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release-notes: Significantly rewrite priority transactions section

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Gregory Maxwell 2016-02-09 22:46:00 +00:00 committed by Luke Dashjr
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@ -168,27 +168,33 @@ three bytes overhead)
Relay and Mining: Priority transactions Relay and Mining: Priority transactions
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Transactions that do not pay the minimum relay fee, are called "free Bitcoin Core has a heuristic 'priority' based on coin value and age for
transactions" or priority transactions. Bitcoin Core relays and mines transactions which do not meet pay the minimum relay fee. Bitcoin Core relays
priority transactions depending on the setting of `-limitfreerelay=<r>` and mines these transactions depending on the setting of `-limitfreerelay=<r>`
(default: `r=15` kB per minute) and `-blockprioritysize=<s>`. (default: `r=15` kB per minute) and `-blockprioritysize=<s>`.
In Bitcoin Core 0.12, priority transactions are not accepted to the mempool nor In Bitcoin Core 0.12 when mempool limit has been reached a higher minimum relay
relayed if mempool limiting has triggered a higher effective minimum relay fee. fee takes effect to limit memory usage. Transactions which do not meet this
higher effective minimum relay fee will not be relayed or mined even if they
would rank highly according to the priority heuristic if they were accepted.
Mining of priority transactions is also now disabled by default. To re-enable In Bitcoin Core 0.12 the reserved space for priority heuristic selected
it, simply set `-blockprioritysize=<n>` where <n> is the size in bytes of your transactions is also set to zero.
blocks to reserve for priority transactions. The old default was 50k, so to
retain the same policy, you must set `-blockprioritysize=50000`.
Additionally, calculation of the priority for transactions received with To re-enable it, simply set `-blockprioritysize=<n>` where is the size in bytes
unconfirmed inputs is no longer updated accurately based on those inputs. of your blocks to reserve for these transactions. The old default was 50k, so
to retain the same policy, you would set `-blockprioritysize=50000`.
Additionally, as a result of computational simplifications, the priority value
used for transactions received with unconfirmed inputs is lower than in prior
versions to due avoiding recomputing the amounts as transactions confirm.
External miner policy set via the prioritisetransaction RPC to rank
transactions already in the mempool continues to work as it has previously.
This internal automatic prioritization handling is being considered for removal This internal automatic prioritization handling is being considered for removal
entirely in Bitcoin Core 0.13, and it is at this time undecided whether the entirely in Bitcoin Core 0.13. Community direction on this topic is
inaccurate priority calculation will be fixed or left as-is in future releases. particularly requested to help set project priorities.
Community direction on this topic is particularly requested to help set project
priorities.
Automatically use Tor hidden services Automatically use Tor hidden services
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