Some thoughts and a confirmation of my understanding of 'BTCDD':
BTCDD is different than velocity in the traditional sense, because it uniquely accounts for how long an individual coin has been in the hands of the owner. 'Velocity' is a more generic measure which calculates how many times the same supply of money has passed through a given economy to support a given level of activity (GDP). If you applied this concept to Bitcoin, youd be fooled by the fact that transactional volume does not represent spending, because of the fact nearly all BTC transactions return some fraction of coins to the spender (although you cannot determine with certainty whether they are returning to the spenders wallet, or going someplace else as part of genuine additional spend; technically, it is impossible to see from any given naked transaction which is the spent part, and which is the change part). BTCDD deals with this by adjusting all transactions to account for the number of days since the public key associated with the coins spent (and therefore the coins themselves), last showed up in the block chain.
I also found:
http://abe.john-edwin-tobey.org/chain/Bitcoin?count=2016&hi=143075 and cranked the last 2 weeks of data through Excel very quickly to get a short term graph of the trend:
http://i.imgur.com/PJ74j.pngThe slope down and to the right represents a hoarding trend as time goes by and the BTC days figure ticks up by 7M / day, and the upticks represent some combination of medium sized transactions with old coin, or larger transactions with somewhat newer coin. Theoretically, I think the conditions for the reset of BTCDD to 100% would be that all coins issued transfer from all n outstanding funded wallets to a single destination wallet in one coordinated effort over a single 10 minute interval. This would necessarily involve at least n transactions. It is also well established that some BTC have been permanently destroyed, so this is technically impossible, not to mention that the block reward for that block would throw things off by 50 BTC.
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