{
  "manageEntity": {
    "action": "Save",
    "entityId": "550349643",
    "entityType": "Track",
    "nonce": "1792675699337260756",
    "signature": "0xad17e08caa9c832e66c1be0db4d6f2fa0ba6f8cdbde43fff3603a1ed09466d1d543b052b00076683131e433d6f853d5c5447fbe76ab16c432f82123828ac7d531c",
    "signer": "0x1007e09532BE90331E035838A9E2E0700bB9741a",
    "userId": "329513359"
  }
}