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 0xf32b1b64cf20cdc19b2610ebf209d7e4b2d0ef1b6f72168150eb69a1674bd01b. 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/1b7dfb69-44c2-4f3e-9c1c-caa811467179.json and https://artists.proofprofile.net/proofs/artist/1b7dfb69-44c2-4f3e-9c1c-caa811467179.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 0x0247a4ec92f6cf5da58d2a4ed2218578cc198c9bf5bb52046dae30ff0bf5380c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ32016233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9e4d7fe54f80b49a3fba7315433c173d99975aa419fb063999fd69f4bc2e4f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FRIDO2110394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b273e22d2f1331876b7e9af4f3dad84189b662c8bddc4ee597a8ff6331ff7b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FR9Z62100326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cddc330238cfde57e6b762fbac37e1177a0432a4180b85c4ad42b60063339ff. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRIDO2212200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c984c2087fd93cc243687e426a5daf03b6f174aac671c16cfe295aba9e7fba. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T15:49:33Z), 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/FRIDO2212484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cddc330238cfde57e6b762fbac37e1177a0432a4180b85c4ad42b60063339ff. 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/FRIDO2212200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c624ba44ab7a5af9206a619a020d08ff2090c421651e301d52ccc046fedb802. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:45:35Z), 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/FRIDO2311320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551f45de34468dd80e0405c58ec6a6a6f752c8895211dc86c346609ab611e1d7. 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/QZVEM2333347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4433126440c5e24c925d45c1e4612ce8fbe5334e8d49e0f5de4ef04b29b691e8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA062266323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2923c13147942608ec5a9ec4abe7c6026a4d8634c0b53c1035522210c71419. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2226499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de9b754a1db9e71b59bf9a2c9ebff47be6da01e3877b112e4bd7bddf37bd49c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAZ2302899.