{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbf4c5b4c5483b92fb868d2e042e2c5b7e8c85ccfa46bf603f30e50f1410c7e41",
    "signature": "0x721e20595b70ecbbb637f96fb947fe074080356b5aa3e63e6b5e88a78b676ad70f7dc0fb4169197db3e1e23c48df012596eae67c367bc5d313b94a3b5151723a1b",
    "signer": "0x9B2c19D12666dd316e2A4f87E04c1B24d0a8255B",
    "userId": "385103139"
  }
}