right|thumb|Astaroth illustration from the Dictionnaire Infernal (1818) by Louis Le Breton. In demonology, Astaroth (also Ashtaroth, Astarot and Astetoth) is an arch-demon. He is considered to be the
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 0xa554286e53fa8c067afc0b561e02994a8ba79df2e2e509fddea8f309847bb6c5. 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/5f5c2d6d-169f-441b-a00c-dc7eeb15a5c4.json and https://artists.proofprofile.net/proofs/artist/5f5c2d6d-169f-441b-a00c-dc7eeb15a5c4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).