Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ

I’m using Linux and I’m trying to avoid accidentally downloading the same files multiple times.

For example, I use Soulseek to download music. After a song finishes downloading, I usually move it to another folder (my main music library). Later on, when I’m searching again, I don’t always remember whether I already have a particular song, and I end up re-downloading it.

Is there a good way on Linux to keep track of what I’ve already downloaded, even after files are moved to different folders, so I can avoid downloading duplicates? Ideally, I’d like something that doesn’t require manually searching my entire music library every time.

One idea I had was leaving a placeholder file behind in the original download directory and configuring Soulseek not to overwrite it, but I’m not sure if Soulseek even has that option.

What tools or workflows would you recommend for this?