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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa1909f0a00f62f670e3d640cf1c5a1b0aeccbc6b972f754f7e823dd01e5215. 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/7ad36a47-6e3b-4dc0-a2bb-6f1749dabb91.json and https://artists.proofprofile.net/proofs/artist/7ad36a47-6e3b-4dc0-a2bb-6f1749dabb91.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Obras-primas da música clássica brasileira
The Essentials: Classical Guitar, Vol. 1
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28251be476c9893ad2846019fadf393a18f234e1ff5694d01ec878c72566ca97. 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/USB8U1601608.
Sonatina canonica, Op. 196: II. Tempo di Siciliane
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476fe41ea85e258e70a7c3fcff3acf75753b584887a279bde44f649c5195053d. 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/USB8U1601616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d192dba4ceacd323b8b8a07019164ec490546231424fb1a9c202eaa03f63e7. 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/USB8U1601645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f65c617f0d2422eed5ffd0676c71ffa1edc2c1626a876da0a9e01dd750b9d55. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USHM21712341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78eecfabf260202d8ca511cbc20058651c1f89c08cd8817d456fb515b32568f. 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/USHM21712343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54d972f5084d6287e571973a4165ba8ea8818b9f5b8dae20b386b28f944b9b2. 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/BXRHI2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89541162a0d3050450532865a7da850095d918402eb010eb433baa2539976fc7. 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/BXRHI2200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c25538f25d6c347e993a6b5e920a130963f4c04c90fd349aeb836df33ccc44. 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/BXRHI2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a95a79d7b3fbd15673b3716fc9e1cef30a14f836500cd0b862c9e54920abef. 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/BXRHI2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1168b508fc7b39393aab158c8bad5ba2d0ac30d20a290f3419b959a70cf7c0. 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/BXRHI2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7042b6393ae362783ba3dbf636a9d6f1bba8f18964db1c853d817e18212e7624. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/BXRHI2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fef5365262bbfc02c9f809ad021cd94bc40427d3c590d1e46af66e2fb7145c. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/BXRHI2200023.
Brouwer: The Book of Signs - Bellinati: Concerto Caboclo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfdf8d6ea710bd3a25b972867b31b4f8d3b523402d077ec24c420c3683e1dcda. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/HKI191508201.
Castelnuovo-Tedesco, M.: Music for Two Guitars, Vol. 2 - Fuga Elegiaca / Les Guitares Bien Temperees: Nos. 13-24
Les guitares bien temperees (The Well-Tempered Guitars): Preludes and Fugues, Op. 199: Prelude No. 14 in D Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807d5e49638c66f9096dd96be24a7bcb3501912ffe7e8539452ebc02ba6431fd. 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/HKI190917403.
Les guitares bien temperees (The Well-Tempered Guitars): Preludes and Fugues, Op. 199: Fugue No. 14 in D Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328ec0aa6934dbe11759ae227798b7d6be2011aa5359b6c22738ff9af933d7ac. 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/HKI190917404.
Les guitares bien temperees (The Well-Tempered Guitars): Preludes and Fugues, Op. 199: Prelude No. 17 in B Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de6bad2218182b1b6171b9f8464be17b8f9e01bfd6e79c07757ab931326b057. 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/HKI190917409.
Les guitares bien temperees (The Well-Tempered Guitars): Preludes and Fugues, Op. 199: Prelude No. 20 in G-Sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b772eeb839bf4644e92ab007a4452daa61d42da9f62521ed1cc5a2ef13daf09. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/HKI190917415.
Les guitares bien temperees (The Well-Tempered Guitars): Preludes and Fugues, Op. 199: Fugue No. 20 in G-Sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b20e03da7c7b80bb49d52b4bd559bd1486ac343d497c2f4d352786f943ecfc9. 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/HKI190917416.
Castelnuovo-Tedesco, M.: Music for Two Guitars, Vol. 1 - Sonatina Canonica / Les Guitares Bien Temperees: Nos. 1-12
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522a141e006a1697a1b8d47da002b67bb28eefb45b292ecb7dec74bcf4b5aadb. 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/USL4R0787132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67af3d139c2fe1a4be672e1f82814252eb018be90b8b6e0eb096782c3609770a. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/USL4R0787133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab3fce133cdee858e3c55da3f4544d1fb5af7f28677b809d9a6ec71cc9ad883. 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/USL4R0787134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaacdab7f8943d8bb1cd98cf5dc1f141dd943ada06d3f2ec071c74021666fa43. 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/USL4R0787135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d2a7d6bf55beb903c716f1781b865dbefdb2fd1d0f254716a41c5080e487e5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USL4R0787142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3e485b8e0dfc80dbe86ab10e061c7badc72c21c98978c32921e6984009e30b. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USL4R0787145.