This is a library of useful functions for dealing with raw Bitcoin transaction bytes inside of Ethereum contracts written in Solidity.
It has been created with the intention of on-chain processing of output from BTC-relay.
This library is still in development and should not be relied upon. There are probably bugs and the API may change.
Verify that the raw_transaction has an output sending at least
value to btc_address:
var success = BTC.checkValueSent(raw_transaction, btc_address, value);
success == true;
n.b. btc_address must be in binary form (not the standard Base58Check).
Both P2PKH (normal addresses beginning '1...') and P2SH ('3...') outputs are supported.
There are other functions, but I'd only rely on checkValueSent for
now.
Important note: checkValueSent checks if there is an output that
sends at least value to btc_address. If there are multiple
outputs sending to the same address then they don't get added
together.