[bitcoin-dev] A summary of block size hardfork proposals

[bitcoin-dev] A summary of block size hardfork proposals

[jl2012]

Currently, there are 4 block size BIP by Bitcoin developers:

BIP100 by Jeff:  
http://gtf.org/garzik/bitcoin/BIP100-blocksizechangeproposal.pdf
BIP101 by Gavin:  
https://github.com/bitcoin/bips/blob/master/bip-0101.mediawiki
BIP102 by Jeff: https://github.com/bitcoin/bips/pull/173/files
BIP??? by Pieter (called "BIP103" below):  
https://gist.github.com/sipa/c65665fc360ca7a176a6

To facilitate further discussion, I'd like to summarize these  
proposals by a series of questions. Please correct me if I'm wrong.  
Something like sigop limit are less controversial and are not shown.

Should we use a BIP34-like voting mechanism to initiate the hardfork?
BIP100, 102, 103: No
BIP101: Yes

When should we initiate the hardfork?
BIP100: 2016-01-11
BIP101: 2 weeks after 75% miner support, but not before 2016-01-11
BIP102: 2015-11-11
BIP103: 2017-01-01

What should be the block size at initiation?
BIP100: 1MB
BIP101: 8MB
BIP102: 2MB
BIP103: 1MB

Should we allow further increase / decrease?
BIP100: By miner voting, 0.5x - 2x every 12000 blocks (~3 months)
BIP101: Double every 2 years, with interpolations in between (41.4% p.a.)
BIP102: No
BIP103: +4.4% every 97 days (double every 4.3 years, or 17.7% p.a.)

The earliest date for a >=2MB block?
BIP100: 2016-04-03 (assuming 10 minutes block)
BIP101: 2016-01-11
BIP102: 2015-11-11
BIP103: 2020-12-27

What should be the final block size?
BIP100: 32MB is the max, but it is possible to reduce by miner voting
BIP101: 8192MB
BIP102: 2MB
BIP103: 2048MB

When should we have the final block size?
BIP100: Decided by miners
BIP101: 30 years after initiation
BIP102: 2015-11-11
BIP103: 2063-07-09

Re: [bitcoin-dev] A summary of block size hardfork proposals (and a softforking one)

[odinn]

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Great summary, thanks.  Helpful to get general grasp of the main
things out there.

On 07/30/2015 11:14 AM, jl2012 via bitcoin-dev wrote:
> Currently, there are 4 block size BIP by Bitcoin developers:
> 
> BIP100 by Jeff: 
> http://gtf.org/garzik/bitcoin/BIP100-blocksizechangeproposal.pdf 
> BIP101 by Gavin: 
> https://github.com/bitcoin/bips/blob/master/bip-0101.mediawiki 
> BIP102 by Jeff: https://github.com/bitcoin/bips/pull/173/files 
> BIP??? by Pieter (called "BIP103" below): 
> https://gist.github.com/sipa/c65665fc360ca7a176a6
> 
> To facilitate further discussion, I'd like to summarize these
> proposals by a series of questions. Please correct me if I'm wrong.
> Something like sigop limit are less controversial and are not
> shown.
> 
> Should we use a BIP34-like voting mechanism to initiate the
> hardfork? BIP100, 102, 103: No BIP101: Yes
> 
> When should we initiate the hardfork? BIP100: 2016-01-11 BIP101: 2
> weeks after 75% miner support, but not before 2016-01-11 BIP102:
> 2015-11-11 BIP103: 2017-01-01
> 
> What should be the block size at initiation? BIP100: 1MB BIP101:
> 8MB BIP102: 2MB BIP103: 1MB
> 
> Should we allow further increase / decrease? BIP100: By miner
> voting, 0.5x - 2x every 12000 blocks (~3 months) BIP101: Double
> every 2 years, with interpolations in between (41.4% p.a.) BIP102:
> No BIP103: +4.4% every 97 days (double every 4.3 years, or 17.7%
> p.a.)
> 
> The earliest date for a >=2MB block? BIP100: 2016-04-03 (assuming
> 10 minutes block) BIP101: 2016-01-11 BIP102: 2015-11-11 BIP103:
> 2020-12-27
> 
> What should be the final block size? BIP100: 32MB is the max, but
> it is possible to reduce by miner voting BIP101: 8192MB BIP102:
> 2MB BIP103: 2048MB
> 
> When should we have the final block size? BIP100: Decided by
> miners BIP101: 30 years after initiation BIP102: 2015-11-11 BIP103:
> 2063-07-09
> 
> 
> 
> _______________________________________________ bitcoin-dev mailing
> list bitcoin-dev@lists.linuxfoundation.org 
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
> 

I'd like to add to this some remarks that are from an earlier discussion

Cameron Garnham added into a thread, at
http://bitcoin-development.narkive.com/iHmMh6bZ/bitcoin-development-prop
osed-alternatives-to-the-20mb-step-function#post65
"First off, I am glad that the idea of dynamic block size adjustment is
gaining some attention, in particular the model that I proposed.

I wanted to take some time and explain some of the philosophy of how,
and why, I proposed this this particular model.

When Bitcoin was first made, there was a 32MB block size limit; this
was quickly found to be open to spam (and potentially DOS, as the code
was not-at-all optimized to support large blocks), and was reduced to
1MB, this was a quick fix that was never intended to last; at some
point the network should come to an understanding, a consensus if you
will, of what (and how much) belongs in a block.
The core point of this is that miners have always, and will always;
hold the power, to decide what goes into blocks; this implicitly,
obviously, includes how large blocks are. Miners are able to come any
sort of agreement they wish, providing the bitcoin clients accept
their blocks as valid."
(...)
"the proposal introducing a consensus protocol for block sizes;
instead of just having a hard limit (enforced by everyone), instead,
we have a constant factor above the average block size over a fixed
intervals that is soft-forked by only the miners. (The next simplest
mathematical construct).
This proposal is entirely a soft-fork and may be implemented without
changing any client code what so ever. In-fact, it could be
implemented by only a simple 51% majority of miners, with-or-without
gaining the wider community consensus."


- -- 
http://abis.io ~
"a protocol concept to enable decentralization
and expansion of a giving economy, and a new social good"
https://keybase.io/odinn
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Re: [bitcoin-dev] CORRECTIONS: A summary of block size hardfork proposals

[jl2012]

I am making some corrections to my previous summary

Currently, there are 4 block size BIP by Bitcoin developers:

BIP100 by Jeff:  
http://gtf.org/garzik/bitcoin/BIP100-blocksizechangeproposal.pdf
BIP101 by Gavin:  
https://github.com/bitcoin/bips/blob/master/bip-0101.mediawiki
BIP102 by Jeff: https://github.com/bitcoin/bips/pull/173/files
BIP??? by Pieter (called "BIP103" below):  
https://gist.github.com/sipa/c65665fc360ca7a176a6

To facilitate further discussion, I'd like to summarize these  
proposals by a series of questions. Please correct me if I'm wrong.  
Something like sigop limit are less controversial and are not shown.

Should we use a miner voting mechanism to initiate the hardfork?
BIP100: Yes, support with 10800 out of last 12000 blocks (90%)
BIP101: Yes, support with 750 out of last 1000 blocks (75%)
BIP102: No
BIP103: No

When should we initiate the hardfork?
BIP100: 2016-01-11#
BIP101: 2 weeks after 75% miner support, but not before 2016-01-11
BIP102: 2015-11-11
BIP103: 2017-01-01

# The network does not actually fork until having 90% miner support

What should be the block size at initiation?
BIP100: 1MB
BIP101: 8MB*
BIP102: 2MB
BIP103: 1MB

* It depends on the exact time of initiation, e.g. 8MB if initiated on  
2016-01-11, 16MB if initiated on 2018-01-10.

Should we allow further increase / decrease?
BIP100: By miner voting, 0.5x - 2x every 12000 blocks (~3 months)
BIP101: Double every 2 years, with linear interpolations in between  
(41.4% p.a.)
BIP102: No
BIP103: +4.4% every 97 days (double every 4.3 years, or 17.7% p.a.)

The earliest date for a >=2MB block?
BIP100: 2016-04-03^
BIP101: 2016-01-11
BIP102: 2015-11-11
BIP103: 2020-12-27

^ Assuming 10 minutes blocks and votes cast before 2016-01-11 are not counted

What should be the final block size?
BIP100: 32MB is the max, but it is possible to reduce by miner voting
BIP101: 8192MB
BIP102: 2MB
BIP103: 2048MB

When should we have the final block size?
BIP100: Decided by miners
BIP101: 2036-01-06
BIP102: 2015-11-11
BIP103: 2063-07-09