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 0xe6ffb659676b7460e430cf8cc86e947d17c051c3611156b02424b8d8b93acf12. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/98a5111a-075c-4e09-868a-bf2545593464.json and https://artists.proofprofile.net/proofs/artist/98a5111a-075c-4e09-868a-bf2545593464.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Die Kunst der Fuge, BWV 1080: Contrapunctus I
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 0x03d4bc87d264e4977773f3b031b370da2bd0c5d87787591641382dcfaa9168ee. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FROV62031301 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6081bddeee559f8cda639bfadab56d42bf40f3c094d83d02cdabc49b6cbaa1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEC991702801 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a73f115b01a5f3d16580da76739e44d9eef14cfe2f31654c5025b57f7fdf855. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEC991702804 — a six-check JSON result.
Benda: Sei Sonate per il Cembalo Solo, Sonata No. 4 in F Major: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea1421dba0afe8d93b6e59117666e1ac1d83ef0b4ac8f23ea19b5933ffb744d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEY321809001 — a six-check JSON result.
Pigmalion, RCT 52: II. Fatal amour (Pigmalion)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c706fd05bc2ac589cf49462d1441e5960d61548966e7a13e6ac4c763a2fcaa1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEY321809002 — a six-check JSON result.
Pigmalion, RCT 52: XI. Règne, Amour (Pigmalion)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f28b142f3541ba3acbee87549fe6805a0bf3cabe02776a1001c1bc5c075177. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEY321809011 — a six-check JSON result.
L’enlevement de Proserpine: Recitatif: Les Titans enchaisnez
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3ac93cdf6009b1e44544d7d6320b0cc03a1be4305ef7a99bfe3cc95c0b76ee. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ661757610 — a six-check JSON result.
Weckbacher: Quartetti per il cembalo principale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c406bf023d21fd38a9a033e34d40581b58cc16244e80a416814f3f27cc4c71. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLP711300022 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f704ccf34c9634144c527ba372f4104db573db63a28c1515c49581c8c8d5ed. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLP711300023 — a six-check JSON result.
Serenissima: A Musical Portrait of Venice Around 1726