{
  "manageEntity": {
    "action": "Save",
    "entityId": "187671",
    "entityType": "Track",
    "nonce": "0x88a158a789193e7ec8adb706aa4e8225bffda555e18b964e87ce7db8957b8d6c",
    "signature": "0x2d3a6921390b935e5e6b8b056dde7a8e5771041add44632c5c8d2d217e615b8f2965b108de2668d10614099649695e9b26f988dd9570a49b7c80504b28e642061c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}