<p>Yes, according to <a href="http://www.reddit.com/r/Bitcoin/comments/2uuyzd/poll_should_the_maximum_block_size_be_increased/cocjhhe">Gavin Andresen via Reddit</a>.</p>

<p>Even if they didn't to do so, Bitcoin Core already has two other mechanisms which will produce automated alerts as the hard fork approaches: <a href="https://github.com/bitcoin/bitcoin/commit/dbca89b74b76610331d21656cd6747f5bf8375d6">one which will take effect</a> before the hard fork occurs, and <a href="https://github.com/bitcoin/bitcoin/commit/8fa9b5cc45c1826b00f305e91230c20df18885fa">one after</a> (as per <a href="https://github.com/bitcoin/bips/blob/master/bip-0050.mediawiki#safe-mode">BIP-50</a>).</p>

CC BY-SA 3.0
2015-05-04T22:24:24.760Z
Thanks for pointing those two out. I noticed that it seems to also disable some RPC commands in addition to showing a warning. https://github.com/bitcoin/bitcoin/blob/fc44231cb72afae2fffe0fac64e236a1d33b90e6/src/init.cpp#L243
Nick ODell
CC BY-SA 3.0
2015-05-04T22:30:17.170Z
Nice find, I didn't realize that!
Christopher Gurnee
CC BY-SA 3.0
2015-05-04T21:41:58.823Z
2015-05-04T21:41:58.823Z
Christopher Gurnee
<p>The <a href="http://gavinandresen.ninja/time-to-roll-out-bigger-blocks" rel="nofollow">block size increase proposal</a> currently under discussion would require all clients that process transactions to upgrade.</p>

<p>Otherwise, pre 0.11 clients would reject these larger blocks, leading to a possible double-spend attack against these merchants after Mar 1, 2016.</p>

<p>Will the Bitcoin developers use the alert system to warn these nodes to upgrade?</p>

<alert-system><block-size-increase><safemode>
Assuming that the block size fork goes through, will the Bitcoin developers use the alert key to tell people to upgrade?
Nick ODell
# Assuming that the block size fork goes through, will the Bitcoin developers use the alert key to tell people to upgrade?

(Asked by: username_0 on 2015-05-04)

The [block size increase proposal](http://gavinandresen.ninja/time-to-roll-out-bigger-blocks) currently under discussion would require all clients that process transactions to upgrade.

Otherwise, pre 0.11 clients would reject these larger blocks, leading to a possible double-spend attack against these merchants after Mar 1, 2016.

Will the Bitcoin developers use the alert system to warn these nodes to upgrade?

**Tags:** alert-system, block-size-increase, safemode


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## 1 answers

### Answer by username_1 on 2015-05-04. Score: 5 | Accepted answer

Yes, according to [Gavin Andresen via Reddit](http://www.reddit.com/r/Bitcoin/comments/2uuyzd/poll_should_the_maximum_block_size_be_increased/cocjhhe).

Even if they didn't to do so, Bitcoin Core already has two other mechanisms which will produce automated alerts as the hard fork approaches: [one which will take effect](https://github.com/bitcoin/bitcoin/commit/dbca89b74b76610331d21656cd6747f5bf8375d6) before the hard fork occurs, and [one after](https://github.com/bitcoin/bitcoin/commit/8fa9b5cc45c1826b00f305e91230c20df18885fa) (as per [BIP-50](https://github.com/bitcoin/bips/blob/master/bip-0050.mediawiki#safe-mode)).

> **Comments:**
> **username_0**: Thanks for pointing those two out. I noticed that it seems to also disable some RPC commands in addition to showing a warning. https://github.com/bitcoin/bitcoin/blob/fc44231cb72afae2fffe0fac64e236a1d33b90e6/src/init.cpp#L243  
> **username_1**: Nice find, I didn't realize that!  

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