{
  "manageEntity": {
    "action": "Save",
    "entityId": "813910",
    "entityType": "Track",
    "nonce": "0x5b1ca7adff79d704097ae05f572afe5938d6e3210c043872c03126c65cdbd400",
    "signature": "0x00fac562080a700a03d9fb2d7c55d3ecff2091a81ceaeb2ed435bb94228d918751b5fa15186d25e2baf6e9d0958e499f773fbeab094715d914ae79c0c49e38011b",
    "signer": "0x28945B345Dc8334c21B4e932dA506ca6Fac7e18a",
    "userId": "290283513"
  }
}