Blockhash-based transactions have a lifetime that are defined by the blockhash they include. Any transaction whose blockhash is too old will be rejected.
A recent blockhash
Optional
The transaction fee payer
the last block chain can advance to before tx is declared expired
One or more signatures
Blockhash-based transactions have a lifetime that are defined by the blockhash they include. Any transaction whose blockhash is too old will be rejected.