Blockchain

Workshop

David Stancel

Vznik elektronických mien Bitcoinu a Blockchainu
Princípy fungovania blockchain technológií
Blockchain a jeho využitie
Trendy, projekty, vízie a výzvy

Obsah

- VP @ Blockchain Slovakia
/education & awareness, lectures & seminars

- MSc. @ University of Nicosia, Cyprus
- Bc. @ Masaryk University, Brno
- External consultant @ STU, Slovakia
/research

- Consulting & Advisory
- Blockchain startups & Fintech

- CFI @ MF

- exPwC IT Audit

- New Bits on the Block: http://bit.ly/2C9u33G

About me

- 70's 20. storočia --> asymetrická kryptografia

- David Chaum --> DigiCash & Cypherpunks

- Nick Szabo --> Bit Gold & Smart Contracts

- Satoshi Nakamoto & Bitcoin

Vznik elektronických mien

David Chaum's DigiCash

a teda aj blockchain

... má svoje korene v rôznych myšlienkových smeroch:

teória hier, kryptografia, hackerská kultúra, open source hnutie, a libertarianizmus...

ako riešenie na jeden partikulárny problém

Bitcoin

What is Blockchain?

A tamper-proof, shared digital append-only ledger that records transactions grouped into blocks in a decentralized peer-to-peer network. The permanent recording of transactions in the Blockchain stores permanently the history of asset exchanges that take place between the peers.

Updating the ledger (usually) requires solving Byzantine Agreements (hash) with economically incentivized participation, secured by cryptography

Blockchain I.

Blockchain II.

1. Nová tranzakcia je odoslaná do siete

2. Každý uzol v sieti zbiera tranzakcie do bloku

3. Pri každom kole /bloku/ náhodne vybraný uzol získa právo určiť "pravdu"

4. Ďalšie uzle v sieti akceptujú blok iba za definovaných podmienok (ak má validné podpisy a tranzakcie)

5. Akceptáciu bloku vyjadrujú zahrnutím jeho hashu do svojich ďalších blokov

Blockchain III.

https://js.bcc.gmbh/

Blockchain IV.

Blockchain V.

Blockchain VI.

Simulácia blockchainu:

1. https://anders.com/blockchain/public-private-keys/keys.html

2. https://anders.com/blockchain/hash.html

Scalability

Interoperability

Smart Contracts

Cutting edge, untested
10 x more buggy code
Different logic than SW on centralized machines
Potentially unchangeable
Different platforms, limited interoperability
Ethereum seems to be so far the winner

Blockchain a jeho využitie

Blockchain Heuristics

In fact, of the 231 PoCs Gartner reported on, only 14 have moved into a limited scale live-in production environment, reflecting the immaturity of the market we’re seeing today.

The same report estimates only 10% of these projects will make it to a fully-scaled business model by 2020. Given this predicament, it’s no surprise seeing enterprises employing stricter vetting processes and restricting spending on DLT projects overall.

https://www.gartner.com/doc/3869368/blockchain-trials-industries-market-transition

Insurance

https://etherisc.com/

https://www2.deloitte.com/content/dam/Deloitte/global/Documents/grid/trade-finance-placemat.pdf

Trade Finance

https://block.co/

Ease of Publication & Distribution Independent validation
Immutable Records - Digital fingerprints (hashes) of the individual certificates issued, are placed permanently in a blockchain transaction
Reduced time to issue Certificates
Costs of re-issuing certificates in the case the hard copy is lost are minimal
Ease and instant authentication by interested parties (e.g. employers) even if the application used or the institution’s website no longer exists. Operational costs minimized

Academic Certificates

https://www.youtube.com/watch?v=tdhpYQCWnCw

Digitize Supply Chain Process
Track the paper trails of shipping containers
Reduce time spent in transit and shipping process
Enhance transparency and security of product information exchanged between parties
Reduce costs and complexity Improve stock management
Reduce fraud and errors on the quality of products

Supply Chain

Reduce voter fraud, inefficiencies with verifiable audit trails
Minimize government fraud, digitize most processes
Increase accountability and compliance for government officials
Identity validation; integrity of citizen registry data

Government & Voting

Ethereum Enterprise Alliance

In March 2017 a group of 30 enterprises announced formation of Ethereum Enterprise Alliance, which has recently grown to more than 200 members, making it probably the largest blockchain consortium today.

EEA’s focus in bringing Ethereum to the enterprise environment, meaning moving from a public, permissionless to a private, permissioned setting, which means it will be easier to provide better support for privacy and performance. There are some plans to support anchoring on the public Ethereum network as a way to securely timestamp the chain state.