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 0xa88c455d70e8fab32cc84ef51f0801e51aaba57c137e354449949dd5527e1552. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/72f7fedf-eccf-4b2a-b068-193c71d1c2e9.json and https://artists.proofprofile.net/proofs/artist/72f7fedf-eccf-4b2a-b068-193c71d1c2e9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sinfonia Iii C Major - I - Allegro Assai
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 0x402f216e050750595581af8049e5b936d9b2d54c5d7aa6470da274d305f27322. 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/USX760801401 — a six-check JSON result.
Ottavo libro de' madrigali (Madrigali guerrieri, et amorosi ...), Venice, 1638: Altri canti di Marte e di sua schiera (sv155) -Part I: Altri canti di Marte e di sua schiera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a7c0bb31e05d341135e140ab71d0a22c588493660ff68c48563830e5f31d9d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USX760801403 — a six-check JSON result.
Ottavo libro de' madrigali (Madrigali guerrieri, et amorosi ...), Venice, 1638: Ninfa che scalza il piede e sciolto il crine (sv160) -Part II: Qui deh meco t'arresta, ove di fiori
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d07b93f81656b5ed567db03754753fb807cca15c0a014ed44d0d899e5a2906. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/USX760801408 — a six-check JSON result.
Ottavo libro de' madrigali (Madrigali guerrieri, et amorosi ...), Venice, 1638 -Dolcissimo uscignolo, 'cantato à voce piena, alla francese' (sv161)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe1c3f7bb4b506f8df28a7472c753aa685faebf3b5b50697ff2d17d2589a7b0. 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/USX760801410 — a six-check JSON result.
Ottavo libro de' madrigali (Madrigali guerrieri, et amorosi ...), Venice, 1638 -Chi vole aver felice e lieto il core, 'cantato à voce piena, alla francese' (sv162)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59350effd464da5475d758514ce93058cb190433698b0886539162bb84a993b9. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USX760801411 — a six-check JSON result.
Ottavo libro de' madrigali (Madrigali guerrieri, et amorosi ...), Venice, 1638: Lamento della Ninfa (sv163) -Part I: Non avea Febo ancora 'rapresentativo'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17605b4b98c1f818ab69e69a18e1357238afafaa708a15abd76470a1ee1fec2. 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/USX760801412 — a six-check JSON result.
Ottavo libro de' madrigali (Madrigali guerrieri, et amorosi ...), Venice, 1638: Lamento della Ninfa (sv163) -Part II: 'Amor', dicea, e'l piè
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751ba8d8ea048dc68e385ac762fa47c1b87f3d2b35ee579aba69cb722492d026. 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/USX760801413 — a six-check JSON result.
Ottavo libro de' madrigali (Madrigali guerrieri, et amorosi ...), Venice, 1638: Lamento della Ninfa (sv163) -Part III: Sí tra sdegnosi pianti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc375d2f0198de5ae978cd8c8deb7c2570f62c840a62d27ed94bafdf52836af0. 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/USX760801414 — a six-check JSON result.
Ottavo libro de' madrigali (Madrigali guerrieri, et amorosi ...), Venice, 1638 -Perchè te'n fuggi, o Fillide? (sv164)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e10af774756d0a31eba906c628d1701d21046e2462bcead3bce50922a3abb7. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/USX760801415 — a six-check JSON result.
Ottavo libro de' madrigali (Madrigali guerrieri, et amorosi ...), Venice, 1638 -Non partir, ritrosetta (sv165)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75174334ddcf686e5586ed6e6616675c4906988a421e732d21262164fafd0ed0. 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/USX760801416 — a six-check JSON result.
Ottavo libro de' madrigali (Madrigali guerrieri, et amorosi ...), Venice, 1638 - If my Celia could persuade
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4b88f5adbab28199d27ec7a98c14610f215d87eff3d85d70898869a8bbe56a. 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/USX760801417 — a six-check JSON result.
Madrigals to Foure Voyces (1594) - XVIII: Ho! Who comes here?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a870224bac4929be682f768948bfe26f9f4e0d6e8cbf8edefc4c862d7958f2. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/USX760801418 — a six-check JSON result.
Madrigals to 3, 4, 5 voyces (1597) - VI: Cease sorrows now
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc93a262470c516314ce74f2bbaafabe07c0fe1f1fb6a82b4b147f3633f3021. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USX760801419 — a six-check JSON result.
Songs of divers Ayres and Natures (1619) - IV: Mother, I will have a husband
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4a1c4f13824deb190b4dcb9ea0644a76efdc58ce7ce0575c82a834816113ca. 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/USX760801420 — a six-check JSON result.
The Mulliner Book - In going to my naked bed
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3921fb6a33f66c401f33c7ca1169de59ee43cf323dcbb3a0507721effc56b223. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USX760801421 — a six-check JSON result.