Udemy – Blockchain: Build, Secure and Deploy Real-World Applications
English | Tutorial | Size: 24.44 GB
Learn blockchain from fundamentals to smart contracts, security, Hyperledger, real-world applications across industries.
A warm welcome to the Blockchain Masterclass: Build, Secure, and Deploy Real-World Blockchain Applications course by Uplatz.
Blockchain is a distributed ledger technology (DLT) that records transactions across a network of computers in a secure, transparent, and tamper-resistant way.
Instead of storing data in a single central database, blockchain distributes identical copies of the ledger across all participants (called nodes). Every new transaction is validated by the network and grouped into blocks, which are then linked together in chronological order-forming a chain of blocks, hence the name blockchain.
How Blockchain Works
Transaction Initiation
A user requests a transaction (for example, sending cryptocurrency, recording a contract, or logging supply chain data).
Transaction Broadcast
The transaction is broadcast to a network of computers (nodes).
Validation
Nodes validate the transaction using a consensus mechanism such as Proof of Work (PoW) or Proof of Stake (PoS).
This ensures the transaction is legitimate and prevents fraud or double-spending.
Block Creation
Validated transactions are grouped together into a block.
Each block contains:
A list of transactions
A timestamp
A cryptographic hash of the previous block (linking it securely in the chain)
Adding to the Chain
Once verified, the new block is added to the existing chain of blocks.
Because every block links to the previous one, altering data in a block would break the chain, making it extremely tamper-resistant.
Distributed Ledger Update
The updated blockchain is replicated across all nodes in the network.
Every participant now has the same trusted copy of the ledger.
Key Features of Blockchain
Decentralization – No single central authority; control is distributed.
Transparency – All participants share the same ledger and can view transactions.
Immutability – Once data is recorded, it cannot easily be altered.
Security – Cryptography protects data integrity and user identities.
Consensus Mechanisms – Ensure agreement on valid transactions.
Example in Practice
Imagine Alice sends 1 Bitcoin to Bob:
The transaction request is broadcast to the network.
Nodes validate Alice has enough balance.
The transaction is grouped with others into a block.
The block is validated and added to the blockchain.
Bob receives 1 Bitcoin, and the ledger is updated across the network.
Blockchain Masterclass: Build, Secure, and Deploy Real-World Blockchain Applications – Course Curriculum
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