tigs on Nostr: What is this!?

{ "id": "e4d3d7f40a06de22d1df099ea1be762833d6fa5ab0f324a8c07888af2b8c034b", "pubkey": "079d727bee3d805e24758861ea4d028b2e6a37805f8db45bf8045bf900099650", "created_at": 1738218008, "kind": 1, "tags": [ [ "e", "73ac521eb3dfee92a36379b683bec8d774058c934a26b6250346d55fec71c0bd", "", "root" ], [ "p", "d49a9023a21dba1b3c8306ca369bf3243d8b44b8f0b6d1196607f7b0990fa8df" ] ], "content": "What is this!?\n", "sig": "ff84e56b429f4b8520f82ff1d666baa8f3c63882f748d210a3076ff11199986f1b6f78d97c0c8e4e94efca783a9f2d1bc2104886162d4b2b822a31a17cd8e7d3" }