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 0x786f254b8cf8c6c4c280d6dc255d5e33355a7e603c5d47d1b2cd3e2889730165. Chain 2 (Bitcoin): anchored in block 953600 (2026-06-14T06:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0dba9536-9994-4806-933f-82b544cbff6a.json and https://artists.proofprofile.net/proofs/artist/0dba9536-9994-4806-933f-82b544cbff6a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach, JS: Harpsichord Concerto No. 1 in D Minor, BWV 1052: I. 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47cbe174b4c2dd5cd917917fde2008941cd4be9aa11a9c0d8c4884fa7b60e6bf. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1602347.
Bach, JS: Harpsichord Concerto No. 1 in D Minor, BWV 1052: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0fecdf3e597ba762336a32c38bd862055f3fb97dda7e3b6fb2f345d9c924e1. 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/GBAYC1602349.
Bach, JC: Harpsichord Concerto No. 6 in F Minor, W. C73 (formerly attrib. W. F. Bach): I. Allegro di molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40df960dee26c032906458894f45186402035484d89853a947703edb1d3f031. 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/GBAYC1602350.
Bach, JS: Harpsichord Concerto No. 5 in F Minor, BWV 1056: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e3f9c6eb97acc19e3646f0a5463e75ec047d7d05673a767dca35604ba78bb2. 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/GBAYC1602354.
Bach, JS: Harpsichord Concerto No. 5 in F Minor, BWV 1056: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f8041207f3c74c8a9c64b3cabfe8cd20b4686d7ee77423e8bcd938e8aff660. 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/GBAYC1602355.
Bach, JS: Harpsichord Concerto No. 1 in D Minor, BWV 1052: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607f7a62d754ef4f9a4d0a903d5fc87c4827548f8e71b7c6ff3e82163f92bc2d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBAYC1602348.
Bach, JS: Harpsichord Concerto No. 5 in F Minor, BWV 1056: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2eee177510cc121b0a673b2f79f5859013215a39d4b5610588a0347faa5ae8f. 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/GBAYC1602356.
Bach, CPE: Harpsichord Concerto in D Minor, H. 427: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae2c2f33e68cdafc42efb27e9b7a4943b5f07517e47b640f5aaff497c61b622. 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/GBAYC1602357.
Bach, JC: Harpsichord Concerto No. 6 in F Minor, W. C73 (formerly attrib. W. F. Bach): II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3615ff3fc4292273eaaec7642a3993c8cf29ca6c8a43414687bd0468609bafa. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBAYC1602351.
Bach, JC: Harpsichord Concerto No. 6 in F Minor, W. C73 (formerly attrib. W. F. Bach): III. Prestissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5588590c095375299c9b42ec378922da1bb485b433bd41b0aef050a9cdb93b6e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBAYC1602352.
Bach, JS: Harpsichord Concerto No. 4 in A Major, BWV 1055: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e6eab7db20472c50db95423fe5b75353380c038d1c82f314619470058ee29a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBAYC1602360.
Harpsichord Concerto No. 1 in D Minor, BWV 1052: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47cbe174b4c2dd5cd917917fde2008941cd4be9aa11a9c0d8c4884fa7b60e6bf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1602347.
Bach, WF / Orch Rondeau: Keyboard Sonata in G Major, F. 7: II. Lamento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95653f322c63c5ee76bf208cacb8484014171b310c1ef010c9e37d01774c0f67. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:16:49Z), 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/GBAYC1602353.
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
Bach, CPE: Harpsichord Concerto in D Minor, H. 427: II. Poco andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d42a445ebb11c9427511dfa713f2f48aab3017a749abd454b16419ca9e50cdf. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1602358.
Bach, CPE: Harpsichord Concerto in D Minor, H. 427: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec6852de3c64f8ddfede2db5a63b3377ae48c870e0249948a305050025b6e29. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBAYC1602359.