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 0x949030263692c421b86cc87ebccc8190ee860f95813a9a8ad9ae8036133b1666. 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/ee0cfa4b-a295-4963-94d2-abc194f4fc37.json and https://artists.proofprofile.net/proofs/artist/ee0cfa4b-a295-4963-94d2-abc194f4fc37.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 0x3ddce4744eff8127647bdbb5efa920d10830621543155a861e3efa699d380a9c. 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/QZHN92161291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6c77e1d7871d765dbe1005974abf320e2e61d47f4cbd67af3d7d844e098b11. 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/QZK6K2186341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732860a78b869c35b1420178377db47ef8543aea5a9c0698a61ead1611924fd5. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZNWQ2179880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4735d7f9152ec9257b259fa8a2c91ba6e53390ce184bd521cf97c1bc1934843a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFYZ2271029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abaf44b7cba230ed8ce43ab8b62d4345c3a772c386dbdc47ab32f4ff9fea059. 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/QZFYZ2246551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619d15d1f664a4ffcaa149a251e6a7c55ea957e565621244be61a159219df1ea. 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/QM42K2274945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbdaf224f135bd1d2aae6bdc8c31dc8eb972ff5817c071a99f4d99ff1b6afa7. 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/GX5MY2223712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e815c4ac9d8fe44b5cad6c4599b136b6043f70fe0430d6027d0affef7e534be. 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/SE6SA2298946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87748ab2026a665ce75b7716f6cca2afe4654be69bac8ae54b95df0fd3a17c63. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GX89G2319494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc1095c7143894f1be403a9f2ea04db952b91f8343fbce00353788d75bb0920. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GX8LD2324649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfce63dbb650c99de4047cdac98b57a07da4a0b3d223fbe20a420a0239c8641. 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/GX3HH2362570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39353721f8809ea9cee96882182fe58abaa8d18a7b17af6dff7bd738a9b6a555. 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/GX8KD2494657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a6af333ca017b3029295db85a1f02275ac9f9e38cdc701709cae4a4ea3f70f. 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/GX8LD2450000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe382279c83e45d98e2aedfe877b2fde2cf5094aabf5db547e2945164b605fd66. 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/GX4R52457442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad368e54fc56354104153969a79acef42c3b37ee8853e5a76a76254c9ca47802. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/GX5MX2494647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe9487a198522dd04818b4bd966f49f19ecac790f743b95ae2ca07ad1c43bcd. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/GX38U2502227.