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Blockchain Full Course for Beginners (3 Hours) — Python Blockchain, Solidity, Foundry, ethers.js dApp – Source Code

First you build a blockchain in plain Python, covering hashing, chained blocks, proof of work, signatures, a toy coin, Merkle trees and consensus between nodes. Then the course moves to Solidity on a local anvil chain, testing contracts with Foundry and calling them from ethers.js. It finishes with a tip jar dApp, a voting exercise and security basics. No real funds are used at any point.

Duration
3:13:35
Tools
Python 3.14.7, ecdsa 0.19.2, Foundry 1.8.4 (forge, cast, anvil), solc 0.8.37, Node.js 20.19.2, ethers 6.17.0, VS Code 1.140

Watch the course

Chapters

  1. 0:00:0001. Welcome: the finished dApp and the plan
  2. 0:06:5002. Setting up Python, Foundry and Node
  3. 0:11:5003. What a blockchain is (and isn't)
  4. 0:17:4804. Hashing with SHA-256
  5. 0:28:2005. Blocks and chaining
  6. 0:35:3906. Tamper detection
  7. 0:43:3007. Proof of work and difficulty
  8. 0:53:3108. Keys and digital signatures
  9. 1:03:2209. A toy coin with signed transactions
  10. 1:18:2110. Merkle trees and inclusion proofs
  11. 1:26:2711. Many nodes: forks and consensus
  12. 1:36:0612. Ethereum concepts on a local chain
  13. 1:46:0013. Solidity basics: a message board
  14. 1:57:1614. A simple token with Foundry tests
  15. 2:07:4715. Calling contracts with ethers.js
  16. 2:20:0316. Final project part 1: TipJar contract
  17. 2:30:2817. Final project part 2: the dApp page
  18. 2:44:0118. Practice project: a one-vote-per-address poll
  19. 2:56:0819. Security basics: finding bugs with tests
  20. 3:06:5820. What's next: an honest road map
Download source code

File: blockchain-full-course-code.zip

Size: 347.8 KB (356,168 bytes)

SHA-256:
22e81dafbfa985542b247877691a3000ba0ff65362eb68ba19ac2114e4407eae

Licence: code is released under the MIT licence, copyright PyInns. See LICENSE and README inside the zip. Free learning code, not production code.

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