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 0x4737b31e608c978755d340e1bf0e5bf4bccec0a7bb205c0ca2e3b734e3be0ca2. 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/15655b89-c75b-4d74-9135-9f3bf8308a45.json and https://artists.proofprofile.net/proofs/artist/15655b89-c75b-4d74-9135-9f3bf8308a45.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Corelli, Torelli, Handel, Manfredini & Locatelli: Famous Christmas Concertos
Corelli: Concerto grosso in G Minor, Op. 6 No. 8 "Christmas Concerto": I. Vivace - Grave & II. 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 0xd09317a15c10010b49620b826da2cccb5aa3066a677fd1ebb86a8917f4f24830. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ207505201 — a six-check JSON result.
Corelli: Concerto grosso in G Minor, Op. 6 No. 8 "Christmas Concerto": III. Adagio - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22820414ded3e1841692091ea2b08058df7aa4aee20addc48636c344caa6c6f8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ207505202 — a six-check JSON result.
Corelli: Concerto grosso in G Minor, Op. 6 No. 8 "Christmas Concerto": IV. Vivace - Allegro - Pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8704e9d56eec5809a5f0b7e5a68018ec857a2ba3c1c87821ab6e41fb15d4b69d. 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/FRZ207505203 — a six-check JSON result.
Locatelli: Trio Sonata in D Minor, Op. 5 No. 5: I. Largo - Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d8c422faf6b5b3c82e4f82b336e327619be2a87f4ff9a445b0e2b4929622b5. 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/FRZ207505501 — a six-check JSON result.
Locatelli: Trio Sonata in D Minor, Op. 5 No. 5: II. Pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28e2e34b3272f3cbf95d391b6e71c906cc256e96eedbfb2c752a2fd0caf20f3. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FRZ207505502 — a six-check JSON result.
Handel: Messiah, HWV 56, Pt. 1, Scene 4: Pastoral Symphony "Pifa"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5edd2a6de6d28e5f7b6d3fbbfeeddb7d1f6e8e821e304cb8972fa31a42a80110. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ207505600 — a six-check JSON result.
Corelli: Fuga a quattro voci in D Minor, Anh. 15
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eef8494e0b70cbffe012f4d2f91a86a05a1b7035a8d1f365fec7afee3eaafe4. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FRZ207505700 — a six-check JSON result.
Manfredini: Concerto in C Major, Op. 3 No. 12 "Pastorale per il santissimo Natale": II. Largo & III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86533ec11a83fe4bcb1ceaf2485291003bf97fe143df07caa8dc255ad4cb733d. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/FRZ207505402 — a six-check JSON result.
Torelli: Concerto grosso in G Minor, Op. 8 No. 6 "In forma di pastorale per il santo Natale"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff0aa6e809f3182aade0d94fc32e114258fcea8c4ae78881718e5c977d1b722. 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/FRZ207505300 — a six-check JSON result.
Virtuoso Baroque: Locatelli, Vivaldi, Manfredini and Tartini
I. Allegro Molto (Concerto for Strings in A Major)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687054efce4ca3d370d428f2a397a42634bf1a6c8c432849bf9f47f8d445b5bb. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/CH0569600504 — a six-check JSON result.
III. Allegro (Concerto for Strings in A Major)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1137c0cdcb1cd9b7281fd031f0862b383c8e7f18a56a4333c1571a31384a3da1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CH0569600506 — a six-check JSON result.
II. Allegro (Concerto for 2 Violins in G minor op.33#10)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e3c8d0e0bf5c346667c5aade777204d05380987187b4e376680c51b886e15f. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/CH0569600508 — a six-check JSON result.
IV. Presto (Concerto for 2 Violins in G minor op.33#10)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c1348fc47a0b41d4565a8c7d320bfd22386c525e55ffb9d02ec0f71e723282. 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/CH0569600510 — a six-check JSON result.
I. Allegro AssaI (Sinfonia for Strings in A Major)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c25722d0bffea99c1efe65d4d8460d84a6ad67344a651e413d0fee8a0203d3. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CH0569600511 — a six-check JSON result.
III. Menueto-Allegro Assai (Sinfonia for Strings in A Major)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707d0f6c121c1c3ee8895b2c74f6878e579de09a29b74f712ec8c4d6e067f8ff. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CH0569600513 — a six-check JSON result.
Concerto Grosso in C Major, Op. 3, No. 12: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fcfd4483ca80feea060cee927b93c98aa4f42882158990b1d3ad6e6bc9f120b. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/DEA559033395 — a six-check JSON result.
Concerto in C Major Op. 3 No. 12 "Pastorale per il Santissimo Natale": 2. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508a3fc44e0a7ceedae17bf36d32b65a42063c7101336b58a7293435812ac45d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380001015 — a six-check JSON result.
Concerto in C Major Op. 3 No. 12 "Pastorale per il Santissimo Natale": 1. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6d8e40bdd26fbb930b67b8f25535f956562437cbeb2003fe09c807324b4341. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DES380001014 — a six-check JSON result.