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 0xe66ab63f99ed5ba0d28dde86f9ec0a5c94ecab8b489557b6e30c529ba59cb643. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c8c12ce3-3857-4154-a7ed-62a229ed25aa.json and https://artists.proofprofile.net/proofs/artist/c8c12ce3-3857-4154-a7ed-62a229ed25aa.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 0x924783a80f6f150e3625acab86430b37eeaf9f314633436ce6a40a8aa3cadf28. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6L2440840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1000716461d75b118a569f0d98d8d830426b4924eb052923ce87ff2284a3ec5. 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/AUG4Z2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7b733f5ccb2890b56a7b81ad0cae9a4b7a8357d4423a56d3cd58c39d6aceaa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/AUMEV2472224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74603ecaf842d0a7e0835ba400b665c60558ae6cc1557ad860871022b94910d. 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/QZK6M2449747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d6f7d8bb3da1be0be6703f813e70ca7869aaec24b3295eb6343efd9cc9525e. 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/GBMJG2413380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ada332ca0b6bd505cca31ddf315fed2bbfa699457260ba6536d4a3fb3508d67. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/SE6HN2418535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273f26b61887b68be91a062041a6285eec8fe4f20d85810f0ac02be4bb3fa75c. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZNWR2490700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a5bae9f68776bd75c55ee5e5ddaad077b9dbe9b6a7da5831d781cb9562c99c. 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/QZZ8B2398781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9774f90a0efe86ce8498e5d8b8d26889cc099d1d8f87752265b72e276e7ab7. 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/QZES92464198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c85914247c85fcbfdbf62ebb97d9e5622f3c90573b19699d71825a0ef68c667. 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/USHM22466999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9774f90a0efe86ce8498e5d8b8d26889cc099d1d8f87752265b72e276e7ab7. 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/QZES92464198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c85acdad5cb940c0d8aaf216ea17978d27f82b98ad3b7c0e3c134a05dd71b8c. 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/FR96X2306861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b33734635585dc927b23466ea52d4eb145666013cab99b2cfecbb1c092c0e1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DGA082227515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b616129e967726cf4233f97c073df38260c89013b283da0c995e09df1f4281. 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/CACWV2293693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe5326435d1de0985b8d669682ff43bbc27a90bd89267bab12589a4d66247e5. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/CACWV2298581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c89efac6a4fbc542689d46e08196a46f8435c36272c1d8683061541b048907a. 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/QZFZ32261609.