Just in case somebody does not know how to send
a data byte together with Ether:
If you are using
Geth or
Ethereum Wallet (wich starts Geth in the background):
after typing
geth attach
in a command line, enter:
eth.sendTransaction({from: eth.accounts[0], to:'0x7753A9D834844cFDe5C211ec3912b49f0d8B8e11', value:web3.toWei(0.1, "ether"), gas:100000, data:"0x01"})
to send "0x01" and 0.1 Ether to address 0x7753A9D834844cFDe5C211ec3912b49f0d8B8e11.
Change "0x01" to "0x81" if you want to change your bet or change value and address if you want to risk more or less (see
original post).
In the GUI of
Ethereum Wallet (Mist) just click
SEND and after entering the address and the amount click the
ADD DATA button and enter
01 or
81 in the input field below the button.