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