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 0x2e4e6b1e56fc603cc812d45b495036e276fdc783551ff33ba981d96098446296. 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/28fe280c-4192-4619-9bce-b49487fe8f8a.json and https://artists.proofprofile.net/proofs/artist/28fe280c-4192-4619-9bce-b49487fe8f8a.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 0x9ee0d134f4e55ea1c467faa0dbee1fe769c0059e84930eb99285208f355f6a69. 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/CZH442000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ceb42151994d697c6f9972f5ba53735936abc4975c4477a298b99699a14f45. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/CZH442000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778cfb804eb3c8ab7b87947ba71fdbaa388c42a43a7836505d3b566490bad7ee. 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/CZH442000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93da03ae203ce464b71fc5a15504b788b711aa9af4bbbf4550a7455b7963c74d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/CZH442000032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cbf0c58685b07bc2b517a231f39cb4e967678d3672396dad04e4f22a074792. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/CZH442000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd5bee0c1dae4ff44b364af3e7d7595996e184e1cce6b95573df4fa60ce63d4. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/CZH442000046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bf803a3758260c0a8b24719937bd919094497cdf8cd060c45236aa5fbb0dbb. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/CZA421400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d706095f1a6471f16b2fda76957cb0c743b7c51bd71cc0e6644c8339e34169. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/CZA421400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e76ed2ca402aed8c8d3451881b25bea3baa47e61d754ceb6401559328a6e43. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CZA421400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7c86d6a57deee83b0939b295ebd1d6d8cc4e9f11dd04af8d4839b3448178e2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CZA421400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f73a2179c35b987a58acd53fe753df0f5e8a132666f472d2e905ab9f8cf85fd. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/CZA421400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3eb625dbe2e81b21a4e20172a519df4a0fed03b66c5a087cae88fa6b454967. 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/CZA421400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ddc8808d7a3d05ab32c1cb64a504aaf33b74b2dcaa24bcfd3b8619a040b0d0. 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/CZA421400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d81dce64969f499c0fe366c6aa819f93f652a61bf5703d6d642590b44d110a. 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/CZA421600018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdf57a893f59c34095bbfa74aa76164dd1ed00fdae61bfeb274fccb5f4c000b. 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/CZA421600026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f468fb4b54737c1d627150188e7f7a6b94c676037aa5500eb6c449605091e2. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/CZH442100226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4da8d2cf8662702c477196a1145bfe222941e72944f04b7c9b8b548275e7a5. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/CZH442100227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffe4ca7996f6917f9f72857282ba47930e217eebda3485667e7e8441b2fd273. 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/CZH442100231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ff20e6b5347cfc7bca126297a24368ff58d4893916af7fdc0a0c0044df48d1. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/CZH442100242.