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 0xbfd5af6f27b04f008d2ccebe351b69490a3038f101ba93b1400a0f0fcf5876ec. Chain 2 (Bitcoin): anchored in block 953621 (2026-06-14T09:42:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21dda2c9-4f9a-4cb6-955a-2dc11111e206.json and https://artists.proofprofile.net/proofs/artist/21dda2c9-4f9a-4cb6-955a-2dc11111e206.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Rossini: Petite messe solennelle (Version for Chamber Ensemble)
Monteverdi: Il ritorno d'Ulisse in patria, SV 325 (Live)
Monteverdi: L'incoronazione di Poppea, SV 308
Monteverdi & Gabrieli: Easter Celebration at St. Mark's in Venice 1600
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 0x20d0cd3a06f843db2537369550d14379c651c514788fa7ff5215eca1f630ebe0. 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/NLY331802307 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5100d035fd2a907dc44b2f50058033133d01619bc4bc8cc20a8d2c6a40ab93. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLY331802309 — a six-check JSON result.
Frescobaldi: Messa sopra l'aria di Fiorenza
El cant de la Sibilla: Sacred Music from medieval Catalunya
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf513192a8347578983e70c27e2b223e85805b308c129d44b40f379c88fa4fff. 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/NLY331701686 — a six-check JSON result.
Officium Sancti Miniatis: Florence Antiphonary Archiepiscopal Archive
Antiphona, O orzchis Ecclesia 67, in dedicatione Ecclesiae (IV). Psalmus 94 AD Invitatorium
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778cdc33463bd6ffcb98fa92ab85a644d9388750d56d3a83bcd04e1a95421248. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/NLY331105951 — a six-check JSON result.
Antiphona, O coruscans lux 68 (IV). Psalmus 10: In Domino confido
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52b8e9ad4f7ced02c6c0a2a92755813e6fc867e85565b5a72377f2c60ff9d0f. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/NLY331105952 — a six-check JSON result.
Antiphona, O pulchrae facies 38 De virginibus (IV). Psalmus 1: Beatus vir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98f6add5afaf092b5276627c769a9bb4626562131277663aed36854afb1c7d4. 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/NLY331105953 — a six-check JSON result.
Antiphona, Nunc Gaudeant 57, In dedicatione Ecclesiae (VI). Psalmus 86: Fundamenta ejus in montibus Sanctis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993f99de401038a69aa425ba5e440a45e5a6f2ca085e44194decc11ee711df68. 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/NLY331105954 — a six-check JSON result.
Versiculum: Diffusa est gratia in labiis tuis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca70cb515ce68c0e46c554371c9a9da5f23b53dc6a0fd57525350231efe90969. 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/NLY331105955 — a six-check JSON result.
Benedictio I, Lectio I: De Libro divinorum operum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60135aa23d95a954d6d15a52572abacb3b3ea2fdfaadb3a259a3a77d3bd50a1. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/NLY331105956 — a six-check JSON result.
Responsorium I: Nobilissima viriditas 39 Item de virginibus (VI)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec71de5d38b610c2a0c3f9b99823cb4cdc3c819d3ac774a7eb13557b26f9cefa. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NLY331105957 — a six-check JSON result.
Benedictio II, Lectio II: De Libro divinorum operum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36c78048784fe197b51b846399f7057ca53838c2b240b29671d25bbeb7702b6. 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/NLY331105958 — a six-check JSON result.
Responsorium II: O vos Imitatores excelsae personae (VI)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa8e555e02cee2a735d450836132b0d10b7b8f38abfd0f1fa3f2e72926a857a. 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/NLY331105959 — a six-check JSON result.
Benedictio III, Lectio III: De Libro divinorum operum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2786d0d5dace0c01aa12a2b35ac439bef7dac438be103f80e2e53cb05ec4ff7. 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/NLY331105960 — a six-check JSON result.
Responsorium III: O felix anima 64 (III)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d90a9e98a7e072a7c3b5270d108fbc8e86a44c3977a2440fc74c39ad034713f. 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/NLY331105961 — a six-check JSON result.
Oratio: Deus, qui beatam Hildegardem Virginem tuam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bea34ebf279973c195114356628f40fc6f452f4fec1d148de5cf1cb64c1d3f9. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NLY331105962 — a six-check JSON result.
Quem queritis? - Un Dramma Liturgico nella Firenze Medievale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee643c866c868c2c8ffe57559e262b1914b4ae2a512f1a1023171f97b67c6834. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/NLY331106342 — a six-check JSON result.