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17 changes: 10 additions & 7 deletions src/txmempool.h
Original file line number Diff line number Diff line change
Expand Up @@ -328,14 +328,17 @@ struct TxMempoolInfo
};

/**
* CTxMemPool stores valid-according-to-the-current-best-chain
* transactions that may be included in the next block.
* CTxMemPool stores valid-according-to-the-current-best-chain transactions
* that may be included in the next block.
*
* Transactions are added when they are seen on the network
* (or created by the local node), but not all transactions seen
* are added to the pool: if a new transaction double-spends
* an input of a transaction in the pool, it is dropped,
* as are non-standard transactions.
* Transactions are added when they are seen on the network (or created by the
* local node), but not all transactions seen are added to the pool. For
* example, the following new transactions will not be added to the mempool:
* - a transaction which doesn't make the mimimum fee requirements.
* - a new transaction that double-spends an input of a transaction already in
* the pool where the new transaction does not meet the Replace-By-Fee
* requirements as defined in BIP 125.
* - a non-standard transaction.
*
* CTxMemPool::mapTx, and CTxMemPoolEntry bookkeeping:
*
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