DFINITY Foundation

Synapse.vote (original)

ICDevs.org

CryptoIsGood

Anvil

ICPL.app

ysyms

The Accumulators’ Neuron

RawTech Venture

Paul Young

ICPMANUAL

8yeargangDAO

Isaac Valadez

Krzysztof Żelazko

Nicolas.ic

Smaug’s Neuron for Retail Investors

ICLight.io

Synapse.vote (NEW)

Taggr Network

CodeGov.org

Internet Computer Association

Arthur’s Neuron (used to be cycle_dao)

Inactive (Request Removal) - The Fools' Court

Always Rejects

John Wiegley

# Proposal to Upgrade the ckBTC Ledger Canister

Git hash: `1447ac3bc39da4d627a0f1367dfdeb131d270063`

New compressed Wasm hash: `34f37bac62bfaa84486cf7215f309b3d2bfe6c082b98a38208687c2be0dbaef5`

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

Previous ckBTC ledger proposal: https://dashboard.internetcomputer.org/proposal/122356

---

## Motivation

This proposal upgrades the ckBTC ledger canister to increase the memo length to 80 bytes (from the current 32 bytes), allowing more information to be encoded in the memo of transactions. The ckBTC minter canister could take advantage of this memo length increase for minting transactions by encoding the exact bitcoin transaction output for which ckBTC is minted.

## Upgrade args

```
git fetch
git checkout 1447ac3bc39da4d627a0f1367dfdeb131d270063
cd rs/rosetta-api/icrc1/ledger
didc encode -d ledger.did -t '(LedgerArg)' '(variant {Upgrade = opt record { max_memo_length = opt 80}})'
```

## Release Notes

```
$ git log --format="%C(auto) %h %s" efcadace5e5bf9f84c379f8fb16d942252ecaade..1447ac3bc39da4d627a0f1367dfdeb131d270063 rs/rosetta-api/icrc1/ledger

 adfc5cf38e chore: update ciborium version
 d9d7f811be feat(FI-801): use TryFrom for ledger_core TransferError
 1abeac2e62 Merge branch 'maciej-icrc2-flag' into 'master'
 45aff4f554 feat(FI-802): Add flag to enable ICRC-2 features in the ICRC ledger
 8750622cc0 fix(ICRC1) Add max memo length to upgrade args
 90c8a01659 feat(ledger_core) add TokensType trait
 eba371d34c feat(FI-781): add ICRC-2 approval and allowance endpoints to the ICRC ledger
 25a3917361 feat(FI-772) Add encoded block hash backwards compatibility test
 ef8ae6941f feat(FI-773): Add transfer_from functionality to the ICRC ledger
 9d9f5ef11d feat(FI-748): Add approve functionality to the ICRC ledger
 5134530046 feat(FI-753) Transform generic block to block
 4e4315b311 feat(FI-750) Add hashof package
 da910cf4ea feat(ledger_core): remove SpenderId type from Approval type
 18937632d4 test(ckbtc): e2e state machine test
 0ff31937a4 chore [icrc1 ledger] improve upgrade test
```

## Wasm Verification

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

```
git fetch
git checkout 1447ac3bc39da4d627a0f1367dfdeb131d270063
./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: 34f37bac62bfaa84486cf7215f309b3d2bfe6c082b98a38208687c2be0dbaef5