Memoir
Understand an address
Which wallet is this address?
A public address does not tell you which wallet app someone uses or prove who owns it. A useful lookup separates four questions: which network has activity, what kind of account exists there, whether a public source labels it, and what the visible records actually show. Memoir checks Ethereum and Base; it does not search every blockchain.
Check a public address
Inspect Ethereum and Base activity, assets and public signals. No wallet connection or account needed.
An address, a wallet app and a network are different things
An Ethereum address is 0x followed by 40 hexadecimal characters. That format alone does not identify a wallet brand or a person's identity. A wallet is an interface to an account; the same account can be accessed through different compatible wallet applications. See Ethereum's explanations of accounts and wallets.
For a practical lookup, keep the network attached to every observation. A balance, public label or contract result on Base should not silently become a conclusion about Ethereum. Memoir shows those source results independently.
- “Which app?” An address lookup cannot reliably tell you whether it was accessed through MetaMask, a hardware-wallet interface or another app.
- “Which chain?” Look for dated account and activity observations on each supported network. No result is not proof of no activity elsewhere.
- “Who is it?” A public label is a source's attribution, not verified identity or proof of current control.
How to investigate an address you do not recognize
- Keep the original context. If you found it in a transfer, retain the transaction hash and the network shown by your wallet or explorer. A bare address loses that context.
- Open the public address in Memoir. Start with the account overview and the networks that returned observations. A source timeout means unknown, not empty.
- Inspect account facts and public signals separately. Contract verification, account state, community labels and security flags answer different questions. Open the cited source before repeating its claim.
- Check the relevant movement. Look at sender, recipient, asset contract, chain and time. A familiar token name, unsolicited receipt or interaction with a service does not establish ownership of the address.
- Write a bounded conclusion. For example: “This source labels this address on Base, checked at this time.” Do not turn it into “This person owns every matching address.”
For holdings, history and risk-source interpretation, continue with the crypto wallet analysis guide. For a missing receipt, use transaction successful but not received.
Worked example: one address, separate chain observations
Open the frozen Base bridge sample report for 0x4200000000000000000000000000000000000010. Read the editorial corrections first: its Ethereum index classification and Base contract verification describe different networks, not conflicting evidence about one shared account.
Compare the chain and source on each supporting fact. The report does not prove a common controller, that a deposit settled, or that this is a safe destination. This is a dated investigation example—not a recommendation to send funds to that address.
What an address lookup cannot recover
Can it find my lost wallet app or private key?
No. Memoir reads public evidence; it cannot restore keys, sign transactions, recover funds or discover all addresses you control. Never provide a recovery phrase or private key to an address checker.
What if I only have a Bitcoin or Solana address?
Use a source that supports that network. Memoir currently covers Ethereum and Base only; see coverage and failure states. It does not turn an unsupported address into an Ethereum account.
Can AI identify the owner for me?
AI can explain selected evidence and explicit public attributions. It must not invent identity from behavioral resemblance. Review the exact source, its date and the investigation boundaries before accepting an attribution.