services/legacy/common.go defines verifyHeadersChain and checkProofOfWork, but a repository-wide search finds no callers. unused is disabled for the legacy package, so the dead code persists and can misleadingly suggest that the active header path has these checks.
Remove the unused helpers and imports after checking for any remaining dependent symbols. Do not wire them into the live path as-is: the PoW helper only compares the hash with the header-declared target, without checking a network limit, and that check alone cannot establish checkpoint ancestry.
Acceptance: repository-wide symbol search shows no unresolved references, the legacy package builds and its relevant tests pass, and active header validation is documented at its actual call sites.
services/legacy/common.godefinesverifyHeadersChainandcheckProofOfWork, but a repository-wide search finds no callers.unusedis disabled for the legacy package, so the dead code persists and can misleadingly suggest that the active header path has these checks.Remove the unused helpers and imports after checking for any remaining dependent symbols. Do not wire them into the live path as-is: the PoW helper only compares the hash with the header-declared target, without checking a network limit, and that check alone cannot establish checkpoint ancestry.
Acceptance: repository-wide symbol search shows no unresolved references, the legacy package builds and its relevant tests pass, and active header validation is documented at its actual call sites.