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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784f700f18f84f88c63441f5a2561eb0fdd2324773784db915fa277f4d63605b. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2f711c3d-f0c9-4b57-8a5c-e0985c8c390c.json and https://artists.proofprofile.net/proofs/artist/2f711c3d-f0c9-4b57-8a5c-e0985c8c390c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285192fed3ed708348dc4283ba1fa3a4e6d96bb54f4a50888f8c2f6e6fcd450e. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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/SEAEB2022010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f9e6ee3378304414f0cc8542d02ba4096260d3825d59a0d812305888f7b51f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022020.
Élégie in C Minor, Op. 24 (Version for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe584d13d26ecf6f94db1ddf457abf74b7d69d7635a4b9dd16e53020315c7d168. 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/SEAEB2022030.
Cello Sonata No. 1 in C Minor, Op. 32: III. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7edf00a679fad181d07c710f4f074109485598475fe9f70fd9a6d38ee31559. 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/SEAEB2022060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675ef3026a5b0cc848322a6cf432ab7d339d5ea0a08f33e8c86637af7af80536. 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/SEAEB2022080.
Violin Sonata in A Major, FWV 8 (Arr. J. Delsart for Cello & Piano): II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba874a253b2444482dd94bbc56b20990c13ab501a53f7187ca77f338837febac. 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/SEAEB2022110.
Violin Sonata in A Major, FWV 8 (Arr. J. Delsart for Cello & Piano): III. Recitativo-Fantasia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aaa08e663d30fc017dd113f2335a3e672dae70ffbbd0741daf7623632ab7ce5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022120.
Violin Sonata in A Major, FWV 8 (Arr. J. Delsart for Cello & Piano): IV. Allegretto poco mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9de3cbd7f667770a58a7dd2d783cf4fc8e2928813758f1c1a5178def3f369ad. 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/SEAEB2022130.
Cello Sonata No. 1 in C Minor, Op. 32: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f6e2130a15774bcaae3974b0768818f8a96f186976190189030de7397c6fdc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022040.
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
Cello Sonata No. 1 in C Minor, Op. 32: II. Andante tranquillo e sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f802d9965a6be0c13efbf59cacc9795595d5de86c6078430517cc11b87253cb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022050.
Cello Sonata No. 1 in C Minor, Op. 32: III. Allegro quasi presto (Original Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc59ca96c743345be4bd044b90ab83644d26e7dd926b55a4fe4d66eea6843f1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022070.
Récitatif et chant (After Holmès's "La vision de la reine")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7fa9fab4b15c10b3f1957607e1b05f147b8b286a3b9189db94b876e9d0990e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022090.
Violin Sonata in A Major, FWV 8 (Arr. J. Delsart for Cello & Piano): I. Allegretto ben moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d34e179de7331f2861639fca9e3e28d8219865f1af8a01c890ca7daf4bf7b77. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a6476563db2e7ce325b0d6e2bd3d37416712e47db01038ea1f90bc9f97dc22. 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/SEAEY1712040.
3 Kleine Stücke, Op. 11: No. 3, Äußerst ruhig
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624a179bcfea640d9649775f66ceb635531f4a1d3a1153c8b36cb0020ab4ecc3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1712110.
Carnival of the Animals, R. 125: XIII. Le cygne (Version for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe430e15edd1cbfe489013f4aa7cfc36311fd443a714da00f52c1c8d9042fa18a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1712120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a598894017716bbc69451b8f2fe9ae352908a99a832b3af07a1ed0e0f9d1e0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1712130.
God Save the King (Arr. for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eae1119e56c0fb8a88a1a64f6b445271ae663b0c6b80b35b9dcc4a884c9d326. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1712150.
Cello Sonata in D Minor, L. 135: I. Prologue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d32ceecc66b88dab20deab63983412f5ea98c09920a3df68b3daa71a5d48764. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/SEAEY1712010.
Cello Sonata in D Minor, L. 135: II. Serenade
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00201c2248d8733792695d6502ae4913efd7febebb90212eec48576b7f5f2a1f. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1712020.
Cello Sonata in D Minor, L. 135: III. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f567175086c371c18990e8d520fc5d9dfd05d0964d8b07590cb8d57293bdbca. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/SEAEY1712030.
Cello Sonata: II. Adagio ma non troppo - Molto allegro e agitato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa019726cbfc876b99734c194f1e1f96134cd91c75ab0b5449e14db912a8aa173. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1712050.
Cello Sonata No. 1 in D Minor, Op. 109: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14db79661d9c036e2d9a53edaddbca22ca70722b6a63c8991afaf1815d8196d5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1712060.
Cello Sonata No. 1 in D Minor, Op. 109: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5989df32fc8fa32dc8e42fe48c8d2d5caf8c1c808dcc2aa822a999adb0480f7f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1712070.
Cello Sonata No. 1 in D Minor, Op. 109: III. Finale. Allegro comodo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ad3b0052acdaccc6fd5c843747cb78991ba312323b17f6e6c9216b1ef96192. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1712080.
3 Kleine Stücke, Op. 11: No. 1, Mäßige Achtel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7fb083d5bd1c7d80aa241c73821bb19d1ff941b3e8b50ad9adf79033c48c515. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1712090.
Keep the Home Fires Burning (Arr. for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e2c83f28a59769b56b1d86933512eedbba9cd69e8a1f47c629a4cae60005df. 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/SEAEY1712140.