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 0xafccd80498eebc6976eb573e26c4347cfceeb06f283ef72fa135f73130526721. 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/445be73e-bc43-4b81-85c6-1d9a2109474a.json and https://artists.proofprofile.net/proofs/artist/445be73e-bc43-4b81-85c6-1d9a2109474a.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 0x0664a54dfbdef8622b6ea01a86e5a2df2cf3682491e1c87d8d6749791657b6c5. 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/QZMZ92251747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800992255182912a32225470c27521059b803a25ae29065ee3f1d14fc0fe6597. 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/QZW9L2275916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983f83d2399d8bc5d5dea0f3e8e5a07d7a5fa96ecd1e6f43666911a6a04f3bbf. 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/QZTVM2262912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876e75ff6ac61ee66bf818b804c381c8fc7af9e27636f37cd66c249c4850ad2a. 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/QZW9L2262034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad453a989026762c8856dab06c27823fd0e1bfb51cbd34d356ee085158a4fbe. 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/US7VG2322470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1341001583690512c68a83ce493a5f95bd9f0335fd525a39ab03409c9150d757. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US7VG2322471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d948d0bd13ddbf473b842f1d83992e81093ad8b02f6124fc17be161f19fab7. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZYFZ2384059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3007738925f6294954df21c0a3b3c69d09ac34ee1d13da271fd757dac19f534. 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/QZYFZ2389392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57565285246f1a51524d40edf2d5d802c99be2318bf79eeab6a85bb79420342c. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZZ662365389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856f94f4944657035fb149669a049c651616af14d2858ec2042523efa7340e05. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZYFZ2436537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9cabce78eaeec21e5a959f33ad00a60a14a89aa6ac62f2966ed99a4d03eff1. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZN882423785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3856214428dcbcc73c880534b719d06e4a19eac3d56e90f3e7342297aef831. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWDW2574619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f6d6d3b25e2446eba04a52df29090ccc832e4089d943538afbc8d4badc3928. 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/QM4TX2232174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f9da54a9c3c30bfac0c79674f0b641f4fa2bec08af9ca58518a87b8054a44f. 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/QZS7J2267905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53542fd01dca3c6127b7aceef3cff6dd3b66224a0c8e4076414e070ec271c55. 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/QZWDW2465119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44a2d5f0d3d5eb46f28453edf05a49e6326edb56b3b70aee47f0bc13a9dffeb. 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/BK4DA2507531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc52a9fd739ce2373108e476d0fc08f1f5b1a6de91f2ac48d10b6ffb9dae872. 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/QZMEQ2281353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x606865862e4038e955f50021a5655021b9bedd6fe03928fa3b086a007a7fa36a. 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/BK4DA2437589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18c101b4f23a2de10a804a3b717b6add7f4eb906d3521ec584ceb5fb769a717. 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/QZTPX2131804.