Simplifi - liquidity defragmentation solution for heterogeneous blockchains.

The work was originally started at EthGlobal Marketmake hackathone https://github.com/digiu-ai/MarketMake

Description

The goal of our project is to create a cross-chain* swap between hetregenous blockchains.

How It's Made

Current version of cross-chain bridge utilises decentralization in spite of using chainlink infrastructure to be hosted on. It comsumes expensive onchain adaters requests signature verification to ensure not really trusted adapter owners to process cross-chain requests

later we speak about versions as follows: POC - proof pf concept version was made during ETHGlobal Marketmake Current - current version with some decentralization features but hosted on chainlink nodes

POC Use cases

• User can swap any Ethereum asset to pegged BSC asset of same type (for example USDT ERC20 <-> USDT BEP20)
• User can swap a token of any type from Ethereum for any existing BSC token (ETH <-> BNB )
• Dexpool protocol can emit new BSC asset, the collateral is proved through Chainlink ETH-to-BTC integration (asset is locked by contract on Ethereum side, proof is send throgh chainlink to BSC, new pegged asset is emited on BSC and sent to user)

POC Architecture

The prototype included functionality

• add ERC20-like asset to DexPool of any configured chain
• make "pair" of two assets not depending to what chain each of them belong
• swap assets between chains with minimum rate calculations
• developed chainlink external adapter script is used to get data from external chain and change state of another chain's smart contract
• "bidirectional" wallet is implemented on front for better user experience

DexPool contract

DexPool is deployed to both Ethereum and Binance Smart Chain networks. The methods like swap, withdraw, addLiquidity are implemented to be used from native chain as well as method reciever is used to be called from external chain through adapter.

Architecture

current version brings decentralization into somehow centralized chainlink ecosystem. We added possibility for multiple adapter to process cross-chain request grained with security checks. Adapters register in smart contract to participate. Adaters requests are checked for convinience onchain.

"whole picture" diagram

integration diagram

Prerequisites to deploy and test

• Ubuntu >= 18, truffle, docker, docker-compose

Local tests and deployment

git clone https://github.com/digiu-ai/simplifi-bridge.git yarn yarn start

After this commands full local stand infrustructure will be rised up To test transfer asset from network1 to network2 and vise versa run:

yarn integration-test:local

Testnet test and deployment ( Rinkeby and BSC testnet)

Deploy

npm run deploy:testnet

On Rinkeby fill Bridge.sol with Links ( #CLIENT_ADDRESS field in addrs_rinkeby.env). Get Link token from https://rinkeby.chain.link/

Test

yarn integration-test:testnet*

Troubleshooting

• check amount of chainlink by addrs_rinkeby.env #CLIENT_ADDRESS
• check amount of eth: 0x3BcB1323A245EEe08CC5aE1Bf62A1EFb2C109048, 0x13929fE14F869D6CD0717b779FF2f935B7cc65aD
• check amount of bnb: 0xFB51894A3540Be1eD5fD5155A20a379bE31Ef2cd, 0x90a3Dc8A52c11a958c67de3B671533707F6A9e82