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 0x8cebc433afb3bd25424d26a0f6836ce42d2ca1c48bbf5493e6293d353c1cdf54. 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/3daa1dfa-3a92-4a5e-aaf0-4cd3adc670d9.json and https://artists.proofprofile.net/proofs/artist/3daa1dfa-3a92-4a5e-aaf0-4cd3adc670d9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Magnificat in D Major, BWV 243: II. Et exsultavit spiritus meus
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 0x022e2c442d63979bb073febd567ae7cdb3527a3a1a764e995239cb36b002ab7b. 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/DEE862002666.
Ich habe genug, Cantata BWV 82: 1. Aria: "Ich habe genug, ich habe den Heiland"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2237ce6bdd910988d5d0e75cb82940362b826c848ac606a3464c64c6571015. 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/GBBBA1100311.
Concerto Grosso in B-Flat Major, Op. 3, No. 2, HWV 313: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc904bc27fc015f57c1c66a5a7b0acfe70bc4491f7337ceb1ca06df82a7c1d931. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEE470901062.
Concerto Grosso in B-Flat Major, Op. 3, No. 2, HWV 313: V. Gavotte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752002554f5ac14b9f02b9b50cf9411ba11a4cccfc992a65cc9905c9dcc5e3a9. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DEE470901064.
Concerto grosso in B-Flat Major, Op. 3, No. 1, HWV 312: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c28e074b009998eb20d2382d7d06ec19ce2d89a03ffba27c5e25e855983be6d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEE470901066.
Ich habe genug, BWV 82a: I. Ich habe genug (Arr. for Soprano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa749f4983984fd0042038a48951798ec3f419dd5ed3909d523ab0d32896b20e9. 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/DEE862002655.