{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x25749db38cfc17aede2c79a579af0e3ca39856c9413cd04ea02b913c81679196",
    "signature": "0x2488a975f8e5c58da6fe166060ef40680b5521621b330be9b4c063513c93771a456287d117e3b3278ff4d5004309a8f5248ec65b1a87efec7e107dfbc57c338e1b",
    "signer": "0xDccEC5d3AD9305e7ec833AA1050e738DCB53002e",
    "userId": "235716967"
  }
}