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From: Jeff Garzik <jgarzik@bitpay.com>
Date: Wed, 21 May 2014 10:32:54 -0400
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Subject: [Bitcoin-development] PSA: Extending BIP 70 / payment protocol
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Please put any payment protocol extensions into a new draft BIP.  BIP
70 should not be updated continuously.

Mimic the IETF, where new RFCs are produced as protocols are extended.
 Once published, an IETF RFC is considered static.

That said, I think it is OK to be smart, and break the "static" rule a
bit for significant BIP bugs, or harmless maintenance of
links-to-resources.

-- 
Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc.      https://bitpay.com/