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 0x292e8805191c98365af8bcdb413562ad432d76a04f011ce59d58c5ee85cc9482. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b3d4666-9bc6-4ba1-99a2-be9f5dc2ad50.json and https://artists.proofprofile.net/proofs/artist/4b3d4666-9bc6-4ba1-99a2-be9f5dc2ad50.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
12 Concertos, Op. 3 "L'estro armonico", Concerto No. 10 in B Minor for 4 Violins and Cello (Arr. P. Romero for 4 Guitars): IIa. Largo
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 0x230a44e8a655b2d28650a3334c3b09aabe8af7f2e46240344410a6e1ac497522. 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/NLA506700691 — a six-check JSON result.
12 Concertos, Op. 3 "L'estro armonico", Concerto No. 10 in B Minor for 4 Violins and Cello (Arr. P. Romero for 4 Guitars): IIb. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7596dcd7eda1bde2a3c6dbd4cab0b4a3e71e35b3079bd10f1b8267a343d8dd1a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506700692 — a six-check JSON result.
Mandolin Concerto in C Major, RV 425 (Arr. P. Romero for Guitar, Strings and Continuo): II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10298f61fee56e65074fcd55bbd32f6601e0039e53b0386299bfd8ab64d8aa6d. 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/NLA506700695 — a six-check JSON result.
12 Concertos, Op. 3 - "L'estro armonico" - Arr.for 4 Guitars Pepe Romero (1944-) - Concerto No. 10 in B minor for 4 violins and cello: 2. Largo - Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6c11875485d42f4f381c74121870c19ebb343d05d99338ad0eea7355617b96. 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/NLA506700750 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7596dcd7eda1bde2a3c6dbd4cab0b4a3e71e35b3079bd10f1b8267a343d8dd1a. 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/NLA506700692 — a six-check JSON result.
'Concerto alla Rustica' and other works - Vivaldi
Concierto Andaluz for 4 Guitars and Orchestra: I. Tiempo de Bolero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c28c8f63e84196e89a3cc4d3198404d5e91f5559d4123864a344899d534bdd8. 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/NLA506700746 — a six-check JSON result.
Concierto Andaluz for 4 Guitars and Orchestra: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa976e179d506f3983eb9bdd25b92954fc7fa63eaa4e3c722a4ad547b51ea0f63. 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/NLA506700747 — a six-check JSON result.
"Baroque Summer" - Handel, Vivaldi & Rameau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7596dcd7eda1bde2a3c6dbd4cab0b4a3e71e35b3079bd10f1b8267a343d8dd1a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLA506700692 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230a44e8a655b2d28650a3334c3b09aabe8af7f2e46240344410a6e1ac497522. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLA506700691 — a six-check JSON result.
Rodrigo: Concierto Andaluz; Concierto de Aranjuez