thumb|300x300px|The Guibourg Mass by Henry de Malvost, from the book by Jules Bois, Paris, 1903 A Black Mass is a ceremony celebrated by various Satanic groups. It has allegedly existed for centuries
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 0x2c73c2c671bdd6f49548395d5e926be3ddb608b6f2e73733bd1dc16b8fa02f0b. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/24a969f1-b6cf-477d-a459-e89e6d7bfc15.json and https://artists.proofprofile.net/proofs/artist/24a969f1-b6cf-477d-a459-e89e6d7bfc15.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).