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 0x200064e5a6d9f4700c3ba2b7543d06c949ea8ea79ff664bca9b3e2cd158216ad. 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/c1b70685-54ae-4b05-b9ac-0c18a06f8351.json and https://artists.proofprofile.net/proofs/artist/c1b70685-54ae-4b05-b9ac-0c18a06f8351.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 0x57fdcd95c35095758bc250717b0f92266feca694356a5bca7f68c8073a63af36. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/INV351200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d4683e188ed2d598b74ba8c4bb57b9aa14e4ba117f5560603749288850aee1. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/INV351200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d1909b20807905f0bfe1aa98282767e793634689454f0908d61e97bc9b3eee. 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/INV351200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45058ea02210a98e026b92718a33cb8523a4461fbc6fc8cf187bf2aacc7f345d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/INV351200054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf955470b0883dc0ea35b5fd5f8504ccf123a1fff847f35f97c98dab199d4f2f1. 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/INS181103744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1f5204b4df091b36ca5d8ecb2456f998d5e556cd4202ec9b91e4ce1d0e9fc0. 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/INS181103745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd02d09237db2db64dc4aa46c42607e0daf2518f03036b43c73b8319e54feed. 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/INS181103747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adff5b1b2ae7fbb35ef514f94fbe2b7565df93ab1ae78d636bdbb9b93e65038. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/INS181103749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccf7dbd03edc1d08af5bd72ddc24b27ce9edb1f342770a3e220535d42299a62. 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/INS181103751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfd85f98def555d39e44363211f5511d2c5c3ece9754c50c856d13d157fe806. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/INS181601838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a660a94bf178216272bac7d1e34c28c083b7812dac0c49fa1cb4e1e5f9520e. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/INS921801449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48df6764b8656e8f44bd62d0d44428c9dd0e4f8a874ce5676802d4ede03d091e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/INV351200106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886efaf7e7871e92ffd1a15e5ce3b564a998f01cbb77475826e56faaf198c289. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/INV351200108.