I would like inform you - we have algo for "Curtly" without a need to move the coins periodically.
We solve this through a simple snapshot. A normal blockchain has a virtually snapshot also at the beginning, every account has 0 balance. And then coming the first transfer with some (or all) coins in a first block.
Our blockchain will be really curtly - it will contain only a set of the created blocks, always only i.e block for the last (i.e.) two years... It is the same, as we discussed this earlier above.
But
our blockchain will have a not standard virtually snapshot at the beginning - it will contain a real snapshot, where all accounts with a balance
or other, for the task of the blockchain needed information (smart contract i.e.) are listed in a
deterministic order.
After the real snapshot coming many blocks. The newest block contains the hash of the actual snapshot.
In every time-slot, between blocks, in every node will be the snapshot recalculated with the old snapshot and the following first (oldest, and not yet dropped) block.
Then every node calculating a hash, and this hash will be inserted in every generated new block. The other nodes can be then check, is the generated block and the snapshot of the generator node correct or not.
In our system, because of the possibility, we will calculating a fee for every coin, which stored in the snapshot. We will give this fee to the community which contains people active using, developing, supporting our ledger...
No more lost coins then. If somebody don't moving the coins, he / she will pay a fee with a such algo!
We prefer PoS coins.
Curtly will be a ledger for our backed money - Charm (
https://bitcointalk.org/index.php?topic=4392525.0).
More information (crowd-sale form, timeplan, and other details, ...) coming later.