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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5f3ad1ae27513fff24f95e45073b6e0d05dc29eea1c84df3fbd4ffc9cfa201. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5a1b3861-9a72-4347-971b-80117bc5e37b.json and https://artists.proofprofile.net/proofs/artist/5a1b3861-9a72-4347-971b-80117bc5e37b.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673b229f31b0a4d03ec5908f0972315aa0e99fa495010afca93435013f2e7acb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/MXF365603397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b74da6113911bb8f89eb2d5e965a75539f62b2a538e7b55ff4211015fd6437. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/MXF365703812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd37e22dda19c5ef4484cd4f467f38bea2c9c49dcb60c8b5a31cbca3d64f4c2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/MXF365502642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696c1f5264e149626daf2a24f1e01109add1e66afdce4d8a50dd52f84cc4deac. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T16:25:54Z), 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/MXF366006622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bc2cc50fde1126c546214c40b2aa1e95f0a46a58436c08433a26e30d5c37c7. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-20T01:34:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF365402371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa576cb72955a0ff7bdd8d6c37d3f3d7ea5ad0c22098a389c423ee9b41e38fe. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/MXF367421153.
Colección De Oro: Tres Ritmos De Época, Vol. 2 – Politécnico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701a5deb71bfe9a4e35e9e0f88624475a7e1d1041555b4f6f07635a62b181087. Chain 2 (Bitcoin): anchored in block 957653 (2026-07-12T04:35:02Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF367421146.