blobs on Nostr: how do i get one?

{ "id": "9d1bad5a33cf7e5d4179471e4fd0b350f592701740091dc2734cfef6d27b18ae", "pubkey": "c2314ef9c5c090ea6b522355467071c1077bc52452acf7021f79e900e688cb48", "created_at": 1672895920, "kind": 1, "tags": [ [ "e", "493f0dbe89757447c27db734e3724417fe77c19b82eb2dd179d196460920287a" ], [ "p", "f1f9b0996d4ff1bf75e79e4cc8577c89eb633e68415c7faf74cf17a07bf80bd8" ] ], "content": "how do i get one?", "sig": "a355c0e987698ef82bd84a9b76d9a01a78cb4f128caed35d63d31844b920bdcf5e0a041afd63f593fa907f4ca3629088139fa5c4eac6e51c5a60347ff1c90be2" }