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 0x2b24f536fc6996ccb9f92277bf5491863cced029c2754f04d2e1b792c575f3ef. 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/ed29d1e3-22f1-428d-889c-fa0752c67a29.json and https://artists.proofprofile.net/proofs/artist/ed29d1e3-22f1-428d-889c-fa0752c67a29.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 0xe5a1f30b302cafcb951c9b29665caf42a984fbecd73439695ed7f5ae7f8431be. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:07:32Z), 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/ARF108600314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9068c4732de606033010c9824e132603cbed391bf995d6056d7bebf54cb165. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/ARF108600317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76785f9c989dd6a26f907331c4682312480b2e9bd52095d7672981268d64fe8. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:48:01Z), 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/ARF108600318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44501cc7392626938598f2ac9eb2f0810eecf6491937879acfae4b4d0bd2780. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/ARF108600321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138bf4828a12efba1615306ab3f06d8eea471277fd74fdc949da7a6e96a1c81e. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/ARF108700227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bd74c5857140509885f946cc1071d3f611dafd85b431893f06543329c477ca. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/ARF108700229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa217b5b0a85018666c81c009b826020e6d6cf7f3e7dedb315db2701dfbf7719b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:37:29Z), 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/ARF109000157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5dc06b5cc3be170d66bb38290579707cb316067bc9aaebef22280e045dd725. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/AR8L71400555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8faead81240e9894ff397e40512508df25b22fe26b40832f0def2e23ef35aa. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:54:17Z), 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/AR8L71301418.