thumb|Captain Sabertooth, a fictional pirate from a series of popular Norwegian theater plays for children Captain Sabertooth (in Norwegian: Kaptein Sabeltann) is a long running series that centers on
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3639100defe4445f32409700ecf4159dadf8176eee8c2e610335edc6335ce52. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8a71486d-cb25-40e0-8fd8-d0f7f7fa3184.json and https://artists.proofprofile.net/proofs/artist/8a71486d-cb25-40e0-8fd8-d0f7f7fa3184.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).