thumb|Pierre Vallet, self portrait, 1608 Pierre Vallet (c. 1575, Orléans – 1657) was a French botanical artist, engraver and embroidery designer. He worked as a "Brodeur ordinaire du Roy" in the cour
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 0xa148f452da4b512d38270a59eebdb60487f2d98f220019dd33800dde9cb1c2fb. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d889e801-b156-4e79-a54a-a45dab64fb57.json and https://artists.proofprofile.net/proofs/artist/d889e801-b156-4e79-a54a-a45dab64fb57.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Concerto No. 20 in D Minor, K. 466: I. Allegro (Cadenzas by Luca Belloni)
Mozart: Piano Concertos Nos 20, 21, 23, 27
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 0x0d62bf6e84dc88187c4db4f6706795e8929c0358bff2d55d003fba15dbaa3c36. 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/UKGFN2200305.
Piano Concerto No. 9 in E-Flat Major, K. 271: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3aefdb7f0d52f8c00b2985818964039183201f7185ee1cd3f78b3978641793. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/UKGFN2400283.
Piano Concerto No. 9 in E-Flat Major, K. 271: II. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd90cc1369723a985f5faee0e009c949efb95a6d807de5f4485dbcdf55fd9f5b. 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/UKGFN2400284.
Piano Concerto No. 9 in E-Flat Major, K. 271: III. Rondeau. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc11e1d896b1fd1448c2f9f15c7c027f5e20ce685b4e7019ed4f59f1b556d01b. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/UKGFN2400285.
Piano Concerto No. 12 in A Major, K. 414: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618cbb0aff444ecb066ce5c9dcf7b6b91cdc7aa4c592f1c4f5d13afbfd3151a1. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/UKGFN2400286.
Piano Concerto No. 12 in A Major, K. 414: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5d1b5191a58a90a919855b02d29823aea0c596fb1a9a3eeac963163e0da785. 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/UKGFN2400287.
Piano Concerto No. 12 in A Major, K. 414: III. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1b404e236ca71066963e05d615ceb1ef0634028383076410697301ea95e9e9. 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/UKGFN2400288.
Piano Concerto No. 20 in D Minor, K. 466: II. Romance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f66f5a39645b8fcb9eb32c0332c34c4d10f387afc8acc1204c52f2f9ddc4f82. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/UKGFN2200306.
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
Piano Concerto No. 20 in D Minor, K. 466: III. Allegro assai (Cadenzas by Luca Belloni)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc396459c4d22e8c7b19420d8c2c8e51c1b45ed5c704d074c824826a3be13dc. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/UKGFN2200307.
Piano Concerto No. 21 in C Major, K. 467: I. Allegro maestoso (Cadenzas by Luca Belloni)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746b5340bbe3ef22cf0999a9cc5d2869d77893527dbe61c54155d441c47d0ba3. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/UKGFN2200308.
Piano Concerto No. 21 in C Major, K. 467: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2218b60b1bcea85ff59dc3206f4b114e7e91b751875f2f494362c8d14b06cb. 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/UKGFN2200309.
Piano Concerto No. 23 in A Major, K. 488: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8011d4afe062c655f3e96b0d57dea462237b48914a254c76ef6c5b8edbb94f95. 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/UKGFN2200312.
Piano Concerto No. 27 in B-Flat Major, K. 595: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440fcb508365ed638e23edd858ac462eb4096e231e471fe111edfbec7872693f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/UKGFN2200315.