DEZ refers to: Deir ez-Zor Airport, airport code Deutsche Entomologische Zeitschrift, a peer-reviewed open access scientific journal diethylzinc, a reagent in chemistry
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 0x1edc9c77eadf042204977f68fa6a23acd9062f8a40f38a10cfa362f4c201a17f. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91fee92d-fa8a-4cc7-a55d-a71215769766.json and https://artists.proofprofile.net/proofs/artist/91fee92d-fa8a-4cc7-a55d-a71215769766.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 0xa907007f4a5d8573ed6121665a3eb4f8429ad594d0c5b49bc70856942f910fa7. 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/USUYG1395441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4159fb17a51513c6c4887f123454952cdfa3994ccf8f34b7e4699dcd9125e4c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USUYG1395442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b4bb74fad3690bdd152c2bac97d56c977296b1aa6c1462dd6dcf80b90e48678. 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/USUYG1395443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3f66801d66dc66015fe7d26289e6dd0678f14eb0b872057bebf5789fd8d00b. 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/USUYG1395444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d95e695a8266fcb5d48d8401b3c255e208e6a5c3d40d86ee26f1961c3dbd80f. 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/USUYG1395446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c90fd6a2ac6ba2b1ac9d13e67488b6869dd0fe2d17caa7049729947d8bc43d. 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/USUYG1395447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e53b79e3d52f9a75bbf711b355e695e928b3c11c85da5fafe4a4a2d9c467d9. 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/USUYG1395450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f8c22abd226b7bdcdd0a9caafb0560626de7f2ce5624612cbb3bcd647dc1b8. 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/QZDA41910567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde2ad9763714f3a9cb2bd4f55586c03d086413c839571d8982aa742671f69c5. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/QZNWU2233055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e450dcb215f7504e43e73c6682a4a60dc91dde15a8b970edf9dd485f21a3d30. 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/QZES92242222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27031132e8c703453e69d1cafbcc8e7a8c99e17585d2a06e2f536c9b40b9ea2. 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/QZNWQ2215301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5807f3437d21c1003dea43869e2e76e26af03899b932fd43af8b7efe1f0f2010. Chain 2 (Bitcoin): anchored in block 957227 (2026-07-08T21:49:37Z), 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/QZNWQ2215303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2ff5e26815933ce2ea5d81de53c0cb4ad0d43f18ed3960d13fbb8a290f8753. 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/QZNWQ2215304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa753659867a8bd243bf0a632b21a20a7ba73affb39fb449c283987a17debe12d. 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/QZHNC2298370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd436d61dff3fa032a2a8a6de88dfca19880b337ffb61635e2caa64fc68dd69ed. 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/QZHNC2298371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b220c0e6082eedf4dc6d18e1efdb1aff8879133171041d9d9fe50daad02682. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZHNC2298372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a2ea2edcad10e09be950ca384b0dda5614f3e2f675ab0dcd90576de4cd98beb. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZHNC2298373.