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 0x9f13ba2ac2467ba752445effb168416eeb686e8506affff19b1f3e47c2032c71. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9283c56-cefd-481a-9237-e579fc88f51c.json and https://artists.proofprofile.net/proofs/artist/d9283c56-cefd-481a-9237-e579fc88f51c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto pour 2 violons et orchestre en la mineur Op. III n°8, I Allegro - A. Vivaldi
Vivaldi, Concertos pour violons, Violins, Bach Transposition pour orgue, organ
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 0xad4459fb01b29149a4b194fca2e4b9c10a0352debdba3d50d1316df970d3817f. 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/FR0O70505940.
Concerto pour 2 violons et orchestre en la mineur Op. III n°8, III Allegro - A. Vivaldi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c1d677ef7c4d8ee1787b17398778c201cb2b90494d2cdba6d4ffc15f2bd28c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR0O70505960.
Concerto pour 2 violons et orchestre en la mineur Op. III n°8, II Allegretto - A. Vivaldi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93bf492a09bcc92cebcdd875cb8800bc809188c76240b97f2781f4c5eee231e. 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/FR0O70505950.
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
Concerto pour violonscelle et orchestre en la mineur Op. III n°11, I Allegro - A. Vivaldi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f3433418f157b51d580109dcfe33be5d6019b65539f2102da381847ba7505d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FR0O70505970.
Concerto pour violonscelle et orchestre en la mineur Op. III n°11, II Largo - A. Vivaldi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02cd391e3822c67e940e6ca2a93632ff2e4d766971dfb68199d2c23bedca79bb. 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/FR0O70505980.
Concerto pour violonscelle et orchestre en la mineur Op. III n°11, III Allegro - A. Vivaldi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f2f36652d6efb1d88b4da99041000a082d205e4541466c6ced870b373cd776e. 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/FR0O70505990.