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Mempool Policy Changes
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- Transactions with version number set to 3 are now treated as standard on all networks (#29496),
subject to Opt-in Topologically Restricted Until Confirmation (TRUC) Transactions policy as
described in [BIP 431](https://github.com/bitcoin/bips/blob/master/bip-0431.mediawiki). The
policy includes limits on spending unconfirmed outputs (#28948), eviction of a previous descendant
if a more incentive-compatible one is submitted (#29306), and a maximum transaction size of 10,000vB
(#29873). These restrictions simplify the assessment of incentive compatibility of accepting or
replacing TRUC transactions, thus ensuring any replacements are more profitable for the node and
making fee-bumping more reliable.
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