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 0x8d1447176fbd045c6f36bc2a323eb6473c29be903f89fd9d4e0b7f3c14e29844. Chain 2 (Bitcoin): anchored in block 953950 (2026-06-16T13:35:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/24d6e4c4-554a-4b7d-bb6e-c4cca85365d7.json and https://artists.proofprofile.net/proofs/artist/24d6e4c4-554a-4b7d-bb6e-c4cca85365d7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Vivaldi: Arsilda, regina di Ponto, RV 700
Arsilda, regina di Ponto, RV 700, 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 0x60cfeb4141ef86fdf7fc211f24bf05d2dfff1dc4d32571bea6d0d2203e4b1715. 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/DEB200174001 — a six-check JSON result.
Arsilda, regina di Ponto, RV 700, Sinfonia: Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x288f6228585483963e0e2487d94754432cc7164f96a68351333ffdfa4e57867c. 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/DEB200174002 — a six-check JSON result.
Arsilda, regina di Ponto, RV 700, Sinfonia: Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb799518a739a3689814d44f7bbf16790840fd020cc5d71c918c9316c0faeadb. 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/DEB200174003 — a six-check JSON result.
Arsilda, regina di Ponto, RV 700, Act I: Questo, ò popoli
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8f98dfc213cbf6672affb51ddd4bd9218b539df32351fabfabbe5da3aa5156. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DEB200174004 — a six-check JSON result.
Arsilda, regina di Ponto, RV 700, Act I: Tutto il regno in lieta gara
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72926773cb1df9b51941e3a8b91b2c9719d21da571f82ae1bc9f653f2192046. 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/DEB200174005 — a six-check JSON result.
Arsilda, regina di Ponto, RV 700, Act I: L'esperto nocchiero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312a3feb6ef18e69e68b1e278e7ca004de365670fbe594b74c66161915b48a2f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEB200174007 — a six-check JSON result.
Arsilda, regina di Ponto, RV 700, Act I: Lo sento in questo seno
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc53db40b47e2d468f35280de45cc0607056a7855c7ba925afc1d4a70895fbce. 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/DEB200174009 — a six-check JSON result.
Arsilda, regina di Ponto, RV 700, Act I: Sol di Bittinia il Prence
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dd44d35c5d05dc6c47f7353d5f5288ecf6957f3083b0eea069175ff9ba71b8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEB200174010 — a six-check JSON result.
Arsilda, regina di Ponto, RV 700, Act I: Col piacer della mia fede
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7d78c40c38d376282fdc85650c164cfe39ab933388b588aa4820fbe9a7444c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEB200174011 — a six-check JSON result.
Arsilda, regina di Ponto, RV 700, Act I: Fingi d'avere un cor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3082df2414e6eb3c65af2eed3a28bf6aedae3f75c2c43625fe5aa02f11b3c702. 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/DEB200174013 — a six-check JSON result.
Arsilda, regina di Ponto, RV 700, Act I: La tiranna avversa sorte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1acad9d2308c9c1ccd8e0e6477383ac9caef2d5496790b5f5f4c29946d4c9d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEB200174019 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecdd3572c599824b9122e5aec52d62733fa16d3abbe08f33dd5e856e8d4bb0c3. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ITB292000016 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dac2fdce777987fe4c05a741591fe2f91f0dc3940fca7e05eefa2fb5dadce85. 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/ITB292000023 — a six-check JSON result.
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