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 0x7029c8b2a689ee492e0ad6bb67ecc0cb64370d5937d0589b22de80267db7eed6. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eca24e2d-88ff-4e53-b4f7-06f0e492c584.json and https://artists.proofprofile.net/proofs/artist/eca24e2d-88ff-4e53-b4f7-06f0e492c584.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 0x912e45431697120854f67aacec09bc9fc08c7cffb25e71deabc8104b58a5fa97. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NOLKH2405020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd84c3f1eeb86df576d8a49e0d8660c26268bc73f4729e19b4eff125b2698f52. 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/NOLKH2301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ec42fcf4ff8bb053f8aed30eaef7fb4538c1a6bce064976ae22de62dfa5d47. 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/NOD0R2309010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fceaec703fc18161dbe9a832c598184471d9cea65554adde61f8d2ee43a7f4f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QMFME2182447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86d85f8f59a8acd405e995a2c62ff302320ff5406baa373f9600d2264f4eaaa. 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/NOLKH1901010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342c92487d02e9a1fba3471cc7fcae8124553a8a779cb2315cb5500c304b2774. 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/NOLKH2506020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e01e595e59c448429f1dcf39d8d47fc1051e705cd3f18df0157b1649de824c1. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOLKH2503010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87001c8afc5f1924f572a9b68b736073ed02a501faccf4ad1481eb002e7cc767. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOLKH2506050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca53689c5336eb4441eb9495f40cce80e1f3cca2675dfe88aa0680c5f5c9e96. 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/NOLKH2506060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60bef6ec23b9a4d9bd12beb4f5a436b67ccadb9efb3d374a33fc053a51b5f6bb. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/NOLKH2502010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987bbd68ec9a9902f55d01d601f26799df5c550b498412c9ed49c19b451a8eb6. 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/NOLKH2506080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e01e595e59c448429f1dcf39d8d47fc1051e705cd3f18df0157b1649de824c1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOLKH2503010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60bef6ec23b9a4d9bd12beb4f5a436b67ccadb9efb3d374a33fc053a51b5f6bb. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/NOLKH2502010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f30c4c13598080f771038514a18a064705abbb5cfd2749a464785cb7ac9f932. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NOLKH2501010.