{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xdbc7ce7e56a088272c52d6fde16d3e4667e68ce01185bb0c4da86751c0618288",
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    "signer": "0x530FAbE17DCf39F21fF28C09C454943CE483816D",
    "userId": "140097"
  }
}