Bridge

To enable seamless operation across multiple blockchain networks—Ethereum Sepolia, Base Sepolia, Arbitrum Sepolia, and Avalanche Fuji—Pixcross implements distinct bridging mechanisms for ERC-20 tokens and ERC-721 NFTs. These bridges allow liquidity and collateral to move securely between chains, supporting a unified cross-chain lending experience.

ERC-20 Bridging with Chainlink CCIP

Pixcross leverages Chainlink CCIP (Cross-Chain Interoperability Protocol) to bridge ERC-20 tokens, such as stablecoins, across supported testnet environments. Chainlink CCIP ensures:

• Secure and decentralized cross-chain messaging,

• Reliable execution of token transfers, and

• Protection against message tampering and fraud.

This integration provides users with a robust and automated way to move fungible assets across chains while maintaining high standards of security and availability.

ERC-721 Bridging (Custom Implementation)

For ERC-721 tokens (NFTs), Pixcross uses a custom-built bridging solution developed specifically for the platform. This bridge does not use Chainlink CCIP and is implemented entirely in-house to meet the specific requirements of handling IP-backed NFT collateral.

Key features of the custom ERC-721 bridge:

• Asset locking and minting logic is coordinated across chains using custom smart contracts.

• Manual message relaying or off-chain services handle the communication between networks.

• NFTs are either burned and re-minted or locked and unlocked depending on the transfer direction.

• Ensures one-to-one representation of the NFT across chains to prevent duplication or inconsistency.

While more manual than the CCIP-powered ERC-20 bridge, this approach gives Pixcross full control over NFT metadata integrity, ownership history, and collateral state—critical for maintaining trust in a lending environment based on intellectual property.