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What your Solana signature actually authorizes
A Solana transaction contains a message and one or more signatures. The message identifies the fee payer, transaction lifetime value (normally a recent blockhash or, in some workflows, a durable nonce), account addresses, account permissions, the programs to invoke, the order of instructions, and each instruction’s data. A signature covers the serialized message bytes exactly.
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That distinction matters when a connected computer or decentralized application prepares the transaction. A screen can describe an action as “send tokens,” while the serialized message may include another instruction that changes an authority, grants an approval, or transfers assets to a different account. The signer does not certify the description supplied by the application; it signs the bytes presented to it.
Solana’s Partial Signing documentation states: “Every signature covers the serialized transaction message.” It also warns: “Do not deserialize a message, change it, and expect previously collected signatures to remain valid.” Any change to the message—including replacing the blockhash, changing the fee payer, reordering instructions, or changing account or instruction data—creates a different message that must be signed again.
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Prepare a frozen transaction for review
- Get the transaction from the intended source. Export or receive the unsigned transaction produced by the wallet, application, or coordinator. Do not rely only on a website’s human-readable summary.
- Preserve the exact bytes. Record the serialized message or the unsigned transaction in a way that lets you compare the same object before and after signing. Do not decode it, edit it, and then assume existing signatures still apply.
- Identify the transaction version. Confirm whether it is a legacy transaction or a version 0 transaction, and make sure the offline signer and wallet software support that version and the network you intend to use.
- Decode every field. Resolve account indexes and program identifiers into addresses, decode instruction data into concrete operations, and note which accounts are signers or writable.
- Compare with the trusted signer display. When a hardware device provides a human-readable review, compare its recipient, amount, fee, approvals, and other consequential fields with your independent decode.
- Stop if anything is opaque. A generic warning, “cannot decode,” unexplained instruction data, or missing recipient and amount is a blind-signing request. Do not approve merely because the application is familiar.
The connected computer can transport and display a transaction, but the offline device should be the place where you make the final approval decision. A hardware wallet keeps private-key material away from the computer; it cannot make an unreadable message safe.
Message fields to verify
| Field | What to check | Why it matters |
|---|---|---|
| Fee payer | Confirm the exact public key and the expected fee-paying arrangement. Verify that it is one of the required signers. | The fee payer is part of the signed message. A substitution changes who funds the transaction and changes the bytes being signed. |
| Recent blockhash or durable nonce | Check which lifetime mechanism is used and whether it remains valid for the time your offline workflow needs. | A normal recent blockhash expires. A delayed workflow may require a durable nonce, with its own consumption rules. |
| Transaction version | Confirm legacy or version 0 and verify support in the device, wallet, and network configuration. | A signer that cannot interpret the version or its account references may leave important data unreviewed. |
| Account addresses | Inspect every address, including the fee payer, program accounts, source and destination accounts, token accounts, authority accounts, and accounts marked writable. | An unexpected writable or authority account can allow an instruction to alter assets or permissions beyond the stated summary. |
| Signer and writable permissions | For each account, confirm whether it is required to sign, writable, both, or read-only, and whether that role is expected. | Permissions determine which accounts an instruction can authorize or modify. |
| Program IDs | Identify every program invoked and confirm that each is expected for the operation. | A transaction can call multiple programs. A familiar first instruction does not make later program calls safe. |
| Instruction sequence | Read instructions in order, including setup, approval, transfer, authority, and cleanup steps. | Order is part of the message. An extra instruction or a reordered sequence can change the result. |
| Instruction data | Decode operation type, amounts, mints, recipients, authorities, limits, and other parameters from the instruction data. | The data supplies the actual arguments. A label such as “swap” or “transfer” is not a substitute for those values. |
Read instructions as concrete actions
Transfers of SOL
For each SOL transfer, identify the source account, destination account, and exact lamport amount, then convert the amount into a unit you can reason about. Confirm that the destination is the intended public key and that no additional transfer instruction sends funds elsewhere. The fee payer may be different from the transfer source, so verify both roles separately.
SPL-token transfers
Token instructions normally reference token accounts as well as owner or authority accounts. Verify the token mint, source token account, destination token account, authority, and exact raw amount. Do not rely on a token symbol alone: similarly named assets can use different mint addresses. Confirm that the destination token account belongs to the recipient you expect and that any account-creation instruction is intentional.
Approvals and delegated authority
An approval can authorize a program or delegate to spend tokens later, even when the current transaction does not transfer the full balance. Check the approved delegate, mint or token account, amount or allowance, and any expiry or limit encoded by the instruction. If the purpose is a one-time transfer, an unexplained approval is a reason to stop and obtain a transaction that matches that purpose.
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Authority and account changes
Instructions that set an owner, close an account, freeze an account, change a mint authority, or otherwise modify control deserve the same scrutiny as a transfer. Confirm the current authority, the new authority, the affected account, and the program performing the change. Treat a transaction containing both a routine action and an authority change as a compound operation, not as a routine transfer.
Program interactions and swaps
A swap or application action may contain several instructions: approvals, transfers into a program-controlled account, a program call, and cleanup. Read the complete sequence. Verify every asset entering and leaving, the program ID, destination accounts, and any minimum-output or maximum-input values. A successful simulation only shows that the supplied instructions can execute under the simulated state; it does not prove that the instructions express your intent.
Use the hardware wallet’s display correctly
The device display is a second, trusted review surface, not a guarantee that the transaction is benign. Compare what it shows with your independent message decode. Important fields include the network, transaction type when available, fee payer or fee, recipients, token mint, amount, and any approval or authority change.
- Fully decoded: The device identifies the consequential operation and values clearly. Continue only after they match your intended action.
- Partially decoded: Some fields are understandable but one or more programs, accounts, amounts, or permissions remain unclear. Treat the transaction as unsafe to approve until you can explain every consequential field.
- Blind signing or opaque data: The device shows raw data, a generic warning, or says it cannot decode the transaction. Decline unless you have a separate, trustworthy process that lets you validate the exact bytes and accept the additional risk knowingly.
Ledger’s developer guidance, for example, recommends keeping blind signing off by default and warning when a transaction cannot be fully decoded. That is vendor-specific guidance, not a claim that every hardware wallet behaves identically. Device behavior varies with firmware, wallet software, network, transaction version, and the program being called.
Choose the right transaction lifetime for offline signing
A normal Solana recent blockhash has a finite validity period. If several people must review and sign offline, the blockhash can expire before submission. You cannot fix that signed transaction by replacing the old blockhash: doing so changes the message bytes and invalidates signatures already collected.
| Lifetime method | Advantages | Risks and required checks |
|---|---|---|
| Recent blockhash | Normal wallet flow; no separate nonce account or nonce-advance instruction. | Expires after a finite period. If it expires, rebuild the message with a new blockhash and collect all signatures again. |
| Durable nonce | Allows a transaction to be signed offline and submitted later using a stored nonce instead of a recent blockhash. | The nonce-advance instruction must be first. Once the nonce is advanced or consumed, the old signed transaction cannot be reused. Solana documentation notes that durable nonces may be deprecated in a future release, so check current wallet and network guidance before relying on them. |
Ask the coordinator which lifetime method is being used before signing. If the workflow uses a recent blockhash, establish who monitors expiry and how a replacement transaction will be distributed. If it uses a durable nonce, verify the nonce account, the first instruction, and the plan for preventing another transaction from consuming the nonce before yours is submitted.
Partial signing and post-signature verification
Offline signing is usually a sequence of partial-signature steps. One participant prepares the message, each required signer signs the same frozen bytes, and a coordinator assembles the signatures for submission.
- Freeze the message. Save the exact serialized message and record its expected transaction version, fee payer, lifetime value, and required signer public keys.
- Send only that message to the offline signer. Transfer it through the workflow you trust, without allowing an intermediary to silently rebuild it.
- Review and sign on the device. Confirm the device’s public key is the expected signer and reject any transaction whose consequential data is not understandable.
- Verify the returned signature cryptographically. Check the signature against the expected public key and the exact frozen message bytes. A signature from another key, or a signature over another serialization, is not interchangeable.
- Place the signature in the correct signer slot. Confirm that every required signer has a valid signature and that no signature was attached to the wrong account.
- Broadcast without rebuilding. Submit the assembled transaction exactly as signed. Do not deserialize, modify, refresh the blockhash, reorder instructions, or add a fee payer after signatures have been collected.
If any signature fails verification, discard the assembled transaction and investigate the message or transport process. Do not keep trying to submit a partially valid object or “repair” it by editing fields.
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Device and wallet compatibility checks
Before scheduling an offline signing session, confirm all of the following with the current official documentation for your device and wallet:
- Supported Solana network and account type.
- Support for the transaction version being used, including legacy or version 0 transactions.
- Whether the wallet can display every program and instruction in your transaction or will require blind signing.
- How the wallet handles blockhash expiry during review.
- Whether the workflow uses a durable nonce and supports the required nonce instructions.
- How signatures are exported, verified, and inserted into the final transaction.
Ledger’s Wallet Provider documentation describes one Ledger-specific approach for legacy and version 0 transactions: the provider displays the transaction for review, then fetches a fresh finalized recent blockhash after approval and signs the updated message. That behavior belongs to that provider workflow and should not be assumed for other wallets or offline processes. The Ledger product range includes devices such as Nano S Plus, Nano X, and Nano Gen5, but a model name alone does not establish that a particular transaction will be decoded or supported.
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The blockhash expires before all signatures are collected
Do not replace the blockhash in the already signed message. Have the coordinator create a new transaction, verify it from the beginning, and obtain every required signature again. For future long-running workflows, evaluate a durable nonce while accounting for its first-instruction and consumption rules.
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Cancel the approval. Obtain a transaction that the signer can decode, update compatible wallet or device software if appropriate, or use an independently verified signing process with an explicitly accepted blind-signing risk. Never infer the recipient or amount from the website’s summary when the device cannot show it.
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The decoded recipient or amount differs from the application screen
Reject the transaction and preserve both representations for investigation. A mismatch can indicate a malicious application, a stale interface, a wrong network, a token-account mix-up, or a transaction that contains additional instructions.
A signature verifies against a different message
Discard it. Compare the serialized bytes, transaction version, blockhash or nonce, fee payer, account ordering, and instruction data at each handoff. Collect a new signature over the final frozen message.
Simulation succeeds but the intent is uncertain
Do not treat simulation as approval. Simulation can demonstrate executable instructions under simulated conditions, but only message inspection establishes which programs, accounts, permissions, and values you are authorizing.
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A printable pre-signing checklist
- Source of the unsigned transaction is identified and trusted.
- Exact serialized message is saved and frozen.
- Legacy or version 0 format is supported by every participant.
- Fee payer address and fee-paying arrangement are correct.
- Recent blockhash or durable nonce is identified, with an expiry or consumption plan.
- Every program ID is expected.
- Every account address is recognized, including token accounts and authority accounts.
- Signer and writable permissions match the intended operation.
- Instructions are read in order, including setup and cleanup steps.
- SOL and token amounts, mints, recipients, allowances, and authority changes are exact.
- Hardware-wallet display matches the independent decode.
- No field is opaque, generic, or unexplained.
- Returned signatures verify against the expected public keys and the frozen message.
- All required signatures are present before broadcast.
- The final transaction will be submitted without any message change.
The practical security boundary
Offline signing reduces the chance that a connected computer can extract a private key, but it does not decide whether the transaction is economically or operationally safe. Intent verification remains your responsibility. The strongest workflow combines an independently decoded message, a clear hardware-wallet display, cryptographic signature checks, and a rule that any unexplained field causes rejection.
When those conditions cannot be met, the safe answer is not to sign and hope the application is honest. Ask for a transaction that can be fully inspected, rebuild it from a known source, or postpone the operation until the lifetime and compatibility issues are resolved.
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