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Install, reinstall or upgrade code of a canister controlled by the NNS.

# Backend Canister Upgrade

Introduces a concurrency cap on HTTP outcalls across features.

## What's Changed
_Since `proposal-backend-143905`_
* refactor(be): cap concurrent HTTPS outcalls per call site (#4356)


[Full release notes](https://github.com/dfinity/internet-identity/releases/tag/release-2026-09-18)

## Wasm Verification

To build the wasm modules yourself and verify their hashes, run the following commands from the root of the [Internet Identity repository](https://github.com/dfinity/internet-identity):

```
git pull  # to ensure you have the latest changes.
git checkout 5a2544495d70bd2c722cd38a4d6ecd37b02a4cdf
./scripts/verify-hash \
    --ii-hash d7e6b4da074f5af05f0b878cb7ab3da55a8d61c968ac35369feda1f136a96729 \
    --archive-hash d8dceb241eeba4a0a6fa8a5cf982557f110e4b5fb86024a0659846b581ce6e9b
```

## Backend Argument Verification

Run the following command to verify the backend upgrade argument hash:

```
didc encode -d ./src/internet_identity/internet_identity.did -t '(opt InternetIdentityInit)' '(
  opt record {
    archive_config = opt record {
      polling_interval_ns = 15_000_000_000 : nat64;
      entries_buffer_limit = 10_000 : nat64;
      module_hash = blob "\d8\dc\eb\24\1e\eb\a4\a0\a6\fa\8a\5c\f9\82\55\7f\11\0e\4b\5f\b8\60\24\a0\65\98\46\b5\81\ce\6e\9b";
      entries_fetch_limit = 1_000 : nat16;
    };
  },
)' | xxd -r -p | sha256sum
```

The output should match the argument hash.


Upgrade Internet Identity Backend Canister to 5a2544495