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transactions: increase Emergency feerate to 300sat/vb
Fixes revault#86, although it's not an "insanely high feerate" as mentioned in the issue. The rationale for this was that WTs won't have a fee reserve dedicated to the Emergency fee bumping. We can use the reserve kept by watchtowers for bumping the Cancel, but it's only kept for active vaults. 300sat/vb is meant to be a sweet pot between: - too much reliance on WTs' reserves for the Cancel tx that they may not have (eg if most vaults are inactive) - incurring a too high barrier to entry (a larger feerate increases the minimum deposit value) and an Emergency cost (what % of funds are you ready to burn during an Emergency procedure? Supposedly 100% for game theory but hey)
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