diff --git a/src/bench/Examples.cpp b/src/bench/Examples.cpp
--- a/src/bench/Examples.cpp
+++ b/src/bench/Examples.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "bench.h"
+#include "defaults.h"
 #include "utiltime.h"
 #include "validation.h"
 
diff --git a/src/bench/base58.cpp b/src/bench/base58.cpp
--- a/src/bench/base58.cpp
+++ b/src/bench/base58.cpp
@@ -5,6 +5,7 @@
 #include "bench.h"
 
 #include "base58.h"
+#include "defaults.h"
 #include "validation.h"
 
 #include <array>
diff --git a/src/bench/bench_bitcoin.cpp b/src/bench/bench_bitcoin.cpp
--- a/src/bench/bench_bitcoin.cpp
+++ b/src/bench/bench_bitcoin.cpp
@@ -5,6 +5,7 @@
 #include "bench.h"
 
 #include "crypto/sha256.h"
+#include "defaults.h"
 #include "key.h"
 #include "random.h"
 #include "util.h"
diff --git a/src/bench/checkblock.cpp b/src/bench/checkblock.cpp
--- a/src/bench/checkblock.cpp
+++ b/src/bench/checkblock.cpp
@@ -6,6 +6,7 @@
 
 #include "config.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "streams.h"
 #include "validation.h"
 
diff --git a/src/bench/checkqueue.cpp b/src/bench/checkqueue.cpp
--- a/src/bench/checkqueue.cpp
+++ b/src/bench/checkqueue.cpp
@@ -4,6 +4,7 @@
 
 #include "checkqueue.h"
 #include "bench.h"
+#include "defaults.h"
 #include "prevector.h"
 #include "random.h"
 #include "util.h"
diff --git a/src/blockencodings.cpp b/src/blockencodings.cpp
--- a/src/blockencodings.cpp
+++ b/src/blockencodings.cpp
@@ -7,6 +7,7 @@
 #include "config.h"
 #include "consensus/consensus.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "hash.h"
 #include "random.h"
 #include "streams.h"
diff --git a/src/defaults.h b/src/defaults.h
new file mode 100644
--- /dev/null
+++ b/src/defaults.h
@@ -0,0 +1,148 @@
+#ifndef BITCOIN_DEFAULTS_H
+#define BITCOIN_DEFAULTS_H
+
+#include "amount.h"
+#include "primitives/transaction.h"
+
+#define MIN_TRANSACTION_SIZE                                                   \
+    (::GetSerializeSize(CTransaction(), SER_NETWORK, PROTOCOL_VERSION))
+
+/** Default for DEFAULT_WHITELISTRELAY. */
+static const bool DEFAULT_WHITELISTRELAY = true;
+/** Default for DEFAULT_WHITELISTFORCERELAY. */
+static const bool DEFAULT_WHITELISTFORCERELAY = true;
+/** Default for -minrelaytxfee, minimum relay fee for transactions */
+static const Amount DEFAULT_MIN_RELAY_TX_FEE_PER_KB(1000 * SATOSHI);
+/** Default for -excessutxocharge for transactions transactions */
+static const Amount DEFAULT_UTXO_FEE = Amount::zero();
+//! -maxtxfee default
+static const Amount DEFAULT_TRANSACTION_MAXFEE(COIN / 10);
+//! Discourage users to set fees higher than this amount (in satoshis) per kB
+static const Amount HIGH_TX_FEE_PER_KB(COIN / 100);
+/** -maxtxfee will warn if called with a higher fee than this amount (in
+ * satoshis */
+static const Amount HIGH_MAX_TX_FEE(100 * HIGH_TX_FEE_PER_KB);
+/** Default for -limitancestorcount, max number of in-mempool ancestors */
+static const unsigned int DEFAULT_ANCESTOR_LIMIT = 25;
+/** Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool
+ * ancestors */
+static const unsigned int DEFAULT_ANCESTOR_SIZE_LIMIT = 101;
+/** Default for -limitdescendantcount, max number of in-mempool descendants */
+static const unsigned int DEFAULT_DESCENDANT_LIMIT = 25;
+/** Default for -limitdescendantsize, maximum kilobytes of in-mempool
+ * descendants */
+static const unsigned int DEFAULT_DESCENDANT_SIZE_LIMIT = 101;
+/** Default for -mempoolexpiry, expiration time for mempool transactions in
+ * hours */
+static const unsigned int DEFAULT_MEMPOOL_EXPIRY = 336;
+/** The maximum size of a blk?????.dat file (since 0.8) */
+static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB
+/** The pre-allocation chunk size for blk?????.dat files (since 0.8) */
+static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB
+/** The pre-allocation chunk size for rev?????.dat files (since 0.8) */
+static const unsigned int UNDOFILE_CHUNK_SIZE = 0x100000; // 1 MiB
+
+/** Maximum number of script-checking threads allowed */
+static const int MAX_SCRIPTCHECK_THREADS = 16;
+/** -par default (number of script-checking threads, 0 = auto) */
+static const int DEFAULT_SCRIPTCHECK_THREADS = 0;
+/** Number of blocks that can be requested at any given time from a single peer.
+ */
+static const int MAX_BLOCKS_IN_TRANSIT_PER_PEER = 16;
+/**
+ * Timeout in seconds during which a peer must stall block download progress
+ * before being disconnected.
+ */
+static const unsigned int BLOCK_STALLING_TIMEOUT = 2;
+/**
+ * Number of headers sent in one getheaders result. We rely on the assumption
+ * that if a peer sends less than this number, we reached its tip. Changing this
+ * value is a protocol upgrade.
+ */
+static const unsigned int MAX_HEADERS_RESULTS = 2000;
+/**
+ * Maximum depth of blocks we're willing to serve as compact blocks to peers
+ * when requested. For older blocks, a regular BLOCK response will be sent.
+ */
+static const int MAX_CMPCTBLOCK_DEPTH = 5;
+/**
+ * Maximum depth of blocks we're willing to respond to GETBLOCKTXN requests for.
+ */
+static const int MAX_BLOCKTXN_DEPTH = 10;
+/**
+ * Size of the "block download window": how far ahead of our current height do
+ * we fetch ? Larger windows tolerate larger download speed differences between
+ * peer, but increase the potential degree of disordering of blocks on disk
+ * (which make reindexing and in the future perhaps pruning harder). We'll
+ * probably want to make this a per-peer adaptive value at some point.
+ */
+static const unsigned int BLOCK_DOWNLOAD_WINDOW = 1024;
+/** Time to wait (in seconds) between writing blocks/block index to disk. */
+static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60;
+/** Time to wait (in seconds) between flushing chainstate to disk. */
+static const unsigned int DATABASE_FLUSH_INTERVAL = 24 * 60 * 60;
+/** Maximum length of reject messages. */
+static const unsigned int MAX_REJECT_MESSAGE_LENGTH = 111;
+/** Average delay between local address broadcasts in seconds. */
+static const unsigned int AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL = 24 * 24 * 60;
+/** Average delay between peer address broadcasts in seconds. */
+static const unsigned int AVG_ADDRESS_BROADCAST_INTERVAL = 30;
+/**
+ * Average delay between trickled inventory transmissions in seconds.
+ * Blocks and whitelisted receivers bypass this, outbound peers get half this
+ * delay.
+ */
+static const unsigned int INVENTORY_BROADCAST_INTERVAL = 5;
+/**
+ * Maximum number of inventory items to send per transmission.
+ * Limits the impact of low-fee transaction floods.
+ */
+static const unsigned int INVENTORY_BROADCAST_MAX_PER_MB =
+    7 * INVENTORY_BROADCAST_INTERVAL;
+/** Average delay between feefilter broadcasts in seconds. */
+static const unsigned int AVG_FEEFILTER_BROADCAST_INTERVAL = 10 * 60;
+/** Maximum feefilter broadcast delay after significant change. */
+static const unsigned int MAX_FEEFILTER_CHANGE_DELAY = 5 * 60;
+/** Block download timeout base, expressed in millionths of the block interval
+ * (i.e. 10 min) */
+static const int64_t BLOCK_DOWNLOAD_TIMEOUT_BASE = 1000000;
+/**
+ * Additional block download timeout per parallel downloading peer (i.e. 5 min)
+ */
+static const int64_t BLOCK_DOWNLOAD_TIMEOUT_PER_PEER = 500000;
+
+static const unsigned int DEFAULT_LIMITFREERELAY = 0;
+static const bool DEFAULT_RELAYPRIORITY = true;
+static const int64_t DEFAULT_MAX_TIP_AGE = 24 * 60 * 60;
+/**
+ * Maximum age of our tip in seconds for us to be considered current for fee
+ * estimation.
+ */
+static const int64_t MAX_FEE_ESTIMATION_TIP_AGE = 3 * 60 * 60;
+
+/** Default for -permitbaremultisig */
+static const bool DEFAULT_PERMIT_BAREMULTISIG = true;
+static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
+static const bool DEFAULT_TXINDEX = false;
+static const unsigned int DEFAULT_BANSCORE_THRESHOLD = 100;
+
+/** Default for -persistmempool */
+static const bool DEFAULT_PERSIST_MEMPOOL = true;
+/** Default for using fee filter */
+static const bool DEFAULT_FEEFILTER = true;
+
+/**
+ * Maximum number of headers to announce when relaying blocks with headers
+ * message.
+ */
+static const unsigned int MAX_BLOCKS_TO_ANNOUNCE = 8;
+
+/** Maximum number of unconnecting headers announcements before DoS score */
+static const int MAX_UNCONNECTING_HEADERS = 10;
+
+static const bool DEFAULT_PEERBLOOMFILTERS = true;
+
+/** Default for -stopatheight */
+static const int DEFAULT_STOPATHEIGHT = 0;
+
+#endif
\ No newline at end of file
diff --git a/src/init.cpp b/src/init.cpp
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -17,6 +17,7 @@
 #include "compat/sanity.h"
 #include "config.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "diskblockpos.h"
 #include "fs.h"
 #include "httprpc.h"
diff --git a/src/miner.cpp b/src/miner.cpp
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -15,6 +15,7 @@
 #include "consensus/merkle.h"
 #include "consensus/tx_verify.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "hash.h"
 #include "net.h"
 #include "policy/policy.h"
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -12,6 +12,7 @@
 #include "chainparams.h"
 #include "config.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "hash.h"
 #include "init.h"
 #include "merkleblock.h"
diff --git a/src/policy/policy.cpp b/src/policy/policy.cpp
--- a/src/policy/policy.cpp
+++ b/src/policy/policy.cpp
@@ -8,6 +8,7 @@
 
 #include "policy/policy.h"
 
+#include "defaults.h"
 #include "script/interpreter.h"
 #include "tinyformat.h"
 #include "util.h"
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -13,6 +13,7 @@
 #include "checkpoints.h"
 #include "clientversion.h"
 #include "config.h"
+#include "defaults.h"
 #include "net.h"
 #include "txmempool.h"
 #include "ui_interface.h"
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -13,9 +13,9 @@
 #include "guiutil.h"
 #include "optionsmodel.h"
 
+#include "defaults.h" // for DEFAULT_SCRIPTCHECK_THREADS and MAX_SCRIPTCHECK_THREADS
 #include "netbase.h"
-#include "txdb.h"       // for -dbcache defaults
-#include "validation.h" // for DEFAULT_SCRIPTCHECK_THREADS and MAX_SCRIPTCHECK_THREADS
+#include "txdb.h" // for -dbcache defaults
 
 #include <QDataWidgetMapper>
 #include <QDir>
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -12,12 +12,12 @@
 #include "guiutil.h"
 
 #include "amount.h"
+#include "defaults.h" // For DEFAULT_SCRIPTCHECK_THREADS
 #include "init.h"
 #include "intro.h"
 #include "net.h"
 #include "netbase.h"
-#include "txdb.h"       // for -dbcache defaults
-#include "validation.h" // For DEFAULT_SCRIPTCHECK_THREADS
+#include "txdb.h" // for -dbcache defaults
 
 #ifdef ENABLE_WALLET
 #include "wallet/wallet.h"
diff --git a/src/qt/test/rpcnestedtests.cpp b/src/qt/test/rpcnestedtests.cpp
--- a/src/qt/test/rpcnestedtests.cpp
+++ b/src/qt/test/rpcnestedtests.cpp
@@ -7,6 +7,7 @@
 #include "chainparams.h"
 #include "config.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "fs.h"
 #include "rpc/register.h"
 #include "rpc/server.h"
diff --git a/src/qt/test/wallettests.cpp b/src/qt/test/wallettests.cpp
--- a/src/qt/test/wallettests.cpp
+++ b/src/qt/test/wallettests.cpp
@@ -1,6 +1,7 @@
 #include "wallettests.h"
 
 #include "chainparams.h"
+#include "defaults.h"
 #include "dstencode.h"
 #include "qt/bitcoinamountfield.h"
 #include "qt/optionsmodel.h"
diff --git a/src/qt/transactiondesc.cpp b/src/qt/transactiondesc.cpp
--- a/src/qt/transactiondesc.cpp
+++ b/src/qt/transactiondesc.cpp
@@ -10,6 +10,7 @@
 #include "transactionrecord.h"
 
 #include "consensus/consensus.h"
+#include "defaults.h"
 #include "dstencode.h"
 #include "script/script.h"
 #include "timedata.h"
diff --git a/src/qt/transactionrecord.cpp b/src/qt/transactionrecord.cpp
--- a/src/qt/transactionrecord.cpp
+++ b/src/qt/transactionrecord.cpp
@@ -5,6 +5,7 @@
 #include "transactionrecord.h"
 
 #include "consensus/consensus.h"
+#include "defaults.h"
 #include "dstencode.h"
 #include "timedata.h"
 #include "validation.h"
diff --git a/src/qt/transactiontablemodel.cpp b/src/qt/transactiontablemodel.cpp
--- a/src/qt/transactiontablemodel.cpp
+++ b/src/qt/transactiontablemodel.cpp
@@ -14,6 +14,7 @@
 #include "walletmodel.h"
 
 #include "core_io.h"
+#include "defaults.h"
 #include "sync.h"
 #include "uint256.h"
 #include "util.h"
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -13,6 +13,7 @@
 #include "transactiontablemodel.h"
 
 #include "config.h"
+#include "defaults.h"
 #include "dstencode.h"
 #include "keystore.h"
 #include "net.h" // for g_connman
diff --git a/src/rest.cpp b/src/rest.cpp
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -6,6 +6,7 @@
 #include "chain.h"
 #include "chainparams.h"
 #include "config.h"
+#include "defaults.h"
 #include "httpserver.h"
 #include "primitives/block.h"
 #include "primitives/transaction.h"
diff --git a/src/rpc/abc.cpp b/src/rpc/abc.cpp
--- a/src/rpc/abc.cpp
+++ b/src/rpc/abc.cpp
@@ -4,6 +4,7 @@
 
 #include "config.h"
 #include "consensus/consensus.h"
+#include "defaults.h"
 #include "rpc/server.h"
 #include "utilstrencodings.h"
 #include "validation.h"
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -12,6 +12,7 @@
 #include "coins.h"
 #include "config.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "hash.h"
 #include "policy/policy.h"
 #include "primitives/transaction.h"
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -13,6 +13,7 @@
 #include "consensus/params.h"
 #include "consensus/validation.h"
 #include "core_io.h"
+#include "defaults.h"
 #include "dstencode.h"
 #include "init.h"
 #include "miner.h"
diff --git a/src/rpc/misc.cpp b/src/rpc/misc.cpp
--- a/src/rpc/misc.cpp
+++ b/src/rpc/misc.cpp
@@ -7,6 +7,7 @@
 #include "base58.h"
 #include "clientversion.h"
 #include "config.h"
+#include "defaults.h"
 #include "dstencode.h"
 #include "init.h"
 #include "net.h"
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -7,6 +7,7 @@
 #include "chainparams.h"
 #include "clientversion.h"
 #include "config.h"
+#include "defaults.h"
 #include "net.h"
 #include "net_processing.h"
 #include "netbase.h"
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -9,6 +9,7 @@
 #include "config.h"
 #include "consensus/validation.h"
 #include "core_io.h"
+#include "defaults.h"
 #include "dstencode.h"
 #include "init.h"
 #include "keystore.h"
diff --git a/src/script/scriptcache.cpp b/src/script/scriptcache.cpp
--- a/src/script/scriptcache.cpp
+++ b/src/script/scriptcache.cpp
@@ -6,6 +6,7 @@
 
 #include "crypto/sha256.h"
 #include "cuckoocache.h"
+#include "defaults.h"
 #include "primitives/transaction.h"
 #include "random.h"
 #include "script/sigcache.h"
diff --git a/src/test/DoS_tests.cpp b/src/test/DoS_tests.cpp
--- a/src/test/DoS_tests.cpp
+++ b/src/test/DoS_tests.cpp
@@ -6,6 +6,7 @@
 
 #include "chainparams.h"
 #include "config.h"
+#include "defaults.h"
 #include "keystore.h"
 #include "net.h"
 #include "net_processing.h"
diff --git a/src/test/blockcheck_tests.cpp b/src/test/blockcheck_tests.cpp
--- a/src/test/blockcheck_tests.cpp
+++ b/src/test/blockcheck_tests.cpp
@@ -6,6 +6,7 @@
 #include "config.h"
 #include "consensus/consensus.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "validation.h"
 
 #include "test/test_bitcoin.h"
diff --git a/src/test/coins_tests.cpp b/src/test/coins_tests.cpp
--- a/src/test/coins_tests.cpp
+++ b/src/test/coins_tests.cpp
@@ -4,6 +4,7 @@
 
 #include "coins.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "script/standard.h"
 #include "test/test_bitcoin.h"
 #include "uint256.h"
diff --git a/src/test/main_tests.cpp b/src/test/main_tests.cpp
--- a/src/test/main_tests.cpp
+++ b/src/test/main_tests.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "chainparams.h"
+#include "defaults.h"
 #include "net.h"
 #include "validation.h"
 
diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
--- a/src/test/miner_tests.cpp
+++ b/src/test/miner_tests.cpp
@@ -12,6 +12,7 @@
 #include "consensus/merkle.h"
 #include "consensus/tx_verify.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "policy/policy.h"
 #include "pubkey.h"
 #include "script/standard.h"
diff --git a/src/test/script_P2SH_tests.cpp b/src/test/script_P2SH_tests.cpp
--- a/src/test/script_P2SH_tests.cpp
+++ b/src/test/script_P2SH_tests.cpp
@@ -4,6 +4,7 @@
 
 #include "consensus/tx_verify.h"
 #include "core_io.h"
+#include "defaults.h"
 #include "key.h"
 #include "keystore.h"
 #include "policy/policy.h"
diff --git a/src/test/script_commitment_tests.cpp b/src/test/script_commitment_tests.cpp
--- a/src/test/script_commitment_tests.cpp
+++ b/src/test/script_commitment_tests.cpp
@@ -8,6 +8,7 @@
 #include "chainparams.h"
 #include "config.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "validation.h"
 
 #include <boost/test/unit_test.hpp>
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -9,6 +9,7 @@
 #include "consensus/consensus.h"
 #include "consensus/validation.h"
 #include "crypto/sha256.h"
+#include "defaults.h"
 #include "fs.h"
 #include "key.h"
 #include "logging.h"
diff --git a/src/test/transaction_tests.cpp b/src/test/transaction_tests.cpp
--- a/src/test/transaction_tests.cpp
+++ b/src/test/transaction_tests.cpp
@@ -14,6 +14,7 @@
 #include "consensus/tx_verify.h"
 #include "consensus/validation.h"
 #include "core_io.h"
+#include "defaults.h"
 #include "key.h"
 #include "keystore.h"
 #include "policy/policy.h"
diff --git a/src/test/txvalidationcache_tests.cpp b/src/test/txvalidationcache_tests.cpp
--- a/src/test/txvalidationcache_tests.cpp
+++ b/src/test/txvalidationcache_tests.cpp
@@ -4,6 +4,7 @@
 
 #include "config.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "key.h"
 #include "keystore.h"
 #include "miner.h"
diff --git a/src/test/undo_tests.cpp b/src/test/undo_tests.cpp
--- a/src/test/undo_tests.cpp
+++ b/src/test/undo_tests.cpp
@@ -4,6 +4,7 @@
 
 #include "chainparams.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "undo.h"
 #include "validation.h"
 
diff --git a/src/test/validation_tests.cpp b/src/test/validation_tests.cpp
--- a/src/test/validation_tests.cpp
+++ b/src/test/validation_tests.cpp
@@ -6,6 +6,7 @@
 #include "chainparams.h"
 #include "config.h"
 #include "consensus/consensus.h"
+#include "defaults.h"
 #include "primitives/transaction.h"
 #include "test/test_bitcoin.h"
 #include "util.h"
diff --git a/src/test/versionbits_tests.cpp b/src/test/versionbits_tests.cpp
--- a/src/test/versionbits_tests.cpp
+++ b/src/test/versionbits_tests.cpp
@@ -5,6 +5,7 @@
 #include "chain.h"
 #include "chainparams.h"
 #include "consensus/params.h"
+#include "defaults.h"
 #include "test/test_bitcoin.h"
 #include "validation.h"
 #include "versionbits.h"
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -10,6 +10,7 @@
 #include "consensus/consensus.h"
 #include "consensus/tx_verify.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "policy/fees.h"
 #include "policy/policy.h"
 #include "streams.h"
diff --git a/src/validation.h b/src/validation.h
--- a/src/validation.h
+++ b/src/validation.h
@@ -51,147 +51,6 @@
 struct PrecomputedTransactionData;
 struct LockPoints;
 
-#define MIN_TRANSACTION_SIZE                                                   \
-    (::GetSerializeSize(CTransaction(), SER_NETWORK, PROTOCOL_VERSION))
-
-/** Default for DEFAULT_WHITELISTRELAY. */
-static const bool DEFAULT_WHITELISTRELAY = true;
-/** Default for DEFAULT_WHITELISTFORCERELAY. */
-static const bool DEFAULT_WHITELISTFORCERELAY = true;
-/** Default for -minrelaytxfee, minimum relay fee for transactions */
-static const Amount DEFAULT_MIN_RELAY_TX_FEE_PER_KB(1000 * SATOSHI);
-/** Default for -excessutxocharge for transactions transactions */
-static const Amount DEFAULT_UTXO_FEE = Amount::zero();
-//! -maxtxfee default
-static const Amount DEFAULT_TRANSACTION_MAXFEE(COIN / 10);
-//! Discourage users to set fees higher than this amount (in satoshis) per kB
-static const Amount HIGH_TX_FEE_PER_KB(COIN / 100);
-/** -maxtxfee will warn if called with a higher fee than this amount (in
- * satoshis */
-static const Amount HIGH_MAX_TX_FEE(100 * HIGH_TX_FEE_PER_KB);
-/** Default for -limitancestorcount, max number of in-mempool ancestors */
-static const unsigned int DEFAULT_ANCESTOR_LIMIT = 25;
-/** Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool
- * ancestors */
-static const unsigned int DEFAULT_ANCESTOR_SIZE_LIMIT = 101;
-/** Default for -limitdescendantcount, max number of in-mempool descendants */
-static const unsigned int DEFAULT_DESCENDANT_LIMIT = 25;
-/** Default for -limitdescendantsize, maximum kilobytes of in-mempool
- * descendants */
-static const unsigned int DEFAULT_DESCENDANT_SIZE_LIMIT = 101;
-/** Default for -mempoolexpiry, expiration time for mempool transactions in
- * hours */
-static const unsigned int DEFAULT_MEMPOOL_EXPIRY = 336;
-/** The maximum size of a blk?????.dat file (since 0.8) */
-static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB
-/** The pre-allocation chunk size for blk?????.dat files (since 0.8) */
-static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB
-/** The pre-allocation chunk size for rev?????.dat files (since 0.8) */
-static const unsigned int UNDOFILE_CHUNK_SIZE = 0x100000; // 1 MiB
-
-/** Maximum number of script-checking threads allowed */
-static const int MAX_SCRIPTCHECK_THREADS = 16;
-/** -par default (number of script-checking threads, 0 = auto) */
-static const int DEFAULT_SCRIPTCHECK_THREADS = 0;
-/** Number of blocks that can be requested at any given time from a single peer.
- */
-static const int MAX_BLOCKS_IN_TRANSIT_PER_PEER = 16;
-/**
- * Timeout in seconds during which a peer must stall block download progress
- * before being disconnected.
- */
-static const unsigned int BLOCK_STALLING_TIMEOUT = 2;
-/**
- * Number of headers sent in one getheaders result. We rely on the assumption
- * that if a peer sends less than this number, we reached its tip. Changing this
- * value is a protocol upgrade.
- */
-static const unsigned int MAX_HEADERS_RESULTS = 2000;
-/**
- * Maximum depth of blocks we're willing to serve as compact blocks to peers
- * when requested. For older blocks, a regular BLOCK response will be sent.
- */
-static const int MAX_CMPCTBLOCK_DEPTH = 5;
-/**
- * Maximum depth of blocks we're willing to respond to GETBLOCKTXN requests for.
- */
-static const int MAX_BLOCKTXN_DEPTH = 10;
-/**
- * Size of the "block download window": how far ahead of our current height do
- * we fetch ? Larger windows tolerate larger download speed differences between
- * peer, but increase the potential degree of disordering of blocks on disk
- * (which make reindexing and in the future perhaps pruning harder). We'll
- * probably want to make this a per-peer adaptive value at some point.
- */
-static const unsigned int BLOCK_DOWNLOAD_WINDOW = 1024;
-/** Time to wait (in seconds) between writing blocks/block index to disk. */
-static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60;
-/** Time to wait (in seconds) between flushing chainstate to disk. */
-static const unsigned int DATABASE_FLUSH_INTERVAL = 24 * 60 * 60;
-/** Maximum length of reject messages. */
-static const unsigned int MAX_REJECT_MESSAGE_LENGTH = 111;
-/** Average delay between local address broadcasts in seconds. */
-static const unsigned int AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL = 24 * 24 * 60;
-/** Average delay between peer address broadcasts in seconds. */
-static const unsigned int AVG_ADDRESS_BROADCAST_INTERVAL = 30;
-/**
- * Average delay between trickled inventory transmissions in seconds.
- * Blocks and whitelisted receivers bypass this, outbound peers get half this
- * delay.
- */
-static const unsigned int INVENTORY_BROADCAST_INTERVAL = 5;
-/**
- * Maximum number of inventory items to send per transmission.
- * Limits the impact of low-fee transaction floods.
- */
-static const unsigned int INVENTORY_BROADCAST_MAX_PER_MB =
-    7 * INVENTORY_BROADCAST_INTERVAL;
-/** Average delay between feefilter broadcasts in seconds. */
-static const unsigned int AVG_FEEFILTER_BROADCAST_INTERVAL = 10 * 60;
-/** Maximum feefilter broadcast delay after significant change. */
-static const unsigned int MAX_FEEFILTER_CHANGE_DELAY = 5 * 60;
-/** Block download timeout base, expressed in millionths of the block interval
- * (i.e. 10 min) */
-static const int64_t BLOCK_DOWNLOAD_TIMEOUT_BASE = 1000000;
-/**
- * Additional block download timeout per parallel downloading peer (i.e. 5 min)
- */
-static const int64_t BLOCK_DOWNLOAD_TIMEOUT_PER_PEER = 500000;
-
-static const unsigned int DEFAULT_LIMITFREERELAY = 0;
-static const bool DEFAULT_RELAYPRIORITY = true;
-static const int64_t DEFAULT_MAX_TIP_AGE = 24 * 60 * 60;
-/**
- * Maximum age of our tip in seconds for us to be considered current for fee
- * estimation.
- */
-static const int64_t MAX_FEE_ESTIMATION_TIP_AGE = 3 * 60 * 60;
-
-/** Default for -permitbaremultisig */
-static const bool DEFAULT_PERMIT_BAREMULTISIG = true;
-static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
-static const bool DEFAULT_TXINDEX = false;
-static const unsigned int DEFAULT_BANSCORE_THRESHOLD = 100;
-
-/** Default for -persistmempool */
-static const bool DEFAULT_PERSIST_MEMPOOL = true;
-/** Default for using fee filter */
-static const bool DEFAULT_FEEFILTER = true;
-
-/**
- * Maximum number of headers to announce when relaying blocks with headers
- * message.
- */
-static const unsigned int MAX_BLOCKS_TO_ANNOUNCE = 8;
-
-/** Maximum number of unconnecting headers announcements before DoS score */
-static const int MAX_UNCONNECTING_HEADERS = 10;
-
-static const bool DEFAULT_PEERBLOOMFILTERS = true;
-
-/** Default for -stopatheight */
-static const int DEFAULT_STOPATHEIGHT = 0;
-
 extern CScript COINBASE_FLAGS;
 extern CCriticalSection cs_main;
 extern CTxMemPool mempool;
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -5,6 +5,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "validation.h"
+#include "defaults.h"
 
 #include "arith_uint256.h"
 #include "blockindexworkcomparator.h"
@@ -18,6 +19,7 @@
 #include "consensus/merkle.h"
 #include "consensus/tx_verify.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "fs.h"
 #include "hash.h"
 #include "init.h"
diff --git a/src/wallet/fees.cpp b/src/wallet/fees.cpp
--- a/src/wallet/fees.cpp
+++ b/src/wallet/fees.cpp
@@ -6,6 +6,7 @@
 #include "wallet/fees.h"
 
 #include "config.h"
+#include "defaults.h"
 #include "policy/policy.h"
 #include "txmempool.h"
 #include "util.h"
diff --git a/src/wallet/finaltx.cpp b/src/wallet/finaltx.cpp
--- a/src/wallet/finaltx.cpp
+++ b/src/wallet/finaltx.cpp
@@ -5,6 +5,7 @@
 #include "chainparams.h"
 #include "config.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "primitives/transaction.h"
 #include "validation.h"
 
diff --git a/src/wallet/init.cpp b/src/wallet/init.cpp
--- a/src/wallet/init.cpp
+++ b/src/wallet/init.cpp
@@ -7,6 +7,7 @@
 #include "wallet/init.h"
 
 #include "config.h"
+#include "defaults.h"
 #include "net.h"
 #include "util.h"
 #include "utilmoneystr.h"
diff --git a/src/wallet/rpcdump.cpp b/src/wallet/rpcdump.cpp
--- a/src/wallet/rpcdump.cpp
+++ b/src/wallet/rpcdump.cpp
@@ -6,6 +6,7 @@
 #include "chain.h"
 #include "config.h"
 #include "core_io.h"
+#include "defaults.h"
 #include "dstencode.h"
 #include "init.h"
 #include "merkleblock.h"
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -9,6 +9,7 @@
 #include "config.h"
 #include "consensus/validation.h"
 #include "core_io.h"
+#include "defaults.h"
 #include "dstencode.h"
 #include "net.h"
 #include "policy/fees.h"
diff --git a/src/wallet/test/wallet_tests.cpp b/src/wallet/test/wallet_tests.cpp
--- a/src/wallet/test/wallet_tests.cpp
+++ b/src/wallet/test/wallet_tests.cpp
@@ -6,6 +6,7 @@
 
 #include "chainparams.h"
 #include "config.h"
+#include "defaults.h"
 #include "rpc/server.h"
 #include "test/test_bitcoin.h"
 #include "validation.h"
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -10,6 +10,7 @@
 #include "config.h"
 #include "consensus/consensus.h"
 #include "consensus/validation.h"
+#include "defaults.h"
 #include "dstencode.h"
 #include "fs.h"
 #include "init.h"
diff --git a/src/zmq/zmqnotificationinterface.cpp b/src/zmq/zmqnotificationinterface.cpp
--- a/src/zmq/zmqnotificationinterface.cpp
+++ b/src/zmq/zmqnotificationinterface.cpp
@@ -5,6 +5,7 @@
 #include "zmqnotificationinterface.h"
 #include "zmqpublishnotifier.h"
 
+#include "defaults.h"
 #include "streams.h"
 #include "util.h"
 #include "validation.h"
diff --git a/src/zmq/zmqpublishnotifier.cpp b/src/zmq/zmqpublishnotifier.cpp
--- a/src/zmq/zmqpublishnotifier.cpp
+++ b/src/zmq/zmqpublishnotifier.cpp
@@ -4,6 +4,7 @@
 
 #include "zmqpublishnotifier.h"
 #include "config.h"
+#include "defaults.h"
 #include "rpc/server.h"
 #include "streams.h"
 #include "util.h"