{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9f34502b0af677b95139337576a43a2fc40e135ea187f038a3e78081acd9246e",
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    "signer": "0x831781d5BfA1e53a8D196A43Fa8eBF7D9DBF049E",
    "userId": "128365105"
  }
}