{
  "manageEntity": {
    "action": "Save",
    "entityId": "475750647",
    "entityType": "Track",
    "nonce": "0xc7dbe1df23020e2ff766c412230252946f1aadb98f1347286a9591c6ffb938ce",
    "signature": "0x941afb0db8d03b540cecf90b02a9eb9a554ea29702bf2f2721b5824b7cd513b24a70242c436590c0cc62eb5c7e520279e81c631ed7e933c8a86f27373ead13ee1b",
    "signer": "0x28945B345Dc8334c21B4e932dA506ca6Fac7e18a",
    "userId": "290283513"
  }
}