Add `prev_blockhash` validation to `CheckPoint`#2115

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evanlinjin wants to merge 14 commits intobitcoindevkit:masterfrom

evanlinjin:cp_entry

Commits on Mar 5, 2026

feat(core): Add `prev_blockhash` method to `ToBlockHash` trait
evanlinjin
committed
feat(core): Initial work on `CheckPointEntry`
evanlinjin
committed
fix(core): `push` now errors on `prev_blockhash` mismatch
evanlinjin
committed
fix(core): `Checkpoint::insert` now evicts on `prev_blockhash` mismatch

evanlinjin
and
ValuedMammal
committed
fix(chain): `merge_chains` now takes account of `prev_blockhash`es
evanlinjin
committed
test(chain): make `TestLocalChain` generic and add `prev_blockhash` test

evanlinjin
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claude
committed
test(chain): Test `apply_update` with a single `CheckPoint<Header>`

ValuedMammal
authored and
evanlinjin
committed
test(core): add tests for CheckPoint::push and insert methods

committed
feat(chain)!: Relax the generic parameter for `LocalChain<D>`
evanlinjin
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feat(chain)!: Add `ApplyBlockError` for `prev_blockhash` validation

evanlinjin
and
claude
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docs(core): Add module-level docs for `checkpoint_entry`

evanlinjin
and
claude
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test(core): address review feedback on checkpoint tests

evanlinjin
and
claude
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fix(chain)!: make genesis immutable in `merge_chains`

evanlinjin
and
claude
committed
docs(core): address review feedback on docs and tests

evanlinjin
and
claude
committed