Make forced block submission hash check result more informative.

src/stratifier.c

@@ -2082,9 +2082,18 @@ static bool local_block_submit(ckpool_t *ckp, char *gbt_block, const uchar *flip
 	/* Check failures that may be inconclusive but were submitted via other
 	 * means or accepted due to precious block call. */
 	if (!ret) {
+		/* If the block is accepted locally, it means we may have
+		 * displaced a known block, and are now working on this fork.
+		 * This makes the most sense since if we solve the next block,
+		 * it validates this one as the best chain, orphaning the other
+		 * block. In the case of mainnet, it means we have found a stale
+		 * block and are trying to force ours ahead of the other. In
+		 * a low diff environment we may have successive blocks, and
+		 * this will be the last one solved locally. Trying to optimise
+		 * regtest/testnet will optimise against the mainnet case. */
 		if (generator_get_blockhash(ckp, height, heighthash)) {
 			ret = !strncmp(rhash, heighthash, 64);
-			LOGWARNING("Hash for block height %d confirms block was %s",
+			LOGWARNING("Hash for forced possibly stale block, height %d confirms block was %s",
 				   height, ret ? "ACCEPTED" : "REJECTED");
 		}
 	}