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 0x89d072450e75775b76cc8162307a3583cd2ef7c71b02fe3db8f0391cd9c7b98a. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b131180d-aad5-40cb-8d48-2932bb80c646.json and https://artists.proofprofile.net/proofs/artist/b131180d-aad5-40cb-8d48-2932bb80c646.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 0xd0646369200736ce22b7ae75fb2073493721dd4266913c15276d57bc38780448. 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/QZHZ62173174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a25f7749278654072f7d5aad3e50275be50246ac352533c80ebaac410ca41fb. 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/QZHZ62173176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942e6766727a5d4f565c18f6e4e216920c9c49c5dd4816d98ef79be3571d0e82. 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/QZHZ62173177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19396bb6679303f823ded472394cf2672560db4ff9aac80f53b2f383405aa8a0. 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/QZHZ62173179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47cbd1c4c4db6c251e67caaaf4727d1ac229c1f4ae2cdc37529bf4e19c5f9342. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZHZ62173180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7552b4827cfbb32a7df829316328889b4a523985559df68b52ac055f166ad330. 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/QZHZ62173181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9eb3f24a84d89ef579452183e5dd0112497e56ae31098c1667a72c4b405eefc. 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/QZHZ62173182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f28b81200c63ac6c3976a8b86903f1176d9dae068a2de0de3165e9972ee8cf. 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/QZHZ62173184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2084d205b6c274eba5559235b071abd90af30a0b060ad9bb9d846f9c98879051. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZHZ62173193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899845b7bd2b994a84d69d74f228f7b20ca2676f9292d5d9b40b75e6a49263ef. 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/QZHZ62173195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3299d6019471ef3a48e8b72794af0ba940b9b17b1e28a79fe43407230383b4a. 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/QZHZ62173196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e66bb56843ecc378d9df046eac419c874cd296fc2db679a519dfd0abdb5df3b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHZ62173197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fac08a23bee2a73823fa6077edb5bbcf9c5f481318c03b1cd5ffbe83ad04d37. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHZ62173198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7c8c14ae3d2c8ab769e87e0cb20159bd38a6bcf6b1ecbfa38911d6d18e3dc9. 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/QZHZ62173199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444c7b427badeba4386e67402535cd04970977ba220304d5af64c6c4d6ca63ac. 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/QZHZ62173200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c61e30830e89a20d56ec6ae44e7a2ba95420179445ea4dd3ba231edec8bc20. 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/QZHZ62173202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b66f92cc9bc81a4fd4158be43acaddc7a7a8b42fb5b37741990bbd5b99ba43b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZHZ62173204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88529bf18cd6a7e10fe67be71ef0c14790e1311af657f3953a4c74b00eba746f. 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/QZHZ62173205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b39acd1cf8da4e108a4433f076ec33893bcc61bb09f8db7ba551f5910e6cc9c. 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/QZHZ62173207.