NIP-46 defines how to do remote signing using Nostr relays as the infrastructure for sending pre-signed and signed information back and forth between the signer and the client.

NIP-50 defines how clients should perform search queries from relays.

And nostr:nprofile1qyvhwumn8ghj7un9d3shjtnddakk7um5wgh8q6twdvhszythwden5te0dehhxarj9emkjmn99uq3kamnwvaz7tmjv4kxz7fwdehhxarjwpkx2cnn9e3k7mf0qyvhwumn8ghj7un9d3shjtnndehhyapwwdhkx6tpdshszymhwden5te0wahhgtn4w3ux7tn0dejj7qg6waehxw309ac8junpd45kgtnxd9shg6npvchxxmmd9uqjqamnwvaz7tmjv4kxz7fwdehkgetjw4hxuetjwvhxuet5wahhy6e0qy2hwumn8ghj7un9d3shjtnyv9kh2uewd9hj7qghwaehxw309aex2mrp0yhxummnw3ezucnpdejz7qgwwaehxw309ahx7uewd3hkctcqyqlhwrt96wnkf2w9edgr4cfruchvwkv26q6asdhz4qg08pm6w3djgqzm5c4 covered what a NIP is. 😊