kr on Nostr: why both?

{ "id": "c5775a727b8b84ad96270d90fc43f3a325596fa8a845cea70b1fb5603d41a543", "pubkey": "08b80da85ba68ac031885ea555ab42bb42231fde9b690bbd0f48c128dfbf8009", "created_at": 1676664911, "kind": 1, "tags": [ [ "e", "bbc2978a1a0fe9538da991ff8281ea03609ed470013dd77b3e17d160c37b9a62" ], [ "e", "aed09fda5e92a391f87da4693445205b9fb97334542330188fcab1872028cbc2" ], [ "p", "de9c5fb60e930b8a6bc7fa8d455d8333d1ad24122bb791ac156c68ff8ece4a2a" ] ], "content": "why both?", "sig": "8b11373f310534e7ecedd5b1d35847bccc6ab4dde74efe3d0617953ca97e54c008900ba7740a63201e206e503ae00bac586fa349eed99b7ac4f5a21c928815ea" }