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 0x77e05091a48a016b077c38fe6a388aeb06eb19dea45dcbb14869ef72e9e3c1e8. Chain 2 (Bitcoin): anchored in block 953710 (2026-06-14T23:32:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f112155-aece-4b69-bbd1-4139a20879b0.json and https://artists.proofprofile.net/proofs/artist/7f112155-aece-4b69-bbd1-4139a20879b0.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Rigoletto / Act I: Questa o quella...Partite? Crudele!
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 0x3dced62ad0e6544c61cf9b5cc57377f3ea23af258c7d77eaa52333a187b242a9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEF057930824 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91ce601d3ff19d9b04aeb19a90abb5fb06d1930df89b906beaa152c82176b76. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEF057930825 — a six-check JSON result.
Rigoletto / Act I: Gualtier Maldè ... Caro nome... / Miratela
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165f08d0a5351fe760f16065f7c1008832fbe32d78d850081c54ba4de68c98f5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEF057930805 — a six-check JSON result.
Rigoletto / Act I: Riedo!... perché? / Silencio...all'opra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7d69ffccb78db7cd3cfcb3f0527a03653b66760db17c4a641759a4bbf50b1b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEF057930830 — a six-check JSON result.
Rigoletto / Act I: Zitti, zitti, muoviamo a vendetta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f239fb6409bfc0614f27ab5d3111b4dc0fc7e33316f992628cd2cab6aee085d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEF057930831 — a six-check JSON result.
Rigoletto / Act II: Duca, Duca! L'amante fu rapita a Rigoletto / Ebben?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4031a1a86a0b96ab16ff12a79c18c6adda434ac1cfc48dc4f296f9e859d63d. 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/DEF057930807 — a six-check JSON result.
Rigoletto / Act II: Possente amor mi chiama
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4409806a5e886e1f9eec0f4480b79e0b6708479d8f129ee3d95bb9ed4b3271. 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/DEF057930815 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8583cc474611763a8e74c3734cab56a4d096142d2cd8f203e0c3e129f494b062. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEF057930832 — a six-check JSON result.
Rigoletto / Act II: Mio padre! / Dio! Mia Gilda!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb788e9677265cf154e6ef7453522a99511a6574a265fc47365cfee31ff488f0f. 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/DEF057930834 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165f08d0a5351fe760f16065f7c1008832fbe32d78d850081c54ba4de68c98f5. 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/DEF057930805 — a six-check JSON result.
Luisa Miller / Act 2: Il foglio dunque? ... Io tutto già vi narrai
Orchestra of the Royal Opera House, Covent Garden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d244132151ef3c491950065270c82bf56f9048931034a481c80171873c5c37e. 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/DEF057931140 — a six-check JSON result.
Un ballo in maschera, Act I: Zitti, l'incanto non dèssi turbare - Rallegrati ornai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0857f6d1cba1217369d40d48a1e0566d72747d3a6d0233b316598059f9ecb85. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEF058031323 — a six-check JSON result.
Un ballo in maschera, Act I: Finisci il vaticinio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103020b1895cacbed2b24932b934c0ebb1288e0cf9d0fda70f00a00f21f9d183. 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/DEF058031327 — a six-check JSON result.