[Custom Transactions] Add TxBuilder
trait, support fixed additional outputs
#3775
+352
−169
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hi @TheBlueMatt on this branch here i make an attempt at an API that supports "fixed additional outputs" on commitment transactions.
I place today's 330 sat anchors in that bucket, but the API should allow for custom ones.
The API should also let people customize all the existing outputs on the commitment transaction.
Question: How do we want to prioritize variable additional outputs (ie outputs that can be added and removed over the lifetime of a channel, similar to HTLCs) ?