An extra titbit for anybody who is interested in this: The Weierstrasser curve used by Bitcoin (secp256k1) has an interesting public key where the secret key is

An extra titbit for anybody who is interested in this: The Weierstrasser curve used by Bitcoin (secp256k1) has an interesting public key where the secret key is 1/2. What's so special about this (apart from the fact that the key is a nothing-up-my-sleeve number) is the x-coordinate of that public key has 162 leading 0-bits (out of 256). This can be used for saving Bitcoin transaction fees as they use the DER encoding to compress these leading 0 bits.* Considering that it is highly unlikely that this is a coincidence it is believed that the designers of the secp256k1 curve chose the generator point based on that value. They looked at that point (1/2, P) and then they defined the generator point G as 2*P. * NOTE: don't try this at home. If you're not clever about this you will lose all your Bitcoins.