Fixed the target computation to trigger on syncs - old system would cause difficulty mismatches on syncs, reorgs, etc.

2026-07-27 19:21:39 +02:00
parent c16b88fc5a
commit 1288a64977
3 changed files with 86 additions and 25 deletions
@@ -41,6 +41,16 @@ bool Chain_LoadFromFile(blockchain_t* chain, const char* dirpath, uint256_t* out
 bool Chain_LoadBlockFromFile(const char* dirpath, uint64_t blockNumber, bool loadTransactions, block_t** outBlock, size_t* outTxCount);

 // Difficulty
-uint32_t Chain_ComputeNextTarget(blockchain_t* chain, uint32_t currentTarget);
+// Retarget for the block at `height`, measured over the window [height - INTERVAL, height - 1].
+// `chain` must hold blocks 0..height-1. Takes no locks; safe to call while holding `chainLock`.
+uint32_t Chain_ComputeTargetAtHeight(blockchain_t* chain, uint64_t height, uint32_t currentTarget);
+
+// The consensus-required difficultyTarget for the block at `height`, derived from the chain alone.
+// Takes no locks; safe to call while holding `chainLock`.
+uint32_t Chain_GetTargetForHeight(blockchain_t* chain, uint64_t height);
+
+// Refresh runtime state derived from the chain tip (difficulty target, epoch DAG).
+// Call after any change to the tip. Must NOT be called while holding `chainLock`.
+void Chain_OnTipAdvanced(blockchain_t* chain);

 #endif