Elect new IC/GuestOS revision (commit e3d101b)

Release Notes for release-2026-07-31_04-23-base (e3d101b22ae3fa02aca737f9fb96cc6c4ca83ac3) This release is based on changes since release-2026-07-23_04-21-base (1153c70d98a51ec2f023be9b3ce1d50c6b67da21).

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.

Features:

• e3d101b22 Core Protocol(Core): Switch to deterministic memory tracker (#10789)
• e73589fd6 Core Protocol(subnet-splitting): add subnet splitting status field to summary (#10933)
• a9372bcba Core Protocol: Export renamed consumed-cycles metrics under new names (#10892)
• 0f3c60f6a Core Protocol: enable replicated fetch_canister_logs (#10879)
• 91c7a2cb1 Core Protocol: Deliver initial spent HTTPS outcalls cycles (#10897)
• 7d259f65c Core Protocol: introduce BackwardsCompatible (#10694)
• 8a5b407c3 Node: Update config, regardless of NO keys (#10800)

Bugfixes:

• 4efca3fd6 Core Protocol: cycles metrics in the certified state tree (#10843)
• f0cc13d4b Core Protocol: account for canister history memory usage (#10825)
• b12ce42b9 Core Protocol: deflake //rs/execution_environment:memory_matrix_test (#10932)
• af4619d68 Core Protocol: resolve uninstall_code effective canister id with UninstallCodeArgs (#10934)
• 0d79c5d09 Core Protocol: Use regular cost for Wasm64 compilation (#10918)
• 90f14675a Core Protocol: account for fetch_canister_logs instructions (#10687)
• bec4d3885 Core Protocol(nns_delegation_manager): use custom DNS resolver in tests (#10862)

Performance improvements:

Chores:

• 483a94d5b Core Protocol: Log created or received IDKG complaints (#10951)
• a1d61d448 Core Protocol: Increase current certification version to V27 (#10944)
• 3622b58e7 Core Protocol(bazel): bump rules_rust to bazelbuild/rules_rust@5f04c8c1 (#10900)
• c8da0a12c Core Protocol(core): Bump libflate (#10911)
• da1ef8073 Core Protocol: Make HTTP context's cost schedule mandatory and start using it (#10872)
• 0d0c9a0e9 Core Protocol: bump nix 0.24.3 -> 0.31.3 (#10880)
• fba107bca Core Protocol,Node: use new ic-cdk apis (#10920)
• dd4c052d8 Core Protocol,Node: use new ic-cdk naming (#10886)
• 5dbfe6624 Node: evaluate Remote Build Execution (RBE) @ Namespace (#10579)
• e8e9c7a77 Node: Update Base Image Refs [2026-07-28-0145] (#10922)
• e0c0a5fc6 Node: Bump boundary node crates (#10917)
• b9425e835 Node: Update Base Image Refs [2026-07-24-0145] (#10891)
• 394334358 Node: Update Base Image Refs [2026-07-23-0851] (#10874)

Refactoring:

Tests:

Documentation:

Other changes:

Full list of changes (including the ones that are not relevant to GuestOS) can be found on GitHub.

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/e3d101b22ae3fa02aca737f9fb96cc6c4ca83ac3/ci/scripts/repro-check | python3 - -c e3d101b22ae3fa02aca737f9fb96cc6c4ca83ac3 --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.