isBlockhashValid

The isBlockhashValid method checks whether a blockhash is still valid for transaction submission. This method is crucial for determining if a transaction with a specific blockhash can still be processed by the network, helping prevent transaction failures due to expired blockhashes.

Blockhashes in Solana have a limited validity window of approximately 60-90 seconds (roughly 150 blocks). Transactions that include expired blockhashes will be rejected by validators. Before resubmitting a transaction or when holding a transaction for delayed submission, it's important to verify the blockhash is still valid. This method provides that verification without needing to track block heights manually.

This method is essential for transaction retry logic, delayed transaction submission systems, batch processing applications that prepare transactions in advance, and any scenario where there's uncertainty about blockhash age. It prevents wasting network resources on transactions that will inevitably fail due to expired blockhashes and enables smarter retry strategies.

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Return Object

Request Example

Response Example

Tip: If value is false, fetch a new blockhash with getLatestBlockhash before submitting the transaction. Use 'processed' commitment for the freshest validity check. Blockhashes typically remain valid for ~60-90 seconds. Always check validity if more than 30 seconds have passed since fetching the blockhash.