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 0x670e302beb0782f0afaf6a3141c8eca6b6d1bfb3cc9b4afa9b89888d50772ac9. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55dfa474-af14-4efa-bade-64c8fb99b9bb.json and https://artists.proofprofile.net/proofs/artist/55dfa474-af14-4efa-bade-64c8fb99b9bb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonata in A-Moll, BuxWV 272: Sonata in A-Moll, BuxWV 272: I. [Allegro]
Dietrich Buxtehude: Sonates en trio – Manuscrits d’Uppsala
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 0xd66f8e4264de33d70d24b5a81a564324927fa2d6c91f0927f8cf1cbce983ece3. 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/FRU621530301.
Sonata in A-Moll, BuxWV 272: Sonata in A-Moll, BuxWV 272: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3bac8c0e270cad494bc8726d6378010f89856f44c79bd3691f9035c312ec54. 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/FRU621530302.
Sonata in A-Moll, BuxWV 272: Sonata in A-Moll, BuxWV 272: III. [Passacaglia]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd303dbe5ca47214932176e1cd0ff0aa6fa35fc83a9162cfb8982d065e79dbefa. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRU621530303.
Sonata & Suite in D-Dur: Sonata & Suite in D-Dur: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9bcc7825c95d050dc2aecb6572b411a04d315cca9a5ee8e330ea078be50b08. 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/FRU621530304.
Sonata & Suite in D-Dur: Sonata & Suite in D-Dur: II. Lento [Ciacona]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db9d11b3665e7a695e7d3a3385c49883e7cda3209589d4784f036efa86ef9ea. 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/FRU621530305.
Sonata & Suite in D-Dur: Sonata & Suite in D-Dur: III. Adagio piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24ea49f413b39b39f030937cd022f36db6e8b49708b4f33bd672037ab43b4ea. 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/FRU621530306.
Sonata & Suite in D-Dur: Sonata & Suite in D-Dur: IX. Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0d61cb72e3fe852c59731ac5381d86f08cc3bf2ce829d5e094d62a9a0ab090. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-07T08:27:05Z), 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/FRU621530312.
Sonata III in G-Moll, Op. 2, BuxWV 261: Sonata III in G-Moll, Op. 2, BuxWV 261: I. Vivace. Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45dcc0525b07ab014ecbb35e4ceda2098297bc2ce62848cefc008d5a9be343c. 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/FRU621530315.
Sonata & Suite in B-Dur, BuxWV 273: Sonata & Suite in B-Dur, BuxWV 273: I. [Allegro]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb93a99ad47da7d1d31c43f179d6484be1050d3549b00025abfb980db7a2249. 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/FRU621530325.
Sonata & Suite in B-Dur, BuxWV 273: Sonata & Suite in B-Dur, BuxWV 273: II. Adagio-Allegro-Poco adagio-Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842c4b9e6dfe5f45dbfe618cbe334b8b7106175f21054da835a86b2c354df918. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/FRU621530326.
Sonata & Suite in D-Dur: Sonata & Suite in D-Dur: IV. [Solo-Andante]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d164bb233ea9c3ca2a893904e5ae737f07c5e0e9b066c4ee1d46de3ea105cc. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FRU621530307.
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 & Suite in D-Dur: Sonata & Suite in D-Dur: V. [Allegro]-Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4a99908c1659b66f0274eea51a6ff8a8726b0a8414e457ef543ca7261e0ca1. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:36:53Z), 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/FRU621530308.
Sonata & Suite in D-Dur: Sonata & Suite in D-Dur: VI. Allmandt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32b673f1b569d12b59f3158fa6a470cabdc4a4f8d7ded31a014c0d0cc1e4b6d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/FRU621530309.
Sonata & Suite in D-Dur: Sonata & Suite in D-Dur: VIII. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79003af6c64238bc2ef62cce5edb094f33ba1a3d1a47d6abfe04908e40c842f. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/FRU621530311.
Sonata III in G-Moll, Op. 2, BuxWV 261: Sonata III in G-Moll, Op. 2, BuxWV 261: III. Andante [Passacaglia]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4795a0ab9f3104a16bc459f91688976e8f7f77e1417a4c911164ad684f6d069e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:19:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU621530317.
Sonata & Suite in D-Dur: Sonata & Suite in D-Dur: VII. Courant
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65d40e67f34efc8f47c5e51f7f9e83cc07ff633240c6f50314a9738124b82ea. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU621530310.
Sonata III in G-Moll, Op. 2, BuxWV 261: Sonata III in G-Moll, Op. 2, BuxWV 261: II. Allegro. Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e3fdecb0b128171e57e0b5f386c297884056002530e7dc33ae10b2e3be53ca. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU621530316.
Sonata III in G-Moll, Op. 2, BuxWV 261: Sonata III in G-Moll, Op. 2, BuxWV 261: IV. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedae535c108c7368b38cd8899b85a425ea650b0edb3290cbb5c0e4e0b61515f2. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/FRU621530318.
Sonata III in G-Moll, Op. 2, BuxWV 261: Sonata III in G-Moll, Op. 2, BuxWV 261: V. Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc0e47c8522628583287e186364f22cd4bd46bcfc403e5fdc085ef92963dcb0. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU621530319.
Sonata & Suite in B-Dur, BuxWV 273: Sonata & Suite in B-Dur, BuxWV 273: III. Allemand
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324aa9aa9be21f2a347a1638651d7530011b7a7f74fc31e831c3186c92e62a31. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU621530327.