All aboard the blockchain!
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Transcript of All aboard the blockchain!
All aboard the blockchain!
whoami: Przemek Nowakowski @ TSHemail: [email protected]: https://github.com/lapisangularis
the history
“The first blockchain was conceptualised by a person (or group of people) known as
Satoshi Nakamoto in 2008. It was implemented the following year by Nakamoto as a core
component of the cryptocurrency bitcoin, where it serves as the public ledger for all
transactions on the network. Through the use of a blockchain, bitcoin became the first
digital currency to solve the double spending problem without requiring a trusted
authority and has been the inspiration for many additional applications.”
blockchain definition
“A blockchain is a ledger of facts, replicated across several computers assembled in a
peer-to-peer network. Facts can be anything from monetary transactions to content
signature. Members of the network are anonymous individuals called nodes. All
communication inside the network takes advantage of cryptography to securely identify
the sender and the receiver. When a node wants to add a fact to the ledger, a consensus
forms in the network to determine where this fact should appear in the ledger; this
consensus is called a block.”
in nutshell
- distributed database- contains history of facts
- splitted into blocks- secured with cryptography- using consensus algorithms to provide integrity across nodes
consensus algorithms
- proof of work (PoW)
- proof of stake (PoS)
- delegated proof of stake (DPoS)
- proof of importance (PoI)
- proof of: weigth, bandwidth, space, authority, type something and i’m sure it exists…
- byzantine fault tolerance (BFT)
- raft
- paxos
- directed acyclic graphs (DAGs)
blocks
- previous block hash
- facts/transactions
- merkle root hash (in case of transactions - cryptocurrencies)
- difficulty adjustment bits
- nonce
proof of work - first encounter
- nodes can receive facts in different abbreviations- nodes can receive invalid, fake, or duplicated facts- nodes can spam the network with transactions- without consensus system is open for DoS and Sybil attacks
proof of work - diving deeper
- SHA256 hash contains facts/transactions, previous block hash and nonce
- nonce as only mutable data in block in order to calculate hash without loses
- winning combination should output hash with proper n of zeros in the beginning
cryptocurrency jump off
- adjustable block mining difficulty- facts as transactions- predefined currency amount in system- rewards for miners- fees for transaction senders
use cases
- digital banking- digital identity- decentralized apps- internet of things- voting systems- decentralized object storage
steemit
Steemit is a social media platform where everyone gets paid for creating and curating content. It leverages a robust digital points system (Steem) for digital rewards.
hyperledger & ethereum
- hyperledger fabric
- hyperledger iroha
- hyperledger sawtooth
- ethereum platform
- IBM blockchain
what is it?
- blockchain structure based on naivechain
- http api and p2p websocket connection between nodes
- no cryptocurrency
- asset storage and selection with help of consensus
- written in node.js
- very dirty and ugly code… but working!