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 0xde2269e142eaee1ff0ca37be2d88aef6526fbeb68441454d8692b0228d5fadda. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b15ce326-dabf-4f9a-ae54-0c04827e5605.json and https://artists.proofprofile.net/proofs/artist/b15ce326-dabf-4f9a-ae54-0c04827e5605.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 0x92307f4751eda30f8b0627cde972819f3106f633522ef30e25ddd7deec3a5783. 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/QZZEB2457477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a140642e3f9b8bdbe2e6938b13ee1f1aa8f72406698b4586405e46627f2358. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZZEB2457320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474a24e585dce5e47a64679c0b9e274e557dc07427e6df6e443ecf02d9ccc5b2. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZZEB2457151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131372a882f2c336c9afe76faddf4928e1e48d438aa30c313af5ac6d2c188c36. 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/QZ5FN2511786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a656123e237b3273ee0bb0fac913a593277295fd966816594f591804750018f. 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/GBRKQ2571215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6e49907bb7ad5f287be2101db472d69c73e4f3374cdd7b9768c3cf113b5d3c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMEN2530386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f8757d3e43fc9f924af3eb35412374b22dbb0ab01c3ecd0c0100ee86eae8fd. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZMEQ2502434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde37e2ef224f566d1cd2864d99181f83fc3ed0b3c5ef149e53584814e6f95c5e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMEQ2502429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6229872ac4c609e6ae1f18af0b22cf0c347fe74d57ca280922310578c37656b7. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZMER2561368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7389c0514d16b60a611066e320a19fdac9b75b3533372b2dfb7d0efa50bf9b91. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZMER2561369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd66ac9dee88363e8bb8c838eabd3da27ff9969c0416b48968e78d062b6ee11. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZMER2561370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5735be439c39184c2b25c23efaa629cda6e4900c119f70f999d9edc9b17329fb. 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/QZNWT2567789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12dafb25e42c988c8cd4fcc0e41b6b65c6893fcee9e6c2a4074ea242a86116be. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNJV2544450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8717253bf7931d258831fe41eb6954501986b8ac3dc85f3431aa6aad548019e7. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZNJV2571571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91a6d9d5fb2d4e23785e3e1adc4c582e68205d7ba929be6d2d5c798c711d56e. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZNJV2588452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68c85454beed2c27d24da1a76926accec49aede657011f28404b7e38ed6b55b. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZNJV2588489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0f1bcb5227fd1565725e62aa7b98f4d9b65a49f36cc25ee369b93f30d43a85. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZTB52581111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6390368f90e4b508f08a052be8e00e1a6b88eb04c2e99b5a7015b9d547ce7549. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTB52518121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb442979b0e59d2d7b6055ebe1d70ec16a761bdd6c610b47bf3d77697a612ee. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QT3EZ2540226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83588063773690f45a04e8a51441f770f4fe202a4451731f07ee23d4bc2babad. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QT3EY2561756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981b897d385c719e0dc49b5418c670a99b65097ccd4f477f6c850fbc53cb4090. 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/QT3EY2564509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc4733ef96b82230433554e6296c58410fc95eee39927660b6633d8b062f66f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT3F42581562.