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 0xb0c857cfd397f46850bcf59deb0a04f1b1cd7a6025b22852ddbfcf79d0197502. 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/6dd9f894-17c8-4449-91d1-92fb0bfea462.json and https://artists.proofprofile.net/proofs/artist/6dd9f894-17c8-4449-91d1-92fb0bfea462.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 0xcad72ad98a03113ac711102349a83ca1a56778adb5aaa8144942060b278da726. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCAEW2098375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6328c0af69a0971c26ab049f23bf43ff303d4361721355babe7fc7c8c9c9d614. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCAEW2098382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343c4e4bdab031ca327b111c1f0ac8af4cb8772e969173744cd7765126d8f170. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/TCAFA2084701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb992c65452d2dceb6fb38f564e5ff93170ef71b1e125c31c4caf58575568bc7. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/TCAEW2098231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf21aed6d1813eab2f7fdca8cbb7b6497816742151ad20aa16ca18f936c808e. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCAFI2139226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bad5446f0a0f41ccc3adb77460d88cfad99c7139ab486b769835c537fe56d9e. 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/TCAFE2013578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99ad6d7c260f933b69be49c5f29cf90e407705268e7d7ad09a733d06fb350e8. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/TCAFJ2153391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616016c6fc61006259a24b551ed20101030873204f743c6948512a1dc6f86e6c. 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/QZNWW2271959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfb850cd3cf7c7766cf7d5a1876d4e7031351c605b028278dfd969db768853f. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZK6P2371617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4bd6e25bf066a16d3c648dd0f5b12b41756d2a7687a170c78503f82533a701. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZHNB2425245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54dc600a1ea693c69e5ee83e959478d6cd89f5823fb4b33f1a51f570bc8e17e. 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/QZZ7P2420178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85871132d9bc7cb4b3dd96a11576f19c8869f32f80b8942a0f296aa20cb3d70. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFYZ2578060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367caa03de92ac72feb888ab951a10df75d5d10bdbc01d4d0e0cc44f71f76be0. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZHN62593064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e1248d2b97babdf29f8e5734b4e3e04a9840863bb3bea34f5b9ee286a2579b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZK6P2590745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f52ae14f325c94b5ef1e4c73cfe1aea6555561c9c49510f9460fd045c348dfb. 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/QZTB92591856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77065c775e49a3c1ab0eea80f0b8d76ab626a83b1cc0bbbff52df1aafa14340. 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/FRX202100264.