On 11/16/2014 02:04 PM, Jorge Timón wrote:
> I remember people asking in #bitcoin-dev "Does anyone know any use
> case for greater sizes OP_RETURNs?" and me answering "I do not know of
> any use cases that require bigger sizes".

For reference, there was a brief time where I was irritated that the
size had been reduced to 40 bytes, because I had an application where I
wanted to put ECDSA in signatures in the OP_RETURN, and you're going to
need at least 64 bytes for that.   Unfortunately I can't remember now
what that application was, so it's difficult for me to argue for it. 
But I don't think that's an unreasonable use case:  sending a payment
with a signature, essentially all timestamped in the blockchain.

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