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 0xa4e707e76c71c6835a7823fd074d9b3269403ef2e2c4e06867fea8bfd153aea0. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5cd01d1e-d489-4e51-959f-c982691b9432.json and https://artists.proofprofile.net/proofs/artist/5cd01d1e-d489-4e51-959f-c982691b9432.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x64054bfefc43eb4009ffd1c5e32585032be627eb0a6a2a4821f35f50440b827e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0b817f8380889e341d4363d6acdd2c07365824fb77e17413d3dff9ea034b9c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200602.
Missa pro defunctis (1650): III. Symphonia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c21fe277ce9f865bb3ccfffe5850d72d1c71b8b6bfdb1c102988f1ad0c54d0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188564a154fcef1a54fa89a2face702f7c1ae9077be5551929aa2adc71d9fe20. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200604.
Missa pro defunctis (1650): V. Dies Irae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90e9db2feb164a8b0eaaceb162ae6c85e95f31109bd0d14706cffa59f373f07. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200605.
Missa pro defunctis (1650): VI. Symphonia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb536100d42a2a43f255f4d3ea6486c64b3312d540816cbca347f2f0cc59a62. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200606.
Missa pro defunctis (1650): VII. Domine Jesu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ccc0f23027d3b5eb936eb0c57d425645e2c1362ef8f85de9e1fad12cd4caa3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200607.
Missa pro defunctis (1650): VIII. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6302100cf629dc5977b3a5ab3fad07a900738b0cf891d5416231ef3681d1dace. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200608.
Missa pro defunctis (1650): IX. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96c763e8cd5da1fa88eed9295b46b8d3d038b8f7be1ea47702ef1ab3e2019c7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200609.
Missa pro defunctis (1650): X. Lux Aeterna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85327274418a29f1f3bdd13a3f5245295147397276f7731318970a3ba40ae29c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8010f2dd1dd237f8a3f562f1ca5ebb932b8c6bda60ab59578d25ce41e992995f. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422200611.