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High level description Bitcoin Core's fee estimation algorithm
The algorithm takes as input a target which represents a number of blocks within which you would like your transaction to be included in the blockchain. It returns a fee rate that you should use on your transaction in order to achieve this.
The algorithm is conceptually very simple and does not attempt to have any predictive power over future conditions. It only looks at some recent history of transactions and returns the lowest fee rate such that in that recent history a very high fraction of transactions with that fee rate were confirmed in the block chain in less than the target number of blocks.
Transactions can occur with a nearly continuous range of fee rates and so in order to avoid tracking every historical transaction independently, they are grouped into fee rate "buckets". A fee rate bucket represents a range of fee rates within which the algorithm treats all transactions as having approximately the same fee rate and the answer th
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Difference between Service, Factory and Provider in AngularJS
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I was at Amazon for about six and a half years, and now I've been at Google for that long. One thing that struck me immediately about the two companies -- an impression that has been reinforced almost daily -- is that Amazon does everything wrong, and Google does everything right. Sure, it's a sweeping generalization, but a surprisingly accurate one. It's pretty crazy. There are probably a hundred or even two hundred different ways you can compare the two companies, and Google is superior in all but three of them, if I recall correctly. I actually did a spreadsheet at one point but Legal wouldn't let me show it to anyone, even though recruiting loved it.
I mean, just to give you a very brief taste: Amazon's recruiting process is fundamentally flawed by having teams hire for themselves, so their hiring bar is incredibly inconsistent across teams, despite various efforts they've made to level it out. And their operations are a mess; they don't real
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