Bruno Apitz (28 April 1900 – 7 April 1979) was a German writer and a survivor of the Buchenwald concentration camp. Life and career Apitz was born in Leipzig, as the twelfth child of a washerwoman. H
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 0x900ee9707813ebf89aca439bede1013b19d74824544a08cca49cfc60cda1bc7f. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d079e40f-ae2d-4881-a9aa-b789a5691e1a.json and https://artists.proofprofile.net/proofs/artist/d079e40f-ae2d-4881-a9aa-b789a5691e1a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).