04 may refer to The year 2004, or any year ending with 04 The month of April 4 (number) 04 (Six by Seven album) 04 (Urban Zakapa album) 04, department number of Alpes-de-Haute-Provence, France
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 0x8f0e2689e39381dc3496a3d5af101873a900f972d6fdc7251393aed2f2c688d0. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f0b4a06-6cde-494a-bbf6-4b2fc0c14072.json and https://artists.proofprofile.net/proofs/artist/0f0b4a06-6cde-494a-bbf6-4b2fc0c14072.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).