Crypto Wallets: A Technical Perspective (Nakov at OpenFest 2018)

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Crypto-Wallets:
A Technical Perspective
Wallets, Keystores, HD Wallets,
Technical Standards (BIP39, BIP32,
BIP44), Mnemoni...

2
 Software engineer, trainer, entrepreneur,
PhD, author of 13 books, blockchain expert
 3 successful tech educational i...

3
 Technical advisor @ LockChain / LockTrip: https://locktrip.com
 Raised ~ 10.000 ETH in token sale (Sep-Nov 2017)
 Cu...

4
Book "Practical Cryptography for Developers"
GitHub:
https://github.com
/nakov/practical-
cryptography-for-
developers-b...

Table of Contents
5
1. Public Blockchains: Nano Introduction
2. Blockchain Wallets: Types, Functions, Concepts
3. Practice...

6
Public Blockchains: Nano Introduction
Distributed ledger
Peer-to-Peer
network
Nodes hold
ledger of facts +
history of up...

7
Blockchain == Chain of Data Blocks
Demo: https://etherscan.io
timestamp block_hash
all_transactions_hash
transaction #1 ...

8
 Crypto wallet == software that stores private keys along with their
respective blockchain addresses
 Enables users to...

9
 Mobile wallet (mobile app)
 Desktop wallet (desktop app)
 Web-based wallet (web site)
 Hardware-based wallet
(USB s...

Practice
Play with Jaxx Wallet and Ethereum

11
Install the Jaxx Wallet
https://jaxx.io
Jaxx Wallet
Desktop / Mobile

12
Enable the Ethereum Testnet (ETHt)

http://sli.do
#nakov
13
Share Your Wallet Address to Get ETHt

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Send ETHt to the People Around You

Request test ethers (ETHt) from the Faucets
 http://tiny.cc/ropsten-faucet
 https://faucet.metamask.io
 https://faucet....

16
 Simple keystores
 Example: myetherwallet.com
 Keep a simple ECC private key, password protected
 Similar to OpenSS...

17
Simple Keystores: Encrypted Private Keys
myetherwallet.com

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JSON / UTC Keystore File – Example
{ "version": 3, "id": "…", "address": "2a90ef17a50f7e99387…c07fc",
"crypto": {
"ciph...

https://github.com/ethers-io/ethers.js
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Creating a Simple Keystore in JavaScript
npm install --save ethers
let ethers = ...

20
Simple Keystore from Private Key in JS
let ethers = require('ethers');
let privKey =
"0x0e210eff4fc77ff086d81d646c94af4...

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Mnemonics and HD Wallets (BIP39, BIP44)
 HD wallets keep a securely generated random seed
 And use a hierarchical det...

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 BIP-39 – Mnemonic Code for Generating Deterministic Keys
 BIP-32 – Hierarchical Deterministic Wallets (for Bitcoin)
...

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HD Wallets in JavaScript: From Mnemonics
let ethers = require('ethers');
let mnemonic = "summer silent settle explain c...

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HD Wallets in JavaScript: New HD Wallet
let ethers = require('ethers');
let rnd256Bits = ethers.utils.randomBytes(256 /...

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Crypto-Wallets: A Technical Perspective
https://softuni.org

License
 This course (slides, examples, demos, videos, homework, etc.)
is licensed under the "Creative Commons Attributio...

Trainings @ Software University (SoftUni)
 Software University – High-Quality Education,
Profession and Job for Software ...

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