{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf25bbc3614770f47098e1b37954011bf0910c4c6bd0021dd4d5f3f069eb86f6c",
    "signature": "0x8399e90284fe5ff40bfc0784228fb3bf12f4237d40e050824fb18e2b4d789e5a268eda30c75e95d99c0f58f5e1190c9f888f62cb91739c5e70b2d82e2951aafc1b",
    "signer": "0x43138Bb0E0DC73645D78d006b44b4833ee194c92",
    "userId": "187777759"
  }
}