{
  "manageEntity": {
    "action": "Save",
    "entityId": "1887620330",
    "entityType": "Track",
    "nonce": "0x6368a4f1952ddf5c0cb77b8666c27e3b65ae2a0b809c295914372827e8386529",
    "signature": "0x9e3b6cb1a17a41afc44ae0deebff3e4b79401dc152220b1c99a638ebd589a9691407acd2a05992a0cf4767a500da59b11772eee99f435f398178901ca87c6e1d1c",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}