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# Proposal to Upgrade the ckBTC Ledger Canister

Git hash: `7e694e300a6bc1e916745e8ce9dae9b49dfb0f02`

New compressed Wasm hash: 2650afc608af4f5852f882cd57d89f9c31095c9081fb0074dcb0767194e19147

Target canister: mxzaz-hqaaa-aaaar-qaada-cai

Previous ckBTC ledger proposal: https://dashboard.internetcomputer.org/proposal/124817

---

## Motivation

This is a proposal to upgrade the ckBTC ledger canister to enable the ICRC-2 endpoints. 
The following bug has been fixed: an approve block's `expires_at` field is now correctly encoded as a `u64` unsigned integer instead of an `object`.


## Upgrade args

```
git fetch
git checkout 7e694e300a6bc1e916745e8ce9dae9b49dfb0f02
cd rs/rosetta-api/icrc1/ledger
didc encode -d ledger.did -t '(LedgerArg)' '(variant{Upgrade=opt record{feature_flags=opt record{icrc2=true}}})'
```

## Release Notes

```
$ git log --format="%C(auto) %h %s" 9fce5907235a440b577c4d2b70844d40280b7eb3..7e694e300a6bc1e916745e8ce9dae9b49dfb0f02  rs/rosetta-api/icrc1/ledger

 a09de2208e feat(icrc1): changing expires_at from Timestamp to u64
 78836a179a chore: use the global workspace for the version of the futures crate
```

## Wasm Verification

Verify that the hash of the gzipped WASM matches the proposed hash.

```
git fetch
git checkout 7e694e300a6bc1e916745e8ce9dae9b49dfb0f02
./gitlab-ci/container/build-ic.sh -c
sha256sum ./artifacts/canisters/ic-icrc1-ledger.wasm.gz
```

Upgrade Nns Canister: mxzaz-hqaaa-aaaar-qaada-cai to wasm with hash: 2650afc608af4f5852f882cd57d89f9c31095c9081fb0074dcb0767194e19147