{
  "manageEntity": {
    "action": "Save",
    "entityId": "328475727",
    "entityType": "Track",
    "nonce": "0x3b5edde7239831612f8233342a256e0e33f342e6292754c672942bb5b5c24634",
    "signature": "0x40099f15cb189abd4747914bc6e72b22f99e18bcc44cae0044829e29ee41169234fe3b809eb9ba738727581d79cc6a7544935d53586383618b3cd3d0a4e75bb21b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}