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* [bitcoin-dev] Block size adjustment idea - expedience fees + difficulty scaling proportional to block size (+ fee pool)
       [not found]                                                                                                                                                                                                     ` <CAAt2M1-LZQ1yE1CezFA+hr+=de-RVJ7wzkq-t969BC7OL6dWwg@mail.gmail.com>
@ 2017-03-30  9:34                                                                                                                                                                                                       ` Natanael
  2017-03-30 10:04                                                                                                                                                                                                         ` Luke Dashjr
  2017-03-30 18:41                                                                                                                                                                                                         ` Natanael
  0 siblings, 2 replies; 6+ messages in thread
From: Natanael @ 2017-03-30  9:34 UTC (permalink / raw)
  To: Bitcoin Dev

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I had these following ideas as I was thinking about how to allow larger
blocks without incentivizing the creation of excessively large blocks. I
don't know how much of this is novel, I'd appreciate if anybody could link
to any relevant prior art. I'm making no claims on this, anything novel in
here is directly released into public domain.

In short, I'm trying to rely on simple but direct incentives to improve the
behavior of Bitcoin.

Feedback requested. Some simulations requested, see below if you're willing
to help. Any questions are welcome.

---

Expedience fees. Softfork compatible.

You want to really make sure your transaction gets processed quickly?
Transactions could have a second fee type, a specially labeled
anyone-can-spend output with an op_return value defining a "best-before"
block number and some function describing the decline of the fee value for
every future block, such that before block N the miners can claim the full
expedience fee + the standard fee (if any), between block N+1 and N+X the
miner can claim a reduced expedience fee + standard fee, afterwards only
the standard fee.

When a transaction is processed late such that not the full expedience fee
can be claimed, the remainder of the expedience fee output is returned to
the specified address among the inputs/outputs (could be something like
in#3 for the address used by the 3rd UTXO input). This would have to be
done for all remaining expedience fees within the last transaction in the
block, inserted there by the miner.

These additional UTXO:s does increase overhead somewhat, but hopefully not
by too much. If we're going to modify the transaction syntax eventually,
then we could take the chance to design for this to reduce overhead.

My current best idea for how to handle returned expedience fees in
multiuser transactions (coinjoin, etc) is to donate it to an agreed upon
address. For recurring donation addresses (the fee pool included!), this
reduces the number of return UTXO:s in the fee processing transaction.

The default client policy may be to split the entire fee across an
expedience fee and a fee pool donation, where the donation part becomes
larger the later the transaction gets processed. This is expected to slow
down the average inclusion speed of already delayed transactions, but they
remain profitable to include.

The dynamics here is simple, a miner is incentivized to process a
transaction with an expedience fee before a standard fee of the same
value-per-bit in order to not reduce the total value of the available fees
of all standing transactions they can process. The longer they wait, the
less total fees available.

Sidenote: a steady stream of expedience fees reduces the profitability of
block withholding attacks (!), at some threshold it should make it entirely
unprofitable vs standard mining. This is due to the increased risk of
losing valuable expedience fees added after you finished your first block
(as the available value will be reduced in your block #2, vs what other
miners can claim while still mining on that previous block).
(Can somebody verify this with simulations?)

---

Fee pool. Softfork compatible.

We want to smooth out fee payments too for the future when the subsidy
drops, to prevent deliberate forking to steal fees. We can introduce a
designated P2SH anyone-can-spend fee pool address. The miner can never
claim the full fees from his block or claim the full amount in the pool,
only some percentage of both. The remainder goes back into the pool (this
might be done at the end of the same expedience fee processing transaction
described above). Anybody can deliberately pay to the pool.

The fee pool is intended to act as a "buffer" such that it remains
profitable to not try to steal fees but to just mine normally, even during
relatively extreme fee value variance (consider the end of a big
international shopping weekend).

The fee value claimed by the miners between blocks is allowed to vary, but
we want to avoid order-of-magnitude size variation (10x). We do however
want the effect of expedience fees to have an impact. Perhaps some
logarithmic function can smooth it out? Forcing larger fees to be
distributed over longer time periods?

---

Block size dependent difficulty scaling. Hardfork required.

Larger blocks means greater difficulty - but it doesn't scale linearly,
rather a little less than linearly. That means miners can take a penalty in
difficulty to claim a greater number of high fee transactions in the same
amount of time (effectively increasing "block size bitrate"), increasing
their profits. When such profitable fees aren't available, they have to
reduce block size.

In other words, the users literally pay miners to increase block size (or
don't pay, which reduces it).

(Sidenote: I am in favor of combining this with the idea of a 32 MB max
blocksize (or larger), with softforked scheduled lower size caps (perhaps
starting at 4 MB max) that grows according to a schedule. This reduces the
risk of rapidly increasing load before we have functional second layer
scaling in place.)

In order for a miner to profit from adding additional transactions, their
fees must exceed the calculated cost of the resulting difficulty penalty to
make it worth it to create a larger block. Such loads are expected during
international shopping weekends.
With only a few available high value transactions the incentive becomes the
reverse, to create a smaller block with lower difficulty to faster claim
those fees.

To keep the average 10 minute block rate and to let this mechanism shift
the "block size bitrate" as according to the fee justified block size
changes, we set an Expected blocksize value that changes over time, and we
change the difficulty target into the Standard difficulty target, where
each block must reach a Scaled difficulty target .

In terms of math we do something like this:
Scaled difficulty = Standard difficulty * f(blocksize), where f would
likely be some logarithmic function, and blocksize is defined in terms of
units of Expected blocksize (a block 1.5x larger than Expected blocksize
gets a value of 1.5).

When we retarget the Standard difficulty and Expected blocksize we do this:
Standard difficulty = Network hashrate per 10 minutes (approximately same
as before, but now we take the Scaled difficulty of the last period's
previous blocks into consideration)
Standard blocksize = Recent average effective block bitrate = (sum of
recent (weighted!) block sizes / length of timeperiod) / number of blocks
in a retargeting period.

Thus, generating larger blocks drives up the long term standard block
bitrate, smaller blocks reduces it, in both cases we strive to average 1
block per 10 minutes.

Combining this with expedience fees makes it even more effective;

There's always a cutoff for where a miner stops including unprocessed
transactions and let the rest remain for the next block. For standard fees,
this would result in a fairly static block size and transactions backlog.
With expedience fees your transaction can bypass standard fees with same
value-per-bit, as explained above, because otherwise the miners reduces the
value of their future expected fees. The more people that do this, the
greater incentive to not delay transactions and instead increase the
blocksize. (Can somebody help with the math here? I want simulations of
this.)

(Sidenote: I'm in favor of RBF, replace-by-fee. This makes the above work
much more smoothly. Anybody relying on the security of unconfirmed
transactions for any significant value *have to* rely on some kind of
incentive protected multisignature transaction, including LN type second
layer schemes. The other option is just not secure.)

If load is low then you can add a high expedience fee to incentivize the
creation of a smaller block with your transaction, since difficulty will be
reduced for the smaller block. This means the miner has a higher chance of
beating the competition. Adding additional lower fee transactions may
reduce his average value-per-bit to become less profitable.

Miners simply aim to maximize their fees-per-bit, while also paying as
little as possible in mining costs.

To make this work as intended for those willing to explicitly pay to reduce
block size, one could tag such an expedience fee with a maximum allowed
blocksize (where the fee will be claimed in such a smaller block if it is
the more profitable option), such that it won't be countered by others
making more high expedience fees to increase blocksize. Note: I'm not
particularly in favor of this idea, just mentioning the possibility.

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^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [bitcoin-dev] Block size adjustment idea - expedience fees + difficulty scaling proportional to block size (+ fee pool)
  2017-03-30  9:34                                                                                                                                                                                                       ` [bitcoin-dev] Block size adjustment idea - expedience fees + difficulty scaling proportional to block size (+ fee pool) Natanael
@ 2017-03-30 10:04                                                                                                                                                                                                         ` Luke Dashjr
       [not found]                                                                                                                                                                                                           ` <CAAt2M1-57SMT4WT-4_pdkTPyybQgr2ZuQZW_KW2ZwhTQ7HEnqg@mail.gmail.com>
  2017-03-30 18:41                                                                                                                                                                                                         ` Natanael
  1 sibling, 1 reply; 6+ messages in thread
From: Luke Dashjr @ 2017-03-30 10:04 UTC (permalink / raw)
  To: bitcoin-dev, Natanael

On Thursday, March 30, 2017 9:34:31 AM Natanael via bitcoin-dev wrote:
> You want to really make sure your transaction gets processed quickly?
> Transactions could have a second fee type, a specially labeled
> anyone-can-spend output with an op_return value defining a "best-before"
> block number and some function describing the decline of the fee value for
> every future block, such that before block N the miners can claim the full
> expedience fee + the standard fee (if any), between block N+1 and N+X the
> miner can claim a reduced expedience fee + standard fee, afterwards only
> the standard fee.

Minor detail: OP_RETURN doesn't work like that. You'd need OP_DROP.

> When a transaction is processed late such that not the full expedience fee
> can be claimed, the remainder of the expedience fee output is returned to
> the specified address among the inputs/outputs (could be something like
> in#3 for the address used by the 3rd UTXO input). This would have to be
> done for all remaining expedience fees within the last transaction in the
> block, inserted there by the miner.

Inputs don't have addresses, and addresses should only ever be used once.
You might be able to fix this by increasing the value of the change, though.
It would require a new signature-check opcode at the very least.

I don't see a purpose to this proposal. Miners always mine as if it's their 
*only* chance to get the fee, because if they don't, another miner will. Ie, 
after 1 block, the fee effectively drops to 0 already.

> ---
> 
> Fee pool. Softfork compatible.

The standard problem with these is that miners are incentivised to publish 
their own "out of band fee" address so they get all the fee directly.

Luke


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [bitcoin-dev] Block size adjustment idea - expedience fees + difficulty scaling proportional to block size (+ fee pool)
       [not found]                                                                                                                                                                                                             ` <CAAt2M1-3R7rY55=QgkP8xUs=SDHxyNQV_fshbi89a9KzcwWfLQ@mail.gmail.com>
@ 2017-03-30 10:19                                                                                                                                                                                                               ` Natanael
  0 siblings, 0 replies; 6+ messages in thread
From: Natanael @ 2017-03-30 10:19 UTC (permalink / raw)
  To: Luke Dashjr; +Cc: Bitcoin Dev

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Den 30 mars 2017 12:04 skrev "Luke Dashjr" <luke@dashjr.org>:


I don't see a purpose to this proposal. Miners always mine as if it's their
*only* chance to get the fee, because if they don't, another miner will. Ie,
after 1 block, the fee effectively drops to 0 already.


I believe that with correctly configured incentives, you can make it more
profitable to delay some transactions with lower fees but still include
them in the next block then to include them all at once. This would smooth
out the inclusion of transactions.

This may require changing the difficulty scaling from using a simple
logarithm to a function that first behaves like a logarithm up to some
multiple of the standard block size, after which difficulty starts
increasing faster and reaches a greater-than-linear ratio in expected
required hash per mined bit. Perhaps tipping over at around a blocksize 3x
the standard blocksize. Since the standard blocksize increases with
continous load after retargeting, the blocksize at which this happens also
increases.

Also, together with the above the fee pool does slightly counteract what
you say, as they'll get a share via the pool when there's less transactions
available the next time they create a block (like insurance).

For a user, what's the incentive to pay an individual miner the fee
directly?

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^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [bitcoin-dev] Block size adjustment idea - expedience fees + difficulty scaling proportional to block size (+ fee pool)
  2017-03-30  9:34                                                                                                                                                                                                       ` [bitcoin-dev] Block size adjustment idea - expedience fees + difficulty scaling proportional to block size (+ fee pool) Natanael
  2017-03-30 10:04                                                                                                                                                                                                         ` Luke Dashjr
@ 2017-03-30 18:41                                                                                                                                                                                                         ` Natanael
  2017-03-31  4:14                                                                                                                                                                                                           ` Natanael
  1 sibling, 1 reply; 6+ messages in thread
From: Natanael @ 2017-03-30 18:41 UTC (permalink / raw)
  To: Bitcoin Dev

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Den 30 mars 2017 11:34 skrev "Natanael" <natanael.l@gmail.com>:

Block size dependent difficulty scaling. Hardfork required.

Larger blocks means greater difficulty - but it doesn't scale linearly,
rather a little less than linearly. That means miners can take a penalty in
difficulty to claim a greater number of high fee transactions in the same
amount of time (effectively increasing "block size bitrate"), increasing
their profits. When such profitable fees aren't available, they have to
reduce block size.

In other words, the users literally pay miners to increase block size (or
don't pay, which reduces it).


This can be simplified if we do get a fee pool (less hardfork code, more
softfork code), except that the effect will be partially reduced by the
mining subsidy until it approximately reaches parity with average total
fees.

We don't need to alter difficulty calculation.
Instead we alter the percentage of the fees that the miner gets to claim VS
what he have to donate to the pool based on the size of the block he
generated.
Larger block = smaller percentage of fees. This is another way to pay for
blocksize. The effect of this is that on average, miners that generate
smaller blocks takes a share of what otherwise would be part of the mining
profits of those generating larger blocks.

We would need to keep pieces of the section from above on expected
blocksize calculation. Because the closer you are to the expected
blocksize, the more you keep. And thus we need to adjust it according to
usage.

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^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [bitcoin-dev] Block size adjustment idea - expedience fees + difficulty scaling proportional to block size (+ fee pool)
  2017-03-30 18:41                                                                                                                                                                                                         ` Natanael
@ 2017-03-31  4:14                                                                                                                                                                                                           ` Natanael
  2017-03-31  4:15                                                                                                                                                                                                             ` Natanael
  0 siblings, 1 reply; 6+ messages in thread
From: Natanael @ 2017-03-31  4:14 UTC (permalink / raw)
  To: Bitcoin Dev

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Den 30 mars 2017 11:34 skrev "Natanael" <natanael.l@gmail.com>:

Block size dependent difficulty scaling. Hardfork required.

Larger blocks means greater difficulty - but it doesn't scale linearly,
rather a little less than linearly. That means miners can take a penalty in
difficulty to claim a greater number of high fee transactions in the same
amount of time (effectively increasing "block size bitrate"), increasing
their profits. When such profitable fees aren't available, they have to
reduce block size.

In other words, the users literally pay miners to increase block size (or
don't pay, which reduces it).


This can be simplified if we do get a fee pool (less hardfork code, more
softfork code), except that the effect will be partially reduced by the
mining subsidy until it approximately reaches parity with average total
fees.

We don't need to alter difficulty calculation.
Instead we alter the percentage of the fees that the miner gets to claim VS
what he have to donate to the pool based on the size of the block he
generated.
Larger block = smaller percentage of fees. This is another way to pay for
blocksize. The effect of this is that on average, miners that generate
smaller blocks takes a share of what otherwise would be part of the mining
profits of those generating larger blocks.

We would need to keep pieces of the section from above on expected
blocksize calculation. Because the closer you are to the expected
blocksize, the more you keep. And thus we need to adjust it according to
usage.

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^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [bitcoin-dev] Block size adjustment idea - expedience fees + difficulty scaling proportional to block size (+ fee pool)
  2017-03-31  4:14                                                                                                                                                                                                           ` Natanael
@ 2017-03-31  4:15                                                                                                                                                                                                             ` Natanael
  0 siblings, 0 replies; 6+ messages in thread
From: Natanael @ 2017-03-31  4:15 UTC (permalink / raw)
  To: Bitcoin Dev

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Sorry for sending a double, hit the wrong button...

Den 31 mars 2017 06:14 skrev "Natanael" <natanael.l@gmail.com>:

>
>
> Den 30 mars 2017 11:34 skrev "Natanael" <natanael.l@gmail.com>:
>
> Block size dependent difficulty scaling. Hardfork required.
>
> Larger blocks means greater difficulty - but it doesn't scale linearly,
> rather a little less than linearly. That means miners can take a penalty in
> difficulty to claim a greater number of high fee transactions in the same
> amount of time (effectively increasing "block size bitrate"), increasing
> their profits. When such profitable fees aren't available, they have to
> reduce block size.
>
> In other words, the users literally pay miners to increase block size (or
> don't pay, which reduces it).
>
>
> This can be simplified if we do get a fee pool (less hardfork code, more
> softfork code), except that the effect will be partially reduced by the
> mining subsidy until it approximately reaches parity with average total
> fees.
>
> We don't need to alter difficulty calculation.
> Instead we alter the percentage of the fees that the miner gets to claim
> VS what he have to donate to the pool based on the size of the block he
> generated.
> Larger block = smaller percentage of fees. This is another way to pay for
> blocksize. The effect of this is that on average, miners that generate
> smaller blocks takes a share of what otherwise would be part of the mining
> profits of those generating larger blocks.
>
> We would need to keep pieces of the section from above on expected
> blocksize calculation. Because the closer you are to the expected
> blocksize, the more you keep. And thus we need to adjust it according to
> usage.
>

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^ permalink raw reply	[flat|nested] 6+ messages in thread

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     [not found]                                                                                                                                                                                                     ` <CAAt2M1-LZQ1yE1CezFA+hr+=de-RVJ7wzkq-t969BC7OL6dWwg@mail.gmail.com>
2017-03-30  9:34                                                                                                                                                                                                       ` [bitcoin-dev] Block size adjustment idea - expedience fees + difficulty scaling proportional to block size (+ fee pool) Natanael
2017-03-30 10:04                                                                                                                                                                                                         ` Luke Dashjr
     [not found]                                                                                                                                                                                                           ` <CAAt2M1-57SMT4WT-4_pdkTPyybQgr2ZuQZW_KW2ZwhTQ7HEnqg@mail.gmail.com>
     [not found]                                                                                                                                                                                                             ` <CAAt2M1-3R7rY55=QgkP8xUs=SDHxyNQV_fshbi89a9KzcwWfLQ@mail.gmail.com>
2017-03-30 10:19                                                                                                                                                                                                               ` Natanael
2017-03-30 18:41                                                                                                                                                                                                         ` Natanael
2017-03-31  4:14                                                                                                                                                                                                           ` Natanael
2017-03-31  4:15                                                                                                                                                                                                             ` Natanael

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