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 0x95379e838d3ed9b421f6d8c643c4be64974458450dd476edffb8430f38d67864. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e059c471-a645-402b-a819-3f5faee2a945.json and https://artists.proofprofile.net/proofs/artist/e059c471-a645-402b-a819-3f5faee2a945.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Famous Gambists of the Past (Abel, Marais, de Caix d´Hervelois)
Recorder Sonata in G Minor, Op. 1 No. 2, HWV 360: I. Larghetto
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 0x4b3bc1e60c18de6e69c869607ce8d30f172ea629a781f9f48c2a23690c16bd86. 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/CZA160506509.
Recorder Sonata in G Minor, Op. 1 No. 2, HWV 360: IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b17911fbaf2b03b47a8f27a66603935e1142b63f15856a6187447091fb255c. 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/CZA160506512.
Recorder Sonata in A Minor, Op. 1 No. 4, HWV 362: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d68ce6612d898b775435964ac6a6a48b468f0842c9010cddae4132a38a2347c. 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/CZA160506517.
Flute Sonata in G Major, Op. 1 No. 5, HWV 363b: V. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4873194405dd3b4e6ff1f85bf1dabe3888f22f211573d4fd5758819e64ca348a. 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/CZA160506523.
Recorder Sonata in C Major, Op. 1 No. 7, HWV 365: I. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208c90d15f4ffd22e103400c274efc69fef1a9db7f1b78c8e8b541befc09652e. 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/CZA160506525.
Flute Sonata in E Minor, Op. 1 No. 1b, HWV 359b: I. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc1f5d9c46eb455d90ecd1b637447ed04fa9d22bfd728dad456263638b11977. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160506504.
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
Flute Sonata in E Minor, Op. 1 No. 1b, HWV 359b: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fe022c8a86879327bfacdde40ea25f869731d0082fdfc2d12bf7c43176f381. 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/CZA160506505.
Flute Sonata in E Minor, Op. 1 No. 1b, HWV 359b: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc1911facd4e49e8c4c4ced7d508892c84cadeb74ab48203594b74d9ff2f00a. 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/CZA160506506.
Flute Sonata in E Minor, Op. 1 No. 1b, HWV 359b: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf2054ed1454ccff3e3cafef801e38f16cc17ea82feb3bcc5ef2a475b423231. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160506507.
Recorder Sonata in G Minor, Op. 1 No. 2, HWV 360: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1ea22efb98a4603b1328a160a1896f8010e595939d1622967a4892675cba1a. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/CZA160506510.
Recorder Sonata in G Minor, Op. 1 No. 2, HWV 360: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bda76c57798aa52ecc84fc881d02dc468e4d08377fa9a97e1a18fcde1c251aa. 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/CZA160506511.
Recorder Sonata in A Minor, Op. 1 No. 4, HWV 362: I. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00702ab956bf941c8caaabf87283f8b1702f76a3e533ac2d4db3aa5ed5758d6b. 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/CZA160506514.
Recorder Sonata in A Minor, Op. 1 No. 4, HWV 362: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1530cce024c809058e80cc70f241727c10d0d48f7d826b2005c5958dce25fcc8. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CZA160506515.
Recorder Sonata in A Minor, Op. 1 No. 4, HWV 362: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bf746727c81603a8a407972dc4da2f9d45a5758b069d8d4212c1acb7549cd7. 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/CZA160506516.
Flute Sonata in G Major, Op. 1 No. 5, HWV 363b: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84627bf73ce3f24ed535214fc1db60ba301a96eeaf487ace717c3457eb7acc0a. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/CZA160506519.
Flute Sonata in G Major, Op. 1 No. 5, HWV 363b: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dccd7df75ad29dc5e0360947b617ad375fc7c54e95b00d7bb6f90573f25000d. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CZA160506521.
Recorder Sonata in C Major, Op. 1 No. 7, HWV 365: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd783a4152b7e6154c2747c4cfd9e181762306a132047b9c4375eb9c88637475d. 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/CZA160506526.
Recorder Sonata in C Major, Op. 1 No. 7, HWV 365: III. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x462c22f0a1f0bc43f4c79516a25c492d72ea5ddca82049cee37ac25e4f0a31c5. 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/CZA160506527.