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 0x0dd738f7b7db9c99bdbe10f0313c53b1e691773e4f9ca8ded394486e005bd961. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ee46845-d852-4131-b4f9-4ebd40547c97.json and https://artists.proofprofile.net/proofs/artist/3ee46845-d852-4131-b4f9-4ebd40547c97.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Vivaldi: Concerto for Two Mandolins in G Major, RV 532: 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 0x9b8c7aa01d6e346d0c85c8c6af1050eb66b73f05f0b8341a35bdfe974e3570bc. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306001 — a six-check JSON result.
Vivaldi: Concerto for Two Mandolins in G Major, RV 532: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa302232eb4967d74b8b53c78061ac7705ff0da870c0017753e1c97430c71839c. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306002 — a six-check JSON result.
Vivaldi: Concerto for Two Mandolins in G Major, RV 532: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffeafe07e5dd97da3f1109091b32ebab81f4ce486e8d5f3dfd2295ac278693a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306003 — a six-check JSON result.
Vivaldi: Mandolin Concerto in C Major, RV 425: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f9e6cee8df579783a8ae1237d72ff9a163bd4e8eff7bf7b18a002732ec7aec. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306101 — a six-check JSON result.
Vivaldi: Mandolin Concerto in C Major, RV 425: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0febde932a9fed675471966fd87d02aad174ee20f2ac51f3d464dfeca240c4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306102 — a six-check JSON result.
Vivaldi: Mandolin Concerto in C Major, RV 425: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3f6e8297d7ea8b88921d3773a308dad1e9b9d87424ede7f7ababaf5199f520. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306103 — a six-check JSON result.
Vivaldi: Concerto for Two Violins in tromba marina in C Major, RV 558: I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175e5cc502311e3beec97461c8665e44843389cd7d1c95fe33708151919d6f71. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306201 — a six-check JSON result.
Vivaldi: Concerto for Two Violins in tromba marina in C Major, RV 558: II. Andante molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cca0aeeaf970366115ae57225736c389c0e40d4105f874c32660c164ae871d. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306202 — a six-check JSON result.
Vivaldi: Concerto for Two Violins in tromba marina in C Major, RV 558: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a903724cbdb3fee0a0f1ec9f195161f6554d3f63cc66562d781191efa13cc0c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306203 — a six-check JSON result.
Vivaldi: Mandolin Concerto in D Major, RV 93: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb6bc2e56e11af7546bf3f9db8c0107006179569c7df850e2b2d09fa78af41b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306301 — a six-check JSON result.
Vivaldi: Mandolin Concerto in D Major, RV 93: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324d7d7c96c43961d9cd6fd3a1a77fc8d570ee97266c0ffba89c74aa370c247c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306302 — a six-check JSON result.
Vivaldi: Mandolin Concerto in D Major, RV 93: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62faeb5c148a2356212ae12a7573914ed53f591589c18edecf221d047a1dd302. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306303 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa302232eb4967d74b8b53c78061ac7705ff0da870c0017753e1c97430c71839c. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208306002 — a six-check JSON result.