← onchainwho

Terms of Service

Effective 29 July 2026

onchainwho is operated by Hongkong Hongzhao Technology Limited (香港弘昭科技有限公司), a company registered in Hong Kong. Business Registration No. 77605835-000. Registered address: Rm 03, 24/F, Ho King Commercial Centre, 2–16 Fa Yuen Street, Mong Kok, Hong Kong. By using the service you agree to these terms.

1. What the service does

onchainwho reads transaction history on Ethereum, Base, Arbitrum, Optimism, Polygon, Avalanche, Hyperliquid, Solana, Tron and TON — ten chains. Which chains were read is printed on every result, and it is not decoration: an absence we did not check is not an absence, so the page states the scope of what it looked at alongside what it found.

BSC (chain 56) is a partial exception. No free source exists for its transaction history, so we cannot date activity there. We do check whether an address has ever been used on BSC — a nonce, a native balance, and stablecoin balances, all read from public nodes — and say so when it has. That check yields no timestamp of any kind, so a wallet active on BSC may be considerably older than the date shown.

For the same reason, the figure we print is labelled “oldest record found”and never “wallet age”. It is the earliest transaction we located on the chains we can read, which is a floor: the true history can be longer than the figure and can never be shorter.

You submit a public blockchain address, an ENS name or a Farcaster username. We query public sources and show you two things about that address: what its transaction history shows — when it first transacted, which address first sent it funds, and which addresses it transacts with most — and whatever identity its owner has published, such as an ENS name, a verified Farcaster account, the social links typed into those records, and the DAO governance spaces it has voted in.

2. What the screening lists cover

Every lookup compares the address, whoever funded it first, and its top counterparties against two lists. Both are shown whether or not they match, because a page that only speaks up on a match teaches its readers that silence means safe, and that is not something we can tell you.

Sanctions.Digital currency addresses designated by the US Treasury’s Office of Foreign Assets Control. A match is a government designation with a date, not an allegation of fraud — designated addresses include central banks under embargo. We read the list from a mirror that publishes it per chain, because OFAC’s own endpoints redirect to a host our servers cannot reach; the data is OFAC’s and the date shown is that mirror’s last update.

Phishing reports.ScamSniffer’s open blacklist of addresses observed collecting funds from phishing sites. This is a community report rather than a determination, and two limits matter: the free feed is published roughly a week behind its live counterpart, so it covers past campaigns well and current ones poorly, and it holds Ethereum-family addresses only — a Tron or TON address is never compared against it.

Between them these lists hold a few thousand addresses out of hundreds of millions in existence, so the overwhelmingly likely outcome is no match. A clean screen means those specific lists do not name this address. It is not a judgement about the address.

3. Where the data comes from

Every result comes from one of these public sources:

We do not buy data from brokers, use leaked or breached datasets, access private accounts, or process biometric information of any kind.

We do read transaction patterns, and an earlier version of these terms said otherwise. First funder and frequent counterparties are exactly that. They are shown as transactions, never as an identity, and no result here asserts that two addresses belong to the same person.

4. Accuracy — read this before relying on anything

Results are probabilistic and unverified. Every result is labelled by how it was established: cryptographically verified, self-declared by the address owner, or observed onchain. A self-declared link means someone typed it into their own record — it is not proof of identity, and anyone can type anything.

We do not confirm identity and we do not guarantee accuracy or completeness. Verify independently before acting on anything you see here.

5. Acceptable use

You may not use onchainwho to:

We may suspend access for any use that breaches this section.

6. Paid products

Three things are on sale, and they are not the same kind of work.

Both compile publicly available information and carry the same accuracy limits as section 3.

What you are buying is the conclusion of a search, not a guarantee of a match. A report has three possible outcomes and all three are delivered work:

Because every outcome is a delivered result, neither product is refundable on the basis that the answer was not the one you hoped for. If we fail to deliver at all, you are refunded in full.

Payment is taken through Stripe. For both products Stripe is the merchant of record and the order is sold through Link, so your statement will show LINK.COM* HONGZHAO TECH rather than onchainwho.

7. Removal

If information shown about you is wrong, or you want an address de-listed, email privacy@onchainwho.com. We action valid requests within 30 days. Note that we do not control the underlying public sources — removing an ENS text record at the source removes it here too.

8. Liability

The service is provided as-is. To the extent permitted by law we are not liable for decisions made in reliance on results, or for any indirect or consequential loss.

9. Changes

We will update the effective date above when these terms change. If the service starts processing a materially different kind of data, we will say so here before it does.

Questions or removal requests: privacy@onchainwho.com