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 0xf89b622000e4f34f1424f3bc37e1454036d45e6d076164017da312bc2d9062f9. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1b7a4f27-8d27-4209-ad5a-bd541f51871d.json and https://artists.proofprofile.net/proofs/artist/1b7a4f27-8d27-4209-ad5a-bd541f51871d.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 0x740c86cd33d938a770304474ace3a50cad92f425a95d39d9bddb577be4aba8a8. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZNWX2099247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4c03705cea7fa1c3ca28e509671f606955e3c2ce14f84ddd3f458f3f7dff95. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZPLR2011942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87823df328e8e0c758cbfec3e8e5670cd4ee180f5f41c6c41d401aef1a16d36. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZK6F2150307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb5ff67092e21525028f4346dd6df689062230af16b98c432b1b1ae262a764a. 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/QZES82288864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18823e9d8c461e0f534cda3b6b5508cd2413d25e2cdbce4b24f3a600589fc949. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZES92217938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c6268cea98836a481ecb206ab70d26dda6f649ade4dd81e131c62c38350807. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZTB62261099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e658b0643d796be4f0b68714be3b8b833b3f663af0a7249c5d9a6cafe2bf86. 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/QZFZ22312324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c6268cea98836a481ecb206ab70d26dda6f649ade4dd81e131c62c38350807. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZTB62261099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e29b368e0886deecd87734882b0d21757d139ccecfdf48fcd3647d15c146f26. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QT3EX2455207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b64aab30db2c44ff00cd4fe0b88610a1c2edf1b5458621195ab667cf906106. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZK6M2516669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a25d7ee2671ef4e06b3b26d51aad677274dac9133862477cb70e684be9878f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWS2511657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cbde69f9474a43316125068e403b96ee9065b2caff340ae6b17b116c6ef6b2c. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZTBD2502954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e58be4eceda948308753685e7df6495f935283c1a99d18608bc78c6930295c. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZTBD2502955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3fac4e799d91cf4697a450897cdb4ff8504677848a386924e51ab05a9107247. 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/QZTBD2502957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec3bda351c9bdf4d9bc9f3ebb01a4ddc9d89e70c46c4d6761279f83a27e9edc. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZTB42584617.