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 0x2d736da0b607e8d007a6fc6ddd33ede3f6a57a93bd60ca202b92da28cd2f72b0. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8ceb89fd-1044-4552-b9f7-ebf4c2a4349c.json and https://artists.proofprofile.net/proofs/artist/8ceb89fd-1044-4552-b9f7-ebf4c2a4349c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Gott der Herr ist Sonn und Schild, BWV 79: IV. Rezitativ - Gottlob, wir wissen den rechten Weg (Bass) - Live
Bachkantate, BWV 79 - Gott der Herr ist Sonn und Schild (Live)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xb690c580830158d1a0bfa53d55412eabe9b872f4c38ad819920a4b2334c0b89f. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH9211700130.
Kantate zur Ratswahl, BWV 119 "Preise, Jerusalem, den Herrn": IV. Rezitativ. "So herrlich stehst du, liebe Stadt" (Bass)
Bachkantate, BWV 119 - Preise, Jerusalem, den Herrn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc17bcdc482a8c280b72b03819cb0dc168e5b6cf987d63cc885e2c03dfcbe0d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH9211100318.