Our tax admin takes the average over the whole year, so that tiny dippity-doo doesn't really help.
Then again it's a low 0.x percentage wealth tax and I really don't care about that (meaning, from my tax perspective, it can go up anytime).
Here's it's 2.1168% next year, based on your tally on the 1st of January. The Dutch Central Bank often advises not to invest in Bitcoin, but if you do, they take a larger cut each year.
Here (Spain) it is 1.7% above 3M€ to 5M€, 2.1% 5M-10M and 3.5% for anything above 10M.
That is at "market valuation at 31 DEC" (the exact time is not really clear, so assume either at the last second of the year, the average OR, BETTER YET, the worst favourable (highest of the day) case of all of them during all the day... just to be safe).
It's no wonder that, in the case of crypto, where it is not that uncommon that sometimes you aren't even sure the exact amount that you still have or not have under your control (misplaced seeds/keys, seeds that years ago were buried under heaps of concrete, etc) maybe some people could have a mismatch between what they declare (what they are SURE to "reasonably" control) and what they might eventually have on a later date after a huge amount of effort is employed on the "recovery" and a bit of luck (of course FULL gain should be reported in that case)... If they ever really need to get a hand on that part of their long "lost" stash.
Wealth tax is the most stupid and anti-progressive tax ever devised. It impairs all the good traits that should, instead, be promoted for the good of a country, and its citizens, in the long term.