{
  "manageEntity": {
    "action": "Save",
    "entityId": "135764243",
    "entityType": "Track",
    "nonce": "0x7457f1ba43fba9650f4923497552c2ba2d4eaca6c83a65c5ebfa8e9663219494",
    "signature": "0x3ca2da89e6c1e642138967d62030890ff1ebe7b14ff1cb03110a75e0494917311a0a4a6998e225420c35eceba251c3708412d1a6fa1f1c456e815c0d4162bf821b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}