1  // Copyright (c) 2009-2010 Satoshi Nakamoto
 2  // Copyright (c) 2009-2021 The Bitcoin Core developers
 3  // Distributed under the MIT software license, see the accompanying
 4  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 5  
 6  #ifndef BITCOIN_CONSENSUS_AMOUNT_H
 7  #define BITCOIN_CONSENSUS_AMOUNT_H
 8  
 9  #include <cstdint>
10  
11  /** Amount in satoshis (Can be negative) */
12  typedef int64_t CAmount;
13  
14  /** The amount of satoshis in one BTC. */
15  static constexpr CAmount COIN = 100000000;
16  
17  /** No amount larger than this (in satoshi) is valid.
18   *
19   * Note that this constant is *not* the total money supply, which in Bitcoin
20   * currently happens to be less than 21,000,000 BTC for various reasons, but
21   * rather a sanity check. As this sanity check is used by consensus-critical
22   * validation code, the exact value of the MAX_MONEY constant is consensus
23   * critical; in unusual circumstances like a(nother) overflow bug that allowed
24   * for the creation of coins out of thin air modification could lead to a fork.
25   * */
26  static constexpr CAmount MAX_MONEY = 21000000 * COIN;
27  inline bool MoneyRange(const CAmount& nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
28  
29  #endif // BITCOIN_CONSENSUS_AMOUNT_H