{
  "manageEntity": {
    "action": "Save",
    "entityId": "215340519",
    "entityType": "Track",
    "nonce": "0x2d7235ae1d34f4454dcb8a4d70fe88f597ccf1574cce2754bec76a2cccd048c6",
    "signature": "0x675f4c8c31b1b60816936f07aa1d8f56de078e8e653cfc32b76abd572056b94949bef117a37b1319a7881a3d63f8dc520108b5a7460b0811302006de7e80cb9d1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}