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 0x963f215cdf7bb27ff0f3139f55fefdfebb9bf0e27d398424b92f7708d702f068. 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/531f9f00-1136-46eb-bcbc-e8ca7842dbd0.json and https://artists.proofprofile.net/proofs/artist/531f9f00-1136-46eb-bcbc-e8ca7842dbd0.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 0x80cf8a8e9a9d4c54d0446500ef490b84f8a23e569d834824210bf3f78e47b624. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QMPKX1795277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc911ecbb6843fbc32da78694e7a726b90adea66730258f4994e56ee1477351d. 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/QMPKX1795276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80cf8a8e9a9d4c54d0446500ef490b84f8a23e569d834824210bf3f78e47b624. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QMPKX1795277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbc215a0ad7c6ef9787b9df8efb1e71b083304ae5068661ef5b70e9e0be8401. 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/QMPKX1795279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebc92d41f32b888fbbd469b7cb6467e765fe49c322d70f358a256176448db29. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZ9Y21743564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b40c2fb2e077295c55ddf595a3aca1e1df4fa42d1662ec37a5b57abf102d9d2. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZ9Y21743565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441603ec064d86f24ee6626eaa1a8c648e9e3aaae13c89ba5feadbd812169a56. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/UST8K1831942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecedd5f0418505d6ba7e118c69b7a101a1903f01f29596a8b543f13f9a317880. 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/QZES71892492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc92d0f816390e0fd58e0d2326682882adc993185bb1e773a6dcac348f90a6d. 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/QZES71894882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2bcf92ebd5e1b0a677fdf0f0082cd16deea2b86802a333439e87425ab05112. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZES71894883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7992dd47d33a439a81460b055f1523c2cbdc25fb3919b78e7e2c3ce42486233. 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/QZES71894884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713bf7ef6215afc457e9f66130843538f92b677b143f7539df55d26652a1ea6d. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZES71894888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150a7676e1db778c5e11f410ebde0893ef0b30db5f6da203ec26dc342fc2196a. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZES71894889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c031d64091fa81e3e44237a34cd9288b1a13d2a1d8dd05ab465733b6b2fa5f. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZES71894890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d186aa63868dcfac5366c5989ce20c8ea9789656bfb89920342856b97a0e28. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/QZES71894891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4311156e3fa55560c1efd15d2240f02a35550e33471bb34f20b48ad100ae82. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZES71894893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f677bf6fcfc08c2a01cd6890e21eb87f00c3956705c48505d779a3f2dbf3b9. 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/QZHNA2010720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe809f75ffc2dfede044346d74ddffbcafc2187310aa2e0aa5df483730eec056. 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/QZZ792497613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1500467e94f8edc416b4a8a6fff39361a759dd6c9de688ce99fc99ca8eae97bd. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZZ7L2429979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3695642e909481700aaafe6f326e9647d9989a4df1f42b469433ccbeac6a540. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QZZ7Q2494585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f73bb434af84faca38338b702a864afa23e457a703615e76ee9a7bd67cf00c. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZZ7Q2494586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a9185c63b1dc2e6e4d971315c60d6b71230a6346b0fd85a87bf70059f4bc24. 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/QZZ7Q2494587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e4cdf4215dd0663c3ae6daa393702158b84caeaf448b3416f53ec98090f842. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZZ7Q2494588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67c07978b3698b20ab35785746c6f0315ddcb762dc9640e748895d642f69522. 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/QZZ7Q2494590.