{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0e39d8a00b650a843323771dc6b1cee5aa3fb815d7fef3ee4c29b884d7e369c1",
    "signature": "0x80b10030a58ba9b6818f8a1ec6519e8d5036f4bed2c48ffca86b114e9a58074b6a0b14a1f2cb371e42287e6c03297a1138148917934fec357dd3d12354632c601b",
    "signer": "0xEF11C1F7894D0278999f55E434AF53a9c51533c9",
    "userId": "506951677"
  }
}