null on Nostr: 活着？

{ "id": "c091cc9db2e83b08cb8436581e6e35cbaea5bfbee6aeb41f7d4f983267e03283", "pubkey": "f0f57d4a93f8722f8cbd1b332d9e8c0f1c52609770e6134dc892fbc2eef4ef6a", "created_at": 1679107823, "kind": 1, "tags": [], "content": "活着？", "sig": "60078d231aa0d82b5498208a19ae8b59005d3bfdf4a1226b0c8cdb3e1067415e539429cf7b65259306fb1570b8306783badf4a85fc13af6fdeb0368f794f08e9" }