feat(cketh): expose the sweeper address in MinterInfo

[gregorydemay]

The minter derives a dedicated sweeper address from its master threshold-ECDSA public key, and that address' ETH balance is the prepaid gas available for sweeping funded deposit addresses. Until now that address was not observable from outside the canister, so there was no way to check how much sweep gas was left or to top it up.

get_minter_info now returns it as sweeper_address, alongside the existing minter_address. Like minter_address, it is null until the minter has fetched its public key.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Exposes the threshold-ECDSA-derived sweeper address through get_minter_info.

Changes:

• Adds optional sweeper_address to the Candid and Rust API.
• Derives the address from stored public-key material.
• Tests unavailable and initialized states.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rs/ethereum/cketh/test_utils/src/lib.rs	Adds the expected test sweeper address.
rs/ethereum/cketh/minter/tests/cketh.rs	Tests ckETH minter-info responses.
rs/ethereum/cketh/minter/tests/ckerc20.rs	Tests ckERC20 minter-info responses.
rs/ethereum/cketh/minter/src/state.rs	Exposes sweeper-address derivation from state.
rs/ethereum/cketh/minter/src/main.rs	Returns the address from get_minter_info.
rs/ethereum/cketh/minter/src/endpoints.rs	Extends the Rust response type.
rs/ethereum/cketh/minter/cketh_minter.did	Extends the public Candid interface.

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[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to d49ba1a.

Security Overview

• 🔎 Scanned files: 7 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/783a9bd4-fb4e-4e10-ab3c-c2fb2ddfb92f?scanId=b090a510-d8d8-4473-b28d-db9aed42ddfa&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type

Relevant files

Enhancement

► rs/ethereum/cketh/minter.did     Add sweeper_address field to MinterInfo in did file ► rs/ethereum/cketh/minter/src/endpoints.rs     Add sweeper_address to MinterInfo struct ► rs/ethereum/cketh/minter/src/main.rs     Populate sweeper_address in get_minter_info ► rs/ethereum/cketh/minter/src/state.rs     Expose sweeper_address via state and import sweeper_address ► rs/ethereum/cketh/minter/tests/ckerc20.rs     Update tests to include SWEEPER_ADDRESS in MinterInfo ► rs/ethereum/cketh/minter/tests/cketh.rs     Update tests to include SWEEPER_ADDRESS in MinterInfo ► rs/ethereum/cketh/minter/test_utils/src/lib.rs     Add SWEEPER_ADDRESS constant

[mbjorkqvist]

LGTM, thanks @gregorydemay! Would it make sense to expose the sweeper address in the minter dashboard also (not necessarily as part of this PR)?

[gregorydemay]

LGTM, thanks @gregorydemay! Would it make sense to expose the sweeper address in the minter dashboard also (not necessarily as part of this PR)?

Good idea, I added it as a bullet to DEFI-2922.