{
  "manageEntity": {
    "action": "Save",
    "entityId": "1917571089",
    "entityType": "Track",
    "nonce": "0x12a87e73d576aadef391edd0e5036b321eadc2e08a3dc7472bb05b6e2d2f2b7e",
    "signature": "0x7e7128e0af34bcbb43621558bf8a08b29aa141a224ba9a1f6582de368065aec361e41b323ea700efde58d56010bc7f8c15693463b9db7f2698b77a30528f81f41c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}