Minor Dogecoin consensus fixes

Updated maximum coins to match Dogecoin.
Updated protocol version to disable connections to pre-AuxPoW clients.
Disable version 2 block requirement
Update coinbase maturity to match Dogecoin

src/amount.h

@@ -17,7 +17,7 @@ static const CAmount COIN = 100000000;
 static const CAmount CENT = 1000000;
 
 /** No amount larger than this (in satoshi) is valid */
-static const CAmount MAX_MONEY = 21000000 * COIN;
+static const CAmount MAX_MONEY = 10000000000 * COIN; // Dogecoin: maximum of 100B coins (given some randomness), max transaction 10,000,000,000
 inline bool MoneyRange(const CAmount& nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
 
 /** Type-safe wrapper class to for fee rates

src/consensus/consensus.h

@@ -11,7 +11,11 @@ static const unsigned int MAX_BLOCK_SIZE = 1000000;
 /** The maximum allowed number of signature check operations in a block (network rule) */
 static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
 /** Coinbase transaction outputs can only be spent after this number of new blocks (network rule) */
-static const int COINBASE_MATURITY = 100;
+static const int COINBASE_MATURITY = 60*4; // 4 hours of blocks
+/** Coinbase maturity before block 145000 **/
+static const int COINBASE_MATURITY_OLD = 30;
+/** Block at which COINBASE_MATURITY_OLD was deprecated **/
+static const int COINBASE_MATURITY_SWITCH = 145000;
 /** Threshold for nLockTime: below this value it is interpreted as block number, otherwise as UNIX timestamp. */
 static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov  5 00:53:20 1985 UTC
 

src/main.cpp

@@ -1444,7 +1444,11 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
 
             // If prev is coinbase, check that it's matured
             if (coins->IsCoinBase()) {
-                if (nSpendHeight - coins->nHeight < COINBASE_MATURITY)
+                // Dogecoin: Switch maturity at depth 145,000
+                int nCoinbaseMaturity = coins->nHeight < COINBASE_MATURITY_SWITCH
+                    ? COINBASE_MATURITY_OLD
+                    : COINBASE_MATURITY;
+                if (nSpendHeight - coins->nHeight < nCoinbaseMaturity)
                     return state.Invalid(
                         error("CheckInputs(): tried to spend coinbase at depth %d", nSpendHeight - coins->nHeight),
                         REJECT_INVALID, "bad-txns-premature-spend-of-coinbase");
@@ -2783,9 +2787,10 @@ bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& sta
     }
 
     // Reject block.nVersion=1 blocks when 95% (75% on testnet) of the network has upgraded:
-    if (block.nVersion < 2 && IsSuperMajority(2, pindexPrev, consensusParams.nMajorityRejectBlockOutdated, consensusParams))
-        return state.Invalid(error("%s: rejected nVersion=1 block", __func__),
-                             REJECT_OBSOLETE, "bad-version");
+    // Dogecoin: Version 2 enforcement was never used
+    //if (block.nVersion < 2 && IsSuperMajority(2, pindexPrev, consensusParams.nMajorityRejectBlockOutdated, consensusParams))
+    //    return state.Invalid(error("%s: rejected nVersion=1 block", __func__),
+    //                         REJECT_OBSOLETE, "bad-version");
 
     // Reject block.nVersion=2 blocks when 95% (75% on testnet) of the network has upgraded:
     if (block.nVersion < 3 && IsSuperMajority(3, pindexPrev, consensusParams.nMajorityRejectBlockOutdated, consensusParams))

src/pow.cpp

@@ -12,22 +12,6 @@
 #include "uint256.h"
 #include "util.h"
 
-// Determine if the for the given block, a min difficulty setting applies
-bool AllowMinDifficultyForBlock(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params& params)
-{
-    // check if the chain allows minimum difficulty blocks
-    if (!params.fPowAllowMinDifficultyBlocks)
-        return false;
-
-    // Dogecoin: Magic number at which reset protocol switches
-    // check if we allow minimum difficulty at this block-height
-    if (pindexLast->nHeight < 157500)
-        return false;
-
-    // Allow for a minimum block time if the elapsed time > 2*nTargetSpacing
-    return (pblock->GetBlockTime() > pindexLast->GetBlockTime() + params.nPowTargetSpacing*2);
-}
-
 unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params& params)
 {
     unsigned int nProofOfWorkLimit = UintToArith256(params.powLimit).GetCompact();

src/rpcserver.cpp

@@ -126,7 +126,8 @@ static inline int64_t roundint64(double d)
 CAmount AmountFromValue(const Value& value)
 {
     double dAmount = value.get_real();
-    if (dAmount <= 0.0 || dAmount > 21000000.0)
+    double dMaxAmount = MAX_MONEY / COIN;
+    if (dAmount <= 0.0 || dAmount > dMaxAmount)
         throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount");
     CAmount nAmount = roundint64(dAmount * COIN);
     if (!MoneyRange(nAmount))

src/version.h

@@ -9,7 +9,7 @@
  * network protocol versioning
  */
 
-static const int PROTOCOL_VERSION = 70002;
+static const int PROTOCOL_VERSION = 70003;
 
 //! initial proto version, to be increased after version/verack negotiation
 static const int INIT_PROTO_VERSION = 209;
@@ -18,7 +18,7 @@ static const int INIT_PROTO_VERSION = 209;
 static const int GETHEADERS_VERSION = 31800;
 
 //! disconnect from peers older than this proto version
-static const int MIN_PEER_PROTO_VERSION = GETHEADERS_VERSION;
+static const int MIN_PEER_PROTO_VERSION = 70003;
 
 //! nTime field added to CAddress, starting with this version;
 //! if possible, avoid requesting addresses nodes older than this