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 0xe4020b50f91a1bc255e23796fac1b936b232af21c4ce952db2866904e81ec795. Chain 2 (Bitcoin): anchored in block 954593 (2026-06-20T19:46:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd895172-535e-46f6-8d1c-ba73618c6ab7.json and https://artists.proofprofile.net/proofs/artist/bd895172-535e-46f6-8d1c-ba73618c6ab7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
01: Die geheimnisvollen Käfer (Club der 7 Siegel)
02: Die Koffer in der Gruft (Club der 7 Siegel)
03: Die gestohlenen Schriftrollen (Club der 7 Siegel)
04: Die rätselhafte Entführung (Club der 7 Siegel)
06: Chaos auf der Bühne (Club der 7 Siegel)