{
  "manageEntity": {
    "action": "Save",
    "entityId": "1391731410",
    "entityType": "Track",
    "nonce": "0x228d8799f9b7ac9cdd1099f1311225443a55c573d2bb78f738d34b48c53f7026",
    "signature": "0x4eed009b54aee48ac52880f60b951cce455ed675685877e012b70406b291cb8d094f5de561f6fc49190996eb5b12f3ad04d0310a7c5af8598eae79301cfc92d21c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}