{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf290c95178fb16ae52134568a16c467bbdbbebaf408b8d402e5131b6a65d180b",
    "signature": "0x3dc0bfdf8767765107140f21c02e918d739679bc0995093764a72133ce97813f68ec0627ccef9ce86f2eab63c7e710dde7b6087c536b32e8f02a4cdf84f889ed1b",
    "signer": "0x21e530f5EA8E24d2476C3Ff8253D151693719385",
    "userId": "854449345"
  }
}