thumb|Depiction of Bernart from fol. 15v of the Chansonnier BnF ms. 12473 Bernart de Ventadorn (also Bernard de Ventadour or Bernat del Ventadorn; – ) was an Occitan poet-composer troubadour of the
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 0x44e87f2233f4a56c0140265b9f6f022ace804b9461fe273b75d0498e82da2501. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/952c1068-2059-4469-9203-fd0eec04c15b.json and https://artists.proofprofile.net/proofs/artist/952c1068-2059-4469-9203-fd0eec04c15b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bernart de Ventadorn: The Testament of Tristan
De Ventadorn: Chantador de joi d'amour, Six Songs by the Troubadour
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 0x3d0247dc1ebc106c955117d1eca6c85c17170dd75c477ae13853b3a6b903b018. 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/NLQ662065101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd454c1e93749732d812ea494b548e14ed597b6fb31d608dc8103708ef7a9e211. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLQ662065105.
Can vei la lauzeta mover de joi sas alas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d056d2cde204694d72d4b25c1b9aa0b219bfa12ed205977dc5509436f8f40ed. 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/NLQ662065106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b93457163eb1aabb88775aebe3a57f8a1c6184342de5446d9aa2fdf1f37aefd. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BER181334007.
Condesa de Dia: Ab joi et ab joven m'apais
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3dcd8577fd2f8272d79ebc4864df092c1de1e4738cb5872ddf2c10e982c608. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/DEA340001590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3dcd8577fd2f8272d79ebc4864df092c1de1e4738cb5872ddf2c10e982c608. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/DEA340001590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f72a225c87ded255905caf85a3cfdf14907097a72bd9135db475dccd6e54ca2. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEB338836806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b71e3a7907ee26b7f8c168103f0647af90bdd065d255272a6c2bb40e69bed1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRPZ92314850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9a4ffb94911f43c08e1b91e0ad1203f86e2e7e7e1a0791f7c06d35f1bb06c8. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FRZ147704010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd6ef03ccfa3de6349c5ba0d91c8ef9f36531c2197b213e994e27885aaf1951. 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/FRZ147704020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2f793e360cb455752059b7305af302c398310c8b9dd312ebea0ffaed0e1ea0. 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/GBAJY8409402.