Quote from: interiawp on Today at 01:19:12 PM

so

K ( nonce) is

nonce = 231584178474632390847141970017375815706539969331281128078915168015826294532480 as integer not as point!

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?

Well, I don't know what you are trying to reach but (nonce * 64)%range != 864840773131319313704841732789971543806.
You did the following instead:
range = fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141
nonce = 2000000000000000000000000000000000000000000000000000000000219e980

nonce%range = 28aa24632a16ebf88805b42e661ad66fe (864840773131319313704841732789971543806)