{
  "manageEntity": {
    "action": "Save",
    "entityId": "987649401",
    "entityType": "Track",
    "nonce": "0x3cf1b8f6fe0f2e78ce909f7006a3c3d81d36011d4a4c352f79812fa18ac7ec9d",
    "signature": "0x2aff9b867d169ea3948dfcc138d8a287923560757316fcd4b1c7408c4580510d4efe7fb0c834d8e25db94a4127b7c222df5ba6a6f4c7df4ef3c60eeb6641f1f61c",
    "signer": "0x767f09338Ac6CE8645c0a76a17a560429b582132",
    "userId": "520958130"
  }
}