f - Validate PoW on fetched blocks

Author: jkczyz

lightning-block-sync/src/poll.rs

@@ -64,6 +64,10 @@ impl Validate for Block {
 	type T = ValidatedBlock;
 
 	fn validate(self, block_hash: BlockHash) -> BlockSourceResult<Self::T> {
+		self.header
+			.validate_pow(&self.header.target())
+			.or_else(|e| Err(BlockSourceError::persistent(e)))?;
+
 		if self.block_hash() != block_hash {
 			return Err(BlockSourceError::persistent("invalid block hash"));
 		}