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 0x437d7f5c643e31d71c4f89061652e6e9c62b4c526c4b2f972f1860661f9a6838. Chain 2 (Bitcoin): anchored in block 954010 (2026-06-16T21:41:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34686561-2a66-473c-b829-9bdef1836570.json and https://artists.proofprofile.net/proofs/artist/34686561-2a66-473c-b829-9bdef1836570.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 0xa8903dd93b6dfe117c0170bbef89b3505a7af1c225d5d0f3747e2aef03b63092. 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/ES6642000102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd689d3a1434c5fded832d6e4d09267974fe2c0e49f09bce657ee615cb7b846. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ES6642100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b11bc65498e08846b2b343d78ac9b16bfad2decf694b7925ba38dda3a184c06. 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/ES6642100090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8903dd93b6dfe117c0170bbef89b3505a7af1c225d5d0f3747e2aef03b63092. 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/ES6642000102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf687b71c0d8ab399c5e1e6a374cd849dcb3106c2189576786004edf6052ff90a. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ES6642100087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8575f6ad49eb001c3bb916cb659ccac362942e173846259232f43657849d3ac0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ES6642100088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a648fb872a7be51c478d39d4b36efae77ff2e9fab3076da1e928324fda1a3c6. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/ES6642100089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b11bc65498e08846b2b343d78ac9b16bfad2decf694b7925ba38dda3a184c06. 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/ES6642100090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a80054137b48336ab6def38a73cf7ccacb75ce185b517a3b28ef7939443730. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ES6642100091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca39650d1967d1232e1b1f5615b7b4ae5ef404dc463db3793100ad151b036373. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ES6642100092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf630b49e802ba7a6ac1e35b409517106a838382c5da08108054d3f1358d8e5a1. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/ES6642100093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5b6f73c3c5f5029df66e4789dde46efc9183af24137cd910adf3a5862ff345. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ES6642100094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45361c934ad50c3abe44e3aef6009e0e60f409a8c6887d25e4a3189a37bebd7. 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/ES6642100095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d9f25a1f0cddd66c8e72736e27a0493ee3e2567cd0478e5f1cac94698fde77. 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/ES6642100096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ac35010d223c039ba4a54db92f5239a46252cd1067627cfbc8d8b50452d1e4. 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/ES6642100097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3a2fa792988b81609a83534742c8e73431a256adecedbd8909390cd2cf3284. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/ES6642200070.