{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x39475389f24f2b0cad2145f17213c51ad671003480a5ee5deb18bf9309145d61",
    "signature": "0xee5ab3d06bfba09759b6d6dcfaa9c6baa758f0a1a3bc80ce782bba4801e163e10e62c46f7ef2c26d07e7333cae29bdbc34b4b26b671ca6216c9c2da12f810ea41b",
    "signer": "0xF289E74EB5E141E367e98D78c951C98e093E6Ae4",
    "userId": "273007816"
  }
}