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From: El_Hoy <eloyesp@gmail.com>
Date: Mon, 5 Dec 2022 14:25:29 -0300
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To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Cc: Greg Sanders <gsanders87@gmail.com>
Subject: Re: [bitcoin-dev] Announcement: Full-RBF Miner Bounty
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You are doing quite big claims without explaining those, let me add a few
questions inline:

On Mon, Dec 5, 2022 at 10:39 AM Greg Sanders <gsanders87@gmail.com> wrote:

This will greatly centralize the network as well as not actually achieve
> the intended goal which is literally impossible.
>

Why would this centralize the network? Adding more nodes that propagate
valid blocks on the network should be good. Also, I cannot see why you say
it is "literally impossible", could you give any explanation for your words?

On Mon, Dec 5, 2022 at 11:53 AM Rijndael via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Good morning,
>
> That sounds like a very dangerous mode of operation. You can already hand
> a transaction to a miner privately. I hand a transaction to a miner with
> some reasonable fee, and then I go and broadcast a different transaction
> with a minimal fee that spends the same inputs. The whole network
> (including the miner I handed the tx to) could all be running with a strict
> first-seen mempool policy, but we can still have a situation where the
> miner creates a block with a different transaction from what you see in
> your mempool. If anytime this happens, the nodes running your proposed rule
> drop the block, then anyone can fork those nodes off the network whenever
> they want.
>
I cannot see the danger you are talking about, sending a transaction
directly to a miner does not sound like anyone can do (except a miner) and
is not the main workflow, usually transactions propagate on the network and
it is quite difficult to have different miners with different opt-out-rbb
transactions that spends the same input. In that strange scenario that you
mention, the miner generated block might be lost if another miner creates
an alternative block.

> Even outside of adversarial settings, Bitcoin doesn't (and doesn't attempt
> to) promise consistency across mempools. Making a consensus rule that
> enforces mempool consistency is a recipe for (unintended?) chainsplits.
>
That is not entirely true for opt-out rbf transactions, as most 0conf
setups are based on such consistency. And breaking a consensus rule always
leads to a chainsplit. For example when a miner creates a block that
double-spends an input, the normal bitcoin flow is a chain-split. That is
not an unintended chainsplit, is a consensus rule enforcement.

> - rijndael
>
>
> On 12/5/22 7:20 AM, El_Hoy via bitcoin-dev wrote:
>
> The only option I see against the attack Peter Todd is doing to opt-in RBF
> and 0Conf bitcoin usage is working on a bitcoin core implementation that
> stops propagation of full-rbf replaced blocks. Running multiple of such
> nodes on the network will add a risk to miners that enable full-rbf that
> would work as an incentive against that.
>
> Obviously that would require adding an option on bitcoin core (that is not
> technically but politically difficult to implement as Petter Todd already
> have commit access to the main repository).
>
> That said, a sufficiently incentivized actor (like Daniel Lipshitz or Muun
> wallet developers) could work on a fork and run several nodes with such
> functionality. As far as I understand the percolation model, with 10 to 20
> nodes running such a rule would create a significant risk for full-rbf
> miners.
>
> Regards.
>
> ---  Eloy
>
>
> On Tue, Nov 15, 2022 at 11:43 AM Peter Todd via bitcoin-dev <
> bitcoin-dev@lists.linuxfoundation.org> wrote:
>
>> On Tue, Nov 15, 2022 at 03:36:08PM +1000, Anthony Towns via bitcoin-dev
>> wrote:
>> > On Tue, Nov 08, 2022 at 01:16:13PM -0500, Peter Todd via bitcoin-dev
>> wrote:
>> > > FYI I've gotten a few hundred dollars worth of donations to this
>> effort, and
>> > > have raised the reward to about 0.02 BTC, or $400 USD at current
>> prices.
>> >
>> > Seems like this has been mostly claimed (0.014btc / $235, 9238sat/vb):
>>
>> I'm turning it back on when (if) the mempool settles down. I've got more
>> than
>> enough donations to give another run at it (the majority was donated
>> privately
>> FWIW). There's a risk of the mempool filling up again of course; hard to
>> avoid
>> that.
>>
>> Right now of course it's really easy to double spend with the obvious
>> low-fee/high-fee method as the min relay fee keeps shifting.
>>
>> >
>> https://mempool.space/tx/397dcbe4e95ec40616e3dfc4ff8ffa158d2e72020b7d11fc2be29d934d69138c
>> >
>> > The block it was claimed in seems to have been about an hour after the
>> > default mempool filled up:
>> >
>> > https://twitter.com/murchandamus/status/1592274621977477120
>> >
>> > That block actually seems to have included two
>> > alice.btc.calendar.opentimestamps.org txs, the other paying $7.88
>> > (309sat/vb):
>> >
>> >
>> https://mempool.space/tx/ba9670109a6551458d5e1e23600c7bf2dc094894abdf59fe7aa020ccfead07cf
>>
>> The second is because I turned down the full-rbf reward to more normal fee
>> levels. There's also another full-rbf double-spend from the Bob calendar,
>> along
>> the same lines:
>> 7e76b351009326a574f3120164dbbe6d85e07e04a7bbdc40f0277fcb008d2cd2
>>
>> I double-spent the txin of the high fee tx that got mined. But I
>> mistakenly had
>> RBF enabled in that double-spend, so while it propagated initially, I
>> believe
>> it was replaced when something (someone?) rebroadcast the high-fee 397dcb
>> tx.
>>
>> > Timeline (utc) to me looks like:
>> >
>> >  - 13:12 - block 763148 is mined: last one that had a min fee <
>> 1.5sat/vb
>> >  - 13:33 -
>> f503868c64d454c472859b793f3ee7cdc8f519c64f8b1748d8040cd8ce6dc6e1
>> >            is announced and propogates widely (1.2sat/vb)
>> >  - 18:42 -
>> 746daab9bcc331be313818658b4a502bb4f3370a691fd90015fabcd7759e0944
>> >            is announced and propogates widely (1.2sat/vb)
>> >  - 21:52 - ba967010 tx is announced and propogates widely, since
>> >            conflicting tx 746daab9 has been removed from default
>> >          mempools
>> >  - 21:53 - murch tweets about default mempool filling up
>> >  - 22:03 - 397dcbe4 tx is announced and propogates widely, since
>> >            conflicting tx f503868 has already been removed from default
>> >          mempools
>>
>> Is that 22:03 time for 397 from your node's logs? It was originally
>> announced
>> hours earlier. From one of my full-rbf nodes:
>>
>>     2022-11-14T14:08:37Z [mempool] replacing tx
>> 764867062b67fea61810c3858d587da83a28290545e882935a32285028084317 with
>> 397dcbe4e95ec40616e3dfc4ff8ffa158d2e72020b7d11fc2be29d934d69138c for
>> 0.00468 additional fees, -1 delta bytes
>>
>> >  - 22:35 - block 763189 is mined
>> >  - 22:39 - block 763190 is mined
>> >  - 23:11 - block 763191 is mined
>> >  - 23:17 - block 763192 is mined including 397dcbe4
>> >
>> > miningpool.observer reports both 397dcbe4 and ba967010 as missing in the
>> > first three blocks, and gives similar mempool ages for those txs to what
>> > my logs report:
>> >
>> >
>> https://miningpool.observer/template-and-block/0000000000000000000436aba59d8430061e0e50592215f7f263bfb1073ccac7
>> >
>> https://miningpool.observer/template-and-block/00000000000000000005600404792bacfd8a164d2fe9843766afb2bfbd937309
>> >
>> https://miningpool.observer/template-and-block/00000000000000000004a3073f58c9eae40f251ea7aeaeac870daeac4b238fd1
>> >
>> > That presumably means those pools (AntPool twice and "unknown") are
>> > running with large mempools that didn't kept the earlier 1.2sat/vb txs.
>>
>> To be clear, you think that AntPool and that other exchange is running
>> with a
>> larger than normal max mempool size limit? You mean those miners *did*
>> keep the
>> earlier 1.2sat/vb tx?
>>
>> > The txs were mined by Foundry:
>> >
>> >
>> https://miningpool.observer/template-and-block/00000000000000000001382a226aedac822de80309cca2bf1253b35d4f8144f5
>> >
>> > This seems to be pretty good evidence that we currently don't have any
>> > significant hashrate mining with fullrbf policies (<0.5% if there was a
>> > high fee replacement available prior to every block having been mined),
>> > despite the bounty having been collected.
>>
>> Oh, we can put much lower bounds on that. I've been running OTS calendars
>> with
>> full-rbf replacements for a few months without clear evidence of a
>> full-rbf
>> replacement.  While there was good reason to think some miners were mining
>> full-rbf before a few years back, they probably didn't bother to reapply
>> their
>> patches each upgrade. `mempoolfullrbf=1` is much simpler to use.
>>
>> --
>> https://petertodd.org 'peter'[:-1]@petertodd.org
>> _______________________________________________
>> bitcoin-dev mailing list
>> bitcoin-dev@lists.linuxfoundation.org
>> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>>
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>

--000000000000fe5e8a05ef17f9bb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>You are doing quite big claims without explaining tho=
se, let me add a few questions inline:</div><div><br></div><div><div dir=3D=
"ltr" class=3D"gmail_attr">On Mon, Dec 5, 2022 at 10:39 AM Greg Sanders &lt=
;<a href=3D"mailto:gsanders87@gmail.com">gsanders87@gmail.com</a>&gt; wrote=
:</div><div dir=3D"ltr" class=3D"gmail_attr"><br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex"><div dir=3D"auto">This will greatly centraliz=
e the network as well as not actually achieve the intended goal which is li=
terally impossible. <br></div></blockquote></div><div><br></div><div>Why wo=
uld this centralize the network? Adding more nodes that propagate valid blo=
cks on the network should be good. Also, I cannot see why you say it is &qu=
ot;literally impossible&quot;, could you give any explanation for your word=
s?</div><div><br></div><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D=
"gmail_attr">On Mon, Dec 5, 2022 at 11:53 AM Rijndael via bitcoin-dev &lt;<=
a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org">bitcoin-dev@lists.l=
inuxfoundation.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);=
padding-left:1ex">
   =20
 =20
  <div>
    <p>Good morning,<br>
    </p>
    <p>That sounds like a very dangerous mode of operation. You can
      already hand a transaction to a miner privately. I hand a
      transaction to a miner with some reasonable fee, and then I go and
      broadcast a different transaction with a minimal fee that spends
      the same inputs. The whole network (including the miner I handed
      the tx to) could all be running with a strict first-seen mempool
      policy, but we can still have a situation where the miner creates
      a block with a different transaction from what you see in your
      mempool. If anytime this happens, the nodes running your proposed
      rule drop the block, then anyone can fork those nodes off the
      network whenever they want.</p></div></blockquote><div>I cannot see t=
he danger you are talking about, sending a transaction directly to a miner =
does not sound like anyone can do (except a miner) and is not the main work=
flow, usually transactions propagate on the network and it is quite difficu=
lt to have different miners with different opt-out-rbb transactions that sp=
ends the same input. In that strange scenario that you mention, the miner g=
enerated block might be lost if another miner creates an alternative block.=
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><p>
    </p>
    <p>Even outside of adversarial settings, Bitcoin doesn&#39;t (and
      doesn&#39;t attempt to) promise consistency across mempools. Making a
      consensus rule that enforces mempool consistency is a recipe for
      (unintended?) chainsplits.<br></p></div></blockquote><div>That is not=
 entirely true for opt-out rbf transactions, as most 0conf setups are based=
 on such consistency. And breaking a consensus rule always leads to a chain=
split. For example when a miner creates a block that double-spends an input=
, the normal bitcoin flow is a chain-split. That is not an unintended chain=
split, is a consensus rule enforcement.<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex"><div><p>
    </p>
    <p>- rijndael<br>
    </p>
    <p><br>
    </p>
    <div>On 12/5/22 7:20 AM, El_Hoy via
      bitcoin-dev wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      <div dir=3D"ltr">
        <div>The only option I see against the attack Peter Todd is
          doing to opt-in RBF and 0Conf bitcoin usage is working on a
          bitcoin core implementation that stops propagation of full-rbf
          replaced blocks. Running multiple of such nodes on the network
          will add a risk to miners that enable full-rbf that would work
          as an incentive against that.</div>
        <div><br>
        </div>
        <div>Obviously that would require adding an option on bitcoin
          core (that is not technically but politically difficult to
          implement as Petter Todd already have commit access to the
          main repository).</div>
        <div><br>
        </div>
        <div>That said, a sufficiently incentivized actor (like Daniel
          Lipshitz or Muun wallet developers) could work on a fork and
          run several nodes with such functionality. As far as I
          understand the percolation model, with 10 to 20 nodes running
          such a rule would create a significant risk for full-rbf
          miners.</div>
        <div><br>
        </div>
        <div>Regards.<br>
        </div>
        <div><br>
        </div>
        <div>
          <div dir=3D"ltr">
            <div dir=3D"ltr"><span style=3D"color:rgb(56,118,29)"><span sty=
le=3D"font-family:arial,helvetica,sans-serif">---=C2=A0
                  Eloy</span></span><br>
            </div>
          </div>
        </div>
        <br>
      </div>
      <br>
      <div class=3D"gmail_quote">
        <div dir=3D"ltr" class=3D"gmail_attr">On Tue, Nov 15, 2022 at 11:43
          AM Peter Todd via bitcoin-dev &lt;<a href=3D"mailto:bitcoin-dev@l=
ists.linuxfoundation.org" target=3D"_blank">bitcoin-dev@lists.linuxfoundati=
on.org</a>&gt;
          wrote:<br>
        </div>
        <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex">On
          Tue, Nov 15, 2022 at 03:36:08PM +1000, Anthony Towns via
          bitcoin-dev wrote:<br>
          &gt; On Tue, Nov 08, 2022 at 01:16:13PM -0500, Peter Todd via
          bitcoin-dev wrote:<br>
          &gt; &gt; FYI I&#39;ve gotten a few hundred dollars worth of
          donations to this effort, and<br>
          &gt; &gt; have raised the reward to about 0.02 BTC, or $400
          USD at current prices.<br>
          &gt; <br>
          &gt; Seems like this has been mostly claimed (0.014btc / $235,
          9238sat/vb):<br>
          <br>
          I&#39;m turning it back on when (if) the mempool settles down.
          I&#39;ve got more than<br>
          enough donations to give another run at it (the majority was
          donated privately<br>
          FWIW). There&#39;s a risk of the mempool filling up again of
          course; hard to avoid<br>
          that.<br>
          <br>
          Right now of course it&#39;s really easy to double spend with the
          obvious<br>
          low-fee/high-fee method as the min relay fee keeps shifting.<br>
          <br>
          &gt; <a href=3D"https://mempool.space/tx/397dcbe4e95ec40616e3dfc4=
ff8ffa158d2e72020b7d11fc2be29d934d69138c" rel=3D"noreferrer" target=3D"_bla=
nk">https://mempool.space/tx/397dcbe4e95ec40616e3dfc4ff8ffa158d2e72020b7d11=
fc2be29d934d69138c</a><br>
          &gt; <br>
          &gt; The block it was claimed in seems to have been about an
          hour after the<br>
          &gt; default mempool filled up:<br>
          &gt; <br>
          &gt; <a href=3D"https://twitter.com/murchandamus/status/159227462=
1977477120" rel=3D"noreferrer" target=3D"_blank">https://twitter.com/murcha=
ndamus/status/1592274621977477120</a><br>
          &gt; <br>
          &gt; That block actually seems to have included two<br>
          &gt; <a href=3D"http://alice.btc.calendar.opentimestamps.org" rel=
=3D"noreferrer" target=3D"_blank">alice.btc.calendar.opentimestamps.org</a>
          txs, the other paying $7.88<br>
          &gt; (309sat/vb):<br>
          &gt; <br>
          &gt; <a href=3D"https://mempool.space/tx/ba9670109a6551458d5e1e23=
600c7bf2dc094894abdf59fe7aa020ccfead07cf" rel=3D"noreferrer" target=3D"_bla=
nk">https://mempool.space/tx/ba9670109a6551458d5e1e23600c7bf2dc094894abdf59=
fe7aa020ccfead07cf</a><br>
          <br>
          The second is because I turned down the full-rbf reward to
          more normal fee<br>
          levels. There&#39;s also another full-rbf double-spend from the
          Bob calendar, along<br>
          the same lines:
          7e76b351009326a574f3120164dbbe6d85e07e04a7bbdc40f0277fcb008d2cd2<=
br>
          <br>
          I double-spent the txin of the high fee tx that got mined. But
          I mistakenly had<br>
          RBF enabled in that double-spend, so while it propagated
          initially, I believe<br>
          it was replaced when something (someone?) rebroadcast the
          high-fee 397dcb tx.<br>
          <br>
          &gt; Timeline (utc) to me looks like:<br>
          &gt; <br>
          &gt;=C2=A0 - 13:12 - block 763148 is mined: last one that had a m=
in
          fee &lt; 1.5sat/vb<br>
          &gt;=C2=A0 - 13:33 -
          f503868c64d454c472859b793f3ee7cdc8f519c64f8b1748d8040cd8ce6dc6e1<=
br>
          &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 is announced and pr=
opogates widely (1.2sat/vb)<br>
          &gt;=C2=A0 - 18:42 -
          746daab9bcc331be313818658b4a502bb4f3370a691fd90015fabcd7759e0944<=
br>
          &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 is announced and pr=
opogates widely (1.2sat/vb)<br>
          &gt;=C2=A0 - 21:52 - ba967010 tx is announced and propogates
          widely, since<br>
          &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 conflicting tx 746d=
aab9 has been removed from
          default<br>
          &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 mempools<br>
          &gt;=C2=A0 - 21:53 - murch tweets about default mempool filling u=
p<br>
          &gt;=C2=A0 - 22:03 - 397dcbe4 tx is announced and propogates
          widely, since<br>
          &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 conflicting tx f503=
868 has already been
          removed from default<br>
          &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 mempools<br>
          <br>
          Is that 22:03 time for 397 from your node&#39;s logs? It was
          originally announced<br>
          hours earlier. From one of my full-rbf nodes:<br>
          <br>
          =C2=A0 =C2=A0 2022-11-14T14:08:37Z [mempool] replacing tx
          764867062b67fea61810c3858d587da83a28290545e882935a32285028084317
          with
          397dcbe4e95ec40616e3dfc4ff8ffa158d2e72020b7d11fc2be29d934d69138c
          for 0.00468 additional fees, -1 delta bytes<br>
          <br>
          &gt;=C2=A0 - 22:35 - block 763189 is mined<br>
          &gt;=C2=A0 - 22:39 - block 763190 is mined<br>
          &gt;=C2=A0 - 23:11 - block 763191 is mined<br>
          &gt;=C2=A0 - 23:17 - block 763192 is mined including 397dcbe4<br>
          &gt; <br>
          &gt; miningpool.observer reports both 397dcbe4 and ba967010 as
          missing in the<br>
          &gt; first three blocks, and gives similar mempool ages for
          those txs to what<br>
          &gt; my logs report:<br>
          &gt; <br>
          &gt;=C2=A0 =C2=A0<a href=3D"https://miningpool.observer/template-=
and-block/0000000000000000000436aba59d8430061e0e50592215f7f263bfb1073ccac7"=
 rel=3D"noreferrer" target=3D"_blank">https://miningpool.observer/template-=
and-block/0000000000000000000436aba59d8430061e0e50592215f7f263bfb1073ccac7<=
/a><br>
          &gt;=C2=A0 =C2=A0<a href=3D"https://miningpool.observer/template-=
and-block/00000000000000000005600404792bacfd8a164d2fe9843766afb2bfbd937309"=
 rel=3D"noreferrer" target=3D"_blank">https://miningpool.observer/template-=
and-block/00000000000000000005600404792bacfd8a164d2fe9843766afb2bfbd937309<=
/a><br>
          &gt;=C2=A0 =C2=A0<a href=3D"https://miningpool.observer/template-=
and-block/00000000000000000004a3073f58c9eae40f251ea7aeaeac870daeac4b238fd1"=
 rel=3D"noreferrer" target=3D"_blank">https://miningpool.observer/template-=
and-block/00000000000000000004a3073f58c9eae40f251ea7aeaeac870daeac4b238fd1<=
/a><br>
          &gt; <br>
          &gt; That presumably means those pools (AntPool twice and
          &quot;unknown&quot;) are<br>
          &gt; running with large mempools that didn&#39;t kept the earlier
          1.2sat/vb txs.<br>
          <br>
          To be clear, you think that AntPool and that other exchange is
          running with a<br>
          larger than normal max mempool size limit? You mean those
          miners *did* keep the<br>
          earlier 1.2sat/vb tx?<br>
          <br>
          &gt; The txs were mined by Foundry:<br>
          &gt; <br>
          &gt;=C2=A0 =C2=A0<a href=3D"https://miningpool.observer/template-=
and-block/00000000000000000001382a226aedac822de80309cca2bf1253b35d4f8144f5"=
 rel=3D"noreferrer" target=3D"_blank">https://miningpool.observer/template-=
and-block/00000000000000000001382a226aedac822de80309cca2bf1253b35d4f8144f5<=
/a><br>
          &gt; <br>
          &gt; This seems to be pretty good evidence that we currently
          don&#39;t have any<br>
          &gt; significant hashrate mining with fullrbf policies
          (&lt;0.5% if there was a<br>
          &gt; high fee replacement available prior to every block
          having been mined),<br>
          &gt; despite the bounty having been collected.<br>
          <br>
          Oh, we can put much lower bounds on that. I&#39;ve been running
          OTS calendars with<br>
          full-rbf replacements for a few months without clear evidence
          of a full-rbf<br>
          replacement.=C2=A0 While there was good reason to think some mine=
rs
          were mining<br>
          full-rbf before a few years back, they probably didn&#39;t bother
          to reapply their<br>
          patches each upgrade. `mempoolfullrbf=3D1` is much simpler to
          use.<br>
          <br>
          -- <br>
          <a href=3D"https://petertodd.org" rel=3D"noreferrer" target=3D"_b=
lank">https://petertodd.org</a>
          &#39;peter&#39;[:-1]@<a href=3D"http://petertodd.org" rel=3D"nore=
ferrer" target=3D"_blank">petertodd.org</a><br>
          _______________________________________________<br>
          bitcoin-dev mailing list<br>
          <a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=
=3D"_blank">bitcoin-dev@lists.linuxfoundation.org</a><br>
          <a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bit=
coin-dev" rel=3D"noreferrer" target=3D"_blank">https://lists.linuxfoundatio=
n.org/mailman/listinfo/bitcoin-dev</a><br>
        </blockquote>
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