{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x549f7635881d6b9d76cf64b36c7e6235b3de50bf62148e2db29058e49d57402e",
    "signature": "0xd2846cdc33c57b4e01df3521c62ec12f4426a64e9d44b608e8e4449547418d0327827c01828483b775fe232ad497dab24e96b8714893ed6a8b18beb5547b1e941b",
    "signer": "0xDC9FB11483106d427BaC29ff4bf0E03f11b4e19E",
    "userId": "5500"
  }
}