Zcash NU7 upgrade activated, with about 12,200 ZEC temporarily unspendable

TechFlow reported on November 6 that, according to Cointelegraph, the Zcash NU7 network upgrade activated at block height 3,543,405, leaving about 12,224 ZEC in the legacy Sprout shielded pool unspendable under existing rules, worth approximately $15 million.

The upgrade rejects version 4 transactions, which are the only transaction format that supports spending Sprout funds. The report noted that these tokens have not been destroyed; a future network upgrade may restore access, but spending may never be re-enabled.

NU7 shortens the target block interval from 75 seconds to 25 seconds and introduces a network sustainability mechanism that removes 60% of transaction fees from circulation for future reissuance through mining rewards.

Source: TechFlow