{
  "manageEntity": {
    "action": "Save",
    "entityId": "764594",
    "entityType": "Track",
    "nonce": "0xe1a212d7aa86c1ff2d09c8cfbf908341526ad9981358824d6455ff020a9b37a0",
    "signature": "0x70c28edb438b143d37771022e0045dd601b64fd30d743fd0d4fce627fbd128a737ce0a2f4a8ac084c77065b21b8d84f56678898c5649d3ea4ff267aec5cf5c6a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}