{
  "manageEntity": {
    "action": "Save",
    "entityId": "575947",
    "entityType": "Track",
    "nonce": "0xff4d8db549dd01df92ac63833e28266d415ed2ab7e0ba4d9f69816ae9afb786a",
    "signature": "0x943f92992c70f25bde97fcc8ec4a0d5f12b1ca88547c67058dc925d4b7999a3d4f584bb49e4efc789f147b0722ca7147c0257f55cd8a43e3d0b565de822827891b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}