Having heard what Marty and nostr:nprofile1qqsgt0d4sa0pz0wvn9yck36xxezf3qhwzksu0q254vruqed5wvuavusyfdmyk use for cold storage, how do you recommend converting BTC in cold storage to an offramp for local currency? E.g., BTC held in a nostr:nprofile1qydhwumn8ghj7un9d3shjv3wdehhxarjv9ekjcfwdejhgtcpzamh...