Im confused. what determints if its odd or even? Are you looking at tx hash? block hash?
Thanks
The first digit of provably fair hash determine odd or even.
Provably fair hash value of bet is hash SHA256 of string : [txid]:[secretkey]
[txid] is bitcoin transaction id of your payment.
[secretkey] is secret key given day.
Please read details here
http://oddevenbets.com/provablyfair.php