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fintech Intermediate 21 lessons

Crypto Wallets

Build secure crypto storage. Master key generation, seed phrases (BIP-39), and signing transactions for non-custodial wallets.

A wallet is the gateway to Web3. This course teaches the cryptography and engineering behind secure wallets. You will understand how Private Keys and Public Addresses are derived from Seed Phrases (BIP-39/BIP-44). Learn to sign transactions locally without exposing keys to the internet. We cover the difference between Hot (Software) and Cold (Hardware) wallets, and how to build a simple non-custodial wallet app using Ethers.js.

✅ 100% Free & Lifetime Access
⏱️ 5-Minute Lessons (Bite-sized learning)
🚀 21-Lesson Path (Independent modules)
📱 Mobile Friendly (Learn anywhere)
Web3 Sec
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Secure Enrollment via SSL

Complete Course Syllabus

  • 1
    Cryptography 101
    Public/Private key pairs and Elliptic Curves.
  • 2
    Seed Phrases
    How 12 words generate infinite keys (HD Wallets).
  • 3
    Transaction Signing
    Creating raw transactions and signing them digitally.
  • 4
    Key Storage
    Using Secure Enclave and Keychain safely.
  • 5
    Wallet Connect
    Connecting your wallet to dApps via QR codes.

Estimated completion time: 21 lessons • Self-paced learning • Lifetime access

Career Outlook

Estimated Salary
$120k - $170k

Career Paths

Wallet Engineer $130k-$180k
Web3 Security Eng $140k-$200k
Blockchain Mobile Dev $120k-$170k

What You Will Learn

Generate secure mnemonic seed phrases (BIP-39)
Derive private keys and addresses hierarchically (BIP-44)
Sign blockchain transactions offline/locally
Implement secure key storage on mobile/web
Integrate with hardware wallets (Ledger/Trezor)

Skills You Will Gain

Cryptography Key Management Ethers.js Blockchain Security Mobile Security

Who Is This For

Web3 Developers
Security Engineers
Mobile Devs

Prerequisites

Blockchain Basics
Coding

Crypto Wallets FAQs

Cold storage?

We explain the concepts of air-gapped security.

Lost keys?

We teach recovery mechanisms and social recovery.

Custodial?

We focus on Non-Custodial (user owns keys).

Math?

Libraries handle the heavy crypto math.

Need more info?
All Reork courses are 100% free, self-paced, and fully accessible on mobile devices. No prior experience is required. Read our full Platform FAQ.

Tech Stack & Tools

Ethers.js
BIP39 Tools
React Native
Web3Auth

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