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What is a Ledger and How Does It Work?
What is a Ledger and How Does It Work? - Flow Card Image

In the context of blockchain, a ledger is a digitized, decentralized, public ledger where all transactions are recorded. Unlike traditional ledgers, blockchain ledgers are not controlled by a central authority, adding transparency, data integrity, and other benefits.

How Does a Ledger Work in Blockchain?
A blockchain ledger consists of blocks, each containing transaction data. These blocks are linked in a chronological order, forming a chain. Once data is added to a block, it cannot be altered, ensuring immutability and security.

Key Components of a Blockchain Ledger:
1. Data: Transaction details or other relevant information.
2. Hash: A unique identifier for each block, similar to a digital fingerprint.
3. Previous Block's Hash: Links the current block to the previous one, maintaining the chain.
4. Timestamp: Records the exact time the block was created.
5. Nonce: A random number that miners solve for during the mining process.

Types of Ledgers in Blockchain

1. Public Blockchain Ledger:
- Access: Open to anyone.
- Transparency: High, as all transactions are visible to the public.
- Examples: Bitcoin, Ethereum.

2. Private Blockchain Ledger:
- Access: Restricted to certain participants.
- Transparency: Limited to authorized users.
- Examples: Hyperledger.

Benefits of a Blockchain Ledger:
- Enhanced Security: Immutable and encrypted, making data tamper-proof.
- Transparency: Public ledgers offer complete transparency, building trust.
- Efficiency: Automates transaction verification, reducing errors and speeding up processes.
- Distributed: Data is spread across multiple nodes, making it resistant to hacking.
- Data Integrity: Ensures accurate and reliable data through consensus algorithms.
- Traceability: Easy tracking of transactions, useful for supply chain management.
- Immutability: Data, once recorded, cannot be altered or deleted.

How a Blockchain Ledger Works:
1. Transaction Initiation: A new transaction is created and broadcast to the network.
2. Verification: Nodes in the network validate the transaction using consensus algorithms.
3. Block Creation: Verified transactions are compiled into a block.
4. Hashing: The block is hashed, and the hash is added to the block.
5. Adding to the Chain: The block is added to the blockchain, linking it to the previous block.
6. Distribution: The updated ledger is distributed to all nodes in the network.

Resources:
https://tinyurl.com/uzfrnvzb
https://tinyurl.com/y45w455w
https://tinyurl.com/2vdr7h8h - MIT Lecture

Categories : Computer Science

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