The best i can make out is something like this

string Msg="My transaction Text , input/outputs "
Hash=DoubleHash(Msg);
byte[]SendData=privateKey.Encrypt(Hash + " " + Msg);


On the Bitcoin node they must be using the public key to then decrypt "SendData" but I suspected that the public key
could only be used to encrypt data and it did not work both ways around with Secp256k1 and thought therefore something from the public key
was being send to the nodes that somehow got linked back to the double hash so maybe my test code trying to decrypt using the
public key was wrong.

Someone please tell me that encryption with private key can be decoded with the public key using Secp256k1 will you please