{
  "manageEntity": {
    "action": "Save",
    "entityId": "703878",
    "entityType": "Track",
    "nonce": "0xf3ce52bfd4331c805be38784bcd7802ee3a6b687d71faaeacfdc1f0103576f44",
    "signature": "0xa6f0e578fcf9ae05ce66a6c5d515ade3bad755e20f05ec964c86657ca6ad338c17c3bed97237aec02be419c2f741966a92ddbacdb380f739b6bbb273230c49b01c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}