The answer
Solana transactions include a recent blockhash. A transaction using an expired blockhash may no longer be valid and must be rebuilt with a fresh one.
What to do next
Refresh or rebuild the transaction in the wallet and check the latest signature rather than repeatedly resending the old signed payload.
Solscan
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Ledger hardware wallet
A hardware signing device to compare for supported Solana assets; it does not fix Solana network, token or smart-contract faults.
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Frequently asked questions
Do Solana transaction signatures stay usable forever?
No. A normal transaction’s recent blockhash expires after a limited number of slots.