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 0x872969b2b4326829657eb8afd5e8e550246536c74ad8b8f4fdddbd665c478e8e. 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/f63f0b51-d854-4434-a7bc-ea3dafeb2297.json and https://artists.proofprofile.net/proofs/artist/f63f0b51-d854-4434-a7bc-ea3dafeb2297.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 0xe18eb65e86fbd6e4242559cf06719b1131a2264c54d5ef3b4b8d5db650a97ba1. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZFZ71966632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da97bde77acdd0fa2c5e5d35dc72521cf616c86a684af51bfc2ce577220c04a. 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/QZFZ71966634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8186443973ed548a4f79f3b2fc3eaf74fa13d3cdc6b7019d8ee75cc679bb0047. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZFZ71966635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044908943cae365be76e8fd56a0f3fb54b0fe8b28d81dd9d655f6c4a02c03e58. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZFZ71966636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df48bdf78c0bc0c7fcdc98c1dbd65158722cfa2caa9e37ab056a20182b9e5a7. 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/QZFZ71966638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0494719a170d84aad0ea2264704e30c25f2674db03b946eb167181899777bb. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZDA52032440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5dc998824d7e27ea03ffc6e6c6c9366d390f391de6c7827ead1ccd388c8674a. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZDA52032442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602ca7d4c363f1e7929887e9bc7f7dfafb7ff9c94c4fe5354e6e02c259d518c4. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZDA52032443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cafb3fae7117841463e918306a11bd45032f347006be2e2ca9d79074e530c9d. 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/QZDA52032444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd351470924bed0e1632d5d5be5c3a3493a37de0e629fa1799c0c17de6557bd35. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZDA52032445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa272e8db64790c38e2302d39408f608f7af7a4a2f84d31a3d0f6b53649dd5852. 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/QZDA52032447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3bc09bc7dd0da0ce3d055f2372e393721e96c2dd043ce16c6b1456c41376b5. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZDA52032448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae16a31d443bb57f8749f6d370b905dbf364787a39e24b16922b37c314f678c. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZDA52032449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09fcc4c7034222a851bbbd1cce4024c459ce4c77f1735ba79178d5b4629317c7. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZZ7W2489521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a341085bd8ac02431db9d690e03a0ddef73d6e32893625386ddf7eb3ff446e. 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/QZZ7W2489522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55244b78cef5143ece93460ff8147ae047e3c4633c8556fed0254832823c144. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZWFR2414463.