{
  "manageEntity": {
    "action": "Save",
    "entityId": "1050342",
    "entityType": "Track",
    "nonce": "0x6bdc0193881486744a479140fe2295a15b5494ee6f75c32009743a474e5974cf",
    "signature": "0xd7dca6265352eab7d79566797ed14fe4332f99f65708bd4d4f5884da770b066659875b97cfefa260a83854a273804690928c7b76cb9b1cbafc713c1237a79e441c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}