# OrangeCheck, sybil resistance from a Bitcoin signature

> Source: <https://ochk.io/>
> Published: 2026-06-16 01:12:30+00:00

>_ orangecheck // identity, on bitcoin

# You already have an account.It's your Bitcoin address — [claim it](#identity)

Sign one message to prove the address you already control — BIP-322, never a transaction. No password, no KYC, no custody.

✓ bip-322 identity✓ offline-verifiable✓ no custody · no KYC · no permission

§ the family

One signing primitive, composed nine ways. Each is independent — its own spec, its own site — and shares the same Bitcoin address as identity.

protocolsopen spec · MIT

[oc·attestsybil resistance · proof of bitcoin stake](https://attest.ochk.io)[oc·lockend-to-end encryption, addressed to a bitcoin address](https://lock.ochk.io)[oc·votestake-weighted, sybil-resistant polls](https://vote.ochk.io)[oc·stampbitcoin-block-anchored signed statements](https://stamp.ochk.io)[oc·agentscoped, revocable authority for agents](https://agent.ochk.io)[oc·pledgebonded commitments, verified by anyone](https://pledge.ochk.io)

productscommercial · bitcoin-bonded

§ open protocol, forever

No token, no issuer, no custody. Every artifact is a signed JSON envelope anyone can verify with a Bitcoin node and a BIP-322 verifier — shut us down tomorrow and your identity still checks out.

§ start

## One Bitcoin identity. Six protocols. Three products.

Open and MIT-licensed — read the spec, or claim your address and open the dashboard.