The term/code Z4 has several uses, including the following: Aviation Z-4, U.S. Army designation for Hybrid Air Vehicles HAV 304/Airlander 10 the IATA airline designator code for Zoom Airlines Au
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 0x4f380f9cae2cdf9f22d0a0a30634703c099505dd2f541c494e82f3316f5e8cb6. Chain 2 (Bitcoin): anchored in block 953982 (2026-06-16T17:42:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c776c45-4fa9-41b5-a248-19226b9808c0.json and https://artists.proofprofile.net/proofs/artist/2c776c45-4fa9-41b5-a248-19226b9808c0.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 0xdd258ea4e0b889299a64f3f7adde4da876116609e6c54ec513df8698d03bb4ce. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNWY2519920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8236d642f0812189254714d3b77f0693f1ca13cf2d659f7b0fecd550db6b4c7. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZNWY2519921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe526fb7c91f60690c28ba3fbfb6108baa8c888c84f7a23ef46ca9973793ddc11. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZNWY2519922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294c9e5267b2603a9c72afbabc52fee371d388dccf9876c8be9bb7da8e5d68c4. 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/QZNWY2519923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed976ee93d5ad5816a32aed08ba84f4f88f24ef74decd0965c6ca35249221bbc. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-17T04:32:01Z), 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/QZMEQ2597606.