{
  "manageEntity": {
    "action": "Save",
    "entityId": "639756",
    "entityType": "Track",
    "nonce": "0xdcfa9a358dc898b9695c331d6da9273194af103ecf858c13493c34fd35945933",
    "signature": "0x0d65e898c9b6afb60d3dfe6246d403615d53bf3abe6edfabc8104593070368f460655eeb793d22b7fab1e3e02aa3498ef81840146370f9c069d7e8b10936b1ea1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}