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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f21a8459a4bb789842eb8e046759aa81ea97f0c37dd78fa14d4c8c83b064fc2. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c95743dd-f369-40bb-9f5d-2c2df8e8a403.json and https://artists.proofprofile.net/proofs/artist/c95743dd-f369-40bb-9f5d-2c2df8e8a403.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74bd79d1a72702e8cfaabde36f60c46b3f9af02b93b5516e95782155dd8b1571. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QMRSZ1600348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3061c02c5dfe8af44882ec18b1f3c328582bc6f71ba64f2a41a09c9983fa0f. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:35:52Z), 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/QMRSZ1600350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b2230c3a8858af09c175696d5e0caeb164adf46ba1c317432e605f81accf43. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMRSZ1600352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ade05260dd0f5a5f0dd4d28386285fedbb27e54e9b14d2f519596eec20b3311. 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/QMRSZ1600353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e823235d1a9d8dea25c465157882e354188786bbbcb48b255c30cb304076b11. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QMRSZ1702997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643e9e124618e41b289b126bb7d391bb56c1a064ec6a41beaf1f9309f7491a01. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QMRSZ1702996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d31e58665b682dcd0d27a9f9cefdbcf5af6c57fbf93b301791b400d57ad7cb1. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/TCAHA2397502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b09a551171eae63ed2418a2795fa19cd1598f344157905d663e134eddf1ef6d. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T08:35:50Z), 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/TCAHC2384318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b631086b6933d546c175256e5da21fc6de754ba8d2826b051733935421b3d5. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAID2438111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea94778183611df84db11cfb8eeb716cb553a61bf9d0623c830fc1371a957c2c. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAJX2555288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23f0a603cba5cab58e76d74b264939b27fee9ca5ef469733fc1ff3de052e3ee. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZES91955545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f65f15a3ec89c0892e362b07fd7c04cb0a2a8604c03a00cfc7acc5b25cb0bec. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QZPJ32153607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74960b9518e940fc0201db3fdbed2efbc19c922b13ecb539324c6e980acec820. 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/TCACJ1583811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71f75b10693df458b0c7949d526360f58479bb0ec183869662ca93b243b5c5d. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USE830904603.
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