so


K ( nonce) is   

nonce = 231584178474632390847141970017375815706539969331281128078915168015826294532480

after multiply by 64 mod n   (n = order of curve secp256k1)

nonce = nonce * 64 % n
we have result : 864840773131319313704841732789971543806 


so any way how to take it back before multiply by 64?