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From: Andreas Schildbach <andreas@schildbach.de>
Date: Wed, 21 Sep 2016 14:00:23 +0200
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Subject: Re: [bitcoin-dev] Requesting BIP assignment; Flexible Transactions.
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Just glancing over your BIP, I wonder if we should use Protobuf. It uses
this "flexible" format already and is quite compact/binary. We use
Protobuf already for the payment protocol, and there is very good tool
support.