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Introduce some policy constants from Bitcoin Core #584

Merged
merged 3 commits into from May 29, 2021
Merged

Introduce some policy constants from Bitcoin Core #584

merged 3 commits into from May 29, 2021

Commits on May 18, 2021

  1. policy: introduce p2p constants from the reference implementation 

    This introduces some constants defined by Bitcoin Core which as a
consequence define some network rules in a new 'policy' module.

Only some were picked, which are very unlikely to change. Nonetheless a
Warning has been put in the module documentation.

Script-level constants are left into rust-miniscript where they are
already defined (src/miniscript/limits.rs).
    @darosior
    darosior committed May 18, 2021
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  2. blockdata/script: use policy's constant in dust computation 

    Signed-off-by: Antoine Poinsot <darosior@protonmail.com>
    @darosior
    darosior committed May 18, 2021
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  3. policy: add a function to get the virtual transaction size 

    It's very useful to Bitcoin applications, and especially "L2" ones, to
effectively compute feerates. Currently (and this is very unlikely to
change) bitcoind nodes compute the virtual size as a rounded-up division
of the size in witness units by 4, with a penalty for transactions that
are essentially >5% full of sigops.

Signed-off-by: Antoine Poinsot <darosior@protonmail.com>
    @darosior
    darosior committed May 18, 2021
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