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 0x1e5fa18e2b17ac0dbf784e1b9f0d6e3042b9bb223018c62df7f1901baae15474. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef13fed3-adcd-4dbe-bf14-d6de4ac1c4d1.json and https://artists.proofprofile.net/proofs/artist/ef13fed3-adcd-4dbe-bf14-d6de4ac1c4d1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Charpentier: Meditations Pour Le Careme / Grigny / Lebegue: Organ Works
Charpentier: Motets pour le Grand Dauphin
Organistes de cathédrales: Du Grand Siècle à l'orée des Lumières (Orgue J. Boizard à St Michel-en-Thiérache)
UGAB: L'univers de l'orgue - Luneville (France 1751)
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 0x9df2d5af68dcb60875b9119d10fdf0e6c6a81edfb4ec03842119ecd41a0ee6ca. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FRW959800901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce3986da26e165a27df40a1d17daa32231d65dfe046da349d9939dfd8571985. 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/FRW959800902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126310b37c1ed9b86579f093a0209280c2465ab2732fdcc0fd4ab60a5b46da3e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRW959800903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb814041aab97e2b6991b80249cb3656512010dd11c9698314b34438be957cf8. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FRW959800904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891ad27379221c89128ece33edfc299487c99f298a844ebc0e840523e14d2213. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FRW959800905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc6a9262d83d41d9197982009728ced30a7c4e9864470f8ce21a5120f739e1c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FRW959800914.