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A delayed Solana transaction is not automatically a failed transaction. First save the transaction signature, identify the cluster, and determine whether the message uses an ordinary recent blockhash or a durable nonce. Then check the original signature on that same cluster. If a recent blockhash is still within its validity window, rebroadcast the exact same signed bytes. If the blockhash has expired, verify that the original did not execute before rebuilding and collecting signatures for a new message. Durable-nonce transactions follow different rules: the nonce can be used only once, and a nonce that has advanced cannot be reused.
An RPC response from sendTransaction proves only that an RPC node received the submission and returned a signature. It does not prove inclusion, confirmation, successful instruction execution, or finality.
Why is my Solana transaction pending?
Wallets commonly display a spinner or a pending label while the transaction is being forwarded, waiting for a leader, or waiting for the wallet to observe a confirmed status. Those interface states are not protocol evidence. A request can time out after the RPC accepted it, an explorer can index it later than the chain, and an RPC node can be temporarily behind the cluster.
Solana transactions have two separate questions:
- Was the signed transaction included and processed? This is answered by looking up its signature on the correct cluster.
- Did every instruction succeed? A processed transaction can still contain an execution error. In that case, ordinary instruction state changes are rolled back, although transaction fees can still be charged.
Do not create a replacement merely because a wallet says “failed,” a submission call timed out, or an explorer has not found the signature yet. A replacement can execute the same action twice if the original remains valid.
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Step 1: Preserve the transaction identity before doing anything else
- Copy the exact transaction signature. It is the base58 identifier returned by the submission call or shown by the signing application. Preserve it exactly; one missing or changed character points to a different transaction.
- Record the cluster. Mainnet-beta, devnet, and testnet have separate ledgers. A valid signature on one cluster will not appear on another.
- Determine the lifetime mechanism. Note whether the message used a recent blockhash from a blockhash-fetch call or a stored durable nonce value. If you built the transaction offline, retain the serialized signed bytes, the blockhash response, and the nonce-account information.
- Record the commitment used by your application. The commitment used to fetch a blockhash and run preflight should be compatible with the commitment used when checking the result. Solana’s confirmation guidance generally favors confirmed commitment for operational checks.
Keep the original signed payload unchanged. It is the only artifact that lets you safely rebroadcast the same transaction and preserve its original signature.
How do I check a Solana transaction?
Use an explorer on the same cluster
Paste the signature into a trusted Solana explorer and explicitly select the cluster if the explorer supports multiple networks. Look for the slot, confirmation status, fee, instruction result, and program error. “Not found” means only that the selected service has not located the signature; it is not proof that the transaction never reached an RPC node.
Check status through RPC
For a programmatic check, call getSignatureStatuses with the original signature. Requesting transaction history can find signatures that are no longer in the node’s short recent cache:
connection.getSignatureStatuses([signature], {searchTransactionHistory: true})Interpret the returned entry as follows:
null: this RPC has no status for the signature in the searched range. Try again against a healthy RPC on the same cluster and verify the signature text.err: null: the transaction executed without a reported instruction error. The confirmation level still tells you how strongly the result has been observed.- A non-null
err: the transaction was processed but failed during execution. Inspect the complete transaction and the program-specific error before attempting another transaction. confirmationStatus: use the reported processed, confirmed, or finalized level according to the assurance your application needs. A submission response alone supplies none of this execution evidence.
When status is missing, check the original signature repeatedly while its lifetime remains possible. Use the same cluster and avoid switching between commitment levels without understanding the resulting lag.
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Recent blockhash transactions: the normal recovery path
How long is a recent blockhash valid?
Recent-blockhash validity is measured in slots and block height, not by a guaranteed wall-clock timer. Solana documentation describes a recent processing window of 150 slots. Under typical slot timing, the confirmation guide characterizes this as approximately 60–90 seconds, but congestion, skipped slots, and timing differences make that only an estimate.
When obtaining a blockhash, save both values returned by the call: blockhash and lastValidBlockHeight. The blockhash identifies the value embedded in the message; lastValidBlockHeight gives you the protocol boundary used to determine expiry.
How do I tell whether the blockhash has expired?
Fetch the current block height at a compatible confirmed commitment with getBlockHeight. Compare it with the saved limit:
- If the current confirmed block height is less than or equal to
lastValidBlockHeight, the transaction may still be accepted. - If the current confirmed block height is greater than
lastValidBlockHeight, the recent-blockhash transaction has expired and cannot be processed with that blockhash.
The comparison is more reliable than estimating elapsed seconds. A “blockhash not found” response can indicate genuine expiry, but it can also result from RPC lag or a commitment mismatch between the blockhash request, preflight, and status check.
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Can I resend a failed Solana transaction?
You can rebroadcast the same transaction while its recent blockhash remains valid, provided you have not established that it already executed. Rebroadcast the original fully signed serialized bytes through sendRawTransaction; do not reconstruct the instructions and do not sign a replacement yet. Continue checking the original signature, because rebroadcasting does not create a new transaction identity.
This is safe because every submission is byte-for-byte the same message and therefore has the same signature. It also avoids collecting signatures again in an offline workflow.
Do not send a newly signed transaction with a fresh blockhash while the original may still be valid. Both messages can be accepted, and both can perform the action. This is particularly dangerous for transfers, swaps, account creation, and any instruction that is not naturally idempotent.
Exact recovery procedure while the blockhash is valid
- Use
getSignatureStatusesto check the original signature with transaction history enabled. - If the status shows successful execution, stop. Do not send another transaction.
- If the status shows an execution error, inspect the program error. Repeating the same bytes will reproduce the same failure.
- If the status is unavailable and confirmed block height has not passed
lastValidBlockHeight, rebroadcast the identical serialized bytes. - Wait briefly, then check the original signature again. Repeat only while the saved blockhash remains valid and no successful result has appeared.
- If the block height passes the limit, stop rebroadcasting and perform the expiry check described below.
How do I fix an expired blockhash?
You cannot repair an expired recent blockhash inside an already signed payload. Signatures cover the serialized message, including the blockhash. Replacing only the blockhash makes the old signatures invalid.
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Rebuild only after checking the original signature
- Confirm that the current confirmed block height is greater than the saved
lastValidBlockHeight. - Query the original signature one more time on the correct cluster, preferably with transaction history enabled. A delayed index or RPC response can otherwise make an executed transaction look absent.
- If the original executed successfully, do not rebuild.
- If it did not execute, fetch a fresh blockhash and its new
lastValidBlockHeight. - Recreate the message with the same intended instructions, accounts, fee payer, and any current account data required by the program.
- Have every required signer sign the new message. The fresh blockhash creates a different message and therefore requires fresh signatures from all signers.
- Submit the newly serialized transaction and retain its new signature and lifetime values.
An offline multi-signer process can expire while signatures are being collected. If that happens, discard the incomplete signed message, obtain a fresh blockhash, rebuild, and collect all signatures again. A hardware signing device can be used as one signer when it signs the exact message bytes; its use does not change the blockhash rules or reverse an earlier transaction.
Durable nonce transactions work differently
What a durable nonce changes
A durable nonce transaction uses the stored nonce value from a nonce account as the message’s recent_blockhash. Its first instruction must advance that nonce account. This design allows a transaction to be signed offline and submitted after the ordinary recent-blockhash window has passed.
Before submitting a delayed transaction, read the nonce account and compare its current stored nonce with the value embedded in the signed message. This check is essential: a nonce value is single-use, not a reusable long-lived blockhash.
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What happens if my Solana durable nonce was used?
If the nonce account has advanced, the old signed transaction cannot be submitted again. Refetch the account’s current nonce and build a new transaction with that value. All required signers must sign the new message.
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Nonce processing has an important ordering rule. A transaction that passes nonce validation advances the nonce before its other instructions execute:
- If all instructions succeed, the nonce advances and the transaction’s state changes are committed.
- If a later instruction fails, ordinary instruction state changes are rolled back, but the nonce remains advanced and the fee payer is charged. The old transaction is still consumed; create a new transaction with the current nonce after diagnosing the program error.
- If nonce validation itself fails—for example, the nonce account is missing, the nonce was already used, or required nonce-authority signing is absent—the transaction is dropped without fees or state changes under the current documented behavior.
Solana’s “Durable Nonces” documentation warns: “Durable nonces may be deprecated in a future release.” Verify current protocol support before designing a new workflow around them.
Durable-nonce recovery procedure
- Save the original signature, cluster, serialized bytes, nonce-account address, and nonce value used in the message.
- Read the nonce account on the same cluster.
- If its stored nonce still matches the message and the signature has no successful status, submit the identical signed bytes and monitor the original signature.
- If the stored nonce has advanced, do not rebroadcast the old bytes. Check the original signature to distinguish a successful or failed execution from a validation drop.
- For a consumed nonce, fetch the current nonce, review any execution error, rebuild the transaction, and collect new signatures.
Common symptoms and the correct response
| Symptom | What it can mean | Safe response |
|---|---|---|
| RPC timeout or no submission result | The request may have reached the RPC even though the client did not receive a response. | Use the saved signature if one exists; check status and rebroadcast identical bytes while the lifetime is valid. |
| “Blockhash not found” | The blockhash may be expired, or the RPC may be lagging or using a mismatched commitment. | Compare confirmed block height with the saved limit, retry against a synchronized RPC, and align blockhash, preflight, and status commitments. |
Status is null |
The queried RPC has not found the signature in its available history. | Verify the cluster and signature, enable transaction-history search, and query another reliable RPC before rebuilding. |
| Non-null transaction error | The transaction reached execution but a program or instruction failed. | Inspect logs and the program error. State changes normally roll back, but fees may be charged; fix the cause before creating a new message. |
| Explorer still shows pending | Indexing or confirmation may lag behind the cluster. | Use RPC status and block-height evidence rather than the wallet label alone. |
| Offline signatures took too long | A normal recent blockhash expired before the final signature or submission. | Check the original signature, then rebuild with a fresh blockhash and recollect signatures. Plan a supported durable-nonce flow for future long delays. |
| Durable nonce no longer matches | The nonce was consumed by an earlier valid nonce transaction. | Do not resend the old payload. Read the current nonce, diagnose the first transaction, and sign a new message. |
Recent blockhash versus durable nonce
| Property | Recent blockhash | Durable nonce |
|---|---|---|
| Validity period | Bounded recent-processing window: 150 slots, approximately 60–90 seconds under typical timing. | Designed for submission after that ordinary window, as long as the stored nonce remains current. |
| Expiry or reuse evidence | Compare confirmed getBlockHeight with the saved lastValidBlockHeight, then check the signature. |
Read the nonce account and compare its stored value with the transaction’s nonce, then check the signature. |
| Can the same signed bytes be retried? | Yes, while the blockhash remains valid and the transaction has not executed. | Only while the nonce remains unused and validation conditions still hold. |
| What happens after consumption? | After expiry, rebuild with a fresh blockhash and obtain new signatures. | An advanced nonce makes the old message unusable; rebuild with the current nonce and new signatures. |
| Failure after validation | Instruction state changes roll back; fees may still be charged. | Instruction state changes roll back, but the nonce remains advanced and the fee is charged. |
| Validation failure | The transaction is not accepted with an invalid or expired blockhash. | Current documentation describes nonce-validation drops as producing no fee and no state change. |
How to avoid duplicate actions during recovery
- Keep one record containing the signature, cluster, serialized bytes, lifetime mechanism, blockhash or nonce, and fee payer.
- Use the original signature as the primary identity, not a wallet status message.
- Never alter instructions, accounts, amounts, or the blockhash in a signed payload and then reuse old signatures.
- Do not launch a fresh transaction until the original recent-blockhash message has expired or the durable nonce has been consumed and the original status has been checked.
- For retryable application operations, design program-level idempotency where possible, such as a unique operation identifier or an account state check.
- Set the same sensible commitment for blockhash retrieval, preflight, and confirmation checks so that an RPC does not evaluate the transaction against inconsistent views.
- For long offline signing sessions, measure the expected signature-collection delay. A normal recent blockhash may expire before the last signer finishes.
A compact decision tree
- Do you have the original signature? If not, recover it from the signer or submission log before making another payment or state-changing attempt.
- Is the cluster known? Query the exact network used for signing and submission.
- Does the signature show success? Stop; the action executed.
- Does it show an execution error? Stop resending identical bytes and fix the program-level cause.
- Was a recent blockhash used? Compare confirmed block height with
lastValidBlockHeight. If still valid, rebroadcast identical bytes; if expired, check status once more and then rebuild only if it did not execute. - Was a durable nonce used? Compare the nonce account with the embedded nonce. If unchanged, the same bytes may still be submitted; if advanced, the old message is consumed and a new transaction is required.
This sequence separates transport uncertainty, expiry, execution failure, and nonce consumption—the four cases that look alike in a wallet but require different actions.
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