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 0xdcca3d9151123a08924aee1b1071b75e4c6950ed2851e6ee66e06af1866d8656. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7a5f776d-7b16-4fe5-a16c-20b50c621b79.json and https://artists.proofprofile.net/proofs/artist/7a5f776d-7b16-4fe5-a16c-20b50c621b79.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
First Steps in Classical Music: Keeping the Beat
Concerto Grosso in C Major, Op. 6, No. 10: II. Allemanda: Allegro
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 0xbf6a88cd3fe279c4ff96ec48752d3b75a257b9659c193d8df0a58b728a9f9a5b. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/US7851400140 — a six-check JSON result.
Concerto Grosso in B-Flat Major, Op. 6, No. 11: II. Allemanda: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd907438da13a46d36b56a0e653fd27889a5f253fad186cecbba5657255bbb71. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/US7851400141 — a six-check JSON result.
Concerto Grosso in F Major, Op. 6, No. 12: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7583103bfeee7d60b9826d695b3a86a8eb61fb3b4fa023490b722ee16524e12. 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/US7851400142 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15461b3503103a630981351a827d3edbc82956e3f16b63cc8656a116898a489d. 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/US7851400143 — a six-check JSON result.
Gloria in D Major, RV 589: Domine Fili unigenite
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f2a426a42ee8ea688bcc99392575aaf9ee8ca01abcb1696f8edb85ab6a0f76. 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/US7851400144 — a six-check JSON result.
Suite & Dances: Suite and Dances: Premiere et deuxieme contredanse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93527025f766b5447a62e5a46868bb8bdf41e89dd76e831de026f1bf10f5a1a6. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/US7851400145 — a six-check JSON result.
Orchestral Suite No. 3 in D Major, BWV 1068: Overture (Suite) No. 3 in D Major, BWV 1068: V. Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17905f30a18dedb86faf13a4c2c437b7b2b96def6bb35df6ee10adcdedc24374. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/US7851400146 — a six-check JSON result.
Orchestral Suite No. 4 in D Major, BWV 1069: III. Gavotte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd881455e8161588e6ff292a1349bd78edbe05a139aee12aad79e08110a7541e3. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/US7851400147 — a six-check JSON result.
Orchestral Suite No. 4 in D Major, BWV 1069: V. Rejouissance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9907ee0e6812e810cdf66e5f1ff45d73b9459767f8eb0fcdbd8a0f7588ceb8d4. 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/US7851400148 — a six-check JSON result.
Orchestral Suite No. 2 in B Minor, BWV 1067: IV. Bourree I-II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b66311b84e170bad36f166700f95fa30f0345e7c457a0a734b28fff05eb380. 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/US7851400149 — a six-check JSON result.
Orchestral Suite No. 2 in B Minor, BWV 1067: VI. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb322d59ab6cdb9a340fd17991b0b5ee1777d44ebbee42e232376428e467b6eb. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/US7851400150 — a six-check JSON result.
Orchestral Suite No. 2 in B Minor, BWV 1067: VII. Badinerie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195be6b9d87b8f49a2b305414a4c4fb6ed8288559c82708782f3946984f4da20. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/US7851400151 — a six-check JSON result.
Water Music: Suite No. 2 in D Major, HWV 349: Gigue (arr. A. Balsom and T. Pinnock)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7508b4fdbeeec13322a42c2d37775b30d98e60f45f6ac58d47ca8b3fecd7fdf. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US7851400153 — a six-check JSON result.
Music for the Royal Fireworks, HWV 351: VI. Menuet II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f70dc3e9e69eefd138579be69858332f1678ac5f37a7d5f62d0f14227eda348. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/US7851400154 — a six-check JSON result.
Water Music: Suite No. 3 in G Major, HWV 350: I. (Menuet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341eb315ce82d98fe1e84f3bb50a55ec1565da03884b9bf123d7f82b98acf20a. 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/US7851400155 — a six-check JSON result.
Concerto Grosso in D Major, Op. 1, No. 5: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131dadd24ebee44f9335e2cd24e81f01d11013f75b9a4d4d35a087d4b117f9ae. 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/US7851400156 — a six-check JSON result.
Concerto Grosso in D Major, Op. 1, No. 9: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed902ce87e2c1f43bae13b556767db77492c859c282a53f41a0b8f0f0d4ac21. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US7851400157 — a six-check JSON result.
Serenade No. 13 in G Major, K. 525 "Eine kleine Nachtmusik": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9edfdea3ddb61f53924e4890885814e89e4b2776869daccc3903ebcab921dba. 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/US7851400158 — a six-check JSON result.
Serenade No. 13 in G Major, K. 525 "Eine kleine Nachtmusik": IV. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bdb12066131ab4c639fb8ace09c5ebe4bc87d1b5459b9ab282e9d537c37609b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/US7851400159 — a six-check JSON result.
Symphony No. 40 in G Minor, K. 550: IV. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263f7807b2c7b456e699d585de41ca2cd1db6802933f535d9bb557ca843805a7. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/US7851400160 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f5614b36d9c63173e7c9fe0d8eb2fbd1bec61211834d177cf33afeac506cfc. 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/US7851400161 — a six-check JSON result.
Gaite Parisienne (After J. Offenbach): Overture (La vie parisienne)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91f1a853e8ab7a1fc2a65f2e0b1d6927df5bdba665e00b9171f8d17040e56bd. 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/US7851400162 — a six-check JSON result.
Gaite Parisienne (After J. Offenbach): Quadrille and Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce556bcb1b8ef47bc8b1d448c07617121fdf75a6611b508c43b60651763949b8. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/US7851400163 — a six-check JSON result.
Gaite Parisienne (After J. Offenbach): Allegro and Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7cc419d3a2f4662ee654eb88c6bc18b14ddd6a661cb01bb7bb4f6d8975e3fb. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/US7851400164 — a six-check JSON result.
21 Hungarian Dances, WoO 1: No. 18 in D Major (version for piano 4 hands)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69850d606241a68d228a25610d3a7a554be41952f8f8c46fd162f61ea8f66979. 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/US7851400165 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30296595b63bbf26c3841033b5de0c373875ec792671422166f683e0890b1853. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US7851400166 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bad4327cab38681ec2287f4a2ed90f78b14bf850d9f4a348e98edd43d17f1b. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/US7851400167 — a six-check JSON result.
Antiche danze ed arie per liuto (Ancient Airs and Dances), Suite No. 1, P. 109: I. Balletto detto Il Conte Orlando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaecec591e3278ed1317af02439bb08c6c626e8407b269749a5ea3c4b59bc883. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US7851400168 — a six-check JSON result.
Antiche danze ed arie per liuto (Ancient Airs and Dances), Suite No. 2, P. 138: I. Laura soave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39847e5c84429af0919fcf30fe028a777cfc8838b32af51559f1b130c6268c3e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US7851400169 — a six-check JSON result.
Háry János Suite: Hary Janos Suite: II. Becsi harangjatek (Viennese Musical Clock)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5ef92fc0f2fa4f23fc67fd49f2f8783f3e45ae9494d1d7b1913090ac774b75. 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/US7851400170 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2037326e1c8529bc72ffa324cd577292ae9b57c6f66b5d45011bd0ace11b92. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/US7851400171 — a six-check JSON result.
Symphony No. 1 in D Major, Op. 25, "Classical": III. Gavotte: Non troppo allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd809618abbf8b66093515ef2ff979ace844b88c893f1dfb52dfbc7944706c744. 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/US7851400172 — a six-check JSON result.
4 Dance Episodes from Rodeo: Rodeo - 4 Dance Episodes: IV. Hoe Down
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf87f2c112f06b10b4699105be61bcb05f4344a15c99b2b1bcb5987e35be99aa. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/US7851400173 — a six-check JSON result.
Romeo and Juliet, Op. 56, III. Preparation for the Ball
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf467ee9939860414689f48242809c52a101ff8a98e53d806e37bed8e36bf7f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/US7851400174 — a six-check JSON result.
Komedianti (The Comedians), Op. 26: X. Epilogue: Allegro molto e con brio - Senza ritardando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8e96a8f21375fb98b12370b43462ad9fd48d5e7c3d3a0ea7e4a3b6813a0e20. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/US7851400175 — a six-check JSON result.