{
  "manageEntity": {
    "action": "Save",
    "entityId": "685754559",
    "entityType": "Track",
    "nonce": "0xf48cf4f1409892039f2da6a1c948366b515aeb51fca4b05585d55dac8cac578e",
    "signature": "0x86b61d6880bfc729784c7a9b64c7e621f486e206f2761d2c1260f212768c6a2f3548def5d94fa805a6d2c3598179694a69581feb1f882b9cdcdb1758c06511c51b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}