Margit Carstensen (29 February 1940 – 1 June 2023) was a German theatre and film actress, best known outside Germany for roles in the works of film director Rainer Werner Fassbinder. She appeared in f
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 0xfb78c334a860bb525d80ff3c3d83afb58eb7cd515a368f598b57e93b937162a6. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/402a04cb-84c1-4d97-b064-dc72f8860663.json and https://artists.proofprofile.net/proofs/artist/402a04cb-84c1-4d97-b064-dc72f8860663.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.