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 0xa0ea7a9e9ed9517d3ccf58eee1a6f69b14a1afc452e7f22a27540c82ca099995. 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/2463fd94-ba04-46d6-aa81-0b1badc266e9.json and https://artists.proofprofile.net/proofs/artist/2463fd94-ba04-46d6-aa81-0b1badc266e9.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 0x7b32604234215bceabb33ac282258718e691b30e1b3d83f3c8853cf7728c1637. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6F2472226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd0a735311111cbb74e42dea7c5ded2232697533f416af45394d0ea752cec32. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/GBSMU8515704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81e72601a664cdd2fb38fd2c22b2d3e3747a07aa63c94bc58fdbdb8bcc823ef. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZK6P2015583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2edb71de3e4db4b91e48b713030581e46ed6039df6c78995b19cb8e5d28494. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6P2015584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7bdd2ce8801ce6997aba1e65f54345479fc0ea6a3066752e412531cf3654e1. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZK6P2015585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47e9f416965d325e55571e56ef20ffd0d20c4a208f586b817d3661ef0f4066f. 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/QZK6P2015586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa192e834e2e7b579dfc46c985a54b0a7992ec0161cfe637d7b04140243bba145. 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/QZK6P2015587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba141bde80f58bcac616859e63fe0f57036adac9049bef6c2f9aa1c20915162. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZK6P2015588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8cf87c6fa137068319f31e0de320f284430a577c174e6d6186360ea86cccf0b. 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/QZK6P2015589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ebdfb441b92eb47348dd94023e534e7f583b5b52a3e4a317b3be89b6684423. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZK6P2015590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6622c0c62793c4fd9781857b587ff3f99dd5f6e464afdf06ea332e3e15d3c24a. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZK6P2015591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0432caa84fca303728274f50cb8179e6e9e012cb804ebd574139ad89c65e6ae5. 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/QZK6P2015592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f425b30cc02e5ee59590689bbd127986fd31811e3b57c0592c066b52cae8ee. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZK6P2015593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17878c812714e2707905e8881e7eb2ab83d0e811cf00365892830c48e550a364. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZVEM1852647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed91bb1d0c063820d78ffa944ae03ab12c642483e7948b08bd2d7378a8fa16ed. 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/QZK6G2414901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c7c08b420ca4c842536d7a9285f97a2ad05bfa534b0e7088d05fc0c2c1830f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZPXF2120420.