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Blockchain
● Bittorrent: information exchange● e-cash: who● Hashcash: what● Bitcoin: when
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Bitcoin first of all
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More value
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More secure
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90% if not bitcoin is a scam!
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Bitcoin? No … blockchain!
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Blockchain is not an innovation
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Papyrus chain
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Papyrus chain
1 2 3
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Decentralization
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Bitcoin innovations
● Permissionless
● Trustless
● Censorship resistant
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The Byzantine Generals Problem & the Proof of Work
Leslie Lamport
The Byzantine Generals Problem
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A: Attacco
R: Ritirata
Consent Nakamoto
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A: Attacco
R: Ritirata
Difficult to solve, easy to verify
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A: Attacco
R: Ritirata
Difficult to solve, easy to verify
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A: Attacco
R: Ritirata
Difficult to solve, easy to verify
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A: Attacco
R: Ritirata
Difficult to solve, easy to verify
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A: Attacco
R: Ritirata
Associate to each message a problem
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A: Attacco
R: Ritirata
A: AttackR: Retreat
Consensus among generals
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Other forms of consensus
● POW - Proof of Work
● POS - Proof of Stake
● POA - Proof of Authority
● Other
● Permissioned → Private (DLT)
● Permisionless → Public (Blockchain)
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blockchains & dlt
Bitcoin Ethereum Bitshares
NEM Hyperledger
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Blockchains VS Distributed Ledger Technology
VS
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Self-sovreign identity
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SPID: “Sistema Pubblico Identità Digitale”
● Single point of failure
● Lack of flexibility
● Privacy problem
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Self-sovereign identity
● Data are stored in personal a device
● User is the only owner of his personal
data
● Web of trust & privacy by design
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Advantages
● No single point of failure
● Privacy by design
● Trusted identity
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Web of trust
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Certificate on the blockchain
blockchain
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Certificate on the blockchain
blockchain
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Certificate on the blockchain
blockchain
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Marketplace
blockchain