{
  "manageEntity": {
    "action": "Save",
    "entityId": "400197270",
    "entityType": "Track",
    "nonce": "0xd0590068468ae3b1dc49dc062552d6760e0491709527351d10c87c0485dff4e6",
    "signature": "0xd794e9dae2405247411773ef346384665592fe6cec4f36061ce68d5b03cf23bf0124ad183dc121b4e3ceda5e30daebe32001cc2f821849360001c7b672bc5deb1b",
    "signer": "0xdA0eFB0e7b973C487c12501759aDb23012CB5248",
    "userId": "178070"
  }
}