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 0x27985782bf16125821acf1d07e3e3545d1b2b2daf81404e8ea453f6879b92595. 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/4f056804-c67b-4a7b-8984-6d4fd26d2e4d.json and https://artists.proofprofile.net/proofs/artist/4f056804-c67b-4a7b-8984-6d4fd26d2e4d.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 0xe786b5b34c91183ca9cf9203cecfa2f90d33984b6a9d17665100e5e9b4b6de12. 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/QZNJY2505593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef16db1623b737ec8ee7bb528c00eec39fe7a8abca25b0e7c19a54f75bcb81f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZW9K2267264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef16db1623b737ec8ee7bb528c00eec39fe7a8abca25b0e7c19a54f75bcb81f. 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/QZW9K2267264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f00d916302a455cb60e10521b1ea6c4eddd6477d35401b2a47f64348ca7b4d. 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/QZ5AB2402051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717a68558cd9bd9334613973ba69863ef490c3f7d6938cc7c9359ba5cd5f4d02. 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/QZGLM2458064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c56612837cfa28ca6b3c3294f658109e354dafa9e573d69c2cce57a3fd52ad. 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/QZES92213414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ab64b0f1a9f7af6a1d3a16e1ab08b7873fb7d7291b1c68842e71ee766b8799. 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/QZES92213415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d520ffa043a512cdcc217b8760d067469b5005e8e367ef9a53a14bbf364f4d0. 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/QZES92213417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d24f20e29810211ea77d467c37bf7d1440b83bb323d88403e8a6b2a48f3921e. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZES92213418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcdf4c5897d2c33556ceb8a01cf79c49c09237972d4b98cbef0f8c557dc47c87. 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/QZES92213420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8605c65df67ea660686ce731ae7a98c7ce9255252dd1f9bb076999bbdc38f085. 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/QZES92213421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5ab6fc652957a9733fa892a9ab29e073c2726ea510e581ef5bd1e114ea9630. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DGA0L2442452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35fab767b927f7e0153be725822331e8ce956ab1982228e982c482cd7da9d2a. 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/QZGLS2381393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e3ffdaaf5add17345962352e51b6d75afca20f177ddca797ad4533e2151cc8. 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/QZGLS2381398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e87065140713b48432c652d5e0b803b2300a90e9171aa2bbe0a9e5a87d9e20. 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/QZGLS2381401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d4f0d503f9427b165735d3b5102c4afacd8acda3634184df6b39e13d950916. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZW9L2321971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fcc716bbd8700888d4161acb14a8fdc6c788c332ee6b133286ba3811fd4f13b. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/DGA062481520.