rpc: add target and bits to getblockchaininfo

Author: Sjors

src/rpc/blockchain.cpp

@@ -1299,6 +1299,8 @@ RPCHelpMan getblockchaininfo()
                 {RPCResult::Type::NUM, "blocks", "the height of the most-work fully-validated chain. The genesis block has height 0"},
                 {RPCResult::Type::NUM, "headers", "the current number of headers we have validated"},
                 {RPCResult::Type::STR, "bestblockhash", "the hash of the currently best block"},
+                {RPCResult::Type::STR_HEX, "bits", "nBits: compact representation of the block difficulty target"},
+                {RPCResult::Type::STR_HEX, "target", "The difficulty target"},
                 {RPCResult::Type::NUM, "difficulty", "the current difficulty"},
                 {RPCResult::Type::NUM_TIME, "time", "The block time expressed in " + UNIX_EPOCH_TIME},
                 {RPCResult::Type::NUM_TIME, "mediantime", "The median block time expressed in " + UNIX_EPOCH_TIME},
@@ -1337,6 +1339,8 @@ RPCHelpMan getblockchaininfo()
     obj.pushKV("blocks", height);
     obj.pushKV("headers", chainman.m_best_header ? chainman.m_best_header->nHeight : -1);
     obj.pushKV("bestblockhash", tip.GetBlockHash().GetHex());
+    obj.pushKV("bits", strprintf("%08x", tip.nBits));
+    obj.pushKV("target", GetTarget(tip, chainman.GetConsensus().powLimit).GetHex());
     obj.pushKV("difficulty", GetDifficulty(tip));
     obj.pushKV("time", tip.GetBlockTime());
     obj.pushKV("mediantime", tip.GetMedianTimePast());

test/functional/rpc_blockchain.py

@@ -133,6 +133,7 @@ def _test_getblockchaininfo(self):
 
         keys = [
             'bestblockhash',
+            'bits',
             'blocks',
             'chain',
             'chainwork',
@@ -142,6 +143,7 @@ def _test_getblockchaininfo(self):
             'mediantime',
             'pruned',
             'size_on_disk',
+            'target',
             'time',
             'verificationprogress',
             'warnings',
@@ -198,6 +200,9 @@ def _test_getblockchaininfo(self):
         assert_equal(res['prune_target_size'], 576716800)
         assert_greater_than(res['size_on_disk'], 0)
 
+        assert_equal(res['bits'], nbits_str(REGTEST_N_BITS))
+        assert_equal(res['target'], target_str(REGTEST_TARGET))
+
     def check_signalling_deploymentinfo_result(self, gdi_result, height, blockhash, status_next):
         assert height >= 144 and height <= 287