X-Git-Url: https://git.novaco.in/?a=blobdiff_plain;f=Novacoin%2FCBlock.cs;h=450612aaca85c1ed9f6a3c6f940193ce6e3a0668;hb=f11201b1edaaabe33a256da25333f4f26f0cc136;hp=8ac3caded8933593814873fe2fb04ee1bccfcc4d;hpb=886861c2656fd556145c7d46a2002c169dacc2f6;p=NovacoinLibrary.git

diff --git a/Novacoin/CBlock.cs b/Novacoin/CBlock.cs
index 8ac3cad..450612a 100644
--- a/Novacoin/CBlock.cs
+++ b/Novacoin/CBlock.cs
@@ -52,6 +52,11 @@ namespace Novacoin
         /// </summary>
         public const uint nMaxBlockSize = 1000000;
 
+        /// <summary>
+        /// Sanity threshold for amount of sigops.
+        /// </summary>
+        public const uint nMaxSigOps = 20000;
+
 		/// <summary>
 		/// Block header.
 		/// </summary>
@@ -123,7 +128,7 @@ namespace Novacoin
 
         public bool CheckBlock(bool fCheckPOW = true, bool fCheckMerkleRoot = true, bool fCheckSig = true)
         {
-            var uniqueTX = new List<Hash256>(); // tx hashes
+            var uniqueTX = new List<uint256>(); // tx hashes
             uint nSigOps = 0; // total sigops
 
             // Basic sanity checkings
@@ -194,13 +199,13 @@ namespace Novacoin
                 }
 
                 // Check timestamp
-                if (header.nTime > NetUtils.FutureDrift(NetUtils.GetAdjustedTime()))
+                if (header.nTime > NetInfo.FutureDrift(NetInfo.GetAdjustedTime()))
                 {
                     return false;
                 }
 
                 // Check coinbase timestamp
-                if (header.nTime < NetUtils.PastDrift(vtx[0].nTime))
+                if (header.nTime < NetInfo.PastDrift(vtx[0].nTime))
                 {
                     return false;
                 }
@@ -250,7 +255,7 @@ namespace Novacoin
             }
 
             // Reject block if validation would consume too much resources.
-            if (nSigOps > 50000)
+            if (nSigOps > nMaxSigOps)
             {
                 return false;
             }
@@ -264,9 +269,24 @@ namespace Novacoin
             return true;
         }
 
-        private bool CheckProofOfWork(ScryptHash256 hash, uint nBits)
+        private static bool CheckProofOfWork(uint256 hash, uint nBits)
         {
-            // TODO: stub!
+            uint256 nTarget = new uint256();
+            nTarget.Compact = nBits;
+
+            // Check range
+            if (nTarget > NetInfo.nProofOfWorkLimit)
+            {
+                // nBits below minimum work
+                return false; 
+            }
+
+            // Check proof of work matches claimed amount
+            if (hash > nTarget)
+            {
+                //  hash doesn't match nBits
+                return false;
+            }
 
             return true;
         }
@@ -361,18 +381,18 @@ namespace Novacoin
         /// <summary>
         /// Serialized size
         /// </summary>
-        public int Size
+        public uint Size
         {
             get
             {
-                int nSize = 80 + VarInt.GetEncodedSize(vtx.Length); // CBlockHeader + NumTx
+                uint nSize = 80 + VarInt.GetEncodedSize(vtx.Length); // CBlockHeader + NumTx
 
                 foreach (var tx in vtx)
                 {
                     nSize += tx.Size;
                 }
 
-                nSize += VarInt.GetEncodedSize(signature.Length) + signature.Length;
+                nSize += VarInt.GetEncodedSize(signature.Length) + (uint)signature.Length;
 
                 return nSize;
             }
@@ -383,11 +403,11 @@ namespace Novacoin
         /// </summary>
         /// <param name="nTx">Transaction index.</param>
         /// <returns>Offset in bytes from the beginning of block header.</returns>
-        public int GetTxOffset(int nTx)
+        public uint GetTxOffset(int nTx)
         {
             Contract.Requires<ArgumentException>(nTx >= 0 && nTx < vtx.Length, "Transaction index you've specified is incorrect.");
 
-            int nOffset = 80 + VarInt.GetEncodedSize(vtx.Length); // CBlockHeader + NumTx
+            uint nOffset = 80 + VarInt.GetEncodedSize(vtx.Length); // CBlockHeader + NumTx
 
             for (int i = 0; i < nTx; i++)
             {
@@ -400,7 +420,7 @@ namespace Novacoin
         /// <summary>
         /// Merkle root
         /// </summary>
-        public Hash256 hashMerkleRoot
+        public uint256 hashMerkleRoot
         {
             get {
                 
@@ -408,7 +428,7 @@ namespace Novacoin
 
                 foreach (var tx in vtx)
                 {
-                    merkleTree.AddRange(Hash256.ComputeRaw256(tx));
+                    merkleTree.AddRange(CryptoUtils.ComputeHash256(tx));
                 }
 
                 int levelOffset = 0;
@@ -421,12 +441,12 @@ namespace Novacoin
                         var left = merkleTree.GetRange((levelOffset + nLeft) * 32, 32).ToArray();
                         var right = merkleTree.GetRange((levelOffset + nRight) * 32, 32).ToArray();
 
-                        merkleTree.AddRange(Hash256.ComputeRaw256(ref left, ref right));
+                        merkleTree.AddRange(CryptoUtils.ComputeHash256(ref left, ref right));
                     }
                     levelOffset += nLevelSize;
                 }
 
-                return (merkleTree.Count == 0) ? new Hash256() : new Hash256(merkleTree.GetRange(merkleTree.Count-32, 32).ToArray());
+                return (merkleTree.Count == 0) ? 0 : (uint256)merkleTree.GetRange(merkleTree.Count-32, 32).ToArray();
             }
         }
 
@@ -450,6 +470,130 @@ namespace Novacoin
             
             return sb.ToString();
         }
-	}
+
+        /// <summary>
+        /// Calculate proof-of-work reward.
+        /// </summary>
+        /// <param name="nBits">Packed difficulty representation.</param>
+        /// <param name="nFees">Amount of fees.</param>
+        /// <returns>Reward value.</returns>
+        public static ulong GetProofOfWorkReward(uint nBits, ulong nFees)
+        {
+            // NovaCoin: subsidy is cut in half every 64x multiply of PoW difficulty
+            // A reasonably continuous curve is used to avoid shock to market
+            // (nSubsidyLimit / nSubsidy) ** 6 == bnProofOfWorkLimit / bnTarget
+            //
+            // Human readable form:
+            //
+            // nSubsidy = 100 / (diff ^ 1/6)
+            //
+            // Please note that we're using bisection to find an approximate solutuion
+
+
+            uint256 nTarget = 0;
+            nTarget.Compact = nBits;
+
+            BigNum bnTarget = nTarget;
+            BigNum bnTargetLimit = NetInfo.nProofOfWorkLimit;
+
+            BigNum bnSubsidyLimit = NetInfo.nMaxMintProofOfWork;
+            BigNum bnLowerBound = CTransaction.nCent;
+            BigNum bnUpperBound = bnSubsidyLimit;
+
+            while (bnLowerBound + CTransaction.nCent <= bnUpperBound)
+            {
+                BigNum bnMidValue = (bnLowerBound + bnUpperBound) / 2;
+                if (bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnTargetLimit > bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnTarget)
+                    bnUpperBound = bnMidValue;
+                else
+                    bnLowerBound = bnMidValue;
+            }
+
+            ulong nSubsidy = bnUpperBound;
+            nSubsidy = (nSubsidy / CTransaction.nCent) * CTransaction.nCent;
+
+            return Math.Min(nSubsidy, NetInfo.nMaxMintProofOfWork) + nFees;
+        }
+
+        public static ulong GetProofOfStakeReward(ulong nCoinAge, uint nBits, uint nTime)
+        {
+            ulong nRewardCoinYear, nSubsidy, nSubsidyLimit = 10 * CTransaction.nCoin;
+
+            if (nTime > NetInfo.nDynamicStakeRewardTime)
+            {
+                // Stage 2 of emission process is PoS-based. It will be active on mainNet since 20 Jun 2013.
+
+                BigNum bnRewardCoinYearLimit = NetInfo.nMaxMintProofOfStake; // Base stake mint rate, 100% year interest
+
+                uint256 nTarget = 0;
+                nTarget.Compact = nBits;
+
+                BigNum bnTarget = nTarget;
+                BigNum bnTargetLimit = NetInfo.GetProofOfStakeLimit(0, nTime);
+
+                // NovaCoin: A reasonably continuous curve is used to avoid shock to market
+
+                BigNum bnLowerBound = CTransaction.nCent, // Lower interest bound is 1% per year
+                    bnUpperBound = bnRewardCoinYearLimit, // Upper interest bound is 100% per year
+                    bnMidPart, bnRewardPart;
+
+                while (bnLowerBound + CTransaction.nCent <= bnUpperBound)
+                {
+                    BigNum bnMidValue = (bnLowerBound + bnUpperBound) / 2;
+                    if (nTime < NetInfo.nStakeCurveSwitchTime)
+                    {
+                        //
+                        // Until 20 Oct 2013: reward for coin-year is cut in half every 64x multiply of PoS difficulty
+                        //
+                        // (nRewardCoinYearLimit / nRewardCoinYear) ** 6 == bnProofOfStakeLimit / bnTarget
+                        //
+                        // Human readable form: nRewardCoinYear = 1 / (posdiff ^ 1/6)
+                        //
+
+                        bnMidPart = bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue;
+                        bnRewardPart = bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit;
+                    }
+                    else
+                    {
+                        //
+                        // Since 20 Oct 2013: reward for coin-year is cut in half every 8x multiply of PoS difficulty
+                        //
+                        // (nRewardCoinYearLimit / nRewardCoinYear) ** 3 == bnProofOfStakeLimit / bnTarget
+                        //
+                        // Human readable form: nRewardCoinYear = 1 / (posdiff ^ 1/3)
+                        //
+
+                        bnMidPart = bnMidValue * bnMidValue * bnMidValue;
+                        bnRewardPart = bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit;
+                    }
+
+                    if (bnMidPart * bnTargetLimit > bnRewardPart * bnTarget)
+                        bnUpperBound = bnMidValue;
+                    else
+                        bnLowerBound = bnMidValue;
+                }
+
+                nRewardCoinYear = bnUpperBound;
+                nRewardCoinYear = Math.Min((nRewardCoinYear / CTransaction.nCent) * CTransaction.nCent, NetInfo.nMaxMintProofOfStake);
+            }
+            else
+            {
+                // Old creation amount per coin-year, 5% fixed stake mint rate
+                nRewardCoinYear = 5 * CTransaction.nCent;
+            }
+
+            nSubsidy = nCoinAge * nRewardCoinYear * 33 / (365 * 33 + 8);
+
+            // Set reasonable reward limit for large inputs since 20 Oct 2013
+            //
+            // This will stimulate large holders to use smaller inputs, that's good for the network protection
+            if (NetInfo.nStakeCurveSwitchTime < nTime)
+            {
+                nSubsidy = Math.Min(nSubsidy, nSubsidyLimit);
+            }
+
+            return nSubsidy;
+        }
+    }
 }