# Node.js Blockchain Simulation Guide & Implementation
> Learn how to build a blockchain simulation in Node.js featuring Merkle Trees, Bloom Filters, and round-robin consensus economics.

Tags: blockchain-simulation, nodejs, merkle-tree, cryptography, consensus-algorithm, data-structures, programming-tutorial
## Node.js Blockchain Architecture
An assignment solution covering custom data structures, cyclic mining, and economic simulations within a Node.js environment.

## Network Topology & Wallets
* **Participants:** Closed network of 10 wallets.
* **Roles:** Wallets A-E are Miners; Wallets F-J are Users.
* **Starting Balance:** 100 coins per participant.

## Transaction Fee Economics
* **Deflationary Mechanism:** Base fees are burned.
* **Incentives:** Miners receive a block reward and priority fees.
* **Block Reward:** 60 coins per successfully mined block.

## Technical Components
* **Merkle Tree:** Custom class using recursive SHA256 hashing to generate root hashes for transaction integrity.
* **Bloom Filter:** Probabilistic data structure (MurmurHash approximation) for rapid transaction membership queries.

## Consensus: Round-Robin Mining
* **Mechanism:** Deterministic rotation among 5 mining nodes (A → B → C → D → E).
* **Purpose:** Ensures fair distribution of rewards and load balancing.

## Block Limits & Simulation Parameters
* **Capacity:** 50 transactions per block (49 user transfers + 1 coinbase transaction).
* **Traffic Test:** Simulation processes 200 random transactions to stress-test the mempool.

## Implementation Details
* **Core:** Single-file `main.js` containing Wallet, Transaction, and Block classes.
* **Verification:** Includes routines to validate tampered transactions against the Merkle Root.
* **Execution:** Run via `node main.js` to trigger mining logs and a final financial report.
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