{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3a3cecec6c343fa62daf436112d2e40dac6226f5be805cbaddc5c627f370b69b",
    "signature": "0x615b9f685263b0d55e832612134b0be4526a666ac69bf7096b5d0ad1fc07a66e23742bcdfc75456f74256c0d0845c0bbf51d0dc6ed2cc3b7f48944de5a872cc31c",
    "signer": "0x3aF7353Ab58140e3Eae38487Cd5b5297Fa85461C",
    "userId": "869302667"
  }
}