{
  "manageEntity": {
    "action": "Save",
    "entityId": "219201887",
    "entityType": "Track",
    "nonce": "0x2e0e8b8c23fad9e3e131d0966b38a55b260a573963e52d76254a4815cfc6b273",
    "signature": "0x7c09e3168ca5c87094d402b796d441cb5430b52f56f1ebbdd94a33d6617737b61149bbc68102b4e6068bf18c02f44adac2f0705f21ea8f02cb165b990bb396c31c",
    "signer": "0xcF1BC458908F84936B19Ca8Cf67C751CD647B02b",
    "userId": "310796"
  }
}