Michael Søren Madsen (September 25, 1957 – July 3, 2025) was an American actor. He was widely known for starring in Quentin Tarantino's films such as Reservoir Dogs (1992), Kill Bill: Volume 2 (2004),
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 0x5b0c6eb0a913e00316b3e2d6714f5e4f6370f103c68f786db7c91dcd8ca5a8f4. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fbd9fba3-e0e6-487e-be6e-5d60b2b33590.json and https://artists.proofprofile.net/proofs/artist/fbd9fba3-e0e6-487e-be6e-5d60b2b33590.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).