{
  "manageEntity": {
    "action": "Save",
    "entityId": "988515",
    "entityType": "Track",
    "nonce": "0x59ffdec7fc57db2cc7eedbf6ff918c3331d381c4731edbe4c74a4326eb4578d1",
    "signature": "0x49ab0a52f01b65b92f3b80ea3e83c85826a6291c5580dd2efc8e95b0fc296e4669ea141e4dcc4f56172e12c7da1b26daecdee041d2d9ea07db6911056b4785171c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}