{
  "manageEntity": {
    "action": "Save",
    "entityId": "1961844209",
    "entityType": "Track",
    "nonce": "0x03eeb4bcf6eaedeab3687ac20d2dbc60ec039144c976e850857227c991613b8a",
    "signature": "0x08ea9ea3431ef300a4225d3723cd723304f1d43e789e48953702727e9de0aa36799900398b67e486bfb05ec11fc9265fb002ea4171751a0c6e4358296b9726331b",
    "signer": "0x354f479338B7F1593E5Ed2Bdb91a09c4bD12996C",
    "userId": "381478870"
  }
}