thumb|Jonathan Dunford in 2015 Jonathan Dunford (born 30 October 1959 in Trenton, New Jersey) is an American violist specialising in the baroque repertoire. Biography After studying the viol at th
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 0x8f7093dcb54e1f81a6ba0e4adda0dcf0bead9c22ec67d3b6f1db744870b8051c. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2718eafe-00f5-4a50-a466-c44041ca6e3f.json and https://artists.proofprofile.net/proofs/artist/2718eafe-00f5-4a50-a466-c44041ca6e3f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sainte-Colombe le fils: Tombeau pour Monsieur de Sainte-Colombe le père - 5 suites pour viole seule
Marais: Folies d'Espagne - pièces inédites
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 0xc5817c3757bde3c86791d8ce524ee316e811d760bb53afa0dd1dd09d6d14119b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ070001340 — a six-check JSON result.
Prélude pour le Théorbe - Théorbe Seul Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb319843b510946e7244b3bbe98f6d1bd35629c842f2c8e0d0b2bf483c4e4d0c7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ070001390 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb983879406e9a5a44daf913f9d3a7e8880a84a921fe4f59f83505bebde348a. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/FRZ070001410 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b643eb38414294717b1fcf057e1760893216e03c14692111772ed2c5ec64d5. 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/FRZ070001420 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a168bacc36aaea5c750d9d4fbf1dacc1a1e9f68f07e471c902401dd1fb842d. 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/FRZ070001430 — a six-check JSON result.
Sainte Colombe: Suites pour viole seule, concerts à deux violes esgales
Doctor Coleman: Music for Solo Lyra Viol
John Merro's Book: Music for Lyra Viol from 17th Century England
John Merro's Book: Suite for Two Lyra-Viols
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0203d54c03ede0e441a7034fea78353a4e750c3c392b91cd2cc82a7ddfe734. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM92009826 — a six-check JSON result.
John Merro's Book: Lachrimae for Solo Lyra-Viol
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa45c3eeae8f92f587a2406954b4a2e359ce311dc5e254e8854d4f69bb1d3c3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM92009827 — a six-check JSON result.
Louis de Caix d'Hervelois: Sonata No. 3 in B Minor
Suite in C Minor: VI. La Savigny - Allemande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720a9c63b35a6f17afc8e78849522d3c6e7bdd6523a7cdd485ecddf427424684. 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/USHM92124109 — a six-check JSON result.
Ténèbres : A Representation of the Tenebrae Service
Bach - 3 Sonatas for Viola da Gamba & Harpsichord
Jean-Baptiste Cappus: Pièces De Viole - 1730, Vol. 3
La Princesse Palatine: Portrait d'encre et de notes
Jean-Baptiste Cappus: Pièces de Viole - 1730, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0f0a43d0dbca1d71093ec31b787a71187bf1eaf4bbb6310db91280cbe85b91. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM91647998 — a six-check JSON result.
Jean-Baptiste Cappus: Pièces de Viole - 1730, Vol. 1
Telemann - Fantasies for Solo Viola da Gamba, Vol. 2
Solo Viola da Gamba Fantasie No. 7 in G Minor, TWV 40:32: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90a2285991adca7c79b61a6840d49eeee6231961aaefd45aaf17515b0b11912. 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/USDY41628054 — a six-check JSON result.
Telemann: Fantasies for Solo Viola da Gamba, Vol. 1
Le Sieur de Sainte-Colombe: Suites for Solo Viola da Gamba
Ferrabosco II: Ayres & Lessons for the Lyra Viol
Love Is the Cause: Scottish Tunes for Viola da gamba & baroque Guitar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22f7b536ba1da269570cf5265ca650f58e545dab4bec12ec828f583af597854. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0953004 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2773cdd1dcbc4553941813ac11d6715950f6c9e28608cce27ac131f7013cc25c. 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/FR50X0953010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f745d434f58743c20bcb348482c0d829a73b9fe88115bf9be5680d201ecee7. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FR50X0953013 — a six-check JSON result.
Hume-Ford-Hotman-Dubuisson-Verdufen - Pièces de viole en manuscrit
Dubuisson - Suites pour viole seule en gammes montantes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a26ea10f9671a9a39a92c28995108d6fc9dd0516753f8a1082851ff15ab37e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRZ129601030 — a six-check JSON result.
Ms Drexel 5871 for Viola Di Gamba, D-Moll: V. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32536151ca4f61a7bed68885a27fe74a66b3922b771d912933cdb9ea6f6581e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USHM82127511 — a six-check JSON result.