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6

Eltoo relies on a primitive SIGHASH_ANYPREVOUT or SIGHASH_NOINPUT (hereafter referred as APO) BPI118, constructing Eltoo from APO would be replacing the CHECKSIG figure 4 of Eltoo paper with a modified script. Most of this answer is based on a blog post by Russell O'Connor from this link(which goes into other covenant constructions too). For completeness, ...


3

Without eltoo (ie today) a watchtower needs to store a different justice transaction for every channel update in case the channel counterparty broadcasts (deliberately or accidentally) an expired channel state. With eltoo (once/if we have SIGHASH_ANYPREVOUT enabled onchain) a watchtower will only need to store a single justice transaction in case the channel ...


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