# Technical Architecture

### Architecture Layers

JuChain’s technical stack is organized into distinct layers, each handling specific functions:

#### Data Layer

* **Purpose**: Stores all blockchain data.
* **Key Components**:
  * **Blocks**: Include headers (timestamp, previous block hash, Merkle root) and transaction data.
  * **State Database**: Uses Merkle Patricia Trie (MPT) to store account balances and contract states.
  * **Transaction Pool**: Buffers pending transactions for packaging.
* **Features**: Enables fast queries and ensures data integrity.

#### Network Layer

* **Purpose**: Manages node communication and data syncing.
* **Key Components**:
  * **P2P Network**: Peer-to-peer protocol for node discovery and data propagation.
  * **Node Types**: Full nodes (complete data), light nodes (headers only), and validator nodes.
* **Features**: Efficiently broadcasts transactions and blocks.

#### Consensus Layer

* **Purpose**: Maintains network state consistency.
* **Core Mechanism**: JPoSA (detailed below).
* **Features**: 1-second block time for swift confirmations.

#### Execution Layer

* **Purpose**: Processes transactions and smart contracts.
* **Key Components**:
  * **EVM**: Supports Solidity smart contracts.
  * **Gas Mechanism**: Ultra-low transaction fees.
* **Features**: Compatible with Ethereum tools and contracts.

#### Application Layer

* **Purpose**: Provides developer interfaces.
* **Key Components**:
  * **JSON-RPC API**: Enables Web3.js interaction.
  * **Tools**: Developer portal, traffic analytics dashboard.
* **Features**: Simplifies dApp development and integration.

***

### JPoSA Consensus Mechanism

JPoSA is JuChain’s flagship consensus mechanism, blending Proof of Stake (PoS) and Proof of Authority (PoA) for efficiency and security.

#### Core Design

* **Validator Structure**:
  * **Core Validators**: Up to 21, tasked with block production.
  * **Standby Validators**: Ready to replace faulty core validators.
  * **Candidate Validators**: Compete by staking JU tokens.
* **Staking Mechanism**:
  * Users stake JU tokens to become validators or delegate to existing ones.
* **Block Production**:
  * Core validators take turns generating blocks every 1 second.

#### Performance Metrics

* **Block Time**: 1 second
* **Transaction Confirmation**: 2-3 seconds (2-3 blocks)
* **Throughput**: Thousands of transactions per second (varies with network load and optimization)
* **Fault Tolerance**: Tolerates up to 1/3 core validator failures (max 7)

#### Security

* **Voting Weight**: Adjusted based on stake amount and validator track record.
* **Penalty System**: Malicious actions or downtime result in slashed JU stakes.

***

### Network Structure

JuChain leverages a decentralized P2P network with multiple node roles.

#### Node Types

1. **Full Nodes**:
   * Store the entire blockchain and validate all transactions.
   * Ideal for developers or high-reliability needs.
2. **Light Nodes**:
   * Sync only block headers, relying on full nodes for data.
   * Perfect for resource-constrained devices.
3. **Validator Nodes**:
   * Participate in JPoSA consensus, requiring JU staking and uptime.

#### Data Synchronization

* **Block Propagation**: New blocks spread quickly via P2P.
* **State Sync**: New nodes update incrementally from the latest state.

***

### Core Components

#### 1. JU Token

* **Uses**:
  * Pays transaction Gas fees.
  * Staked for consensus and governance.
* **Features**: Secures the network and fuels ecosystem incentives.

#### 2. Block Structure

* **Header**:
  * Timestamp, previous block hash, Merkle root, validator signature.
* **Body**:
  * Transaction list (transfers and contract calls).
* **Size**: Default 2 MB, adjustable as needed.

#### 3. State Database

* **Implementation**: Based on MPT for accounts and contract data.
* **Features**: Fast read/write, optimized for state queries.

***

### Performance Highlights

JuChain’s design optimizes these key metrics:

* **Fast Blocks**: 1-second block time suits high-frequency trading and real-time apps.
* **Low Costs**: Gas fees far below Ethereum, averaging under 0.001 JU.
* **High Throughput**: Parallel processing handles heavy concurrency.
* **EVM Compatibility**: Supports Ethereum contracts and tools with zero learning curve.

***

### Developer Integration

#### 1. RPC Interface

* **Endpoint**: `https://testnet-rpc.juchain.org`
* **Example** (Query block height):

  ```bash
  curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' Response:https://rpc.juchain.org {"jsonrpc":"2.0","id":1,"result":"0x1a2b3c"}
  ```

#### 2. Network Config

* **Testnet**:
  * RPC: [`https://rpc.juchain.org`](https://rpc.juchain.org)
  * Chain ID: 210000
  * Currency: JU
* **Gas Settings**:
  * Minimum Gas Price: 1 gwei
  * Transaction Gas Limit: 5,500,000

#### 3. Tool Support

* **Frameworks**: Truffle, Hardhat
* **Block Explorer**: `https://juscan.io`

***

### Comparison with Other Blockchains

| **Feature**           | **JuChain** | **Ethereum**  | **BNB Chain** |
| --------------------- | ----------- | ------------- | ------------- |
| **Consensus**         | JPoSA       | PoS           | PoSA          |
| **Block Time**        | 1 second    | 12-15 seconds | 3 seconds     |
| **Transaction Cost**  | < 0.001 JU  | High          | Medium        |
| **EVM Compatibility** | Yes         | Yes           | Yes           |

JuChain shines in block speed and cost efficiency.

***

### Summary

JuChain’s technical architecture—driven by JPoSA, EVM compatibility, and an efficient network design—delivers a fast, affordable blockchain platform. Its 1-second block time and high throughput make it ideal for traffic-heavy, real-time dApps. Developers can use this guide to integrate with JuChain and start building today.
