{
  "manageEntity": {
    "action": "Save",
    "entityId": "426047",
    "entityType": "Track",
    "nonce": "0x69151ca20eb10f53449906ae90f729a8e737eb7d3ce631ad44491ff3b7722e95",
    "signature": "0x06687ab47af17229c1e2d2353806074b7c70de5beb66354f9ca736bb091ac67c35c0cebe0d23e6e520a743d3da4bafacbab7a2af5ef8d2eb2fe63773f9cfae171c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}