{
  "manageEntity": {
    "action": "Save",
    "entityId": "440403064",
    "entityType": "Track",
    "nonce": "0x37593809f9be6df8b5fe990064f5897531027845b9946b685232d3d6b304160c",
    "signature": "0x996715c2ebdec9fb17e67536e7046821cfea469e36e3d468bf3f1d9188e817447602c885a2388bcffd5d7c5148747301572c56f984f7a88965cb2054901c45cb1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}