{
  "manageEntity": {
    "action": "Save",
    "entityId": "138345643",
    "entityType": "Track",
    "nonce": "0xa1800e0931753c1a4f4d47205f841aa8e95f53310bb603c10288090d699b0e90",
    "signature": "0x3382f62d6744ca71b23df992af8205037037d9431bbff4a6d7c55e96c23a21090de41f6fd414462e00fcff60a07828c88f389e2c9ef014d533bc9cad05744c961c",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}