add proposal to install salt sharing canister

rs/boundary_node/salt_sharing/proposals/install_03-03-2025_135629.md

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+# Install the Salt-Sharing Canister from Commit 374556b
+
+__Proposer__: Boundary Node Team at the DFINITY Foundation
+
+__Source code__: [374556b515a5c48782ddaf80cffb399cb83ce487][new-commit]
+
+[new-commit]: https://github.com/dfinity/ic/tree/374556b515a5c48782ddaf80cffb399cb83ce487
+
+## Summary
+
+The API boundary nodes are in a unique position to provide insights, as all external requests pass through them.
+This data is valuable not only for the operation of the Internet Computer Protocol, but also for dapp developers.
+As part of the [Levitron milestone](https://internetcomputer.org/roadmap#Platform%20Decentralization-Levitron),
+work is being done to make these insights publicly accessible.
+
+A key prerequisite for this milestone is the consistent anonymization of sensitive data.
+To achieve this, the salt-sharing canister is proposed as a solution,
+which securely distributes a shared salt exclusively to API boundary nodes,
+enabling them to consistently anonymize sensitive data such as IP addresses.
+
+For more information, take a look at the [corresponding forum post](https://forum.dfinity.org/t/observability-with-the-new-boundary-node-architecture/41725).
+
+## Verifying the Installation
+
+First, make sure your Git repository is up-to-date.
+
+```
+# Option A. Get a fresh copy of the code.
+git clone [email protected]:dfinity/ic.git && cd ic
+# Option B. If you already have a copy of the ICP repo.
+git fetch
+```
+
+Second, checkout the right revision of the code.
+
+```
+git checkout 374556b515a5c48782ddaf80cffb399cb83ce487
+```
+
+### Argument Verification
+
+The [didc][latest_didc] tool is required.
+
+[latest_didc]: https://github.com/dfinity/candid/releases/latest
+
+Fingerprint the canister argument:
+
+```
+didc encode \
+    -d rs/boundary_node/salt_sharing/canister/salt_sharing_canister.did \
+    -t '(InitArg)' \
+    '(
+        record {
+            salt_generation_strategy = variant { StartOfMonth };
+            regenerate_now = true;
+            registry_polling_interval_secs = 300 : nat64;
+        },
+    )' | xxd -r -p | sha256sum
+```
+
+This should match `arg_hash` field of this proposal.
+
+### WASM Verification
+
+See ["Building the code"][prereqs] for prerequisites.
+
+[prereqs]: https://github.com/dfinity/ic/tree/374556b515a5c48782ddaf80cffb399cb83ce487/README.adoc#building-the-code
+
+Build the release version of the canisters:
+
+```
+./ci/container/build-ic.sh -c
+```
+
+Fingerprint the canister module:
+
+```
+sha256sum ./artifacts/canisters/salt-sharing-canister.wasm.gz
+```
+
+This should match `wasm_module_hash` field of this proposal.