Decentralized Devtax

src/hush_bitcoind.h

@@ -30,6 +30,7 @@ int32_t hush_voutupdate(bool fJustCheck,int32_t *isratificationp,int32_t notaryi
 bool EnsureWalletIsAvailable(bool avoidException);
 extern bool fRequestShutdown;
 extern CScript HUSH_EARLYTXID_SCRIPTPUB;
+extern std::string scriptpub_for_height(uint32_t nHeight);
 
 uint32_t hush_heightstamp(int32_t height);
 
@@ -1548,6 +1549,8 @@ bool hush_appendACscriptpub()
     static bool didinit = false;
     if ( didinit ) 
         return didinit;
+    // HUSH doesn't use earlytxid so we do not need this in this function
+    //ASSETCHAINS_SCRIPTPUB = scriptpub_for_height(height);
     if ( ASSETCHAINS_SCRIPTPUB[ASSETCHAINS_SCRIPTPUB.back()] == 49 && ASSETCHAINS_SCRIPTPUB[ASSETCHAINS_SCRIPTPUB.back()-1] == 51 )
     {
         CTransaction tx; uint256 blockhash; 
@@ -1616,6 +1619,7 @@ int64_t hush_checkcommission(CBlock *pblock,int32_t height)
     if(fDebug)
         fprintf(stderr,"%s at height=%d\n",__func__,height);
     int64_t checktoshis=0; uint8_t *script,scripthex[8192]; int32_t scriptlen,matched = 0; static bool didinit = false;
+    ASSETCHAINS_SCRIPTPUB = scriptpub_for_height(height);
     if ( ASSETCHAINS_COMMISSION != 0 || ASSETCHAINS_FOUNDERS_REWARD != 0 )
     {
         checktoshis = the_commission(pblock,height);
@@ -1728,6 +1732,7 @@ int32_t hush_checkPOW(int32_t slowflag,CBlock *pblock,int32_t height)
     }
     if ( failed == 0 && ASSETCHAINS_COMMISSION != 0 ) {
         if ( height == 1 ) {
+            ASSETCHAINS_SCRIPTPUB = scriptpub_for_height(height);
             if ( ASSETCHAINS_SCRIPTPUB.size() > 1 && ASSETCHAINS_SCRIPTPUB[ASSETCHAINS_SCRIPTPUB.back()] != 49 && ASSETCHAINS_SCRIPTPUB[ASSETCHAINS_SCRIPTPUB.back()-1] != 51 ) {
                 int32_t scriptlen; uint8_t scripthex[10000];
                 script = (uint8_t *)&pblock->vtx[0].vout[0].scriptPubKey[0];

src/hush_defs.h

@@ -54,6 +54,9 @@ const uint32_t nHushHardforkHeight2 = 245055;
 
 // This height begins Hush DPoW from Hush notaries
 const uint32_t nHushHardforkHeight3    = 340420;
+// This height begins Hush Decentralized Devtax
+const uint32_t nHushHardforkHeight4    = 99999999; // TODO
+
 const uint32_t nHushHardforkTimestamp  = 1580303652; // Jan 29nd 1pm GMT
 const uint32_t nHushHardforkTimestamp2 = 1594425600; // Jul 11th 12a GMT
 

src/hush_globals.h

@@ -280,3 +280,53 @@ uint64_t hush_current_supply(uint32_t nHeight)
     //fprintf(stderr,"cur_money %.8f\n",(double)cur_money/COIN);
     return(cur_money);
 }
+
+//TODO: production scriptpubs
+std::string DEVTAX_SCRIPTPUBS[20] = {
+"76a914f70a2e3df98d2befba431dfe01d4eaa3e418f68488ac",
+"76a914941907aa5f85952bc8deff20f1e50aa676a2d8dd88ac",
+"76a914f70a2e3df98d2befba431dfe01d4eaa3e418f68488ac",
+"76a914941907aa5f85952bc8deff20f1e50aa676a2d8dd88ac",
+"76a914f70a2e3df98d2befba431dfe01d4eaa3e418f68488ac",
+"76a914941907aa5f85952bc8deff20f1e50aa676a2d8dd88ac",
+"76a914f70a2e3df98d2befba431dfe01d4eaa3e418f68488ac",
+"76a914941907aa5f85952bc8deff20f1e50aa676a2d8dd88ac",
+"76a914f70a2e3df98d2befba431dfe01d4eaa3e418f68488ac",
+"76a914941907aa5f85952bc8deff20f1e50aa676a2d8dd88ac",
+"76a914f70a2e3df98d2befba431dfe01d4eaa3e418f68488ac",
+"76a914941907aa5f85952bc8deff20f1e50aa676a2d8dd88ac",
+"76a914f70a2e3df98d2befba431dfe01d4eaa3e418f68488ac",
+"76a914941907aa5f85952bc8deff20f1e50aa676a2d8dd88ac",
+"76a914f70a2e3df98d2befba431dfe01d4eaa3e418f68488ac",
+"76a914941907aa5f85952bc8deff20f1e50aa676a2d8dd88ac",
+"76a914f70a2e3df98d2befba431dfe01d4eaa3e418f68488ac",
+"76a914941907aa5f85952bc8deff20f1e50aa676a2d8dd88ac",
+"76a914f70a2e3df98d2befba431dfe01d4eaa3e418f68488ac",
+"76a914941907aa5f85952bc8deff20f1e50aa676a2d8dd88ac"
+ };
+
+// this is a deterministic consensus-changing function. All miners must be able
+// to predict the scriptpub for the next block
+std::string scriptpub_for_height(uint32_t nHeight) {
+    bool ishush3  = strncmp(SMART_CHAIN_SYMBOL, "HUSH3",5) == 0 ? true : false;
+    bool istush3  = strncmp(SMART_CHAIN_SYMBOL, "TUSH3",5) == 0 ? true : false;
+    // Fork height for HUSH3 mainnet needs to be decided just before code is merged
+    // Since it requires all full nodes on the network to have enough time to update.
+    // For testing, we choose an early blockheight so we can observe the value changing
+    // from the old fixed value to the new values which cycle
+    const int DEVTAX_FORK_HEIGHT = ishush3 ? nHushHardforkHeight4 : 5;
+
+    // Decentralized devtax is height-activated
+    if (nHeight >= DEVTAX_FORK_HEIGHT) {
+        if (ishush3 || istush3) {
+            // devtax_scriptpubs is an array of length 20 with 20 different scriptpubs
+            int NUM_SCRIPTPUBS = 20;
+            return DEVTAX_SCRIPTPUBS[ nHeight % NUM_SCRIPTPUBS ];
+        } else {
+        // if this is not HUSH3 or a testchain for HUSH3, return it unchanged
+        return ASSETCHAINS_SCRIPTPUB;
+        }
+    }
+    // return default unchanged if we are less than fork height
+    return ASSETCHAINS_SCRIPTPUB;
+}

src/hush_utils.h

@@ -1952,6 +1952,8 @@ void hush_args(char *argv0)
             ASSETCHAINS_SAPLING      = 1;
             // this corresponds to FR address RHushEyeDm7XwtaTWtyCbjGQumYyV8vMjn
             ASSETCHAINS_SCRIPTPUB       = "76a9145eb10cf64f2bab1b457f1f25e658526155928fac88ac";
+            // we do not want to change the magic of HUSH3 mainnet so we do not call scriptpub_for_height() here,
+            // instead we call it whenever ASSETCHAINS_SCRIPTPUB is used later on
 
             // Over-ride HUSH3 values from CLI params. Changing our blocktime to 75s changes things
             ASSETCHAINS_REWARD[0]     = 0;

src/miner.cpp

@@ -120,6 +120,7 @@ public:
 extern int8_t ASSETCHAINS_ADAPTIVEPOW;
 extern uint32_t ASSETCHAINS_RANDOMX;
 extern bool fRandomXDebug;
+extern std::string scriptpub_for_height(uint32_t nHeight);
 
 void UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev)
 {
@@ -630,6 +631,7 @@ CBlockTemplate* CreateNewBlock(CPubKey _pk,const CScript& _scriptPubKeyIn, int32
 
         pblock->vtx[0] = txNew;
 
+        ASSETCHAINS_SCRIPTPUB = scriptpub_for_height(nHeight);
         if ( nHeight > 1 && SMART_CHAIN_SYMBOL[0] != 0 && (ASSETCHAINS_OVERRIDE_PUBKEY33[0] != 0 || ASSETCHAINS_SCRIPTPUB.size() > 1) && (ASSETCHAINS_COMMISSION != 0 || ASSETCHAINS_FOUNDERS_REWARD != 0)  && (commission= the_commission((CBlock*)&pblocktemplate->block,(int32_t)nHeight)) != 0 )
         {
             int32_t i; uint8_t *ptr;
@@ -819,6 +821,7 @@ CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey, int32_t nHeight,
 {
     CPubKey pubkey; CScript scriptPubKey; uint8_t *script,*ptr; int32_t i,len;
     // fprintf(stderr,"%s: with nHeight=%d\n", __func__, nHeight);
+    ASSETCHAINS_SCRIPTPUB = scriptpub_for_height(nHeight);
     if ( nHeight == 1 && ASSETCHAINS_COMMISSION != 0 && ASSETCHAINS_SCRIPTPUB[ASSETCHAINS_SCRIPTPUB.back()] != 49 && ASSETCHAINS_SCRIPTPUB[ASSETCHAINS_SCRIPTPUB.back()-1] != 51 )
     {
         if ( ASSETCHAINS_OVERRIDE_PUBKEY33[0] != 0 )

src/rpc/mining.cpp

@@ -1036,6 +1036,8 @@ UniValue getblocksubsidy(const UniValue& params, bool fHelp, const CPubKey& mypk
     UniValue result(UniValue::VOBJ);
     result.push_back(Pair("miner", ValueFromAmount(nReward)));
     
+    // the value of ASSETCHAINS_SCRIPTPUB is not used here, this is just a check if it exists
+    // so we don't need to call scriptpub_for_height()
     if ( strlen(ASSETCHAINS_OVERRIDE_PUBKEY.c_str()) == 66 || ASSETCHAINS_SCRIPTPUB.size() > 1 )
     {
         if ( ASSETCHAINS_FOUNDERS == 0 && ASSETCHAINS_COMMISSION != 0 )