And if candidate nodes already have hashcash installed (but not some custom software tool), answering a hashcash challenge can act as a sort of "you must be this tall to enter this ride" style check.

如果参与节点已经安装了hashcash(而不是一些定制的软件工具)，那么，对hashcash质询的回答就可以作为一种“必须达到某种高度才能登堂入室(you must be this tall to enter this ride)”风格的校验。

youdao

That is relevant because there are growing indications that the general may seek to enter politics as a presidential candidate against Mahinda Rajapaksa after quitting his military post.

BBC: Trouble at the top in Sri Lanka?

Writing in the Mail on Sunday, the MP - touted by some as a future leadership candidate - said the coalition "is about to enter the last chance saloon" and must consider a radical programme of tax cuts, including phasing out employers' national insurance contributions.

BBC: UK Politics

Another crucial question is whether any of the main Palestinian militant groups will enter the political process and field a presidential candidate in particular Hamas, whose popularity has risen as the PA's has slumped.

ECONOMIST: Can Palestinians go from bullets to ballots? | The