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 0xd88d7b1b25a806aec07b09200106ce68c77dd9c98e466b918dde4abd5e72d2e5. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44bffd96-46e0-40db-95c6-15dfa3cfd78c.json and https://artists.proofprofile.net/proofs/artist/44bffd96-46e0-40db-95c6-15dfa3cfd78c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).