5ee157f43d
AdvanceNonceAccount instruction updates nonce to blockhash. This makes it possible that a durable transaction is executed twice both as a normal transaction and a nonce transaction if it uses blockhash (as opposed to nonce) for its recent_blockhash field. The commit prevents this double execution by separating nonce and blockhash domains; when advancing nonce account, blockhash is hashed with a fixed string. As a result a blockhash cannot be a valid nonce value; and if transaction was once executed as a normal transaction it cannot be re-executed as a durable transaction again and vice-versa. |
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