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 0x6e709a2bdb0d9a92bfe4b72e6a13a56332c1d98ed47eb497dd6d981322bf2675. 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/dfae4ed1-7675-44f4-bf39-a503aa0bd694.json and https://artists.proofprofile.net/proofs/artist/dfae4ed1-7675-44f4-bf39-a503aa0bd694.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 0x324b7fa5d49fd60d7d530c6c0f2fa9bcf36641ab6af53d05c77b0255b03a377f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BAA052020071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e5ab24122af2f6834a5fb320fc86c6c7f183a198d0e29165586370123a1760. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/BAA052020075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2a46d369cce8ae46f1cf0f838971793ac7060b9031caae03c3cbd94716bdbf. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/RSA221811317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e04df651218d9e9a1078941d0f5258fdcf6777cc71399f65942305ed641812. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/RSA221811319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826040ba392af0c81314dcc1c8aed8173612fbd4741e2f9780cd9e8504ffc044. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/RSA222010167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f988d3e56de611467ac11c44c20f1ac53434746eb53faed7fc3f762af7f5080. 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/DEKB72050591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c6ef4242e6df2bb1ffbb6cfa5670a172dd5999d7a06ed17ff0d1726f98d5d8. 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/RSA222092295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de6ce5f6633ad9064be4ded56d7338b023fd1624c2d0e16b1fb6f1028cafc74. 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/RSA222092301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ac1829750268ace797ae2ec9771122555411b95cf74ceb10a8e29dc426b6c7. 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/RSA222092302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae1465ca8499bf9f33bf780b1eb6fcc2f467c9e0aea12a2f9c9dfea615f9b27. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/RSA222092304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fd5ec391cf55d49ef5fbd4734f71443b7db89fb9afe5cd15a37aeba07ced3a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/RSA222309201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf29e8ec0d80e33d9bec45d890a21d47ae1e8033654b3ee726c5ac90cc6da11d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/RSA222309202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe68a7a5598875487327c161ca311fe17831ffacffe9446ffab8fcf5125091a7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/RSA222309205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250ea7bd31669a46c4f8cbc9035eca5f38f0dd68f87b954395f2e9c44dd8d452. 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/RSA222309208.