Ultimately all of this comes down to currency power, which is why I personally hope one of these highly alternative web-of-trust currencies takes off and starts supplanting mainstream currency. (Any currency will end up getting corrupted too, eventually, though)
The only two I remember are Circles and LedgerLoops.
In Circles, each user gets their own currency not fungible with anyone else's. Payment channels are set up between each user and their immediate friends; users also allow automatic conversion between their currency and their friends' currency. Payments are routed through the trust network through a route that has capacity at each step - this is the anti-Sybil design - you always receive coins of your immediate friends' currency. Each user's coins are minted at a certain rate, and the system does accounts for the devaluation over time of each user's currency, so it's a bit like balances can be somewhat negative, and reset towards zero from either direction with time.
That's obviously a complex system, and radically unlike ordinary currencies. There are many reasons it probably doesn't work; I hope they all turn out to be wrong.
LedgerLoops is the other one I remember. Users post things they want to buy and things they want to sell. The system finds loops where each user gives something to the next in the loop. Apparently this is surprisingly efficient. There is no currency at all. This one, by contrast, is extremely simple, and also radically unlike ordinary currencies. This doesn't have a UBI component.
The only two I remember are Circles and LedgerLoops.
In Circles, each user gets their own currency not fungible with anyone else's. Payment channels are set up between each user and their immediate friends; users also allow automatic conversion between their currency and their friends' currency. Payments are routed through the trust network through a route that has capacity at each step - this is the anti-Sybil design - you always receive coins of your immediate friends' currency. Each user's coins are minted at a certain rate, and the system does accounts for the devaluation over time of each user's currency, so it's a bit like balances can be somewhat negative, and reset towards zero from either direction with time.
That's obviously a complex system, and radically unlike ordinary currencies. There are many reasons it probably doesn't work; I hope they all turn out to be wrong.
LedgerLoops is the other one I remember. Users post things they want to buy and things they want to sell. The system finds loops where each user gives something to the next in the loop. Apparently this is surprisingly efficient. There is no currency at all. This one, by contrast, is extremely simple, and also radically unlike ordinary currencies. This doesn't have a UBI component.