R Value and Lattice Attack Questions

Hey all. Does anyone know what it means when the R value starts with 0? Also, how can I find the msb bits for a lattice attack?

So about the R value, in ECDSA, you got three integers (r, s, v) for every curve. The R [1...n-1] is basically the x-coordinate from a random point on the elliptic curve. It can start with a leading zero since it's random... As for the msb bits, you might want to check some cryptographic papers or guides on lattice attacks. They usually have the details you're looking for. Not sure how deep you want to go with this, but good luck!