888 commonly refers to: 888 (number), an integer 888 BC, a year of the 9th century BC AD 888, a year of the Julian calendar 888 or triple eight may also refer to: Telecommunication 888 is pre
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 0x097c1be7ddafbeba2900d1a7e53d8c3b7e4260a6ae619bf6022965dbcf99c900. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7239c01a-f749-4bec-8a13-d3d075e5a5cc.json and https://artists.proofprofile.net/proofs/artist/7239c01a-f749-4bec-8a13-d3d075e5a5cc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).