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 0x094ad0b6ed409dc1347e7ba50ccf856cd0d87b53797a085aa4ae9cb68061b317. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af0c6cb1-40bb-4caa-9d63-4758a839b262.json and https://artists.proofprofile.net/proofs/artist/af0c6cb1-40bb-4caa-9d63-4758a839b262.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 0xb437ee9f5837f0ff3dfcbfa2f3a2ce862094d007ea13b5b58e9cdf52d1fa9ba9. 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/QZTBF2349857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5f830c28b84544c8ba5b2fee673c9f9b3466375697012a72ffcc89e9a8852a. 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/SE6QE2415581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcf03eb12987ca28dad0822ba81848a313bac240fc0c1f96f3d7e1ee0ff993d. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/SE6I32483441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed1dfcc30ff7fdbf70bc63ade2c91a8424017b160d64c3f8d198e08b5d47d82. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/SE5752413887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016eba99da006e55e8f8df8e86825aafe66072ea6ff53d90e1127e2c53889155. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/SE6QE2446192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ba7bc2ef2b5d5931807eb1bf89ff123360d059d412a7e3b87d24863c5da3d2. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/SE6QE2447436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0662ce295818063f71044d39333a39c5b7618f0890342483c6e6c6e6161876f. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/SE6QE2448197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd84b112931d338e28944dfd9707a5d156ce18d8ce9e9b4318fc4e0cf99b256d. Chain 2 (Bitcoin): anchored in block 957554 (2026-07-11T10:39:45Z), 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/SE6SA2459177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d051693b4260cfb799e87979133af219bb130c5065755d1e4be38bfabd112ac. Chain 2 (Bitcoin): anchored in block 957608 (2026-07-11T21:00:50Z), 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/SE6SA2487853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75696e0a21a860e579cbc06e66d4248085e1d2ecc8fd2be7af5aecaafafa86b0. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/SE6XW2421769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976ed934e96591c4716bc07e840a7f999b3f7ad52cf1aebdf42031548410ef5c. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/SE6XW2425302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1c3f6d511bcbaaa472c3266895bcb9abc752790fdc49deb461805f9e8b5cff. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/SE6XW2429088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc61bb7d71d1e4505b89eb60a765844292f73b2d7a314e9af502119613cad9b. 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/SE6XY2524053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4d44cb4ec2ceafaa39854e2a97e8d606a36a0fe3c5f4b14f7873f497c6c2b6. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/SE6XY2589237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fa5cf1a9044dc251b4b32c6f6efacfe8c7461792c7daabeda661247e8d7528. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/SE6XX2531849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f93c55f78b24a99d57dd8d2fa93d1c510e16d8199981f37052ca2ab623dc796. 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/QZTBB2313712.