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 0xaf01113569b8905bce8983084db4e2b6126168bb03f5d5abb2ba4ecbfaa646e4. 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/c1c5742e-ad72-4276-81dd-7eb172dd0e78.json and https://artists.proofprofile.net/proofs/artist/c1c5742e-ad72-4276-81dd-7eb172dd0e78.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 0x2473499fa284d6b839a55b5a3d1675ab2fe5b49552cc5e2977f4cb3891b387ef. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/PLC062382514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7cdb15816ad5480fca686e9fa6c05469c92b62b8eb6f856ad7e257e685066dd. 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/PLC062384554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52862086a0899ee1c5bc45744f1a399e0b5d01790f74c7be182efb8da534458. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/PLC062384558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2695f4712a594261f75f43588b71be65819abf87774e1bb34cfe717fef165134. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/PLC062384560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb91db1e9186a3a60674a4f77c0ad5c311173a4899184ebac2ed9bfc1d7f752. 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/PLC062384562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7b22a57d056ae8065e5628e4ce997bb4681ecf167b48f8aa1cd631c71b1462. 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/PLC062383046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcd948b1373eb6ace96af7318c7ee6f9c3e1e51a0cf2dfc60820a27811b7c26. 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/PLC062383050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e23ec4f9e25022f3c2eac28f81eb52cb8daa452090b5bce861b8faa8d056a7. 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/PLC062383051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b1376f2de8e9bfd01340ab5bfa5311def66d2cf2dda60014501fd13d38ea6b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/PLC062383053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a7c22faf03497fdf326e00da19fbce08687204113b4a26f69411bca0576c0f. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/PLC062383057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53446dfad07565ed3e7872acc8d76c8d4cc3ffab813a442a0f52b4ce20e372ed. 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/PLC062383058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d205acabf90a62c0f1b2182a33b0a98e81354eb5169bae0f8f3c4a4c14af33. 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/PLC062383048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e99928ba2c52458d66d1e6c33a27d7ed60b1df951a8b7281dd6a2861e0f3829. 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/PLF242211701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1a3ada7a7ea65bc4231c5a083becfbb78d301abcf153973ca4c0c8a521dd4c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLF242211702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d46f68f209a325a3e1040584f4a697203b4d423a5282933158b1003629cc0a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLF242211703.