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 0x249f540605f36db4ea73c9468d514ba587336935b643ca74f47e40649a2dda90. 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/7857e268-9c7c-4b2d-be39-2cf14fd056b1.json and https://artists.proofprofile.net/proofs/artist/7857e268-9c7c-4b2d-be39-2cf14fd056b1.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 0x8465e433deb7b24b2b99fcbf0b5e72c8e98c93416586cff03be3d2cdee18e425. 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/US7NS1900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afcb53e7ea64083d5ae55f9ca69fc4fbb1b7d38cc51f4e386aec09619953f45. 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/US7NS1900031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7dc5ca2214cc382204d7538067cbb472bbd69d02330893c8c00a9775c88e2c. 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/ITS251900130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287ee5325f7317db21bdfdbc576453dc49672892f27ad31c75c2c8f61e7ded58. 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/US7NS1900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca02ec8bc3764067e750a1f7947195c5b20f480ccfc98efb98aa610eeb7ece5. 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/GBKQU1957450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b8ab80b331ed708638dec9061ee31e928e378658840b92a6da01e05d06a2db. 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/GBKQU1957451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6387668bd7454744bf665d5afadf6c609f27ef24aa443131a42716bf21bd072. 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/ITS251900042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4ced17b24fb15c15a0322731b61c3d0b4957f5ec1edebf64a4a795a5598dc6. 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/ITS251900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692ce9b33b21a8d1f7d32981937c93aef0c66584e9a89dafa9d82e6446b804c7. 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/ITS251900040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4305d4d2b509dfd4d0aa6578505db0bdbc672489d745d282273a137f65cd03d. 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/DEBG51800037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62df6254a5d3d8411a58ef695e13c6cd645d6c6ea7ef4604e1a304a6fed40e4f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:27:30Z), 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/ITS251800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0752d4e11b058315417208389b52933d17cb98e209aa561efe993acda51ee2c. 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/US7NS1800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2816e9fe34d00da4718c95a34bbb7b27740cee745451dd000fad3228d364e100. 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/US7NS1800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb575aea731dd63c7c29fffaedfda84668293d89876602edc0aa9b11a6f77293f. 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/UKACT1891525.