About Blockchain Development
Blockchain development is the craft of building decentralized systems where no single
party controls the data, and this course walks through it in the order most developers
actually learn it. It starts with Blockchain Fundamentals (blocks,
hashing, and distributed ledgers), then Cryptography Essentials and
Consensus Mechanisms so you understand why the network can be
trusted without a central authority.
Next come the two platforms that shaped the field: Bitcoin & the UTXO
Model covers transactions, scripts, and mining, while Ethereum &
the EVM covers accounts, gas, and the virtual machine that runs programs
on-chain. From there, Smart Contracts with Solidity teaches you to
write, test, and deploy contract code.
Wallets & Security covers key management, signing, and the
exploits that have cost the industry billions, and Building dApps
connects contracts to a real front end using ethers.js, Hardhat, and IPFS.
Finally, DeFi, Tokens & NFTs covers ERC-20 and ERC-721 tokens,
lending, and automated market makers, and Scaling &
Interoperability covers rollups, Layer 2 networks, oracles, and bridges: the
skills that separate a demo contract from a system people can trust with real value.
Content
10 modules
01
Blockchain Fundamentals
What a blockchain is, how blocks link together, and why a distributed ledger is tamper-evident without a central authority.
Blocks & ChainsDistributed LedgersImmutability
02
Cryptography Essentials
The cryptographic building blocks behind every chain: hash functions, public-key cryptography, digital signatures, and Merkle trees.
SHA-256Digital SignaturesMerkle Trees
03
Consensus Mechanisms
How thousands of untrusting nodes agree on a single history: Proof of Work, Proof of Stake, and Byzantine fault tolerant designs.
Proof of WorkProof of StakeBFT
04
Bitcoin & the UTXO Model
How Bitcoin works under the hood: unspent transaction outputs, Script, mining, and the peer-to-peer network.
UTXOBitcoin ScriptMining
05
Ethereum & the EVM
The account-based model, gas and fees, and the Ethereum Virtual Machine that executes programs on-chain.
AccountsGasEVM
06
Smart Contracts with Solidity
Writing, testing, and deploying contracts in Solidity: storage, events, modifiers, inheritance, and common design patterns.
SolidityHardhatFoundry
07
Wallets & Security
Key management, seed phrases, and transaction signing, plus the vulnerabilities that break contracts: reentrancy, overflow, and access control flaws.
Key ManagementReentrancyAuditing
08
Building dApps
Connecting smart contracts to a front end with ethers.js, wallet connections, and decentralized storage.
ethers.jsIPFSThe Graph
09
DeFi, Tokens & NFTs
Token standards, lending protocols, and automated market makers, and how composable contracts make up decentralized finance.
ERC-20ERC-721AMMs
10
Scaling & Interoperability
Why base layers are slow and how rollups, Layer 2 networks, oracles, and cross-chain bridges extend them.
RollupsChainlink OraclesCross-Chain Bridges
What You Can Do After This Course
By the end of the curriculum you'll have worked through 5 hands-on projects and
covered the core of what a junior to mid-level blockchain role expects. Concretely,
you'll be able to:
Explain how a blockchain works: how blocks, hashes, and consensus combine to keep a shared ledger honest.
Apply core cryptography: use hashing, key pairs, and digital signatures, and explain how they secure transactions.
Compare chain designs: reason about UTXO versus account models and Proof of Work versus Proof of Stake.
Write smart contracts: build, test, and deploy Solidity contracts to a test network.
Secure your code and keys: spot common contract vulnerabilities and handle wallets and signing safely.
Ship a dApp: connect a front end to your contracts, issue tokens, and integrate with existing DeFi protocols.
Scale and connect: choose the right Layer 2, bring off-chain data on-chain with oracles, and understand the risks of bridges.