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 0x2b2c6016f39a196ab763e4b2a896532f133b036581428daf4fe47186e6d071a6. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0a0836c-6251-4415-9bea-6a9fc2b07e03.json and https://artists.proofprofile.net/proofs/artist/d0a0836c-6251-4415-9bea-6a9fc2b07e03.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Il Tamerlano (Il Bajazet), RV 703: "Sinfonia. 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 0xe7209a1e7b681db967219f887f9db348c45355c382e881d7fdc3b86c08180099. 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/FRZ132005010 — a six-check JSON result.
Il Tamerlano (Il Bajazet), RV 703: "Sinfonia. Andante molto"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfc1d4c1bd20b2e9190e9f9f3643bbfff6265d30ea96e32557a43127c5bb1b4. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FRZ132005020 — a six-check JSON result.
Il Tamerlano (Il Bajazet), RV 703: "Sinfonia. Allegro—"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb41a1700e97a3138600f0b05196744a19783d1367ab72fa0af9e3eb78b5153. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/FRZ132005030 — a six-check JSON result.
Il Tamerlano (Il Bajazet), RV 703, Act I, Scene 1: "Del destin non dee lagnarsi" (Bajazet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf7867542f8e470f60bbcb550451c6c32585614008b7ee1fb157f139a8dee33. 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/FRZ132005050 — a six-check JSON result.
Il Tamerlano (Il Bajazet), RV 703, Act I, Scene 2: "Nasce rosa lusinghier" (Idaspe)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9178530876d55a7c77da84ee17650404332629277bc0fb88fd4ad0b359339f66. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/FRZ132005070 — a six-check JSON result.
Il Tamerlano (Il Bajazet), RV 703, Act I, Scene 3: "In sì torbida procella" (Tamerlano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b4facb88421c9697853ffe63fc0cb5ae0faad2cc5f7886056aeb99f5f9d2aa. 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/FRZ132005090 — a six-check JSON result.
Il Tamerlano (Il Bajazet), RV 703, Act II, Scene 7: "Sposa son disprezzata" (Irene)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813ce781b06eb41ab36e7d43671de88e34e6b52af73a4490a8baf5f96a27e0c4. 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/FRZ132005360 — a six-check JSON result.
Il Tamerlano (Il Bajazet), RV 703, Act I, Scene 11: "Qual guerriero in campo armato" (Irene)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33b8db5dace01e203c4cc1fb8de5bd21250ce6faf282ed5ef80e9ae2b63108a. 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/FRZ132005210 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d0ec783d1ffb9b07b3985f90748e85db9d35f165cfbda1afa457ec1daf339f. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/FROV61820501 — a six-check JSON result.
Missa Solemnis: II. Gloria in excelsis Deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8267a7d571240b9736767f8d0e4e3fca5b4d1ef3b47d0e74593334f1d398042b. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FROV61820502 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a9b8fd31597447d3433f31bcf5e8c9f4ea56c8a2d782de6f8e9c094605b950. 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/FROV61820503 — a six-check JSON result.
Missa Solemnis: VIII. Et in unum Dominum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c5676f220462d2ae12e413cb91b20d15b6267338501b229082950df29a5b6a. 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/FROV61820508 — a six-check JSON result.
Handel: Dixit Dominus - Ferrandini: Il pianto di Maria
Dixit Dominus, HWV 232: No. 1, Chorus, "Dixit Dominus, Domino meo" (Chorus, Soprano 1, Soprano 2, Alto, Tenor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb734e0b34d10619d5223e7ebbceb73dc17f5abd495806d8bce034fe9f62b5123. 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/BEE022313001 — a six-check JSON result.
Dixit Dominus, HWV 232: No. 6, Chorus, "Dominus a dextris tuis" (Chorus, Soprano 1, Soprano 2, Alto, Tenor, Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0f0dcf5c2bfcc69e0d282395c4e02e7b8db7ea1fbaae8a5fa2e5cdddb9ae7d. 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/BEE022313006 — a six-check JSON result.
Il pianto di Maria: No. 2, Cavatina, "Se d’un Dio fui fatta Madre" (Soprano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ceb423af930fd6d191faca08b4bbf5a39fe9ba7e7f7873b53af5e485cb1c7c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BEE022313011 — a six-check JSON result.
Il pianto di Maria: No. 6. Aria, "Sventurati miei sospiri" (Soprano)