{
  "manageEntity": {
    "action": "Save",
    "entityId": "860487",
    "entityType": "Track",
    "nonce": "0x5933ec83c58f1f826d727ad5b2658032535ae7e541842e5e5a4000c45d1103d1",
    "signature": "0x888132711d1a08f747165acf0078d20f9886c3602841f5516639453c29aed4f66411a78d1e68f264d38590f0ae27f51d629f569c40ae1ccf5accf464501064a51c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}