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Jose-Luis Landabaso has created rewindbitcoin which uses pre-signed transactions with key deletion.
Related tweet thread: https://x.com/landabaso/status/1933153049050017994
https://delvingbitcoin.org/t/the-unsuitability-of-presigned-transactions-for-vaults/113/8
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I saw this a awhile ago but couldn't figure out any details about how it works. The website tells me what it does (roughly), but they seem to expect us to trust them.
I suspect this one of those vaults with a bunch of presigned txs, else a multisig covenant.