thumb|Bertrand Chamayou in 2010 Bertrand Chamayou (born 23 March 1981) is a French pianist.Pianistes du XXe siècle: critique, pédagogie, interprétation - Page 14 Danièle Pistone - 2007 "Où même ensuit
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 0x903875526ee151b878ef520e04788dfbb7a903cfd2aa072e1da848e7dfc31154. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/696b3fb0-029c-4197-915b-745063032dfd.json and https://artists.proofprofile.net/proofs/artist/696b3fb0-029c-4197-915b-745063032dfd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x20ea01b03327830eaafa60ec5290f2dc990f4f42532c60fed8de4f8035ab824e. 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/FR50X2200007.
Ravel: Miroirs, M. 43: III. Une barque sur l'océan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadeca60f1260090249734b27d9a0b4ef15d7f065e4ac72254ec518688ed97147. 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/GBAYC1503753.
Debussy: Piano Trio in G Major, CD 5, L. 5: III. Andante espressivo
Debussy: Clair de lune and Other Masterpieces
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2ed5d02c272bbfc54ba69b7606b3981fa1a676de83f93767b33cbd9f54f44e. 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/GBAYC1702017.
Miocheries, Op. 126: No. 13, La toute petite s'endort
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1071c7712fdd27c37966206d3612a713df3b8aea2e7b6719864c99781b5af46. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBAYC2001833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a6ab4f32834485462600034d7bd3eb56dbf92e41ebf56729d29e2b65bfb7e5. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/GBAYC1503748.
Soft Classical Music for Studying and Reading
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b311d2e0e7781b50935e1f36a2ebc1978145b5f3bafc53ec8b1dcd3b7f47231. 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/GBAYC2001828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3272a89f986cba3ab72518f4f2c93ce234ad5e4c91a45b07bb3e1a455a785e7f. 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/GBAYC2001829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131a1cf71ee98512e23f62492601029e7116295c16a92755094c18c66452347f. 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/GBAYC1702005.
Schubert / Arr. Liszt: Auf dem Wasser zu singen, Op. 72, D. 774
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccfc7eb60b31f3596385441259a585164b7811be464602a6d8472d80885c087. 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/GBAYC1302814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a6ab4f32834485462600034d7bd3eb56dbf92e41ebf56729d29e2b65bfb7e5. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GBAYC1503748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1273729c7d22bfe179080e54678704b59da75989bf5d1a707049d8a216102d87. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/GBAYC1503749.