP_JOB_TEMPLATE *templ = new YAAMP_JOB_TEMPLATE;
 	memset(templ, 0, sizeof(YAAMP_JOB_TEMPLATE));
 
-	strncpy(templ->prevhash_be, json_params->u.array.values[1]->u.string.ptr, 1023);
+	strncpy(templ->prevhash_be, json_params->u.array.values[1]->u.string.ptr, sizeof(templ->prevhash_be)-1);
 	strncpy(templ->coinb1, json_params->u.array.values[2]->u.string.ptr, 1023);
 	strncpy(templ->coinb2, json_params->u.array.values[3]->u.string.ptr, 1023);