The law requires the first HN comment to be negative. Here goes.

BitWall is on my radar because my long-term startup project is, indirectly, a competitor.

Paywalls are tricky because they only work for a handful of sites. My expectation is that they don't work for the long tail; but it's the long tail where almost every website lives. In practice, use of paywalls shapes up to be a niche business model.

So when you multiply one niche (paywalls) by another niche (bitcoin), I can only suspect that they will be in for a hard ride. Especially since nothing stops the other white-label paywall platforms from adding bitcoin to their currency roster.