Runs in
On-chain bench
Hashed in this tab. No node is called and nothing is sent anywhere.
On-chain · Free now
Safe Transaction Hash
Work out the hash a Safe will ask its owners to sign, from the fields, offline. Then compare it against what your wallet shows.Your data stays in this tabGives you safeTxHash, Domain separator, Struct hash, Preimage
Safe Transaction Hash is ready for input.
Hashed in this tab. No node is called and nothing is sent anywhere.On-chain bench
Free nowNo upload0 selected · 0 BsafeTxHashDomain separatorStruct hash
Step 1
Set controls
Step 2
Run tool
Waiting for files and settings.
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Pick files and run the tool.
Notes
Safes hash the same transaction three different ways, depending on the release. Pick the version your Safe runs, or the hash will never match the wallet.
The four type hashes this uses are the constants the Safe contracts publish, and the gate checks our keccak reproduces each one rather than taking them on trust.
Operation 1 is a delegatecall, and gasToken with refundReceiver is how a Safe gets drained by a field that reads like plumbing. Both are called out below.
Workspace controls
Save a full workspace when you want the tool state, files, and team note preserved together.
Versions and sharing
Output versions appear here after successful runs so users can compare before exporting again.
Run detailsRunnable
What this tool does
Limit
Results depend on source quality and selected settings. The tool reports failures instead of silently claiming completion.
Input
No upload required; complete the visible controls. The same fields the Safe interface shows, and the hash they produce. Compare it against the one your wallet asks you to sign.
The Run button stays disabled until the required input is ready.
Output
safeTxHash, Domain separator, Struct hash, Preimage. Output names, file sizes, result notes, and downloads stay in the same workspace.
Results stay with the settings and source files used for the run.
If it fails
The workspace preserves staged settings, queue state, run progress, errors, retry, result versions, presets, and export bundles.
The console keeps the error and lets you retry the same setup.
Input readiness checkVisible run progressExplicit success or error stateDownload and rerun path
Inputs and features
Optional input
LimitedNothing to upload. Paste the hex or the JSON.
Camera capture
LimitedNot used by this tool group.
Clipboard paste
ReadyPaste calldata or a typed-data request straight from the wallet prompt.
Import package
ReadyRestore saved contract labels and signature notes.
Share setup
ReadyShare a decoded reading without sharing the wallet it came from.
Export package
ReadyDownload the decoded reading and its risk notes as TXT.
Saved workspacesPresetsRecent jobsRerun historyBatch queueProgress and ETACancel and retryMobile camera inputClipboard intakeCloud import and export
Language and help
4h first response
Related tools
Support notes
Support path
On-chain bench
4h first response
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Return to the folder view and jump into another app-style tool.
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Use it forAny Safe owner about to sign, and anyone reviewing a transaction somebody else proposed.
Good to knowA hardware wallet shows you 32 bytes and asks you to approve them. The only way to know those bytes are the transaction you think they are is to compute them somewhere else. This computes them somewhere else, and names the two fields that have emptied multisigs before.
- Safe
- Multisig
- EIP-712
- Delegatecall
- Offline
Where your data goesNowhere. The work happens in this tab.