Burrow is a proposal for a federated coinpool on top of hedgehog channels. The coinpool can have a bunch of cool properties:
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a single-honest-party assumption, so the federation can't rug any user unless the keyholders in the federation are all scoundrels
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users can onboard into the pool without an on-chain transaction (e.g. maybe you send in coins via lightning, or maybe another user gives you your first coins from within the pool)
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every onboarded user gets their own wallet interface with their own personal balance and Send/Receive buttons