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Release Notes for [release-2025-09-25\_09-52-base](https://github.com/dfinity/ic/tree/release-2025-09-25_09-52-base) (`206b61a8616bc93d36d6a014e5cc8edf1ba256ae`)
=================================================================================================================================================================

This release is based on changes since [release-2025-09-19\_10-17-base](https://dashboard.internetcomputer.org/release/bf0d4d1b8cb6c0c19a5afa1454ada014847aa5c6) (`bf0d4d1b8cb6c0c19a5afa1454ada014847aa5c6`).

Please note that some commits may be excluded from this release if they're not relevant, or not modifying the GuestOS image.
Additionally, descriptions of some changes might have been slightly modified to fit the release notes format.

To see a full list of commits added since last release, compare the revisions on [GitHub](https://github.com/dfinity/ic/compare/release-2025-09-19_10-17-base...release-2025-09-25_09-52-base).

Features:
---------

* [`36914009c`](https://github.com/dfinity/ic/commit/36914009c) Consensus,Interface(XC): Add metrics for adapter header cache ([#6902](https://github.com/dfinity/ic/pull/6902))
* [`f5000e9b4`](https://github.com/dfinity/ic/commit/f5000e9b4) Consensus,Interface(nns-recovery): force `--use-local-binaries` to avoid unnecessary download ([#6818](https://github.com/dfinity/ic/pull/6818))
* [`17db4244d`](https://github.com/dfinity/ic/commit/17db4244d) Consensus,Interface(btc-adapter): implement a hybrid header cache ([#6797](https://github.com/dfinity/ic/pull/6797))
* [`1b79ba046`](https://github.com/dfinity/ic/commit/1b79ba046) Interface,Message Routing: Use hardlink to copy files in state sync ([#6701](https://github.com/dfinity/ic/pull/6701))
* [`c0b2ca58b`](https://github.com/dfinity/ic/commit/c0b2ca58b) Interface,Node(node): hard-code NNS public key to guestos image, allow dev override ([#6094](https://github.com/dfinity/ic/pull/6094))
* [`dcba006ad`](https://github.com/dfinity/ic/commit/dcba006ad) Node(XC): enable adapter on-disk cache for dogecoin in guest OS ([#6901](https://github.com/dfinity/ic/pull/6901))

Bugfixes:
---------

* [`206b61a86`](https://github.com/dfinity/ic/commit/206b61a86) Consensus,Interface(ic-recovery): ignore `ic_adapter` when downloading state ([#6930](https://github.com/dfinity/ic/pull/6930))
* [`5e8a0aa2b`](https://github.com/dfinity/ic/commit/5e8a0aa2b) Consensus,Interface: Don't attempt to insert existing certifications ([#6870](https://github.com/dfinity/ic/pull/6870))

Performance improvements:
-------------------------

* [`d34abf81c`](https://github.com/dfinity/ic/commit/d34abf81c) Crypto,Interface(crypto): Use a batch inversion for BLS12-381 Lagrange coefficients ([#6659](https://github.com/dfinity/ic/pull/6659))

Chores:
-------

* [`232017521`](https://github.com/dfinity/ic/commit/232017521) Execution,Interface: Remove mut reference to state in canister\_status ([#6880](https://github.com/dfinity/ic/pull/6880))
* [`b7cfa57b9`](https://github.com/dfinity/ic/commit/b7cfa57b9) Execution,Interface: EXC: Remove unused `StorageData` field ([#6844](https://github.com/dfinity/ic/pull/6844))
* [`2f56f172a`](https://github.com/dfinity/ic/commit/2f56f172a) Interface: bump rust to 1.89 ([#6758](https://github.com/dfinity/ic/pull/6758))
* [`b42f8cb3c`](https://github.com/dfinity/ic/commit/b42f8cb3c) Interface: do not check memory allocation bounds when loading checkpoint ([#6840](https://github.com/dfinity/ic/pull/6840))
* [`04227f6a1`](https://github.com/dfinity/ic/commit/04227f6a1) Interface,Message Routing: fix remaining\_chunks metric during dropping a state sync ([#6875](https://github.com/dfinity/ic/pull/6875))

Refactoring:
------------

* [`1ff0bd11f`](https://github.com/dfinity/ic/commit/1ff0bd11f) Execution,Interface: Move HttpQueryHandler declaration closer to its implementation ([#6905](https://github.com/dfinity/ic/pull/6905))

Tests:
------

* [`ed491a1fe`](https://github.com/dfinity/ic/commit/ed491a1fe) Consensus,Interface,Node(nns-recovery): add local NNS recovery test ([#6515](https://github.com/dfinity/ic/pull/6515))

---------------------------------------
Full list of changes (including the ones that are not relevant to GuestOS) can be found on [GitHub](https://github.com/dfinity/dre/blob/a8f4ea7b29e22f59f079553f5cf6fa58686eabeb/replica-releases/206b61a8616bc93d36d6a014e5cc8edf1ba256ae.md).

# IC-OS Verification

To build and verify the IC-OS GuestOS disk image, after installing curl if necessary (`sudo apt install curl`), run:

```
# From https://github.com/dfinity/ic#verifying-releases
curl -fsSL https://raw.githubusercontent.com/dfinity/ic/master/ci/tools/repro-check | python3 - -c 206b61a8616bc93d36d6a014e5cc8edf1ba256ae --guestos
```

The two SHA256 sums printed above from a) the downloaded CDN image and b) the locally built image, must be identical, and must match the SHA256 from the payload of the NNS proposal.

While not required for this NNS proposal, as we are only electing a new GuestOS version here, you have the option to verify the build reproducibility of the HostOS by passing `--hostos` to the script above instead of `--guestos`, or the SetupOS by passing `--setupos`.


Elect new IC/GuestOS revision (commit 206b61a)