thumb|Gaucelm Faidit and Guillelma Monja, from a manuscript in the Bibliothèque Nationale Gaucelm Faidit ( literally "Gaucelm the Dispossessed" c. 1156 – c. 1209) was a troubadour, born in Uzerche,
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1179a31c4de109d6c6f6e63501c5f1613c05b60c634fa410bdb3952ee23475. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3133f18a-e54e-45cd-9f71-f2cf49b291b2.json and https://artists.proofprofile.net/proofs/artist/3133f18a-e54e-45cd-9f71-f2cf49b291b2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Faidit: Troubadour Music from the 12th-13th Centuries
Faidit: Vos que'm semblatz dels corals amadors
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3c2de54b34f7120b2cea249ff6802bfefafc078ffa4b07f2cc2555f6f3e436. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEA340001586.
Trouvères et Troubadours : Aux origines de la chanson
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17216ad73d0a6f366728181098170d91c1536563181ea72bab5ef548b7e2b56. 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/FRZ092400168.
Richard Cœur de Lion, troubadours et trouvères
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf455dd74e4fcb1bd4042569bf37ff2b4b377770291e14b1e438f2f64af4cd5e6. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FR10S1758055.
Moyen Age: Musique instrumentale du moyen âge (Instrumental music of the Middle Ages)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a96b5581be0e54d2954f31de629513716f2f9a86909f5542dd18cfe6c753a5f. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:04:01Z), 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/CH1409807116.
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
Magna Melodia - Medieval Music From The Time Of The Magna Carta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4e870b416fd95559cc7d5c06eb57e191410e442072188f8e2ddc9694b29432. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/DELJ81590701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0fef55b6acbce75cc1d2464d3a117ab142452b5db02686a35a210aebb5c5ce. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBF077040714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9ddb45b80f692afc17e8c40aa66b006d8ccc2b8f84aada574e5b6dda30cf12. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DES382359001.