Jolo () is a volcanic island in the southwest Philippines and the primary island of the province of Sulu, on which the capital of the same name is situated. It is located in the Sulu Archipelago, betw
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 0xe67cd35aa07d452de11205d40aee34bc5c60e353146c0e506897b14bdb03eb28. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/792eb901-8749-4ac6-86aa-14f292682b18.json and https://artists.proofprofile.net/proofs/artist/792eb901-8749-4ac6-86aa-14f292682b18.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).