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Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] new BIP: Self balancing between excessively
low/high fees and block size
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<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>
<div>True in case of hardfork to remove the current limit we still need a limit of lets say 8 Mbyte. To achive a valid 8MB block with this formula, the block would need to contain about 8 million btc fees. This will never happen. So probably a hard limit of 8MB would be good to avoid 1TB attacks.</div>
<div> </div>
<div>Regards,
<div name="quote" style="margin:10px 5px 5px 10px; padding: 10px 0 10px 10px; border-left:2px solid #C3D9E5; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">
<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Montag, 08. April 2019 um 02:55 Uhr<br/>
<b>Von:</b> "ZmnSCPxj" <ZmnSCPxj@protonmail.com><br/>
<b>An:</b> simondev1 <random@gmx.ch>, "Bitcoin Protocol Discussion" <bitcoin-dev@lists.linuxfoundation.org><br/>
<b>Betreff:</b> Re: [bitcoin-dev] new BIP: Self balancing between excessively low/high fees and block size</div>
<div name="quoted-content">Good morning simondev1,<br/>
<br/>
It seems the algorithm would greatly increase validation time.<br/>
In particular, if the current limit is removed (as in hardforked proposal) then a 1Tb block can be used to attack the network, since sorting would require looking through the entire block.<br/>
Thus, validation time would still limit the practical block sizes that can be deployed with this.<br/>
<br/>
Regards,<br/>
ZmnSCPxj<br/>
<br/>
Sent with ProtonMail Secure Email.<br/>
<br/>
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐<br/>
On Sunday, April 7, 2019 4:50 PM, simondev1 via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:<br/>
<br/>
> Dear bitcoin developers,<br/>
> <br/>
> New BIP: <a href="https://github.com/bitcoin/bips/pull/774" target="_blank">https://github.com/bitcoin/bips/pull/774</a><br/>
> <br/>
> ==Abstract==<br/>
> Logarithm of transaction fee limits block size.<br/>
> <br/>
> ==Motivation==<br/>
> Keep block space small.<br/>
> Waste less with spam transactions.<br/>
> Auto balance Fees: Increase very low fees, Descrease very high fees.<br/>
> Allow larger size when sender pays a lot.<br/>
> Allow wallets to calculate/display how much average free block space there is for each fee price.<br/>
> Allow senders to have more control about how the fee/priority of their transaction will behave, especially in the case of increased adoption in the future.<br/>
> <br/>
> ==Specification==<br/>
> Every transaction has to fit into the following block space:<br/>
> Input variable 'FeeInSatoshiPerByte': Must be positive or 0<br/>
> type: double<br/>
> unit: Satishi per byte<br/>
> Output:<br/>
> type: uint<br/>
> unit: bytes<br/>
> Formula:<br/>
> floor( log10( 1.1 + FeeInSatoshiPerByte ) * 1024 * 1024 )<br/>
> <br/>
> ==Implementation==<br/>
> Sort transactions by FeeInSatoshiPerByte (lowest first)<br/>
> For each transaction starting from lowest FeeInSatoshiPerByte: Sum up the bytes of space used so far. Check if summed up bytes of space used so far is smaller or equal than the formula result.<br/>
> If this is valid for each transaction then the blocksize is valid.<br/>
> <br/>
> ==Backward compatibility==<br/>
> Soft fork: If applied AND old hardcoded block size limit is kept.<br/>
> Hard fork: If applied AND old hardcoded block size limit is removed.<br/>
><br/>
> Regards, simondev1<br/>
><br/>
<br/>
</div>
</div>
</div>
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