thumb|right|200px|Marcel Tournier Marcel Lucien Tournier (January 5, 1879 – May 8, 1951) was a French harpist, composer, and teacher who composed important solo repertory for the harp that expanded th
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 0x516abe7b5a02f6507900626f2ab94262ec7ac0a801dbb2f62b88ae37a51df184. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c64ce025-7d93-4182-ae4e-273e4c3f2442.json and https://artists.proofprofile.net/proofs/artist/c64ce025-7d93-4182-ae4e-273e4c3f2442.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Small River Flowing (Transcr. Y. Kondonassis)
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 0x6a974c6f61ae0d2ab701e2561990cef260a4dc0420b4166a4462cf04814f3ab6. 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/USTE10301488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe549063b14675358e31574c9b3f981192eacbd4fd3df697a2eeb598bf86f602. 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/DES380732016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fb69c0d23ac9d24fc20b982a007e78f8e1a787e3200dd064e55f98d1e181c0. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/USNE90813312.
Vers la source dans le bois (Towards the Fountain in the Wood)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621ef1f9757c15a5dbfd053f2f3bd9865b039c74170a27c8889147ed4569080c. 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/USNE90813313.
Harp Recital: Mcdonald, Susann - Salzedo, C. / Albeniz, M. / Albeniz, I. / Watkins, D. / Ortiz, A. / Francisque, A. (The World of the Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a82acf5618b9984e6435c303f11174381b9e551ea069213025d098c696787f7. 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/USASX0800511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8171536d6e95e068fdd64b29653329fe0dd4bd7d58d7ec04f50f064e3c71ddb0. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USASX0800512.
Images: Suite No. 3, Op. 35: Les Anesses grises sur la route d'El Azib
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6638f0e99f1790b54c7567fc6aafbf0080e84ed7b6287877ddc3810ddf6aaa. 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/HKI199908906.
Images: Suite No. 3, Op. 35: Danseuse a la fontaine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ec770bc4cb810dceaf2623f3b303dbb0e1b30c6186584fb24009900c8fb9a3. 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/HKI199908907.
Images: Suite No. 3, Op. 35: Soir de fete a Sedjenane
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2747c7240051459751c47ec2b210445b7eadbb78d9a8cfd58a5c8396441e24. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HKI199908908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0bd0b3e379fdfbd32e2d0a2e74fa845264c01dc51ba859dbd05e05e4e2ab0f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CAM232100018.