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 0x7ba7b7491be1c22cee5d9399093022dd8a879dbe7c74b451f1342f3af4ab57a0. Chain 2 (Bitcoin): anchored in block 954028 (2026-06-17T01:08:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39d704f7-f586-40e7-ab6c-42a14873763e.json and https://artists.proofprofile.net/proofs/artist/39d704f7-f586-40e7-ab6c-42a14873763e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Brahms & Myaskovsky: Cello Sonatas / Schumann: Fantasiestücke / Chopin: Polonaise Brillante
Sonata for Cello and Piano No. 1 in D Major, Op. 12: II. Allegro passionato - Adagio
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 0x4da42159333ce5a4da7a158bc369c27e1eea7d136a34f36b63e73be48129c1c8. 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/NLQK91600006.
Introduction & Polonaise Brillante, Op. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb803e0b2f8ccedd28fc3b5f289eb09773c8f027d3dbbe5f2f88785fcaa22da3e. 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/NLQK91600010.
Sonata for Piano and Cello No. 2 in F Major, Op. 99: I. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b454fa5236d4e4ef99a66bee299d21fb8043f909960411c0d26aeb962be4fcd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQK91600001.
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
Sonata for Piano and Cello No. 2 in F Major, Op. 99: II. Adagio affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbceda1a58999e2cb435ade7b2f500d1e606acc28068e84e2677124e2ba401af. 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/NLQK91600002.
Sonata for Piano and Cello No. 2 in F Major, Op. 99: III. Allegro passionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8649c3e2b46b55f9073bee905ae21c170936b22d2d45935caac58b7e6fb72466. 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/NLQK91600003.
Sonata for Piano and Cello No. 2 in F Major, Op. 99: IV. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1155bdb228859a0f05c5bfda4c949bd291d69e4ff66cfe8d91444703c197b486. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NLQK91600004.
Sonata for Cello and Piano No. 1 in D Major, Op. 12: I. Adagio - Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae628921d6cdf5568ec124abbf9b86cc9408c1c5fb7b4e3be761c630a7a56332. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQK91600005.
Fantasiestücke, Op. 73: I. Zart und mit Ausdruck
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b8322ca31cea0e9c3c7cdf9e4a981b5a85371d498e79f7547f20f9910aac9e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQK91600007.
Fantasiestücke, Op. 73: II. Lebhaft, leicht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607e1cc6f7600203ad93512ec91f24a095381cc96eac5f2294bca4f19cbeb504. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQK91600008.
Strauss & Mendelssohn: Cello Sonatas / Fauré: Romance & Papillon
Sonata for Cello and Piano in F, Op. 6: I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe853d2a69f9ae30fedfa78f9a103eae67c17c4f758eeaeff680e14285e0b4995. 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/NLQK91700001.
Sonata for Cello and Piano in F, Op. 6: II. Andante ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f14a227e8aac52d0118ba6c3f70c5c4a2f2d3095d280561259424eeb843abd6. 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/NLQK91700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a2378edf56b915d7f3ab044eac6b550a1f6e5fa000310dda8efe02ee3238aee. 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/NLQK91700005.
Sonata for Cello and Piano in F, Op. 6: III. Finale: Allegro vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56eefcf7286eed8b28172a8b518fc3f15205842b51ee813dc8e926ee8f3ef7fa. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/NLQK91700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da06d91a751a15ccd666ab4ebc7a60d7f274edcc8a4953615584874a3beb703. 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/NLQK91700004.
Sonata for Piano and Cello No. 2 in D, Op. 58: I. Allegro assai vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94a661c366be6a2e8f736b64af142af07b8c4d7072b9db1043e372c3d738274. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NLQK91700006.
Sonata for Piano and Cello No. 2 in D, Op. 58: II. Allegretto scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd224e2d77bd9a8915e3c4866852bc2807edcbfd8c1b8c1758e8a408c71f4389. 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/NLQK91700007.
Sonata for Piano and Cello No. 2 in D, Op. 58: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc0ee1c53e8c4e3d72838306b0963394f4b2cc075ee6a7267028da9823a72c1. 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/NLQK91700008.
Sonata for Piano and Cello No. 2 in D, Op. 58: IV. Molto Allegro e vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4b3ff92124d92f041d7bd350f34d6fa791e5d3fc1bab619a0377bfa73c84cf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQK91700009.
Gnossienne No.1 - Version for Cello & Bandoneón
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc7a8ef659e7e409ce9707f1ad7f6d9af225707eee6906ded2d9d8cb1a1ad2e. 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/NLQK91800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb089068aca0b2ac7f2969fb79f485ff58944633300b070dfbb59656b5cd1a98d. 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/NLQK91800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6fefc5f276485294c46e31b909f2b855a959f08ad1509ca6ab9eec02f03f63. 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/NLQK91800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527b8ece207a9b79bf7c51fa654312a6ae636e7046493bd5ac62e5ddd22abac1. 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/NLQK91800012.
Quartet for the End of Time, No.5: Louange à l’Éternité de Jesus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0364b19dab1b80ecbc5a77100127e4c0409fdb3191676951c5ff5c770bc333. 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/NLQK91800013.
12 Romances, Op. 21 No. 7: Zdes Khorosho (How Fair is this Spot)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593170456ce52f587ed32c2710f364a8dbe38e28f8c8031529e54947161bf7e9. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NLQK91800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab25c7ed2dc84b8b4b57988cc91c343bf2b93c23f94a1a57febab68d343c1b6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQK91800004.
The Carnival of the Animals, R. 125: The Swan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2daac736f4076d58ab40f43c8d98956d50e182f1d80c7a3ff3e9b9abdb3f0a7. 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/NLQK91800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd26a209bef1850b50a90b4810bdd60c29db70107ab65cafb002ac26d2d0e073. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQK91800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bbadffbc8696960c35f94ff41d145ce988afe8181efc47ba197164795f16ff. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQK91800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63abc63fcf2773eae16a5296373be0823c7428d70b65e61871d82b33128458c8. 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/NLQK91800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36614960fb08665aa26ce66b6d1f7ad7b289b09ba7982c7291c8d916abbf39b. 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/NLQK91800010.
6 Romances, Op.4, No.4: Ne poy, krasavitsa, pri mne (Do Not Sing to Me, My Beauty)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b5331b1ac539dc98c8546d8b87bec824a6a416585a1e848f93890011c4aaee. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NLQK91800011.
Myrthen, Op.25, No.24: Du bist wie eine Blume
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cffc02c94291da561be5fdb19d895640d5f131d1ba65d1b05c7ecc2b19d2c5f. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/NLQK91800014.