What's Changed in v0.4.0-rc.2

Features

• Add safeguards on VHTLC APIs (c260f9e)
• Ensure the same delegate fee address is always used across sessions (9ccf3bc)
• Add HD/single-key identity matrix to fulmine e2e tests (38ec8dd)

Bug Fixes

• Fix derivation of delegate private key from mnemonic (5ad3ede)
• Fix startup of legacy fulmine (080e016)
• Fix BIP-21 utils (fcd6ad7)
• Fixes to delegate behaviour (41c437e, 3047294)
• Fix web e2e test (f58716a)
• Add safechecks on VHTLC APIs (c260f9e)

Refactor / Cleanup

• Remove custom SendOffchain in favour of SDK default (2ed9cc5)
• Cleanup permissions and fix unit tests (f52bbc4)
• Cleanup templates & update web UI integration tests (0dac5f9)
• Update protos (44b9775)
• Drop unused/deprecated Dockerfiles (99db83b)
• Lint (392086a)

Dependencies & Infrastructure

• Bump Go → 1.26.5 (0f97aec)
• Bump go-sdk to 2026-07-28 pre-release commit (7ad2d37) ⚠️ go-sdk v0.10.2 not yet tagged
• Bump arkade-regtest (b7c794e)
• Use require.Eventually for VHTLC status checks in e2e tests (384aba9)

⚠️ Known Issues This RC

• build-and-upload CI step fails: ENOENT ./build/fulmine-linux-amd64 — binary artifacts not attached to this release
• Depends on github.com/arkade-os/go-sdk v0.10.2-0.20260728100801-5dfe88b5be1c (pseudo-version); go-sdk v0.10.2 must be tagged before the final v0.4.0 release

Full Changelog: v0.4.0-rc.1...v0.4.0-rc.2