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 0xf4e7f2bfe5551234c2794ab08c3db4914ef6036c09ead6f36e2410df121e8789. 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/8d6d5d62-9b2c-4ba3-9132-68c5abf8dce9.json and https://artists.proofprofile.net/proofs/artist/8d6d5d62-9b2c-4ba3-9132-68c5abf8dce9.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 0x725b4e04c08de38bf36b75bafe7dd906dc3068610a2c83a87fec91e9d6f7ca58. 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/NLH3Q2000705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616bd7cbe77211fe5235135f3c59c21c6bc6c7330c6247ca4315fd3b21dcdf12. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLH3Q2100902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba4571753834e18313beb73ab9f0b6c44c6b85c877091d516c9590314581eed. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/NLH3Q2101009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28dca81bc57e285edc6171b3b61e99bdb396e57aba5266c91b2b380c572310c9. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NLH2L2200352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0458cf444e569650c722c20baa2c7e70ebd25bd67a2df4ec090a00ea62fc1b4. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/NLH3Q2300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe630b4169385848a0c9b630a461208b61b0f2011efdbb732bcd6c312abe661e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/NLH3Q2300061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7479f8c346f7b7b873ac95f51cf82d9c7f0e669f123fa0e5b208f074c64f3f5. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/NLH3Q2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf391600704b5047efeb864b646fbbb0fed6dccd92849c807a624ebd8f11dc42. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/NLH3Q2400061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6edc34837282ad5908095e0bc4123ef95b1ca0e002b44686b1862428eff8cec5. 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/NLH3Q2100875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1c863238a03b0d9e3112f68aef4abd89003d3e741a13a8b763a77a03d133ae. 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/NLH3Q2300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60a28d01b1731b9a228953621a70d1739ff9e72668f2a00ad40f9f7cdf18ac9. 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/NLH3Q2101089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de0fd44199962dd3bc8f688fce01f69f4e12b0091b102337855440c8b399546. 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/NLH3Q2101123.