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John Wiegley

# Upgrade the Sns-wasm Canister to Commit 25c1bb0

__Proposer__: arshavir.ter.gabrielyan at dfinity.org

__Source code__: [25c1bb0227d9970f5673b908817d7c4962b29911][new-commit]

[new-commit]: https://github.com/dfinity/ic/tree/25c1bb0227d9970f5673b908817d7c4962b29911

## Summary

This release improves the SNS-W canister to prevent the possibility of duplicate SNS versions occurring along the blessed upgrade steps.

## New Commits

```
$ git log --format="%C(auto) %h %s" f5a63fd41933eee24ab3a6c71e43c67c1048e0db..25c1bb0227d9970f5673b908817d7c4962b29911 --  ./rs/nns/sns-wasm ./rs/sns/init
 49f6907295 refactor(sns-w): `UpgradeSteps::add_wasm` is infallible and so should not return a Result (#2870)
 09764767b3 fix(sns-w): Prevent adding duplicate SNS versions to SNS-W via the add_wasm API (#2837)
```


## Current Version

__Current git hash__: f5a63fd41933eee24ab3a6c71e43c67c1048e0db

__Current wasm hash__: 54a1274e04355fab3a10ec6b351735abf16ebf939b477e8863b6673a44fcf538


## Verification

See the general instructions on [how to verify] proposals like this. A "quick
start" guide is provided here.

[how to verify]: https://github.com/dfinity/ic/tree/25c1bb0227d9970f5673b908817d7c4962b29911/rs/nervous_system/docs/proposal_verification.md


### WASM Verification

See ["Building the code"][prereqs] for prerequisites.

[prereqs]: https://github.com/dfinity/ic/tree/25c1bb0227d9970f5673b908817d7c4962b29911/README.adoc#building-the-code

```
# 1. Get a copy of the code.
git clone git@github.com:dfinity/ic.git
cd ic
# Or, if you already have a copy of the ic repo,
git fetch
git checkout 25c1bb0227d9970f5673b908817d7c4962b29911

# 2. Build canisters.
./ci/container/build-ic.sh -c

# 3. Fingerprint the result.
sha256sum ./artifacts/canisters/sns-wasm-canister.wasm.gz
```

This should match `wasm_module_hash` field of this proposal.


Upgrade the Sns-wasm Canister to Commit 25c1bb0