Inside Bitcoin
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Inside Bitcoin
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The code behind the network, with room to understand it.
Release published 2026-10-28 · Snapshot fetched 2026-11-01. Latest stable release at fetch time; development branches and Git history are excluded. Only the selected code window and visible folders load here.
751<string>Warning: Fee estimation is currently not possible.</string>752</property>753<property name="wordWrap">754<bool>false</bool>755</property>756</widget>757</item>758<item>759<spacer name="horizontalSpacer_4">760<property name="orientation">761<enum>Qt::Horizontal</enum>762</property>763<property name="sizeType">764<enum>QSizePolicy::MinimumExpanding</enum>765</property>766<property name="sizeHint" stdset="0">767<size>768<width>40</width>769<height>20</height>770</size>771</property>772</spacer>773</item>774<item>775<widget class="QPushButton" name="buttonMinimizeFee">776<property name="toolTip">777<string>Hide transaction fee settings</string>778</property>779<property name="text">780<string>Hide</string>781</property>782</widget>783</item>784</layout>785</item>786<item>787<widget class="QFrame" name="frameFeeSelection">788<layout class="QVBoxLayout" name="verticalLayoutFee12">789<property name="spacing">790<number>0</number>791</property>792<property name="leftMargin">793<number>0</number>794</property>795<property name="topMargin">796<number>0</number>797</property>798<property name="rightMargin">799<number>0</number>800</property>801<property name="bottomMargin">802<number>0</number>803</property>804<item>805<layout class="QGridLayout" name="gridLayoutFee">806<property name="topMargin">807<number>10</number>808</property>809<property name="bottomMargin">810<number>4</number>811</property>812<property name="horizontalSpacing">813<number>10</number>814</property>815<property name="verticalSpacing">816<number>4</number>817</property>818<item row="1" column="1">819<layout class="QVBoxLayout" name="verticalLayoutFee8">820<property name="spacing">821<number>6</number>822</property>823<item>824<layout class="QHBoxLayout" name="horizontalLayoutFee13">825<item>826<widget class="QLabel" name="labelCustomPerKilobyte">827<property name="toolTip">828<string>Specify a custom fee per kB (1,000 bytes) of the transaction's virtual size.830Note: Since the fee is calculated on a per-byte basis, a fee rate of "100 satoshis per kvB" for a transaction size of 500 virtual bytes (half of 1 kvB) would ultimately yield a fee of only 50 satoshis.</string>831</property>832<property name="text">833<string>per kilobyte</string>834</property>835</widget>836</item>837<item>838<widget class="BitcoinAmountField" name="customFee"/>839</item>840<item>841<spacer name="horizontalSpacer_6">842<property name="orientation">843<enum>Qt::Horizontal</enum>844</property>845<property name="sizeHint" stdset="0">846<size>847<width>1</width>848<height>1</height>849</size>850</property>851</spacer>852</item>853</layout>854</item>855<item>856<layout class="QHBoxLayout" name="horizontalLayoutFee8">857<item>858<widget class="QLabel" name="labelCustomFeeWarning">859<property name="enabled">860<bool>true</bool>861</property>862<property name="toolTip">863<string>When there is less transaction volume than space in the blocks, miners as well as relaying nodes may enforce a minimum fee. Paying only this minimum fee is just fine, but be aware that this can result in a never confirming transaction once there is more demand for bitcoin transactions than the network can process.</string>864</property>865<property name="text">866<string>A too low fee might result in a never confirming transaction (read the tooltip)</string>867</property>868</widget>869</item>870<item>871<spacer name="horizontalSpacer_2">872<property name="orientation">873<enum>Qt::Horizontal</enum>874</property>875<property name="sizeHint" stdset="0">876<size>877<width>1</width>878<height>1</height>879</size>880</property>881</spacer>882</item>883</layout>884</item>885</layout>886</item>887<item row="0" column="0">888<layout class="QVBoxLayout" name="verticalLayoutFee4" stretch="0,1">889<item>890<widget class="QRadioButton" name="radioSmartFee">891<property name="text">892<string>Recommended:</string>893</property>894<property name="checked">895<bool>true</bool>896</property>897<attribute name="buttonGroup">898<string notr="true">groupFee</string>899</attribute>900</widget>901</item>902<item>903<spacer name="verticalSpacer_2">904<property name="orientation">905<enum>Qt::Vertical</enum>906</property>907<property name="sizeHint" stdset="0">908<size>909<width>1</width>910<height>1</height>911</size>912</property>913</spacer>914</item>915</layout>916</item>917<item row="1" column="0">918<layout class="QVBoxLayout" name="verticalLayoutFee9" stretch="0,1">919<item>920<widget class="QRadioButton" name="radioCustomFee">921<property name="text">922<string>Custom:</string>923</property>924<attribute name="buttonGroup">925<string notr="true">groupFee</string>926</attribute>927</widget>928</item>929<item>930<spacer name="verticalSpacer_6">931<property name="orientation">932<enum>Qt::Vertical</enum>933</property>934<property name="sizeHint" stdset="0">935<size>936<width>1</width>937<height>1</height>938</size>939</property>940</spacer>941</item>942</layout>943</item>944<item row="0" column="1">945<layout class="QVBoxLayout" name="verticalLayoutFee3" stretch="0,0,1">946<property name="spacing">947<number>6</number>948</property>949<property name="topMargin">950<number>2</number>951</property>952<item>953<layout class="QHBoxLayout" name="horizontalLayoutFee12">954<item>955<widget class="QLabel" name="labelSmartFee">956<property name="text">957<string/>958</property>959</widget>960</item>961<item>962<widget class="QLabel" name="labelFeeEstimation">963<property name="text">964<string/>965</property>966</widget>967</item>968<item>969<widget class="QLabel" name="labelSmartFee2">970<property name="text">971<string>(Smart fee not initialized yet. This usually takes a few blocks…)</string>972</property>973</widget>974</item>975<item>976<spacer name="horizontalSpacer_5">977<property name="orientation">978<enum>Qt::Horizontal</enum>979</property>980<property name="sizeHint" stdset="0">981<size>982<width>1</width>983<height>1</height>984</size>985</property>986</spacer>987</item>988</layout>989</item>990<item>991<layout class="QHBoxLayout" name="horizontalLayoutFee9">992<item>993<layout class="QVBoxLayout" name="verticalLayoutFee6">994<item>995<widget class="QLabel" name="labelSmartFee3">996<property name="text">997<string>Confirmation time target:</string>998</property>999</widget>1000</item>
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