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@ -656,7 +656,7 @@ check whether the policy has changed since publication of this book.
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====
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Since Bitcoin's inception, every full node has needed to keep a copy of
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every unspent transaction output (UTXO), but that might not always be
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the case. Several developers have been working on Utreexo, a project
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the case. Several developers have been working on((("Utreexo"))) Utreexo, a project
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that allows full nodes to store a commitment to the set of UTXOs rather
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than the data itself. A minimal commitment might be only a kilobyte or
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two in size--compare that to the over five gigabytes Bitcoin Core stores
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