a group (federation) that issues an asset that represents BTC and can be send and received inside the federation. It's not a sidechain nor layer-2. There's no blockchain.
Somewhat kinda like Liquid and L-BTC (in terms of peg in and out), but no liquid blockchain. And you can make lighting transaction across federations.
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You can create a sidechain and secure each other coins so to say. These side chains are interoperable through lightning.
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