username on Nostr: Hello world

{ "id": "456db803ca83071744b8459aebbe4dc0f0845049d4218384a5b5b9af7873c8a8", "pubkey": "529db400d46dbb2be5b021769c1da0c9dd22a1ed48c27676c3dc570a94fcbce3", "created_at": 1675318538, "kind": 1, "tags": [], "content": "Hello world", "sig": "dec87ede461d2350107154f59478ef8b81f0b0f09bd3a24aa9634b17a51f233de78676aebc262244c62432199d6bfd3902c08d06f6398f385e3dab4c658aa926" }