CrossCurve SuperDVN

Overview

CrossCurve SuperDVN is a verification module (DVN, Decentralized Verification Network) compatible with the LayerZero DVN standard. It leverages the CrossCurve Consensus Bridge as its internal mechanism for cross-chain message verification and transmission.

SuperDVN serves as a sovereign data verification layer for cross-chain applications, providing a decentralized, secure, and resilient environment for communication between blockchains.

Architecture

LayerZero uses DVNs to achieve decentralized verification of cross-chain message transfers. However, ensuring robust security requires two or more independent DVNs.

For developers, SuperDVN appears as a single DVN, but internally it contains a consensus layer composed of multiple messaging protocols, combining their verification capabilities for enhanced reliability and trustlessness.

Message Flow:

• The OApp application sends a message on the source network to the LayerZero Endpoint contract.

• The LayerZero protocol processes the message in its standard way and forwards it for verification to the CrossCurve DVN contract.

• The CrossCurve DVN prepares and sends the verification data to the CrossCurve Gatekeeper.

• The Gatekeeper dispatches this data through multiple messaging protocols.

• Each protocol, following its standard cross-chain messaging procedure, independently delivers the data to the CrossCurve Receiver contract.

• The Receiver collects the incoming message instances and emits events upon receipt.

• The external service CrossCurve Pusher monitors these events. Once the original message and a sufficient number of verification confirmations are detected, it submits an execution transaction to the CrossCurve Receiver contract.

• Upon receiving the transaction from CrossCurve Pusher, the Receiver checks that the original message and all required protocol confirmations are present.

• If verification succeeds, the data is passed back to the CrossCurve DVN, which forwards the verification data to the ReceiveLib contract to complete the verification process and allow LayerZero to proceed with message delivery.

Integration with LayerZero

SuperDVN is fully compliant with the LayerZero DVN Standard, which provides:

Ability to connect as a primary DVN for cross-chain messaging between networks using LayerZero.

Support for custom DVN, allowing SuperDVN to be used for specific applications.

Compatibility with the LayerZero ecosystem without the need to modify smart contracts.

Supported Protocols

SuperDVN leverages CrossCurve Consensus Bridge to enhance verification security.

Currently, the Consensus Bridge supports the following messaging protocols:

• CrossCurve Oracle Network

• LayerZero

• Axelar

• Router Protocol

Connection and Integration

To integrate SuperDVN into an OApp, you need to configure the ULN as specified in the LayerZero documentation.

Here is an example configuration for using a single SuperDVN:

SuperDVN.address — the address of the SuperDVN contract on the OApp network that sends the message.

const ulnConfig = {
    confirmations: 1,
    requiredDVNCount: 1,
    optionalDVNCount: 0,
    optionalDVNThreshold: 0,
    requiredDVNs: [SuperDVN.address],
    optionalDVNs: []
  };


  const encodedUlnConfig = ethers.utils.defaultAbiCoder.encode(
    ["tuple(uint64 confirmations, uint8 requiredDVNCount, uint8 optionalDVNCount, uint8 optionalDVNThreshold, address[] requiredDVNs, address[] optionalDVNs)"],
    [ulnConfig]
  );

Contracts

To configure the OApp, use the following contract addresses:

Network	CrossCurve SuperDVN Address
Ethereum Sepolia Testnet	0xA8e6c5932fc3F0BBd4532e911BC1e14db78F35e9
Arbitrum Sepolia Testnet	0x2245F56774fa53966643bCeC94F916cBd16AA854