text: // Copyright (c) 2019-2020 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef MONICOIN_SIGNET_H
  #define MONICOIN_SIGNET_H
  
  #include <consensus/params.h>
  #include <primitives/block.h>
  #include <primitives/transaction.h>
  
  #include <optional.h>
  
  /**
   * Extract signature and check whether a block has a valid solution
   */
  bool CheckSignetBlockSolution(const CBlock& block, const Consensus::Params& consensusParams);
  
  /**
   * Generate the signet tx corresponding to the given block
   *
   * The signet tx commits to everything in the block except:
   * 1. It hashes a modified merkle root with the signet signature removed.
   * 2. It skips the nonce.
   */
  class SignetTxs {
      template<class T1, class T2>
      SignetTxs(const T1& to_spend, const T2& to_sign) : m_to_spend{to_spend}, m_to_sign{to_sign} { }
  
  public:
      static Optional<SignetTxs> Create(const CBlock& block, const CScript& challenge);
  
      const CTransaction m_to_spend;
      const CTransaction m_to_sign;
  };
  
  #endif // MONICOIN_SIGNET_H
  