Get multisig working pre-FCMP++/Carrot fork - #291
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Reuse the background sync cache for multisig sync, so that upon importing multisig info, the wallet doesn't need to rescan the chain and instead can just process the background cache.
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Reuses the background sync cache for multisig sync, so that upon importing multisig info, the wallet doesn't need to rescan the chain and instead can just process the background cache. This change is upstream-able.
This is a required change for a FCMP++ compatible wallet because with the existing impl (before this PR), the wallet may rescan the chain from many blocks below chain tip. With FCMP++, the wallet can't pop more than n blocks (100 is the default) because the pruned curve tree cannot go back that far, it has a max depth.
I'm planning to look into porting @kayabaNerve's drop-in compatible multisig next, building on top of this draft.(EDIT: @UkoeHB is moving multisig forward)