On 12/08/2015 09:12 AM, Gavin Andresen via bitcoin-dev wrote: > Stuffing the segwitness merkle tree in the coinbase
If such a change is going to be deployed via a soft fork instead of a hard fork, then the coinbase is the worst place to put the segwitness merkle root. Instead, put it in the first output of the generation transaction as an OP_RETURN script. This is a better pattern because coinbase space is limited while output space is not. The next time there's a good reason to tie another merkle tree to a block, that proposal can be designated for the second output of the generation transaction.
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