created and stored in a virtual format ★ Not backed by Government (Ponzi scheme?) • No centralised authoritative ledger — Distributed Ledger/Blockchain ★ Everyone collaborates to everyone’s beneﬁt • Very nice properties ★ Transparency: all transactions are public ★ Anonymity: owners of accounts remain anonymous ★ Integrity: No one can tamper with the ledger without leaving evidence
that combines 40 years of academic research! ★ Distributed consensus protocols ★ Cryptographic hashing ★ Peer-to-peer anonymous digital signatures • But we can recombine these concepts in many other interesting ways with different constraints
way to store and share ﬁles ★ decentralized www • Catalan Referendum ★ Declared as illegal by Spanish Govt ✦ All websites carrying info blocked. ISPs raided. ★ Where to vote? ★ Information hosted on IPFS!
is Friday This Seminar is held in 1 Newnham Terrace Today is Thursday Alice This Seminar is held in Richard King room Today is Friday Bob This Seminar is held in Richard King room Today is Thursday Merge Bob