From the privacy policy when installing:
From the client:The BitComet Software (the Software) automatically sends only standard, limited information to BitComet, which may be retained in BitComet's server logs. We do not associate this data with personally identifying information about you. The Software does not send any information about the files you are downloading, unless you enable the function of "Search for mirrors" while downloading in HTTP/FTP protocol.
This translates to:POST /xmlstats/ HTTP/1.1
Accept: */*
Accept-Encoding: gzip
Connection: close
Content-Length: 281
Content-Type: application/x-www-form-urlencoded
Cookie: xxxxxxxxxxxxxxxxxxxxx
Host: inside-stats.bitcomet.com
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322)
Query=%3C%3Fxml%20version%3D%221.0%22%20encoding%3D%22UTF-8%22 %20standalone%3D%22yes%22%20%3F%3E%3CBitCometPost%3E%3CQuery %3E%3Ctask%20hash%3D%22a0743038e91828fc15db5eec0b2923b1c1518032 %22%20size%3D%2239967818%22%20type%3D%22bt%22%3E%3C%2Ftask %3E%3C%2FQuery%3E%3C%2FBitCometPost%3E
This was from a download of a 39MB file (the size part) with an info_hash of a0743038e91828fc15db5eec0b2923b1c1518032<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<BitCometPost>
<Query>
<task hash="a0743038e91828fc15db5eec0b2923b1c1518032" size="39967818" type="bt">
</task>
</Query>
</BitCometPost>
When stored in bitcomets server logs with an IP, this ties you to every file you have downloaded from public or private trackers.
Tested with version 0.89 and 0.93, results are the same on both except Cookie is Client-Auth on 0.89
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