text: // Copyright (c) 2012-2013 The RADICAL developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  #ifndef RADICAL_KERNEL_H
  #define RADICAL_KERNEL_H
  
  #include "main.h"
  
  // MODIFIER_INTERVAL: time to elapse before new modifier is computed
  extern unsigned int nModifierInterval;
  
  // MODIFIER_INTERVAL_RATIO:
  // ratio of group interval length between the last group and the first group
  static const int MODIFIER_INTERVAL_RATIO = 3;
  
  // Compute the hash modifier for proof-of-stake
  bool ComputeNextStakeModifier(const CBlockIndex* pindexPrev, uint64_t& nStakeModifier, bool& fGeneratedStakeModifier);
  
  // Check whether stake kernel meets hash target
  // Sets hashProofOfStake on success return
  bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned int nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, unsigned int nTimeTx, uint256& hashProofOfStake, uint256& targetProofOfStake, bool fPrintProofOfStake=false);
  
  // Check kernel hash target and coinstake signature
  // Sets hashProofOfStake on success return
  bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake);
  
  // Check whether the coinstake timestamp meets protocol
  bool CheckCoinStakeTimestamp(int64_t nTimeBlock, int64_t nTimeTx);
  
  // Get stake modifier checksum
  unsigned int GetStakeModifierChecksum(const CBlockIndex* pindex);
  
  // Check stake modifier hard checkpoints
  bool CheckStakeModifierCheckpoints(int nHeight, unsigned int nStakeModifierChecksum);
  
  // Get time weight using supplied timestamps
  int64_t GetWeight(int64_t nIntervalBeginning, int64_t nIntervalEnd);
  
  #endif // PPCOIN_KERNEL_H
  