{
  "manageEntity": {
    "action": "Save",
    "entityId": "1451576778",
    "entityType": "Track",
    "nonce": "0x0c74783dcf349ddbec9e37690a19073ce943e879be9599d29f0bd69990bb7cf2",
    "signature": "0xe9f431e6e376a43d12c7624dc664be5a3181bdfce24905e8098f4fcc6889bc86524cf8eb543476c832bb4490ffe823d93480f0943f62845c71d7795cd507e9731c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}