Wallet and exchange forensic expert
I analyse who an address may belong to, with what degree of certainty, and whether an exchange statement matches what the blockchain records.
Member of AEPEJU (no. 1556). Barcelona and across Spain.
What the blockchain says and what it does not
The blockchain says which addresses moved which amounts and when; it does not say who is behind them.
That is why attributing an address to a person is done through indications, and each indication carries a different weight. A good report separates them and states the degree of certainty of each conclusion.
How an address is attributed
By combining what is visible on the chain with what is known outside it.
- Clustering by spending patterns: addresses used together in the same transaction usually belong to the same user.
- Public labels: known addresses of exchanges, protocols and services.
- Matches with external data: an address published on social media, on an invoice or in a chat.
- Exchange data: the strongest evidence, because it links the account to a verified identity.
Checking exchange statements against the chain
A statement is the exchange's version; the blockchain lets you check its external deposits and withdrawals.
I verify that every incoming and outgoing entry with a hash exists on the chain, with the same amount, date and address, and I point out anything that does not match. It is useful when the authenticity of a statement is disputed or when the other side submits screenshots instead of the original document.
Proving you own your wallet
If you need to show that an address is yours, it can be done without revealing your key.
The cleanest way is to sign a message with that address's key in front of the expert, who verifies and documents it. It serves to prove funds, for an inheritance or to show that you were the one who made a payment.
When it is needed
Whenever proceedings dispute who an address belongs to or whether a movement really happened.
- Scams and hacks, to link destination addresses to an exchange account.
- Inheritance and divorce, to establish which wallets belonged to whom.
- Disputes between partners over the funds of a crypto project.
- Crypto payments that one party denies having received.
What you receive
A signed expert report that can be defended in court.
- A map of addresses and their relationships, with the degree of certainty of each link.
- A transaction-by-transaction comparison between the statement and the chain.
- A message-signing record, if you are proving ownership of your own wallet.
- Bitcoin, Ethereum and its L2s (Arbitrum, Optimism and Base), and tokens such as USDT.
Frequently asked questions
Common questions about this kind of report.
Can you find out who owns a wallet?
Not with certainty from the blockchain alone. It can be attributed through indications, with their degree of certainty, and the exchange confirms the identity if the court requires it.
Can you check whether a wallet received a specific amount?
Yes. Every transaction is public: the amount, date and addresses are verified on a block explorer and documented in the report.
Is the exchange statement enough evidence?
It is usually strong evidence of ownership, because the exchange verifies its customers' identity. If it is challenged, checking it against the blockchain reinforces it.
Can you review the other side's blockchain report?
Yes. That is a rebuttal report: I check its transactions, its method and whether its conclusions go beyond what the data allow.
Can I prove an address is mine without giving my key?
Yes. You sign a message with that address's key in front of the expert; the signature is verified and the key never leaves your wallet.
Which chains do you analyse?
Bitcoin, Ethereum and its L2s (Arbitrum, Optimism and Base), and tokens such as USDT on those networks.
What do you need to start?
The disputed addresses or statement and a short explanation of the case. With that, in the free consultation, I assess what can be proven and with what degree of certainty.
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