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 0x515a18791c4cf4fe6468b20839a28d2fe92329f4ddf3a89fc8c34816dfab9c0f. 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/5c384e71-b180-441b-8eee-513ad86f64e3.json and https://artists.proofprofile.net/proofs/artist/5c384e71-b180-441b-8eee-513ad86f64e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach, JS: Matthäus-Passion, BWV 244, Pt. 2: No. 33, Rezitativ. "Und wiewohl viel falsche"
Theo Altmeyer/Franz Crass/Teresa Zylis-Gara/Julia Hamari/Nicolai Gedda/Hermann Prey/Hans Sotin/Süddeutscher Madrigalchor/Consortium Musicum/Wolfgang Gönnenwein
Bach: Matthäus-Passion BWV 244 [St. Matthew Passion]
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 0xb04b4a2ab7ba6441207e22bb82f181aea27840e4a657d1058d3dbc0026409606. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEA340702480.
La Passion selon Saint-Matthieu, BWV 244: Récit. "Du lieber Heiland du"
Bach J.S.: La Passion selon Saint-Matthieu, BWV 244
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaee6aecb23fa272209622b84b0400150693355a0f398373d9b2f3bb76a82e77. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/FRZ178104700.
La Passion selon Saint-Matthieu, BWV 244: Air. "Buss und Reu"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cc62121ee647a6a1cfd6e739440f0c4019491dfa95f899f2e372a91b306eaf. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FRZ178104710.
La Passion selon Saint-Matthieu, BWV 244: Air. "Erbarme dich"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8109391076ae5621a92dd369653dbb45b596f736901c7e5eae7dc279be5186c4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FRZ178105080.