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The proposal sets Mainnet activation at block 3,543,405, cuts block times to 25 seconds, removes 60% of transaction fees, and invalidates Sprout transfers.
Key point 1 of 3
01
ZIP 259 defines Zcash NU7 deployment at Mainnet block 3,543,405 and Testnet block 4,465,026 .
Key point 2 of 3
02
Block target spacing drops from 75 to 25 seconds, while 60% of transaction fees will be burned out of circulation .
Key point 3 of 3
03
Version 4 transactions are permanently disabled, rendering remaining legacy Sprout shielded funds unspendable .
Context
ZIP 259 formalizes consensus adjustments following August and September 2026 community polls covering block times and issuance preservation.
Why it matters
Node operators, miners, and custody providers must update node software to protocol version 170190, while Sprout pool holders must migrate funds before activation.
What to watch
Mainnet activation at block 3,543,405 and subsequent NSM reissuance start at block 8,939,664.
Sources
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