What to Record After Signing a DeFi Transaction
A simple record-keeping method for transaction hashes, permissions and follow-up checks.
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The moment a DeFi transaction is signed is the last moment you have complete information about it. Immediately afterward, context starts disappearing: the interface closes, the tab gets reused, the token name stops being visible, the address becomes a row of truncated characters, and the difference between the approval you granted and the swap you meant to make becomes unrecoverable. A short record written at signing time is the difference between reconstructing an event in ten minutes and having no way to prove it happened at all.
The failure mode this prevents is specific. Most incidents are not investigated because the user cannot state which contract they interacted with, on what date, or with what approval. Without those three facts, a protocol team cannot trace anything, an exchange cannot process a report, and you cannot tell whether a later exploit involved you.
The four things worth writing down
The transaction hash. The single highest-value item, and the one people lose first. It is the unique identifier for the transaction and it is the key to every external lookup. Copy it as text, not as a screenshot — screenshots lose characters to compression and resizing, and a hash with one wrong digit resolves to nothing.
The date and time, with the network. A date alone is not enough. The same wallet address is active on a dozen networks, and “I approved something in March” cannot be resolved without knowing which chain. Note local time and, if a dispute is likely, keep the block number too.
The protocol and the contract address. The name you recognized is not evidence; the contract address is. Sites impersonate each other and names get reused, and “the interface I used” becomes meaningless once the tab is gone. The address is verifiable, the name is a memory.
What you signed, in plain terms. Did you send tokens, swap them, bridge them, stake them, or grant an approval? This is the item that determines whether you need to act, and it is the item most often recorded as “a transaction” and therefore useless. An approval to move an unlimited amount of a token is a materially different event from a swap, even though both appear in the same list in the wallet.
Secondary items worth thirty seconds
The recipient or counterparty address, for anything that moved value. The amount and asset, written as a number and a symbol rather than a token name alone, because ticker symbols collide. The gas fee, which is small when nothing goes wrong and useful context when something does. And the interface you were in — a dApp, a wallet’s own swap screen, a hardware device display.
Two habits make this cheap. Record at the moment of signing rather than afterwards, while the details are on screen. And keep records in one place — a note file, a spreadsheet, a dedicated folder — because a record you cannot find is not a record.
Screenshots are worth taking, but as a supplement. They capture interface state that a hash cannot: the exact wording of a prompt, a claim about a protocol, a support conversation. They are not a substitute for the hash, because they cannot be verified and they lose fidelity.
Recording an approval differently from a swap
Approvals need their own record line because they behave differently. An approval does not move funds and is easy to overlook, yet it grants standing permission. For each approval, note the spender contract, the token, the allowance, and whether it is unlimited. Unlimited approvals — the default in most interfaces — mean the spender can move that entire token balance at any point in the future, and they persist until revoked.
If you ever need to answer “what did I sign,” the answer is not in your transaction list, because approvals are not transfers. It is in the permissions view of your wallet, or the approval checker on a block explorer, filtered by your address.
When to record more than usual
Some situations warrant a fuller record than a hash and a date. Anything involving a new protocol you have not used before. Anything where an interface asked for unusual permissions — a signature request in addition to a transaction, or an approval you did not expect. Anything where the transaction has not confirmed after a reasonable wait, because the pending state is worth capturing before it resolves either way. And anything that feels off, on the theory that your future self will not remember why.
The cost of a thorough record is under a minute. The cost of not having one is measured in an exchange support ticket that cannot proceed.
The retention question
Records have a shelf life too. Most block explorers keep full transaction data for a long time, but not forever, and third-party indexers that display token names and labels can disappear entirely. If a transaction matters for a dispute, a report or a tax question, save the details at the time rather than planning to reconstruct them.
What you keep should be enough for a stranger to act on: the hash, the network, the date, the contract, what you signed, and the counterparty. That set answers “did this happen,” “did it involve me,” and “who else needs to know” without further lookups.