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 0x37f9234d7fe9e9d4ed3b15592e32a52536ef141f104da8512f715a09fb37af8a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb5a1363-b8aa-420c-ba91-cbc6e21c531a.json and https://artists.proofprofile.net/proofs/artist/eb5a1363-b8aa-420c-ba91-cbc6e21c531a.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 0xb0afe1ec01b09159328b236d72e4da9c4cc595ab9e454abd6607b61b759af417. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732022673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5601cbf923890e4f45d056183929668e06f1ad39cb7828edb13bc6e775f32bd. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/HKG732022709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb17ea7380cde1f147ced6dfaddb8727e578e1dcc9967f5686bde52c4a0538d3. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HKG732023133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1b3894ab747dd0f93fb7b0bbced04c743fccc1c5477283e33e4699c0cb7df7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKG732027387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c271f9960f3c83bb4ab681289bd410d707eb417f01628cbf0f282a6a35608e0. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FRX872476776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e22b181a6c1ead785b99a63778cb129c529dd962147f474e8149ed3ce2e42b8. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/HKG732293657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce883c05edb427769ec2ce757fa432c210c3debaac828261eabee60189778098. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/HKG732246228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3ebc8164eff13fbf25e4ab1b5589777deb32de2a5f84ec95dd67f07a3f7964. Chain 2 (Bitcoin): anchored in block 957198 (2026-07-08T15:54:54Z), 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/HKG732146198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13b326d030a230ba4fca6d68ca472eaa96d30e7e59d316139fa4b8f91fa00f0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732136388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862ba5ee9168eb5551dc3dc7ec8abae3d73572611553ada72b5ecbfe2db6fed6. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/HKG732128178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fb11cd2c544311c56ef92cd65ca37534690f97db767e6da309dd419e0d3ce4. 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/HKG732120107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68087d1fad64b23e79795085203b5d5fad1af1fc73dc448cc3f2b4edfb282405. 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/HKG732120108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a05b019f12f7aa4bc072cba42f7d29555f5177a3fa81c58a21b6206271f9d9. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/HKG732030167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670b2498887d542829686759649cc426687074b30a9242c87236bc7702946ed3. 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/HKG732018172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5adf9320124558878706440eda6555221be87e67d4ef6a941a0fd26d7431c52. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/HKG731907109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c667454eab5fc3787e7833f8127673fa969d548c3e5bc243ca6df9bad0a345. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HKG731900639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b31dfe58eeff45775ce73924d221cd46cf97dcb893449d3bb5fd647f423d70. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/HKG731800588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d06d66ed2bfdcd29e10a6b329354eb354b9981374604e65c4f57a72808fffd. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HKG731800124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49447c7b849b9ddaba578324de5cf3c94e026f06cf520ad5d12591bb05941afc. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/HKG731800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa721d137404e859cca76b52a4a7512a4f0f8c8ab9a61706dd06d9aaf6946380. 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/HKG731800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac83a0ad99fded467aa180095a019b8efa0bfc53c0f66f45f67ba8a4b111f13. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKG731800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05ddc79430f0c1545e0c8266d9685bf4d2e70114a825bfe3328c9e3f4e4ea11. 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/HKG731900168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e0e5a5032cb76b5dcc0f1027d642c44d4494e740980b8c516d80a966f99861. 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/FR59R1835470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56800b939818c3dc5cd8519f95cab27bca419050badcf129dc10e90b4e7a397. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/FR2X41869386.