{
  "manageEntity": {
    "action": "Save",
    "entityId": "615584642",
    "entityType": "Track",
    "nonce": "0xcc19304f569ef54d98da4c97fb13dc28cd01ba0d21e315c1d3e6a76dbad89d3f",
    "signature": "0x7a1f0321d33b91c7af8b3c3b7811a7188751867d113f212aac1ee87af81a2cce2c2394b00d2564a53cf01c1d9779db71c21dff1e8f15d1fd8aa1cf369924f6df1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}