Use chain magic as a unique starting value for randomx key

src/miner.cpp

@@ -1135,11 +1135,31 @@ void static RandomXMiner()
 
                 char randomxHash[RANDOMX_HASH_SIZE];
                 // TODO: decide on real RandomX key and input
-                const char randomxKey[]     = "HUSH RandomX testing key";
-                const char randomxInput[]   = "HUSH RandomX testing input";
+                char randomxKey[5];
+                randomxKey[0] = ASSETCHAINS_MAGIC & 0xff;
+                randomxKey[1] = (ASSETCHAINS_MAGIC >> 8) & 0xff;
+                randomxKey[2] = (ASSETCHAINS_MAGIC >> 16) & 0xff;
+                randomxKey[3] = (ASSETCHAINS_MAGIC >> 24) & 0xff;
+                randomxKey[4] = SMART_CHAIN_SYMBOL[0];
+
+                // crypto_generichash_blake2b_state state;
+                // CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
+                // ss << randomxKey;
+                // ss << SMART_CHAIN_SYMBOL;
+                // crypto_generichash_blake2b_update(&state, (unsigned char*)&ss[0], ss.size());
+                // char blakehash[32];
+                // crypto_generichash_blake2b_final(&state, blakehash, 32);
+
+                const char randomxInput[]   = "testing"; // blakehash[32];
                 randomx_flags flags         = randomx_get_flags();
                 randomx_cache *randomxCache = randomx_alloc_cache(flags);
 
+                if(Mining_height > 1) {
+                    // use blockchain data to set a new key+input for a group of blocks
+                    // randomxKey = ...
+                    // randomxInput = ...
+                }
+
                 if (randomxCache == NULL) {
                     LogPrintf("RandomX cache is null, something is wrong, cannot mine!\n");
                     return;