Mithril update 2025-12-03 (#699)

* Mithril update 2025-12-03

* Update blog/2025-12-03-mithril.md

Co-authored-by: olgahryniuk <67585499+olgahryniuk@users.noreply.github.com>

---------

Co-authored-by: olgahryniuk <67585499+olgahryniuk@users.noreply.github.com>

Author: jpraynaud

blog/2025-12-03-mithril.md

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+---
+title: Mithril Team Update
+slug: 2025-12-03-mithril
+authors: jpraynaud
+tags: [mithril]
+hide_table_of_contents: false
+---
+
+## High level overview
+
+This week, the Mithril team kept focusing on the SNARK-friendly STM library, completing the Schnorr signature scheme and modules reorganization, and implementing some wrappers for the Jubjub backend. They also progressed on specifying the non-recursive SNARK circuit, assessing constraints on Halo2 verification keys, prototyping the recursive SNARK solution, and prototyping the Bitcoin DeFi prover with RISC Zero.
+
+Additionally, they continued implementing a simple aggregator discovery mechanism, worked on improvements to the protocol security page, and completed enhancements to the end-to-end tests to better support the introduction of new features and improve the reliability of the backward-compatibility test.
+
+Finally, they worked on the second phase of the common aggregator client implementation and kept upgrading to Cardano node v.10.6.
+
+## Low level overview
+
+### Features
+
+- Completed the issue **Implement Schnorr signature scheme in STM** [#2756](https://github.com/input-output-hk/mithril/issues/2756)
+- Completed the issue **Re-organize modules of STM library** [#2793](https://github.com/input-output-hk/mithril/issues/2793)
+- Worked on the issue **Implement a simple aggregator discovery mechanism** [#2726](https://github.com/input-output-hk/mithril/issues/2726)
+- Worked on the issue **Experimental blst-Jubjub** [#2772](https://github.com/input-output-hk/mithril/issues/2772)
+- Worked on the issue **Compute the IVC state with SHA256 in the recursive circuit** [#2806](https://github.com/input-output-hk/mithril/issues/2806)
+- Worked on the issue **Document recursive SNARK solution** [#2767](https://github.com/input-output-hk/mithril/issues/2767)
+- Worked on the issue **Prepare specifications for the Mithril circuit** [#2797](https://github.com/input-output-hk/mithril/issues/2797)
+- Worked on the issue **Implement Jubjub/Poseidon backends wrappers in Schnorr signature scheme** [#2817](https://github.com/input-output-hk/mithril/issues/2817)
+- Worked on the issue **Assess constraints on Halo2 circuit verification** [#2799](https://github.com/input-output-hk/mithril/issues/2799)
+- Worked on the issue **Feasibility of Bitcoin Defi usecase** [#2818](https://github.com/input-output-hk/mithril/issues/2818)
+- Worked on the issue **Update protocol parameters to SNARK friendly values** [#2813](https://github.com/input-output-hk/mithril/issues/2813)
+- Worked on the issue **Proposals for Mithril/DMQ as optout feature of Cardano** [#2831](https://github.com/input-output-hk/mithril/issues/2831)
+
+### Protocol maintenance
+
+- Completed the issue **Certification stopped on mainnet and preview network** [#2805](https://github.com/input-output-hk/mithril/issues/2805)
+- Completed the issue **Enhance e2e test to support the introduction of new features** [#2781](https://github.com/input-output-hk/mithril/issues/2781)
+- Completed the issue **Enhance reliability of backward compatibility test** [#2760](https://github.com/input-output-hk/mithril/issues/2760)
+- Completed the issue **Stabilize Cardano DB v2 client CLI/library - Phase 4** [#2758](https://github.com/input-output-hk/mithril/issues/2758)
+- Completed the issue **Revise expiration delays for signed entity types** [#2826](https://github.com/input-output-hk/mithril/issues/2826)
+- Worked on the issue **Enhance protocol security page on website** [#2703](https://github.com/input-output-hk/mithril/issues/2703)
+- Worked on the issue **Upgrade to Cardano `10.6`** [#2790](https://github.com/input-output-hk/mithril/issues/2790)
+- Worked on the issue **Implement a common aggregator client - Phase 2** [#2827](https://github.com/input-output-hk/mithril/issues/2827)