003, O03, 0O3, OO3 may refer to: 003, former emergency telephone number for the Norwegian ambulance service (until 1986) 1990 OO3, the asteroid 6131 Towen OO3 gauge model railway O03 (O2) and othe
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 0x9831d40f96d98da0b69a4aea5687fff2003a79a852f3528da80ab3192ac207c4. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ee9cf3ce-fed0-48b4-aa73-61f0a48ee1cd.json and https://artists.proofprofile.net/proofs/artist/ee9cf3ce-fed0-48b4-aa73-61f0a48ee1cd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).