Compute EC_KEY starting from X or Y coordinate only

[Billy Brumley]

>         EC_GROUP* group         = EC_GROUP_new_by_curve_name (NID_secp256k1);

> "c16b4ce0532f5dc9d09114fe121d3956ae84f9eb677a0d4bdac1d3af7a91950c";

I don't believe there's a point on secp256k1 with that x-coordinate.
If you check the failure reason for
EC_POINT_set_compressed_coordinates_GFp in the debugger, that is
probably what it is telling you.

Where did this curve / x-coord pair come from?

BBB