{
  "manageEntity": {
    "action": "Save",
    "entityId": "1523792958",
    "entityType": "Track",
    "nonce": "0xff5b21476e75d8502bd35f7587f2c0a605833dbb27386ba384d2965389f94836",
    "signature": "0x7b152c18451c7b84144a0d9cccb1f85033f5a052a186cc55976aa4e4b23e214f38fb7b4efec251513a8c9c5ba98b73a4d4bc1cef667469db0488c5c0e41ca9401b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}