protocol
Zcash patches Orchard soundness bug with NU6.2 emergency hard fork
An under-constrained Orchard circuit could have minted undetectable counterfeit ZEC. Zcash froze the pool with a June 2 soft fork, then re-enabled it via NU6.2 the next day.
Stories tagged: #security
protocol
Zcash Zebra 4.5.0 patches P2SH sigop bug that risked chain split
Zcash Foundation ships Zebra 4.5.0 plus a 4.5.1 hotfix, closing 15 advisories including a critical P2SH disabled-opcode sigop undercount that could split the chain.