AggchainProofGen is the **advanced security component** for chains that need mathematical proof of their operations' validity. While basic chains can use simple signature-based verification, some chains require comprehensive **[state transition proofs](/agglayer/core-concepts/state-transition-proof/)** that verify both internal chain operations and cross-chain bridge activities.

A [Global Exit Root (GER)](/agglayer/core-concepts/unified-bridge/data-structures/#global-exit-root) is a **cryptographic hash** that represents the current state of all cross-chain bridge activities across the entire Agglayer ecosystem. It's computed as:

**What it really does**: AggchainProofGen is the **security expert** of the AggKit team. While basic chains can use simple signature-based verification, some chains need [**state transition proof**](/agglayer/core-concepts/state-transition-proof/) that their operations are valid. AggchainProofGen generates these advanced cryptographic proofs.




title: Agglayer Native Bridge

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Agglayer Native Bridge

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Direct blockchain operations with Agglayer bridge contracts for maximum control and flexibility

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Agglayer Native Bridge is the SDK's **Native module** that provides direct interaction with Agglayer bridge contracts and blockchain networks. Unlike Multi-Bridge Routes which uses ARC API for route aggregation, Native Bridge gives you complete control over bridge operations, ERC20 token management, and chain configurations across local, testnet, and mainnet environments.

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<!-- ERC20 Operations Card -->

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ERC20 Operations

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Complete ERC20 token management including balance checks, approvals, transfers, and direct bridge operations with built-in gas estimation.

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<a href="/agglayer/developer-tools/agglayer-sdk/agglayer-native-bridge/operations/erc20-operations/" style="color: #0071F7; text-decoration: none; font-weight: 500; font-size: 14px;">

Learn more →

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<!-- Bridge Operations Card -->

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Bridge Operations

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Direct bridge contract interactions including asset bridging, message bridging, claim operations, and proof generation.

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<a href="/agglayer/developer-tools/agglayer-sdk/agglayer-native-bridge/operations/bridge-operations/" style="color: #0071F7; text-decoration: none; font-weight: 500; font-size: 14px;">

Learn more →

</a>

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<!-- Chain Management Card -->

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Chain Management

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Built-in chain registry with support for custom networks, RPC configuration, and multi-environment setups (local, testnet, mainnet).

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<a href="/agglayer/developer-tools/agglayer-sdk/agglayer-native-bridge/operations/chain-management/" style="color: #0071F7; text-decoration: none; font-weight: 500; font-size: 14px;">

Learn more →

</a>

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Local Testing with AggSandbox

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Complete guide for local development using AggSandbox. Perfect for rapid prototyping with instant feedback and comprehensive debugging.

</p>

<a href="/agglayer/developer-tools/agglayer-sdk/agglayer-native-bridge/step-by-step-guide/native-bridge-locally/" style="color: #0071F7; text-decoration: none; font-weight: 500; font-size: 14px;">

Start locally →

</a>

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<!-- Testnet Testing Card -->

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Testnet Development

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Step-by-step guide for testnet development using Sepolia and other test networks. Validate your integration with real network conditions.

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<a href="/agglayer/developer-tools/agglayer-sdk/agglayer-native-bridge/step-by-step-guide/native-bridge-testnet/" style="color: #0071F7; text-decoration: none; font-weight: 500; font-size: 14px;">

Test on testnet →

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Production Deployment

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Production-ready implementation with mainnet configuration, error handling, monitoring, and security best practices.

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<a href="/agglayer/developer-tools/agglayer-sdk/agglayer-native-bridge/step-by-step-guide/native-bridge-mainnet/" style="color: #0071F7; text-decoration: none; font-weight: 500; font-size: 14px;">

Deploy to mainnet →

</a>

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Choose Native Bridge when you need direct control over bridge operations, local testing capabilities with AggSandbox, or custom bridge logic beyond standard route aggregation. It's ideal for advanced integrations with custom business logic and testnet development workflows.

Consider [Multi-Bridge Routes](/agglayer/developer-tools/agglayer-sdk/multi-bridge-routes/) for route optimization across multiple providers and cross-chain bridging from non-Agglayer chains.

Here's how simple it is to perform direct bridge operations with Native Bridge:

import { AggLayerSDK, SDK_MODES } from '@agglayer/sdk';

const sdk = new AggLayerSDK({

mode: [SDK_MODES.NATIVE],

native: {

defaultNetwork: 1,

customRpcUrls: {

1: 'http://localhost:8545', // AggSandbox L1

1101: 'http://localhost:8546', // AggSandbox L2

},

},

});

const native = sdk.getNative();

const token = native.erc20('0xTokenAddress', 1);

const bridgeTx = await token.bridgeTo(

1101, // Destination network

'0xRecipientAddress',

'1000000000000000000', // 1 token

'0xFromAddress'

);

console.log('Bridge transaction built:', bridgeTx.to);