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Subject: Re: [bitcoindev] The Future of Bitcoin Testnet
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> Is the difficulty reset bug actually a bug, or a feature?

Both. It is a bug, because it makes things unstable. However, it is also a 
feature, because it allows us to quickly reach a lot of halvings, and test 
a situation, where basic block reward is small, and where getting new coins 
is very difficult, because you have to get them from the current owners.

> If it's a bug, couldn't we just fix it and let the blockchain reorg on 
its own?

But there is no need to "reorg" things. If you have 1,5 M blocks, then it 
is not a problem, that in 2015, there was a blockstorm somewhere. The only 
problem is if you create some transaction, and see that kind of blockstorm 
here and now, when you put some timelock on your transaction, or when 100 
confirmations are not enough, because it is covered with a very little 
Proof of Work, and was mined in a minute.

Which also means, that fixing previous blockstorms is not that important. 
Fixing the current ones is more urgent, because if you would see, that 
since for example block 1,8 M, there will be no blockstorms, then that 
network will become stable.

The only "fix" into previous blockstorms, could be related to the amounts, 
which were mined during those blockstorms. But then, it is all about 
"demurrage", or any other penalty, and it does not require erasing past 
blocks from the history. Those blocks could still be present in the chain 
of previous block hashes inside block headers. The only question is about 
throwing away coins from the UTXO set, or turning them into fees for the 
future blocks. But there is no need to overwrite the history to fix things.

> Signet is definitely not a replacement for testnet.

I wonder, what people think about merging signet and testnet into a single 
chain? For example: imagine if signet would be entirely stored on testnet3, 
but just some blocks would be signed with that "signet challenge", some 
would be signed with another, and some would be not signed at all. Then, 
you could scan the whole testnet3, pick some "signet challenge", and your 
UTXO set would contain only coins from the test network, which you want to 
observe. And then, everyone could do some "network reset", just by 
switching the signet challenge, and rebuilding the database.

Another interesting model, is making a network, where mainnet and testnet 
blocks are visible in the same timeline. Then, to make some new test coins, 
you would just sign some mainnet coins. And to destroy them, you just burn 
them, or move them in the main network in any way, so they are no longer 
pegged, and are skipped during Initial Blockchain Download in the test 
network.

> If we fix the difficulty reset bug, we might as well also fix the coin 
supply issue: get rid of the halving for testnet and just make every block 
create new coins.

To solve the problem of getting the new test coins, people would need to 
realize the truth: testnet coins are supposed to be worthless. Which means, 
that performing all tests with zero satoshis should be fine, right? So, why 
those non-zero amounts are needed? Of course as a protection from spam. 
Which also means, that if someone has no coins, then we could allow 
including a transaction, if it provides some Proof of Work instead, right?

Because if you have 0.01 tBTC, then what does it mean? It is not something, 
which should be converted into BTC. It is worthless. However, it is used to 
express "data pushing ability". It simply means, that if your transaction 
fee is 1 sat/vB, then you can push 1 MB publicly, and reveal your test 
cases, so other users can see them. But if instead of including transaction 
fee, users would share some Proof of Work, then the protocol could allow 
them to include their tests for free (or just cheaper than usual), because 
they did some work, so we could reward them accordingly to the hashes they 
found.

By the way, even if we run out of coins, then there are still cases, where 
producing new blocks with zero reward makes sense, because it affects 
locktimes, the difficulty, and the whole Script is still followed to the 
letter, so all kinds of contracts are still executed (and for example 
timestamping a document in some Proof of Work chain may be worthy, even if 
the miner didn't earn any new coins by doing so). Another use case is 
unlocking some previously mined coinbase transaction, because even a new 
block with no reward, still counts as an additional confirmation.

sunday, 31 march 2024 at 18:24:37 UTC+2 Luke Dashjr wrote:

Is the difficulty reset bug actually a bug, or a feature?

If it's a bug, couldn't we just fix it and let the blockchain reorg on its 
own?

Signet is definitely not a replacement for testnet.

Luke


On 3/31/24 09:19, Jameson Lopp wrote:

Hi all, 

I'd like to open a discussion about testnet3 to put out some feelers on 
potential changes to it. First, a few facts:

1. Testnet3 has been running for 13 years. It's on block 2.5 million 
something and the block reward is down to ~0.014 TBTC, so mining is not 
doing a great job at distributing testnet coins any more.

2. The reason the block height is insanely high is due to a rather amusing 
edge case bug that causes the difficulty to regularly get reset to 1, which 
causes a bit of havoc. If you want a deep dive into the quirk: 
https://blog.lopp.net/the-block-storms-of-bitcoins-testnet/

3. Testnet3 is being actively used for scammy airdrops; those of us who 
tend to be generous with our testnet coins are getting hounded by 
non-developers chasing cheap gains.

4. As a result, TBTC is being actively bought and sold; one could argue 
that the fundamental principle of testnet coins having no value has been 
broken.

This leads me to ponder the following questions, for which I'm soliciting 
feedback.

1. Should we plan for a reset of testnet? If so, given how long it has been 
since the last reset and how many production systems will need to be 
updated, would a reset need to be done with a great deal of notice?

2. Is there interest in fixing the difficulty reset bug? It should be a one 
liner fix, and I'd argue it could be done sooner rather than later, and 
orthogonal to the network reset question. Would such a change, which would 
technically be a hard fork (but also arguably a self resolving fork due to 
the difficulty dynamics) necessitate a BIP or could we just YOLO it?

3. Is all of the above a waste of time and we should instead deprecate 
testnet in favor of signet?

- Jameson

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------=_Part_4811_1735188972.1712687282627
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

&gt; Is the difficulty reset bug actually a bug, or a feature?<br /><br />B=
oth. It is a bug, because it makes things unstable. However, it is also a f=
eature, because it allows us to quickly reach a lot of halvings, and test a=
 situation, where basic block reward is small, and where getting new coins =
is very difficult, because you have to get them from the current owners.<br=
 /><br />&gt; If it's a bug, couldn't we just fix it and let the blockchain=
 reorg on its own?<br /><br />But there is no need to "reorg" things. If yo=
u have 1,5 M blocks, then it is not a problem, that in 2015, there was a bl=
ockstorm somewhere. The only problem is if you create some transaction, and=
 see that kind of blockstorm here and now, when you put some timelock on yo=
ur transaction, or when 100 confirmations are not enough, because it is cov=
ered with a very little Proof of Work, and was mined in a minute.<br /><br =
/>Which also means, that fixing previous blockstorms is not that important.=
 Fixing the current ones is more urgent, because if you would see, that sin=
ce for example block 1,8 M, there will be no blockstorms, then that network=
 will become stable.<br /><br />The only "fix" into previous blockstorms, c=
ould be related to the amounts, which were mined during those blockstorms. =
But then, it is all about "demurrage", or any other penalty, and it does no=
t require erasing past blocks from the history. Those blocks could still be=
 present in the chain of previous block hashes inside block headers. The on=
ly question is about throwing away coins from the UTXO set, or turning them=
 into fees for the future blocks. But there is no need to overwrite the his=
tory to fix things.<br /><br />&gt; Signet is definitely not a replacement =
for testnet.<br /><br />I wonder, what people think about merging signet an=
d testnet into a single chain? For example: imagine if signet would be enti=
rely stored on testnet3, but just some blocks would be signed with that "si=
gnet challenge", some would be signed with another, and some would be not s=
igned at all. Then, you could scan the whole testnet3, pick some "signet ch=
allenge", and your UTXO set would contain only coins from the test network,=
 which you want to observe. And then, everyone could do some "network reset=
", just by switching the signet challenge, and rebuilding the database.<br =
/><br />Another interesting model, is making a network, where mainnet and t=
estnet blocks are visible in the same timeline. Then, to make some new test=
 coins, you would just sign some mainnet coins. And to destroy them, you ju=
st burn them, or move them in the main network in any way, so they are no l=
onger pegged, and are skipped during Initial Blockchain Download in the tes=
t network.<br /><br />&gt; If we fix the difficulty reset bug, we might as =
well also fix the coin supply issue: get rid of the halving for testnet and=
 just make every block create new coins.<br /><br />To solve the problem of=
 getting the new test coins, people would need to realize the truth: testne=
t coins are supposed to be worthless. Which means, that performing all test=
s with zero satoshis should be fine, right? So, why those non-zero amounts =
are needed? Of course as a protection from spam. Which also means, that if =
someone has no coins, then we could allow including a transaction, if it pr=
ovides some Proof of Work instead, right?<br /><br />Because if you have 0.=
01 tBTC, then what does it mean? It is not something, which should be conve=
rted into BTC. It is worthless. However, it is used to express "data pushin=
g ability". It simply means, that if your transaction fee is 1 sat/vB, then=
 you can push 1 MB publicly, and reveal your test cases, so other users can=
 see them. But if instead of including transaction fee, users would share s=
ome Proof of Work, then the protocol could allow them to include their test=
s for free (or just cheaper than usual), because they did some work, so we =
could reward them accordingly to the hashes they found.<br /><br />By the w=
ay, even if we run out of coins, then there are still cases, where producin=
g new blocks with zero reward makes sense, because it affects locktimes, th=
e difficulty, and the whole Script is still followed to the letter, so all =
kinds of contracts are still executed (and for example timestamping a docum=
ent in some Proof of Work chain may be worthy, even if the miner didn't ear=
n any new coins by doing so). Another use case is unlocking some previously=
 mined coinbase transaction, because even a new block with no reward, still=
 counts as an additional confirmation.<br /><br /><div><div dir=3D"auto">su=
nday, 31 march 2024 at 18:24:37 UTC+2 Luke Dashjr wrote:<br /></div><blockq=
uote style=3D"margin: 0px 0px 0px 0.8ex; border-left: 1px solid rgb(204, 20=
4, 204); padding-left: 1ex;"><u></u>

 =20
   =20
 =20
  <div>
    <p>Is the difficulty reset bug actually a bug, or a feature?</p>
    <p>If it's a bug, couldn't we just fix it and let the blockchain
      reorg on its own?</p>
    <p>Signet is definitely not a replacement for testnet.</p>
    <p>Luke</p></div><div>
    <p><br />
    </p>
    <div>On 3/31/24 09:19, Jameson Lopp wrote:<br />
    </div>
    </div><div><blockquote type=3D"cite">
      <div dir=3D"ltr">Hi all,
        <div><br />
        </div>
        <div>I'd like to open a discussion about testnet3 to put out
          some feelers on potential changes to it. First, a few facts:</div=
>
        <div><br />
        </div>
        <div>1. Testnet3 has been running for 13 years. It's on block
          2.5 million something and the block reward is down to ~0.014
          TBTC, so mining is not doing a great job at distributing
          testnet coins any more.</div>
        <div><br />
        </div>
        <div>2. The reason the block height is insanely high is due to a
          rather amusing edge case bug that causes the difficulty to
          regularly get reset to 1, which causes a bit of havoc. If you
          want a deep dive into the quirk:=C2=A0<a href=3D"https://blog.lop=
p.net/the-block-storms-of-bitcoins-testnet/" target=3D"_blank" rel=3D"nofol=
low">https://blog.lopp.net/the-block-storms-of-bitcoins-testnet/</a></div>
        <div><br />
        </div>
        <div>3. Testnet3 is being actively used for scammy airdrops;
          those of us who tend to be generous with our testnet coins are
          getting hounded by non-developers chasing cheap gains.</div>
        <div><br />
        </div>
        <div>4. As a result, TBTC is being actively bought and sold; one
          could argue that the fundamental principle of testnet=C2=A0coins
          having no value has been broken.</div>
        <div><br />
        </div>
        <div>This leads me to ponder the following questions, for which
          I'm soliciting feedback.</div>
        <div><br />
        </div>
        <div>1. Should we plan for a reset of testnet? If so, given how
          long it has been since the last reset and how many production
          systems will need to be updated, would a reset need to be done
          with a great deal of notice?</div>
        <div><br />
        </div>
        <div>2. Is there interest in fixing the difficulty reset bug? It
          should be a one liner fix, and I'd argue it could be done
          sooner rather than later, and orthogonal to the network reset
          question. Would such a change, which would technically be a
          hard fork (but also arguably a self resolving fork due to the
          difficulty dynamics) necessitate a BIP or could we just YOLO
          it?</div>
        <div><br />
        </div>
        <div>3. Is all of the above a waste of time and we should
          instead deprecate testnet in favor of signet?</div>
        <div><br />
        </div>
        <div>- Jameson</div>
      </div></blockquote></div><div><blockquote type=3D"cite">
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