Zcash’s NU7 network upgrade was activated Friday at 02:34 UTC at block 3,543,405, setting a target block time of 25 seconds instead of 75 seconds. About 12,224 ZEC, valued at roughly $15 million, remain inaccessible in the legacy Sprout shielded pool because NU7 rejects version 4 transactions, the only format that supports spending those funds. The coins have not been burned, and a future upgrade could restore access, although the specification states that this ability may never be re-enabled. NU7 also introduces a Network Sustainability Mechanism that removes 60% of transaction fees from circulation for possible reissuance around 2031, while preserving Zcash’s 21 million ZEC supply cap and halving schedule.
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