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Orbit Bridge logoOrbit Bridge


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Tokens:

Description

This project includes unverified contracts (CRITICAL).

Orbit Bridge is part of the Orbit Chain project. It is a cross-chain bridge that allows users to transfer tokens between supported blockchains. Tokens are deposited on the source chain and "representation tokens" are minted on the destination chain. Deposited tokens are not precisely locked and can be used in DeFi protocols by Orbit Farm. Accrued interest is not passed directly to token depositors. Bridge contract implementation and farm contract source code are not verified on Etherscan!

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Risk summary

Note: This project's overview requires more research and might not present accurate information. If you want to contribute you can edit the information on Github. Alternatively you contact the project team on Twitter and encourage them to contribute a PR.

Technology

Principle of Operation

Note: This section requires more research and might not present accurate information.

Orbit Bridge is a cross-chain bridge that allows users to transfer tokens between different blockchains. Tokens are deposited on the source chain and "representation tokens" are minted on the destination chain. When a user deposits tokens to an escrow contract on Ethereum, a message is relayed to a group o validators via Orbit Hub contract on Orbit chain to a minter contract on a destination chain, where "representation tokens" are minted. Deposited tokens are not locked and can be used in DeFi protocols by Orbit Farm. When a user deposits minted tokens on the destination chain, they are burned and a message is relayed to validators through Orbit Hub contract on Orbit chain to Ethereum vault, which releases the tokens if enough liquidity is available. Bridge contract implementation and farm contract source code are not verified on Etherscan.

  1. Bridging transactions

Validation

Note: This section requires more research and might not present accurate information.

Orbit Bridge actors include Operators and Validators. Operators relay data between Orbit Chain and supported chains, while Validators build multi-sig based consensus on validity of transactions.

  • Users can be censored if validators decide to not pass selected messages between chains (CRITICAL).

  • Funds can be stolen if validators relay a fake message to a destination chain to mint more tokens than there are locked on Ethereum thus preventing some existing holders from being able to bring their funds back to Ethereum (CRITICAL).

  • Funds can be stolen if validators relay a fake message to Ethereum chain allowing a user to withdraw tokens from Ethereum escrow when equivalent amount of tokens has not been deposited and burned on destination chain (CRITICAL).

  • Funds can be stolen if there's an exploit in contracts that invest user deposit (CRITICAL).

  • Funds can be frozen if validators don't relay messages between chains.

  • Funds can be frozen if there's insufficient liquidity of requested token in escrow.

  1. Orbit Bridge - How it works

Permissioned Addresses

The system uses the following set of permissioned addresses:

Smart Contracts

The system consists of the following smart contracts:

Bridge contract, Proxy, Escrow, Governance. Source code of implementation is not verified on Etherscan. This contract stores the following tokens: ETH, USDT, DAI, USDC, WBTC, MATIC.

USDT Compound Farm 0x378F…a4d9

The source code of this contract is not verified on Etherscan. This contract stores the following tokens: cUSDT.

DAI Compound Farm 0xBe03…aCd0

The source code of this contract is not verified on Etherscan. This contract stores the following tokens: cDAI.

USDC Compound Farm 0x8304…2474

The source code of this contract is not verified on Etherscan. This contract stores the following tokens: cUSDC.

WBTC Compound Farm 0xd910…08Da

The source code of this contract is not verified on Etherscan. This contract stores the following tokens: cWBTC.

The current deployment carries some associated risks:

  • Funds can be stolen if a contract receives a malicious code upgrade. There is no delay on code upgrades (CRITICAL).

  • the source code of unverified contracts contains malicious code (CRITICAL).