Overview

The contract Remittance.sol allows Alice to send funds to Bob through Carol's Exchange shop. Alice sends Ether and Bob receives USD.

Alice =(ETH)=> Carol =(USD)=> Bob

Only the contract and truffle test suite exist. The web interface has not been implemented.

Requirements

• Implemented

  • There are 3 people: Alice, Bob and Carol
  • Alice wants to send funds to Bob, but she only has ether & Bob wants to be paid in local currency.
  • Carol runs an exchange shop that converts ether to local currency.
  • Passwords should not be sent to the blockchain in cleartext

• Flow

  • Alice =(ETH, password1, password2)=> Remittance Contract
  • Alice =(password1)=> Carol
  • Alice =(password2)=> Bob
  • Bob =(password2)=> Carol
  • Carol =(password1,password2)=> Remittance Contract
  • Carol <========(ETH)========== Remittance Contract

Stretch goals

• Not Implemented
  • Add a commission
  • Add a deadline, after which Alice can claim back the unchallenged Ether
  • Add a limit to how far in the future the deadline can be
  • Add a kill switch to the whole contract
  • Plug a security hole (which one?) by changing one password to the recipient's address
  • Make the contract a utility that can be used by David, Emma and anybody with an address
  • Make you, the owner of the contract, take a cut of the Ethers smaller than what it would cost Alice to deploy the same contract herself