Measuring Zcash's NU7 hard fork from raw block headers
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Zcash activated its NU7 network upgrade on November 6, 2026, at block 3,543,405. Two changes got most of the attention. The target time between blocks dropped from 75 seconds to 25, and ZIP 2003 made nodes reject version 4 transactions. Version 4 is the only format that can spend from Sprout, Zcash's first shielded pool, so the roughly 12,224 ZEC still sitting there (per ZecStats, as reported by Cointelegraph and Decrypt) can no longer be moved. I wanted to check the block-time claim on the cha