{
  "manageEntity": {
    "action": "Save",
    "entityId": "369475",
    "entityType": "Track",
    "nonce": "0x6e5a89b3e9babf857791587da09f0ba4b78adf8cdfe452c54f2014f0c942bf7d",
    "signature": "0xff2bcfa01070137689ce1951c6072ac7a5ae765c019e3a5567ea0c19a225398a24e7af238063876deb47046ed4c38304a3e99784e0c8e6f7fd29d02c4cefa4431c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}