$tx1="32650049a0418e4380db0af81788635d8b65424d397170b8499cdc28c4d27006";
$tx2="30861db96905c8dc8b99398ca1cd5bd5b84ac3264a4e1b3e65afa1bcee7540c4";
$v=hash('sha256', hash('sha256',$tx1.$tx2) );