That probably actually would be possible by emitting a negligible transaction from an address under one's control that has the SHA1 sum of the torrent encoded i

That probably actually would be possible by emitting a negligible transaction from an address under one's control that has the SHA1 sum of the torrent encoded inside the OP_RETURN. This would be sufficient to construct a bittorrent magnet link to download the post/data/whatever. The bitcoin address itself would act as the feed. This doesn't rely solely on bittorrent, but nevertheless that does seem like a workable, decentralized solution for publishing a bittorrent feed. Bitcoin solves another problem, thanks! Another neat side-effect of using a bitcoin address like that is that people could make donations to you through it :-)