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TrustlinesCrossChainSwap (TXCS)

Atomic Swaps between the Trustlines Blockchain and Ethereum Main Chain

Smart Contracts

Smart Contracts are inherited from the project https://github.com/kabl/ether-cross-chain-swap

How it works

Lets say Alice wants to convert Ether to NEM:XEM and Bob NEM:XEM to Ether.

Hint: The wording in this Ethereum smart contract is a bit different as in the NEM documentation. In my opinion NEM naming is confusing. Especial in NEM secret represents a hash and is not the real secret.

Steps:

  • Both agree on an exchange rate.
  • Both exchange their addresses to receive the funds.
  • Alice creates a secret and the hash of it.
  • Alice writes to the Ethereum smart contract secretLock(uint256 _lockTimeSec, bytes32 _hash, address _recipient) and adds the agreed amount of Ether.
  • Alice submits the hash to Bob.
  • Bob is now able to validate/audit the 'secret lock' in the Ethereum smart contract.
  • Bob will now create a 'secret lock transaction' in NEM SecretLockTransaction.create(Deadline.create(), new Mosaic(new MosaicId('nem:xem'), exchangeValue), lockTime, HashType.SHA256, secret, Alice.address, NetworkType.MIJIN);.
  • Alice gets notified and can validate/audit the NEM secret lock.
  • Alice will then call on the NEM network a 'secret proof transaction'. SecretProofTransaction.create( Deadline.create(), HashType.SHA256, hash, proof, NetworkType.MAIN_NET);.
  • So Alice will get the XEM:NEM and for her the swap was successful.
  • Bob gets notified by the NEMs secret proof transaction. As it is a public blockchain, Bob sees the proof the real secret.
  • Bob then creates an Ethereum transaction to the smart contract. secretProof(bytes32 _hash, bytes _proof). So Bob will receive the Ether.

Notes

Web3 version 1.x is installed with NPM. Also Truffle comes with Web3 0.2x. The API of these Web3 are not always compatible.