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 0xea1a83ea70ad65ce709a6ef8273ee60ebd4667ccd4f41201cdcb5d2281598c6b. 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/0b4738e8-b24b-417b-811e-a336e9d3c140.json and https://artists.proofprofile.net/proofs/artist/0b4738e8-b24b-417b-811e-a336e9d3c140.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 0x8c41d6d4ca222458e5bc645a566d5faea981eb3b92251e42f552e409cffdd394. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/USHM91731523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e16c5602604832310434b22d55cdf64233fb04190404133d11a3a7e2d0d9ab2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USHM81811906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd533abb3e15cf771b3fbc45edb7407e7670301ad16ae0c74d8541167cdb331. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QM6P42072838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9793e98169e453a8d6bd426ec58b17d5ac8fcf55f540316ad63ea66d443c70. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM7282041527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782c0a5da772874162be60227d382bd351798b2ef1ab3b848be6af4ada1df496. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM7282041530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d6891930f60ff67d694fecb6a396ec20084e134a5060f8bfd784ee55f368e3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/AUDCB1701858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e289dd9c1babb07e36ebaf3cd7e2f4636692c463bb910220dabceeb4f0ce5a3. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QM6MZ2231352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cd4cc8539e7fd5400edd0883769947f496cf218c358048d76df45d15b46b67. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QM6MZ2231347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab029a0d466e7bb4055fabc1b434bbd08c3d9094f59db87a6423b86946f6052. Chain 2 (Bitcoin): anchored in block 958124 (2026-07-15T08:13:46Z), 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/QM6MZ2231348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d1128291975868f56be768620ee71d179ba9354b79ae3bc2472c5f1735d3bd. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QM6MZ2231350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bee4abba076c970de551cc145ba04a6119797dee2703fd5b67258fbdf119e0e. 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/QM6MZ2231351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa28ee9add23ecaeff4df725b50f5bafcd6222e3cb7c0bcd337c8f1f10470f5. 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/QM6MZ2231353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85df2e8b3a81e4c1867b72cbae6623ffdd52430ae4cc7a8e6261ecc9327bb1b. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QM6MZ2231354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426fc153e5de5924e48774c4e0265e71dc3a89be6f5807b12d56dbb75d8eabd5. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QM6MZ2231355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5e3ffa27c1312f5288828b48358222835d096fcf4ac9ef062e78c32d99a029. 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/FRX202211141.