{
  "manageEntity": {
    "action": "Save",
    "entityId": "306771",
    "entityType": "Track",
    "nonce": "0x21eede632773451882a7749ab8657ee17a3b263b6d3c4e0bdf1cf4b2f75f6dd4",
    "signature": "0xf64386ab32c8fa748727771dc40995b60a20b4bb001198a21f2157350809f83a1545882f79858748157dca957e13405bdbc804a9f5aa545dba1957ad13360a541b",
    "signer": "0x849b8180f084363b37768C823c174C9786020A66",
    "userId": "817339612"
  }
}