[bitcoin-dev] BIP141 segwit consensus rule update: extension of witness program definition

Luke Dashjr luke at dashjr.org
Wed Jun 8 16:45:10 UTC 2016


On Wednesday, June 08, 2016 8:23:51 AM Johnson Lau wrote:
> If someday 32 bytes hash is deemed to be unsafe, the txid would also be
> unsafe and a hard fork might be needed. Therefore, I don’t see how a
> witness program larger than 40 bytes would be useful in any case (as it is
> more expensive and takes more UTXO space). I think Pieter doesn’t want to
> make it unnecessarily lenient.

There is no harm in being lenient, but it limits the ability to do softfork 
upgrades in the future. I appreciate Pieter's concern that we'd need to do 
more development and testing to go to this extreme, which is why I am only 
asking the limit raised to 75 bytes.

Luke


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