HowToWork.md

Basic Logic

1. eth-contract generate a event on-chain
2. js generate the event proof data off-chain
3. call hmy-contract's function ExecProof(proof-data)
4. hmy-contract verify the proof data then trigger function onXxEvent(...)
5. vice-versa

for example: eth-contract emit event Locked(A, B, C), and will trigger hmy-contract's function onLockedEvent(A, B, C)

hmy-contract's event also trigger eth-contract's onXxEvent

Init a Bridge

eth to hmy

1. call eth-contract CreateRainbow()，then will emit event TokenMapReq(...)
2. trigger hmy-contract function onTokenMapReqEvent(...):
   1. create a new mintable token contract
   2. in the end, emit event TokenMapAck(...)
3. trigger eth-contract function onTokenMapAckEvent(...), bridge init complete.

hmy to eth

vice-versa

Token CrossChain Transfer

eth to hmy

Token IN

1. user call ERC20's Approve to approve eth-contract spent their token
2. user call eth-contract's RainbowTo, it will emit event Locked(...)
3. trigger hmy-contract's function onLockedEvent(), Toekn-In complete

Token BACK

1. user call HRC20's Apprve to approve hmy-contract spent their token
2. user call hmy-contract's function RainbowBack(), it will emit event Burn(...)
3. trigger eth-contract's onBurnEvent(), Toekn-Back complete.

hmy to eth

vice-versa