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 0xe1ba9791600978c456533d489459447042f2298c20cde1cb8adcc459d902f1f5. 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/256a5af6-1280-4e47-80b6-999c824e7764.json and https://artists.proofprofile.net/proofs/artist/256a5af6-1280-4e47-80b6-999c824e7764.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 0xcb6b27d9562853781ec2e83e1c285f12573ec382f6066757bed574bdd8136923. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZHNC2321328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5eff75bb24fff08d8202833dc2568fba020d0931b74bd90359a8ce3722e2ad. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZK6H2302481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d78ca23381e6e6258839d17561fb9f9d8d1e6e8e1bd5a289599666897b511b. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZMER2392092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x281e69ab62f8a91419aa29170f602d12963e185f3fb9f617bb3022f120525552. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNWT2309519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98aadcb6f240a462b974ecbde8323d9ac80c23862d372a49cb710759ba8ed3bc. 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/QZNWV2342307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77906e8d2ffc2683497cd77d1cbce36845983a403085f47996f3dc8a42b72376. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZNWZ2312622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb318fe821e86eb241ab0fc78d306a6873e522e315fdf7c172fd7ce0afd55d789. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZTAW2374447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb992cffab941ba3eded1109abb8d2409da1267e866eed1235d00e9ca634538cf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTB42312933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13559acd13d34d8fe06d9a6eddd7efca18693005118f83851d880a4187744386. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM4TX2495790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2468f88ccce8e66c63f345ad696946d90714b359eb069eb82e28cd09d9810efa. 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/QZZ4J2401187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaca9a31b95775883275d499ce8b1852ab6cc31c4444fcd919e0408be7168e1d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QMBZ92412779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f7bb58a4b9ef08e6d090bd81e75e2e092121f5fc4d31d2bb4aaf1765cd608a. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QMDA62484275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b805792483331a8e5cdcc4a2fa0320b79bc6926c7434047caaadf291e444982. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QMDA72404983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11163f47fceae27db46b220d198a35885f14997a435badc6695f5d4e66e6253. 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/QZZ7V2458736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261ec4b310c456bf15bbd1ae57400d1931b6cff3a841df916b3ac45f35e358b6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ7V2458737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56625c5dbf0e42efacc88e265a0066e11c3c556ac9c0281f5abf31c61efc017c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZZ7V2458738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0838a962f449738f584ef9f88d7ba129e16b8363034f5505e9cafe0e22e846. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZGLM2515134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c5115ec02338fb5c46bf1b076b43f82328f7ce3c7afcbbf9979a0602fd9b58. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/QZGLM2515135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0a66e94410e61c81e370e25ece724820eb79fc99d80ffc0c0137d3f3fe4da5. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZGLM2515137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde7fcb34214a3b7690850ac7550c4026e204c482c9bb9cd4dbe873e0f3bee37. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZGLM2515138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79e95c7e6dbd1b558c48f7cd87f33d29be7f59cc69e8f31448c09caca1a8322. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZGLM2515139.