Cake electrs fork updates #2
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Only send a txid:tweak object if the output_pubkeys array has at least one unspent output. Otherwise, we end up having the client download a lot of data they will never use.
The smallest outpoint is chosen from all of the transaction inputs, not just the silent payment eligible inputs (see BIP352). In practice, most wallets will be spending the same input types together so its likely that the set of silent payments eligible inputs will be the same as the set of transaction inputs. Wallets can, however, add non-eligible inputs, such as OP_CHECKMULTISIG inputs. Fix by collecting all outpoints before filtering for the silent payments eligible inputs.
70,000 is way too early, update to 800,000 which is after taproot activation and a little before the first BIP352 transactions appear on chain. Ideally, this start height should be network specific considering taproot has always been activated on signet. Leave a comment to fix this in a followup.
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Been doing some testing and review, here are some bug fixes/improvements. Longterm, my goal is to get the electrs fork ready for a PR to the upstream electrs rep, but no reason not to update little things as I go along.
The main change here is now clients doing long rescans will download less data since a txid and tweak will only be included in the response if it has at least one unspent output.
Also let some thoughts in the comments (mostly for myself). cc @rafael-xmr