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Improve comment explaining purpose of MAX_MONEY constant #6198

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Jun 1, 2015
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Improve comment explaining purpose of MAX_MONEY constant #6198

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10 changes: 9 additions & 1 deletion src/amount.h
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Expand Up @@ -16,7 +16,15 @@ typedef int64_t CAmount;
static const CAmount COIN = 100000000;
static const CAmount CENT = 1000000;

/** No amount larger than this (in satoshi) is valid */
/** No amount larger than this (in satoshi) is valid.
*
* Note that this constant is *not* the total money supply, which in Bitcoin
* currently happens to be less than 21,000,000 BTC for various reasons, but
* rather a sanity check. As this sanity check is used by consensus-critical
* validation code, the exact value of the MAX_MONEY constant is consensus
* critical; in unusual circumstances like a(nother) overflow bug that allowed
* for the creation of coins out of thin air modification could lead to a fork.
* */
static const CAmount MAX_MONEY = 21000000 * COIN;
inline bool MoneyRange(const CAmount& nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }

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