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 0x69ef4ab830499e221785aa0d16d1d3149ba394f71567156987d51d3e2d3c9a69. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d76a549c-df78-40ff-b5ec-67e646cd853e.json and https://artists.proofprofile.net/proofs/artist/d76a549c-df78-40ff-b5ec-67e646cd853e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Seydelmann: Il Turco in Italia, Act 1: "Girate quel guardo" (Selim)
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 0x0a6f488462679275d2025ebe6ed26eb4adc39fa84b9c241e48f2a7e33f76c7e6. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/GBAYC2400208 — a six-check JSON result.
Cherubini: Il Mesenzio, rè d'Etruria, Act 1: "No non cercar per ora" - "La gran vendetta ancora" (Lauso)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab27b6b6237bd683638335598e2fbe0d45d1d371ef78d8f10be9d134d6462d8e. 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/GBAYC2400199 — a six-check JSON result.
Mozart: Mitridate, rè di Ponto, K. 87, Act 2: "Lungi da te mio bene" (Sifare)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f0537cebac1b7de219cb9f75f0fba6c4da44e77d228eed81203a35d380f552. 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/GBAYC2400200 — a six-check JSON result.
Mozart: Exultate, jubilate, K. 165: I. Exultate, jubilate
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344ca387969552a021b9ec43f6d5099c505f98f2fc46f0b9283c4ec4aeb16595. 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/GBAYC2400201 — a six-check JSON result.
Mozart: Exultate, jubilate, K. 165: II. Tandem advenit hora
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74ce1a80a5d00c9b82fa4382caebf9a863f85079b5502b4d068c727ee15d887. 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/GBAYC2400202 — a six-check JSON result.
Mozart: Exultate, jubilate, K. 165: III. Tu virginum corona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd387a25794319ca6d7ea870d00fc3187723fb1e613a59fd6fbb94e45d7b39f. 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/GBAYC2400203 — a six-check JSON result.
Mozart: Exultate, jubilate, K. 165: IV. Alleluja
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b312380cc0338cc4a79b911e83c9d22ae8b9ba7793446645e6eb7917265657. 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/GBAYC2400204 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743b7bf413c45d4ee25d42e2bc819a9c2e2a5481f66c9f5ceac01b467327c9a8. 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/GBAYC2400205 — a six-check JSON result.
Caruso: Il fanatico per la musica, Act 1: "In mezzo a mille affanni" (Lindoro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd696a845577cdbdb996c1027d895feddaa0f40d25b43a01077eee17ffc25ec43. 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/GBAYC2400206 — a six-check JSON result.
Mozart: Grabmusik, K. 42: IV. Aria. "Betracht dies Herz und frage mich"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48227edddcc0c1996c9618495e76e97317493319529fe2e97cf29df0c362fe48. 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/GBAYC2400207 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6f488462679275d2025ebe6ed26eb4adc39fa84b9c241e48f2a7e33f76c7e6. 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/GBAYC2400208 — a six-check JSON result.
Reichardt: Andromeda: Accompagnato. "Voi sacre piante" (Perseo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a4f2f9f13ed974e196dc9c372a53c7cbd65e5320dbce0b6494ee9e2e103df9. 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/GBAYC2400209 — a six-check JSON result.
Reichardt: Andromeda: Rondo. "Deh soccori, o padre il figlio" (Perseo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4551df45c222527aea417ad2015c2afbdba8811e2a666832e357424aafcda7bf. 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/GBAYC2400210 — a six-check JSON result.
Zingarelli: Salve Regina: I. Salve Regina
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc77c4c3b2d201dff1048f4439cf7625261fcf80eb093df483078d62b8d5c558. 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/GBAYC2400212 — a six-check JSON result.
Zingarelli: Salve Regina: II. Ad te clamamus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda5d50222694d1e68140b5333add801dbd92efc5c5b317682c403afbd492356. 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/GBAYC2400213 — a six-check JSON result.
Zingarelli: Salve Regina: III. Ad te suspiramus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a70bdcafdb5838522678ba296d50fb3ce16780d42120562a6766ac9e301ad24. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/GBAYC2400214 — a six-check JSON result.
Zingarelli: Salve Regina: IV. Eia ergo, advocata nostra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e11fe509de06f81062ea51f1f2373d9550c6f82d62c4938ad9573451993553e. 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/GBAYC2400215 — a six-check JSON result.
Zingarelli: Salve Regina: V. O clemens, o pia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed9ca8da16033cf3381aa40976c0e9735816f214ae1c65721fb2badeeab735a. 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/GBAYC2400216 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01185bc66c2d7f70f05be782e848bcd555a5eb318ac0caaceefee28642c45d3. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBAYC2400217 — a six-check JSON result.
Cimarosa: Requiem in G Minor: XI. Preces meae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78a386fd8d7a59b4c28c2d2700a3d9acc39a47cb8305d1b504271c318a714f0. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/GBAYC2400218 — a six-check JSON result.