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40 lines
1.6 KiB
HTML
40 lines
1.6 KiB
HTML
---
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title: "February 20, 2012 Protocol Changes"
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alias: "feb20"
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active: false
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banner: ""
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---
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<p>
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In June 2010 the Bitcoin reference software version 0.2.10 introduced
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a change to the protocol: the 'version' messages exchanged by nodes
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at connection time would have a new format that included checksum
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values to detect corruption by broken networks.
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</p><p>
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All other messages already carry a checksum (for connections between
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nodes 0.2.9 and later) but the version messages themselves could not
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be changed in a compatible way, so this change was delayed and did not take effect until
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<a href="http://www.timeanddate.com/worldclock/fixedtime.html?msg=Bitcoin+protocol+change&iso=20120220T00">midnight UTC on Feb 20th 2012</a>
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to leave users time to upgrade.
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</p><p>
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The developers of the Bitcoin reference software are unable to find
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any evidence of any nodes still running software prior to 0.2.10 on
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the network. If any nodes with software this old
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do still exist, they will no longer be able to connect to newer nodes.
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</p><p>
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This switchover has been tested and no significant disruption is
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expected and none has been observed so far.
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Nodes with incorrect clocks may have a difficult
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time making new connections for a brief period around the switchover
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time.
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</p><p>
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Please report any new connectivity issues to the <a
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href="http://webchat.freenode.net/?channels=bitcoin-dev&uio=d4">#bitcoin-dev
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channel</a> on Freenode IRC.
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</p><p>
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If there are unexpected difficulties this page will be updated with
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relevant information.
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</p>
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<div style="text-align:right">
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<i>This notice last updated: Mon, 20 Feb 2012 00:10:00 UTC</i>
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</div>
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