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 0x959ed45e298f6e219da8ec5e2b6ac4e49d1de82c83c0d599bb240fbe6e3fa4ad. Chain 2 (Bitcoin): anchored in block 954131 (2026-06-17T19:19:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cb76558-9006-4025-bfa7-274109a35324.json and https://artists.proofprofile.net/proofs/artist/7cb76558-9006-4025-bfa7-274109a35324.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Franchino Gaffurio: Missa de Carnaval e Motetti Missales (La musica sacra ai tempi di Leonardo)
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 0x1d9f03c0b28aca854cba0d2b792a6e07552a9ca246e87798aa1cf0eccc856ba1. 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/ITJ091300681 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc67e8f265d7b7d5db91f4001b6288534d560f57235969b94f62255da4c7762e6. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/ITJ091300687 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65911199fe7b9cb5b8ad17afbb395919a894292c7dbdf0df2f55e4e6c024acfa. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ITJ091300689 — a six-check JSON result.
Instrumental Music Around Christmas: Christmas Across the Centuries
Georg Philipp Telemann: Concertos and Triosonatas for Two, Three and Four Recorders
Il terzo libro delle pavane, gagliarde, brand: Brandi à 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e55909482139265f814c64666d9acf1ee0b8ca97ec127dcf749021d83d0f8e7. 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/DEB200603401 — a six-check JSON result.
Il terzo libro delle pavane, gagliarde, brand: Aria franzesa seconda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8346b5e17e002f84b147da44ab8e78d731da40d602449a3a8ab4363734672cb. 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/DEB200603406 — a six-check JSON result.
Widmann: Musicalischer Tugendtspiegel - Praetorius: Terpsichore
Chenonceau: Musica alla corte di Caterina De Medici
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc10f7e429ff7573e6bccaf7523def38a6572abfddd754646d63d31d30f717f8. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FR6V81567476 — a six-check JSON result.
La Rovattina: Canzonas and Dances from Renaissance and Early Baroque European Courtes
Mascharada: Two Centuries of Dance & Instrumental Music in Europe
Stabat mater dolorosa: Stabat mater dolorosa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ad50cb0b1d3a0696c2ae339cb21ad6a48a588b7bba3950fae505455691110a. 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/FR6V81226320 — a six-check JSON result.
Stabat mater dolorosa: O quam tristis et afflicta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f00c8e8ec03a85432e8f8c3158edf3e1607a435e4fdc855a55cdd663ad62e29. 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/FR6V81226321 — a six-check JSON result.
Stabat mater dolorosa: Sancta Mater, istud agas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f5a81b90eb1f071afd5d35cd11e9f8fe31bc6c150e19f608595b5d629f461d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FR6V81226325 — a six-check JSON result.
Stabat mater dolorosa: Fac me vere tecum flere
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbee78e0569aae61378257586908b7d593d8ddf34b9b8c1836025a8a8abc050a. 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/FR6V81226326 — a six-check JSON result.
Stabat mater dolorosa: Fac me plagis vulnerari
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7643dfb0fc51e64b753f699f564bddc7a1c068a616e11e2dfd95b91a19d1fb5f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81226328 — a six-check JSON result.
Stabat mater dolorosa: Fac me cruce custodiri
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf40e2057ce1cd298e4772733010c389163f58bd55ca4e83901443c301fc5cb. 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/FR6V81226329 — a six-check JSON result.
Singing Christmas: Vocal Music for Christmas
Alessandro Stradella: Esule dalle sfere - Chi resiste al Dio bendato