B3ta (stylised as b3ta) is a popular British website, described as a "puerile digital arts community" by The Guardian. It was founded in 2001 by Rob Manuel, Denise Wilton and Cal Henderson. B3ta's m
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1443c70cc1a5bbb01bb8203bff111f2296ef4895418a72b5905a8ba9d2c2e8dc. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f374093f-01cd-4c2a-8d6d-e7880e34f598.json and https://artists.proofprofile.net/proofs/artist/f374093f-01cd-4c2a-8d6d-e7880e34f598.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).