News · Altcoins
ZIP 259 schedules the NU7 network upgrade, slashing block target spacing to 25 seconds, introducing the Network Sustainability Mechanism, and invalidating legacy version 4 transactions.
Key point 1 of 3
01
ZIP 259 defines Zcash's NU7 upgrade, cutting block target spacing from 75 seconds to 25 seconds and removing 60% of transaction fees from circulation.
Key point 2 of 3
02
Version 4 transactions will be invalidated upon activation, permanently rendering any remaining funds in the legacy Sprout shielded pool unspendable.
Key point 3 of 3
03
Testnet activation is set at block height 4,465,026, while the Mainnet activation height and subsequent NSM reissuance block height remain pending.
Context
Community sentiment polling conducted in August and September 2026 shaped the NU7 scope, rejecting transaction-format shifts in favor of faster block times and the Network…
Why it matters
Exchanges, node operators, and custodial wallets must update client software to avoid following an unsupported branch, while users holding funds in the deprecated Sprout pool face…
What to watch
The assignment and publication of the Mainnet NU7 activation block height and its derived NSM reissuance height.
Sources
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