Zcash is a step closer to confirming a change that would speed payments on the privacy-focused blockchain by a factor of three after developers settled on the exact block at which the upgrade, known as NU7, would switch on. Zcash developer Sean Bowe filed a proposal on Tuesday to set activation at block 3,543,405, a height agreed at a meeting of Zcash Improvement Proposal (ZIP) editors, the group that signs off on changes to the blockchain’s rules.