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if msg.data[0] == 0:
new_id = contract.storage[-1]
# store [from, to, value, maxvalue, timeout] in contract storage
contract.storage[new_id] = msg.sender
contract.storage[new_id + 1] = msg.data[1]
contract.storage[new_id + 2] = 0
contract.storage[new_id + 3] = msg.value
contract.storage[new_id + 4] = 2^254
# increment next id
contract.storage[-1] = new_id + 10
# return id of this channel
return(new_id)
# Increase payment on channel: [1, id, value, v, r, s]
elif msg.data[0] == 1:
# Ecrecover native extension; will be a different address in testnet and live
ecrecover = 0x46a8d0b21b1336d83b06829f568d7450df36883f
# Message data parameters
id = msg.data[1] % 2^160
value = msg.data[2]
# Determine sender from signature
h = sha3([id, value], 2)
sender = call(ecrecover, [h, msg.data[3], msg.data[4], msg.data[5]], 4)
# Check sender matches and new value is greater than old
if sender == contract.storage[id]:
if value > contract.storage[id + 2] and value <= contract.storage[id + 3]:
# Update channel, increasing value and setting timeout
contract.storage[id + 2] = value
contract.storage[id + 4] = block.number + 1000
# Cash out channel: [2, id]
elif msg.data[0] == 2:
id = msg.data[1] % 2^160
# Check if timeout has run out
if block.number >= contract.storage[id + 3]:
# Send funds
send(contract.storage[id + 1], contract.storage[id + 2])
# Send refund
send(contract.storage[id], contract.storage[id + 3] - contract.storage[id + 2])
# Clear storage
contract.storage[id] = 0
contract.storage[id + 1] = 0
contract.storage[id + 2] = 0
contract.storage[id + 3] = 0
contract.storage[id + 4] = 0
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