Firo activated a hard fork at block 1,371,000, requiring node operators and wallet users to upgrade to version 0.14.18.0. The update patches an inflation flaw discovered in August in the private transaction protocol Spark, which could under certain conditions allow forged coins and inflate supply. A temporary fix had previously restricted Spark spending to a single input, weakening privacy. Existing funds, balances, addresses, and wallet keys remain valid with no migration required. Firo planned to publish a full technical disclosure and post-mortem after the fork activated.
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