* [bitcoin-dev] Mutli-push op_return
@ 2017-01-09 2:09 Chris
2017-01-09 3:08 ` Luke Dashjr
0 siblings, 1 reply; 3+ messages in thread
From: Chris @ 2017-01-09 2:09 UTC (permalink / raw)
To: Bitcoin Protocol Discussion
Would there be an objection to making op_return outputs with two
pushdatas standard (same max data size)?
Use case is mostly tagging transactions so they can be returned by bloom
filtering nodes:
OP_RETURN <tag> <data>
Since bip37 nodes test each data element in each output script (which I
believe applies to op_return as well?) it provides a lightweight way of
fetching transactions where the tag matches a specific pattern.
It appears a sizable number of nodes/miners already accept such
transactions as this one was mined in the first block...
https://blockchain.info/tx/400b4738f1e4eab4062e085623b9a3a71670f5c0d42e32dbe5a4e71da5baabe0
- Chris
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [bitcoin-dev] Mutli-push op_return
2017-01-09 2:09 [bitcoin-dev] Mutli-push op_return Chris
@ 2017-01-09 3:08 ` Luke Dashjr
2017-01-09 4:32 ` Chris
0 siblings, 1 reply; 3+ messages in thread
From: Luke Dashjr @ 2017-01-09 3:08 UTC (permalink / raw)
To: Chris, Bitcoin Protocol Discussion
On Monday, January 09, 2017 2:09:09 AM Chris via bitcoin-dev wrote:
> Would there be an objection to making op_return outputs with two
> pushdatas standard (same max data size)?
Standards (BIPs) need to describe a specific use case and protocol for doing
it.
As you note, the default policy on most nodes is to allow such outputs.
Luke
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [bitcoin-dev] Mutli-push op_return
2017-01-09 3:08 ` Luke Dashjr
@ 2017-01-09 4:32 ` Chris
0 siblings, 0 replies; 3+ messages in thread
From: Chris @ 2017-01-09 4:32 UTC (permalink / raw)
To: Luke Dashjr, Bitcoin Protocol Discussion
Maybe I was too premature. The script wiki (which I realize might not be
up to date) says only one pushdata is allowed but I don't see that in
the code.
https://github.com/bitcoin/bitcoin/blob/e8cfe1ee2d01c493b758a67ad14707dca15792ea/src/policy/policy.cpp#L49
Am I missing something or am I correct to assume that multiple pushdatas
in op_return would normally be considered standard?
On 01/08/2017 10:08 PM, Luke Dashjr wrote:
> On Monday, January 09, 2017 2:09:09 AM Chris via bitcoin-dev wrote:
>> Would there be an objection to making op_return outputs with two
>> pushdatas standard (same max data size)?
> Standards (BIPs) need to describe a specific use case and protocol for doing
> it.
>
> As you note, the default policy on most nodes is to allow such outputs.
>
> Luke
>
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2017-01-09 2:09 [bitcoin-dev] Mutli-push op_return Chris
2017-01-09 3:08 ` Luke Dashjr
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