# Cross-Chain Tokens

## Introduction

The blockchain ecosystem is highly diverse, with numerous blockchains supporting smart contracts such as Ethereum and others. Trevo enables token issuers to operate on these external chains while maintaining institutional-grade compliance through its native infrastructure.

This capability significantly enhances flexibility for issuers and unlocks broader market reach for token holders, without compromising legal or regulatory integrity.

## Architecture

Trevo’s cross-chain integration architecture allows for seamless asset representation and compliance enforcement across both Trevo and Ethereum-compatible blockchains.

### Core Components

* **Trevo L1 (Root Chain):** The primary chain where compliance logic and settlement authority reside.
* **KYC & Identity Binding:**
  * Token holders complete KYC on Trevo.
  * Their Ethereum-compatible wallet addresses are cryptographically bound to their verified Trevo identity.
  * All future actions by this address are associated with off-chain identity data stored securely by Trevo-authorized Identity Providers.
* **Token Deployment:**
  * Issuers deploy ERC20 or ERC-3643 (or similar) tokens on Ethereum-compatible chains.
  * Trevo provides an open-source **Compliance Plugin** that is embedded into the token contract.
  * Token issuers cryptographically link the token to its corresponding asset on Trevo L1.

### Token Operation Flow

1. **Token Transfer Initiated** on the Ethereum-compatible chain.
2. **Token is Temporarily Locked** on sender’s address.
3. **Proxy Compliance Operation** is created on Trevo L1.
   * Compliance checks (KYC, AML, jurisdictional rules, issuer policies) are executed by Trevo’s Compliance Providers.
4. **Compliance Result** is pushed back via an Oracle to the Ethereum-compatible chain.
5. **Token Transfer is Executed or Reverted** based on the compliance verdict.

## Key Benefits

* **Interoperable Compliance:** Enforce Trevo-grade compliance on any EVM-compatible blockchain.
* **Decentralized Identity Binding:** Securely link user identities across multiple chains.
* **Pluggable Architecture:** Trevo’s Compliance Plugin can be added to any new or existing token on Ethereum-compatible blockchain.
* **Single-Point Token Configuration:** Manage token and compliance logic on Trevo, operational across multiple chains.
* **Unified Compliance Infrastructure:** Avoid duplication - identity and compliance providers work solely with Trevo.
