Jeff Garzik on Sep 16 2015: During Scaling Bitcoin, Bitcoin Core committers and notable contributors got together and chatted about where a "greatest common denominator" type consensus might be. The following is a without-attribution (Chatham House) summary. This is my own personal summary of the chat; any errors are my own; this is not a consensus statement or anything formal.
Background (pre-conference, was on public IRC): "net-utxo", calculating
transaction size within block by applying a delta to transaction size based on the amount of data added, or removed, from the UTXO set. Fee is then evaluated after the delta is applied. This aligns user incentives with UTXO resource usage/cost. Original idea by gmaxwell (and others??).
Many interested or at least willing to accept a "short term bump", a hard
fork to modify block size limit regime to be cost-based via "net-utxo" rather than a simple static hard limit. 2-4-8 and 17%/year were debated and seemed "in range" with what might work as a short term bump - net after applying the new cost metric.
Hard fork method: Leaning towards "if (timestamp > X)" flag day hard
fork Y months in the future. Set high bit in version, resulting in a negative number, to more cleanly fork away. "miner advisement" - miners, as they've done recently, signal non-binding (Bitcoin Core does not examine the value) engineering readiness for a hard fork via coinbase moniker. Some fork cancellation method is useful, if unsuccessful after Z time elapses.
As discussed publicly elsewhere, other forks may be signaled via setting
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