Explain xkcd: It's 'cause you're dumb.
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Just above the "footnote", at the bottom of the xkcd, is tiny print reading:


The later portion (bitcoin address) also used to appear at xkcd.com/bitcoin/. "BTC" is the abbreviation for bitcoin.

This is apparently xkcd's bitcoin address, perhaps the high-tech equivalent of a tip-jar. Details about this can be seen in several places.

xkcd.com/bitcoin/ has since changed to 14Tr4HaKkKuC1Lmpr2YMAuYVZRWqAdRTcr and is currently a 404. This second BTC address may belong to xkcd[citation needed]. Until confirmed, do not donate, as it may be that the page has been maliciously modified as the footnote has not been changed. Before those two addresses, it used to say 1Lg2rvxbBPC8jp2YJoV5xL7sdyTjueMUot.