{
  "manageEntity": {
    "action": "Save",
    "entityId": "747357",
    "entityType": "Track",
    "nonce": "0x456378eab504740d2cfdf5b0266c2ad9fddb900508dfbc317c6bda3f40a32c33",
    "signature": "0x051610ce805a2dca028b408ebfafa02f7aad45c2255eda2bc35e99f8921c0eb072df4ceaf07d04064eb6115cac39540a0898eec052b8ca180a46b0db9207fa9b1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}