nostr:nprofile1qqsps5kc8c4e6yh62cg8r0lpt8l44egs4u0undgms4feed4gzjr0ypcpz4mhxue69uhk2er9dchxummnw3ezumrpdejqzrthwden5te0dehhxtnvdakq6a6wqx generate a single QR code that encodes for your seed phrase? Please explain further because this sounds sketchy to me unless I am not understanding correctly