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 0x59041389f3422619c66401cd074864a1dfd0c7244f836743178f5e8b653893b0. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/74818c6c-a8de-42aa-b055-14297d8c2127.json and https://artists.proofprofile.net/proofs/artist/74818c6c-a8de-42aa-b055-14297d8c2127.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 0xd4c65df00d3092b7b0edbcd5940732c1467ee93ca12133c2361f49f9d8e74e31. 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/CA5KR2137572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae59cb159f44254b0c35cb647c959c387c9e0e527057852e349fe817810c62e. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZTAW2273080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d1b306f89d7c08201c4ddfa1de6ba1d2ee66efb8e584139adc2a75dc1430b1. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZTAU2281411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347c791abd04d17fbb6bdb841581a8c34d60a1540b807b8de7300faffe622b72. 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/QZTAT2299664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2452e9a9f7511d5d8fd828e4aba9777a05a5b0ae4973018763b9fff3f40e2c. 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/QZTAW2273081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae01a53b396f0f0efea6bb0eb27be742f39e9698e059f2f442f3db96aca5e9c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZTAW2273082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f533d50e55b7eb2eeaf575d948cc8c461878994348e089bc1494ec1241ac0e7. 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/QZMEN2347174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae32ec69ce04a258f36937629018a4bd22f8849bd1b3181c91dcf31f86de13a. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:59:49Z), 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/QZTAS2315900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa392d0fe1a5736871535b147dd6381c8ac8ba477df8b9823d38068bec1df3f10. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:34:00Z), 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/QZK6P2439118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3523770134eeb1f21d9421149c13b0db9cfcb879ce966290de241149425bd0e. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZK6P2439120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b000a13516ab7b0ba5d833e1092c0ad5594c5a088a0c74284cfee0f676b3cb. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6P2439121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a36b2c5229a23b288f642a7598e949e46649a591eadff7976b8491322732e24. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZK6P2439122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b084ec3575f9cca1e34eaeab1b067edf51f6f206041776f90f4031e80023a7. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZK6P2439123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf122a9dae8cc8a17ec5be2cccab4014f4e94924676b4cabbcc95f7fd32adc68. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6P2439124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae32ec69ce04a258f36937629018a4bd22f8849bd1b3181c91dcf31f86de13a. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/QZTAS2315900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41395b43dfc2410c137e1fee9867e29e7a969a0959edecc63c79fc6dd21e498d. 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/US3DF2519937.