gabriele marazzi - self-sovereign identity and blockchain: use case, advantages and legal issues -...

Gabriele Marazzi CEO & Co-foundergabriele@spidchain.com

www.spidchain.com

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

Gabriele Marazzi CEO & Co Foundergabriele@spidchain.com+39 389 11 11 239

www.spidchain.com

Thank You