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 0x70737ffb61bc7dfc787eda76ce9a04401dda68a68e5accaf172d9319ec975c12. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8a0ce1bd-a230-44d4-b757-2804b19a95e7.json and https://artists.proofprofile.net/proofs/artist/8a0ce1bd-a230-44d4-b757-2804b19a95e7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonata a otto Viole con una Tromba: 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 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 0x1a17b3d734ab85f49fcedf01e846fbc733a0b113a1a01e68780f2c53456e615a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBAJY8725501.
Sonata a otto Viole con una Tromba: II. Aria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd046b1b9f8b604eaea11252e879b23cba19172a621642d0a5e729517ed0756. 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/GBAJY8725502.
Sonata a otto Viole con una Tromba: III. Canzona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f892008fc1d43e42cb5e0cea72088cfcb3d9b1da974f2e877532c019b79258. 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/GBAJY8725503.
Sonata a otto Viole con una Tromba: IV. Aria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c78a62d4b8f3e822619166595ca6253741dffadec1bb3ed87ab50d736811d2. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBAJY8725504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6734bf8184450b4ffe0f7451caeb906e2a9cce87f285811869b5a0e08cc2c78. 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/GBAJY8725505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc536702176b209c3725c391fedf73a04b868c04efda4c3bad6e9ce091328759c. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBAJY8725506.
Sonata a due Trombe detta del Gucciardini
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04560ab4889621700cb9fe6100d443b508df6eb3a352f9bbd602a931a40ee629. 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/GBAJY8725507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ea56ecb493399753efe0060991b46e23ca88d4af0094b8110a6e2e8aba07d0. 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/GBAJY8725509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb709217a8c8149d63db64ec73815c8109c0c44a94047fb4e9672e4360dc0089. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBAJY8725510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810ffa700f4e79c7fcb74873be2b02162a063f32a3a99fb71a053b47b8f70911. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBAJY8725511.
Concerto di Trombe a tre Trombette: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f911bc0f5b2b3ad4b31254a401d6bfcdbde78bb38da11c908f0ced38e4557d. 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/GBAJY8725512.
Gli amanti generosi: Sinfonia: a. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2511868293900c3752d9549a4680dffedb034e1203c092f75abbc78e7b67e4cf. 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/GBAJY8725515.
Gli amanti generosi: Sinfonia: b. Largo e staccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5becd8454eed4c1913ffd56dfefd8a320ef31e0ff377d30f3fc52e42bd33b387. 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/GBAJY8725516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd720c8da236ef0d4087d0a47a833f90f203067a62358682df4b899d68a206296. 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/GBAJY8725518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a60dd488d2ef1e3cfe52a6b1c01410c230f4dce39a1d995e9f3264bdb00296. 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/GBAJY8725520.
Sonata Prima per Trombetta sola: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfa5dde62498550553a17046475df99a8623c38f31d7e43831e6d41ff6253c2. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBAJY8725529.