add ava chow's wallet change

Author: kevkevinpal

_posts/2025-07-10-socratic-seminar-67.md

@@ -28,5 +28,10 @@ It allows multiple phones to create wallets with keyshares, and requires majorit
 
 A new type of hardware wallet using FROST (Flexible Round-Optimized Schnorr Threshold Signatures)
 
-[Frostsnap website](https://frostsnap.com/)
+[Frostsnap website](https://frostsnap.com/)  
 [FROST whitepaper](https://eprint.iacr.org/2020/852.pdf?ref=glossary.blockstream.com)
+
+## wallet: Keep track of the wallet's own transaction outputs in memory
+
+[Pull Request](https://github.com/bitcoin/bitcoin/pull/27286)
+"Currently, the wallet (bitcoin-core) is not actually aware about its own transaction outputs. Instead, it will iterate all of the transactions stored in mapWallet, and then all of the outputs of those transactions, in order to figure out what belongs to it for the purposes of coin selection and balance calculation. For balance calculation, there is caching that results in it only iterating all of the transactions, but not all of the outputs. However when the cache is dirty, everything is iterated. This is especially problematic for wallets that have a lot of transactions, or transactions that have a lot of unrelated outputs (as may occur with coinjoins or batched payments).” - achow101