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 0x44d01258ca3f221d2675e4821c94b17fa4eda1655484924484a9e3ec2738a4d6. 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/9a180492-cfcf-4032-8db8-f2b3b786879d.json and https://artists.proofprofile.net/proofs/artist/9a180492-cfcf-4032-8db8-f2b3b786879d.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 0x5681130daf1c092acc870cb4d2e2dea0dc5b83f488cadcffeb618aced9d9342c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZTAU2471806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74f75e34a8448c9f45d9b955ce89698130fd80fd171216777d8645ab1d8ed44. 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/QZTAU2469487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fd85eff7ac97153c23603bdfbd5f312875421e355ba3d3b4e4787cd9b0be24. 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/TCAIA2402371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a48255646306e1b62fa77363bf6cd537201184f0616f8e40c9c2e6750a4089. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:19:45Z), 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/QZTB82326818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24469e82357827d2f2a26022620df7fea80499d1a8e42d9fc24916188d4a219. 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/INT202303752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3c64e79289f47709b32ef1c8f2a2ff78e057dc951ee9219d8d203f97812b7f. 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/QZES72331360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345e11031ba0730fb8c1096c429d5d5a753452946f32a5f7eed5dbd5314b404d. 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/QZDA62393542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7961272ec7f5879510fab3a69c249fd3ba58eadd1879096548c194ac7f1b9fa. 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/QZNWX2271206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd1d7f51bf6ee0a436239a9391a2fa7cf9f00b534edee78b6ee01083ce2958d. 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/QZHNA2279529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57196c52474caba07cd0538cf4449d5c915aead6ada289d104ff0fa55b7e1e88. 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/QZFYZ2212051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28d34f634acb8ea6a8b38fccec8677d108c0bf975b9801c20ca716ba36cc779. 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/QZMEN2122375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa331a4f8ffbdb8c85500be7664a0d2040178da11d4156142bdbc4f98991d5350. 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/QZK6F2113373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21bc208329ee806c74706f8fb0fec7449c9c267a3d2824e0422e9fc500571260. 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/QZHN72187537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04a31ce939fea680b842fae53455891eb98b5c0b4866607b13dd44eab2427a4. 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/QZFZ42128579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc317dfc71dc0953d70c84569d9052f9a4e5ce471d9d9c1616bef7ef36b2f88. 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/QZFYX2196123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0294b23dd169293082dfafbb309f10e7e017a2c69031722c12619ea9de8fbb55. 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/QZFYW2112903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbf4c523ee1d753bbe301791038ca1b13a7d57573992d04f6f26e970afa69a0. 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/QZFYX2194570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc686ff7550f2288b2995e0f851accdad060d60183c6157b6d39fcc0bf9b5cc53. 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/QZFYW2114077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fdac3ec536cb60ab36590060ec8db053ac5e68d350c13a91148fefab3f09b72. 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/QZMEP2010687.