Add Ledger team update for 2025-02-12 (#540)

Author: lehins

blog/2025-02-12-ledger.md

@@ -0,0 +1,52 @@
+---
+title: Ledger Team Update
+slug: 2025-02-12-ledger
+authors: lehins
+tags: [ledger]
+hide_table_of_contents: false
+---
+
+## High level summary
+
+There were a few important performance improvements that had to do with:
+* Avoiding redundant computation when constructing context for plutus scripts
+* Reduction of memory overhead of some of the governance features
+* Removal of a space leak that retained transactions in memory for longer than it was necessary
+
+Other than improving performance we also focused on improving ledger interface and code
+organization, as well as some minor improvements to the test suite.
+
+
+## Low level summary
+
+### Features
+
+* [pull-4854] - `TxInfo` memoization
+* [pull-4826] - Reduce memory usage with sharing
+* [pull-4860] - Add CBOR instances for DefaultVote
+* [pull-4867] - Add `CanGetUTxO` and `CanSetUTxO` type classes
+* [pull-4868] - Organize ledger state
+* [pull-4872] - Make `utxosDeposited` field strict.
+
+### Testing
+
+* [pull-4862] - Bumped the spec to include fixes to `SecurityGroup` parameters
+* [pull-4877] - Add `genIssuerKeys` that can be used in consensus
+* [pull-4878] - Upgrade `cborg` dependency
+* [pull-4879] - Improve `mkAddr` and `mkCred` interface
+
+### Infrastructure and releasing
+
+* [pull-4883] - Remove broken symlink
+
+[pull-4854]: https://github.com/IntersectMBO/cardano-ledger/pull/4854
+[pull-4826]: https://github.com/IntersectMBO/cardano-ledger/pull/4826
+[pull-4860]: https://github.com/IntersectMBO/cardano-ledger/pull/4860
+[pull-4862]: https://github.com/IntersectMBO/cardano-ledger/pull/4862
+[pull-4867]: https://github.com/IntersectMBO/cardano-ledger/pull/4867
+[pull-4868]: https://github.com/IntersectMBO/cardano-ledger/pull/4868
+[pull-4877]: https://github.com/IntersectMBO/cardano-ledger/pull/4877
+[pull-4878]: https://github.com/IntersectMBO/cardano-ledger/pull/4878
+[pull-4872]: https://github.com/IntersectMBO/cardano-ledger/pull/4872
+[pull-4879]: https://github.com/IntersectMBO/cardano-ledger/pull/4879
+[pull-4883]: https://github.com/IntersectMBO/cardano-ledger/pull/4883