diff --git a/consensus/engine/consensus_engine.go b/consensus/engine/consensus_engine.go
index 3e7cc3b34..0879a5f54 100644
--- a/consensus/engine/consensus_engine.go
+++ b/consensus/engine/consensus_engine.go
@@ -79,7 +79,7 @@ type Engine interface {
 	// via the VerifySeal method.
 	VerifyHeader(chain ChainReader, header *block.Header, seal bool) error
 
-	// Similiar to VerifyHeader, which is only for verifying the block headers of one's own chain, this verification
+	// VerifyHeaderSignature similar to VerifyHeader, which is only for verifying the block headers of one's own chain, this verification
 	// is used for verifying "incoming" block header against commit signature and bitmap sent from the other chain cross-shard via libp2p.
 	// i.e. this header verification api is more flexible since the caller specifies which commit signature and bitmap to use
 	// for verifying the block header, which is necessary for cross-shard block header verification. Example of such is cross-shard transaction.
diff --git a/core/blockchain.go b/core/blockchain.go
index a28df6bab..fda483165 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -126,6 +126,8 @@ type BlockChain interface {
 	GetHeaderByNumber(number uint64) *block.Header
 	// Config retrieves the blockchain's chain configuration.
 	Config() *params.ChainConfig
+	// Engine retrieves the blockchain's consensus engine.
+	Engine() engine.Engine
 	// SubscribeRemovedLogsEvent registers a subscription of RemovedLogsEvent.
 	SubscribeRemovedLogsEvent(ch chan<- RemovedLogsEvent) event.Subscription
 	// SubscribeTraceEvent registers a subscription of ChainEvent.
diff --git a/core/blockchain_impl.go b/core/blockchain_impl.go
index 5ed122420..515c4099f 100644
--- a/core/blockchain_impl.go
+++ b/core/blockchain_impl.go
@@ -49,8 +49,6 @@ import (
 	"github.com/harmony-one/harmony/core/types"
 	"github.com/harmony-one/harmony/core/vm"
 	"github.com/harmony-one/harmony/crypto/bls"
-	"github.com/harmony-one/harmony/internal/chain"
-	chain2 "github.com/harmony-one/harmony/internal/chain"
 	harmonyconfig "github.com/harmony-one/harmony/internal/configs/harmony"
 	"github.com/harmony-one/harmony/internal/params"
 	"github.com/harmony-one/harmony/internal/tikv"
@@ -192,6 +190,7 @@ type BlockChainImpl struct {
 	// procInterrupt must be atomically called
 	procInterrupt int32 // interrupt signaler for block processing
 
+	engine                 consensus_engine.Engine
 	processor              Processor // block processor interface
 	validator              Validator // block and state validator interface
 	vmConfig               vm.Config
@@ -205,9 +204,9 @@ type BlockChainImpl struct {
 // NewBlockChainWithOptions same as NewBlockChain but can accept additional behaviour options.
 func NewBlockChainWithOptions(
 	db ethdb.Database, stateCache state.Database, beaconChain BlockChain, cacheConfig *CacheConfig, chainConfig *params.ChainConfig,
-	vmConfig vm.Config, options Options,
+	engine consensus_engine.Engine, vmConfig vm.Config, options Options,
 ) (*BlockChainImpl, error) {
-	return newBlockChainWithOptions(db, stateCache, beaconChain, cacheConfig, chainConfig, vmConfig, options)
+	return newBlockChainWithOptions(db, stateCache, beaconChain, cacheConfig, chainConfig, engine, vmConfig, options)
 }
 
 // NewBlockChain returns a fully initialised block chain using information
@@ -215,15 +214,15 @@ func NewBlockChainWithOptions(
 // Processor.
 func NewBlockChain(
 	db ethdb.Database, stateCache state.Database, beaconChain BlockChain, cacheConfig *CacheConfig, chainConfig *params.ChainConfig,
-	vmConfig vm.Config,
+	engine consensus_engine.Engine, vmConfig vm.Config,
 ) (*BlockChainImpl, error) {
-	return newBlockChainWithOptions(db, stateCache, beaconChain, cacheConfig, chainConfig, vmConfig, Options{})
+	return newBlockChainWithOptions(db, stateCache, beaconChain, cacheConfig, chainConfig, engine, vmConfig, Options{})
 }
 
 func newBlockChainWithOptions(
 	db ethdb.Database, stateCache state.Database, beaconChain BlockChain,
 	cacheConfig *CacheConfig, chainConfig *params.ChainConfig,
-	vmConfig vm.Config, options Options) (*BlockChainImpl, error) {
+	engine consensus_engine.Engine, vmConfig vm.Config, options Options) (*BlockChainImpl, error) {
 
 	bodyCache, _ := lru.New(bodyCacheLimit)
 	bodyRLPCache, _ := lru.New(bodyCacheLimit)
@@ -267,6 +266,7 @@ func newBlockChainWithOptions(
 		blockAccumulatorCache:         blockAccumulatorCache,
 		leaderPubKeyFromCoinbase:      leaderPubKeyFromCoinbase,
 		blockchainPruner:              newBlockchainPruner(db),
+		engine:                        engine,
 		vmConfig:                      vmConfig,
 		badBlocks:                     badBlocks,
 		pendingSlashes:                slash.Records{},
@@ -353,7 +353,7 @@ func VerifyCrossLink(blockchain BlockChain, cl types.CrossLink) error {
 	if blockchain.ShardID() != shard.BeaconChainShardID {
 		return errors.New("[VerifyCrossLink] Shard chains should not verify cross links")
 	}
-	engine := chain.Engine()
+	engine := blockchain.Engine()
 
 	if err := engine.VerifyCrossLink(blockchain, cl); err != nil {
 		return errors.Wrap(err, "[VerifyCrossLink]")
@@ -424,7 +424,7 @@ func (bc *BlockChainImpl) ValidateNewBlock(block *types.Block, beaconChain Block
 			Msg("[ValidateNewBlock] Cannot validate header for the new block")
 		return err
 	}
-	if err := chain.Engine().VerifyVRF(
+	if err := bc.Engine().VerifyVRF(
 		bc, block.Header(),
 	); err != nil {
 		utils.Logger().Error().
@@ -436,7 +436,7 @@ func (bc *BlockChainImpl) ValidateNewBlock(block *types.Block, beaconChain Block
 			"[ValidateNewBlock] Cannot verify vrf for the new block",
 		)
 	}
-	err := chain.Engine().VerifyShardState(bc, beaconChain, block.Header())
+	err := bc.Engine().VerifyShardState(bc, beaconChain, block.Header())
 	if err != nil {
 		utils.Logger().Error().
 			Str("blockHash", block.Hash().Hex()).
@@ -1577,7 +1577,7 @@ func (bc *BlockChainImpl) insertChain(chain types.Blocks, verifyHeaders bool) (i
 			seals[i] = true
 		}
 		// Note that VerifyHeaders verifies headers in the chain in parallel
-		abort, results := chain2.Engine().VerifyHeaders(bc, headers, seals)
+		abort, results := bc.Engine().VerifyHeaders(bc, headers, seals)
 		verifyHeadersResults = results
 		defer close(abort)
 	}
@@ -2045,6 +2045,8 @@ func (bc *BlockChainImpl) GetHeaderByNumber(number uint64) *block.Header {
 
 func (bc *BlockChainImpl) Config() *params.ChainConfig { return bc.chainConfig }
 
+func (bc *BlockChainImpl) Engine() consensus_engine.Engine { return bc.engine }
+
 func (bc *BlockChainImpl) SubscribeRemovedLogsEvent(ch chan<- RemovedLogsEvent) event.Subscription {
 	return bc.scope.Track(bc.rmLogsFeed.Subscribe(ch))
 }
diff --git a/core/blockchain_stub.go b/core/blockchain_stub.go
index f1c27f574..f9e9111ea 100644
--- a/core/blockchain_stub.go
+++ b/core/blockchain_stub.go
@@ -141,6 +141,10 @@ func (a Stub) Config() *params.ChainConfig {
 	return nil
 }
 
+func (a Stub) Engine() engine.Engine {
+	return nil
+}
+
 func (a Stub) SubscribeRemovedLogsEvent(ch chan<- RemovedLogsEvent) event.Subscription {
 	return nil
 }
diff --git a/core/epochchain.go b/core/epochchain.go
index 507142f39..ede5ec5a7 100644
--- a/core/epochchain.go
+++ b/core/epochchain.go
@@ -8,6 +8,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/harmony-one/harmony/block"
+	"github.com/harmony-one/harmony/consensus/engine"
 	"github.com/harmony-one/harmony/core/rawdb"
 	"github.com/harmony-one/harmony/core/types"
 	"github.com/harmony-one/harmony/core/vm"
@@ -128,7 +129,7 @@ func (bc *EpochChain) InsertChain(blocks types.Blocks, _ bool) (int, error) {
 		}
 
 		// Signature validation.
-		err = chain.Engine().VerifyHeaderSignature(bc, block.Header(), sig, bitmap)
+		err = bc.Engine().VerifyHeaderSignature(bc, block.Header(), sig, bitmap)
 		if err != nil {
 			return i, errors.Wrap(err, "failed signature validation")
 		}
@@ -238,6 +239,10 @@ func (bc *EpochChain) Config() *params.ChainConfig {
 	return bc.chainConfig
 }
 
+func (bc *EpochChain) Engine() engine.Engine {
+	return chain.Engine()
+}
+
 func (bc *EpochChain) ReadShardState(epoch *big.Int) (*shard.State, error) {
 	cacheKey := string(epoch.Bytes())
 	if cached, ok := bc.shardStateCache.Get(cacheKey); ok {
diff --git a/core/epochchain_test.go b/core/epochchain_test.go
index 7a0d75423..91c85bfdb 100644
--- a/core/epochchain_test.go
+++ b/core/epochchain_test.go
@@ -12,7 +12,7 @@ import (
 
 func TestGenesisBlock(t *testing.T) {
 	db := rawdb.NewMemoryDatabase()
-	err := (&core.GenesisInitializer{NetworkType: nodeconfig.Mainnet}).InitChainDB(db, 0)
+	err := (&core.GenesisInitializer{}).InitChainDB(db, nodeconfig.Mainnet, 0)
 	require.NoError(t, err)
 
 	chain, err := core.NewEpochChain(db, nil, vm.Config{})
diff --git a/core/evm_test.go b/core/evm_test.go
index ed6821ff5..3201ee116 100644
--- a/core/evm_test.go
+++ b/core/evm_test.go
@@ -21,6 +21,7 @@ import (
 	"github.com/harmony-one/harmony/core/vm"
 	"github.com/harmony-one/harmony/crypto/bls"
 	"github.com/harmony-one/harmony/crypto/hash"
+	"github.com/harmony-one/harmony/internal/chain"
 	"github.com/harmony-one/harmony/internal/params"
 	"github.com/harmony-one/harmony/numeric"
 	staking "github.com/harmony-one/harmony/staking/types"
@@ -44,7 +45,7 @@ func getTestEnvironment(testBankKey ecdsa.PrivateKey) (*BlockChainImpl, *state.D
 	genesis := gspec.MustCommit(database)
 
 	// fake blockchain
-	chain, _ := NewBlockChain(database, state.NewDatabase(database), nil, nil, gspec.Config, vm.Config{})
+	chain, _ := NewBlockChain(database, state.NewDatabase(database), nil, nil, gspec.Config, chain.Engine(), vm.Config{})
 	db, _ := chain.StateAt(genesis.Root())
 
 	// make a fake block header (use epoch 1 so that locked tokens can be tested)
diff --git a/core/tx_pool_test.go b/core/tx_pool_test.go
index c3c3430d5..d6b181e18 100644
--- a/core/tx_pool_test.go
+++ b/core/tx_pool_test.go
@@ -29,6 +29,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/core/rawdb"
 	"github.com/harmony-one/harmony/crypto/bls"
+	"github.com/harmony-one/harmony/internal/chain"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -158,7 +159,7 @@ func createBlockChain() *BlockChainImpl {
 	database := rawdb.NewMemoryDatabase()
 	genesis := gspec.MustCommit(database)
 	_ = genesis
-	blockchain, _ := NewBlockChain(database, state.NewDatabase(database), nil, nil, gspec.Config, vm.Config{})
+	blockchain, _ := NewBlockChain(database, state.NewDatabase(database), nil, nil, gspec.Config, chain.Engine(), vm.Config{})
 	return blockchain
 }
 
diff --git a/hmy/downloader/adapter.go b/hmy/downloader/adapter.go
index 3d8f6ac97..c8758b506 100644
--- a/hmy/downloader/adapter.go
+++ b/hmy/downloader/adapter.go
@@ -25,6 +25,7 @@ type syncProtocol interface {
 
 type blockChain interface {
 	engine.ChainReader
+	Engine() engine.Engine
 
 	InsertChain(chain types.Blocks, verifyHeaders bool) (int, error)
 	WriteCommitSig(blockNum uint64, lastCommits []byte) error
diff --git a/hmy/downloader/downloader.go b/hmy/downloader/downloader.go
index b7d597c6b..01ec242ab 100644
--- a/hmy/downloader/downloader.go
+++ b/hmy/downloader/downloader.go
@@ -308,10 +308,10 @@ func verifyAndInsertBlock(bc blockChain, block *types.Block, nextBlocks ...*type
 		}
 	}
 
-	if err := chain.Engine().VerifyHeaderSignature(bc, block.Header(), sigBytes, bitmap); err != nil {
+	if err := bc.Engine().VerifyHeaderSignature(bc, block.Header(), sigBytes, bitmap); err != nil {
 		return &sigVerifyErr{err}
 	}
-	if err := chain.Engine().VerifyHeader(bc, block.Header(), true); err != nil {
+	if err := bc.Engine().VerifyHeader(bc, block.Header(), true); err != nil {
 		return errors.Wrap(err, "[VerifyHeader]")
 	}
 	if _, err := bc.InsertChain(types.Blocks{block}, false); err != nil {
diff --git a/internal/chain/engine.go b/internal/chain/engine.go
index 4337c2932..e01653646 100644
--- a/internal/chain/engine.go
+++ b/internal/chain/engine.go
@@ -45,10 +45,10 @@ type engineImpl struct {
 	verifiedSigCache *lru.Cache // verifiedSigKey -> struct{}{}
 }
 
-var internal = NewEngine()
+var internal engine.Engine = NewEngine()
 
 // NewEngine creates Engine with some cache
-func NewEngine() *engineImpl {
+func NewEngine() engine.Engine {
 	sigCache, _ := lru.New(verifiedSigCache)
 	epochCtxCache, _ := lru.New(epochCtxCache)
 	return &engineImpl{
@@ -57,7 +57,7 @@ func NewEngine() *engineImpl {
 	}
 }
 
-func Engine() *engineImpl {
+func Engine() engine.Engine {
 	return internal
 }
 
diff --git a/internal/shardchain/shardchains.go b/internal/shardchain/shardchains.go
index 957ba9150..771bfeb81 100644
--- a/internal/shardchain/shardchains.go
+++ b/internal/shardchain/shardchains.go
@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/harmony-one/harmony/core/state"
+	"github.com/harmony-one/harmony/internal/chain"
 	harmonyconfig "github.com/harmony-one/harmony/internal/configs/harmony"
 	nodeconfig "github.com/harmony-one/harmony/internal/configs/node"
 	"github.com/harmony-one/harmony/internal/shardchain/tikv_manage"
@@ -133,7 +134,7 @@ func (sc *CollectionImpl) ShardChain(shardID uint32, options ...core.Options) (c
 		}
 		if shardID == shard.BeaconChainShardID {
 			bc, err = core.NewBlockChainWithOptions(
-				db, stateCache, bc, cacheConfig, &chainConfig, vm.Config{}, opts,
+				db, stateCache, bc, cacheConfig, &chainConfig, chain.Engine(), vm.Config{}, opts,
 			)
 		} else {
 			beacon, ok := sc.pool[shard.BeaconChainShardID]
@@ -142,7 +143,7 @@ func (sc *CollectionImpl) ShardChain(shardID uint32, options ...core.Options) (c
 			}
 
 			bc, err = core.NewBlockChainWithOptions(
-				db, stateCache, beacon, cacheConfig, &chainConfig, vm.Config{}, opts,
+				db, stateCache, beacon, cacheConfig, &chainConfig, chain.Engine(), vm.Config{}, opts,
 			)
 		}
 	}
diff --git a/node/node_handler_test.go b/node/node_handler_test.go
index b0d276d71..92ef23677 100644
--- a/node/node_handler_test.go
+++ b/node/node_handler_test.go
@@ -33,9 +33,8 @@ func TestAddNewBlock(t *testing.T) {
 	if err != nil {
 		t.Fatalf("newhost failure: %v", err)
 	}
-	chainconfig := nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType().ChainConfig()
 	collection := shardchain.NewCollection(
-		nil, testDBFactory, &core.GenesisInitializer{NetworkType: nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType()}, &chainconfig,
+		nil, testDBFactory, &core.GenesisInitializer{}, nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType(),
 	)
 	decider := quorum.NewDecider(
 		quorum.SuperMajorityVote, shard.BeaconChainShardID,
@@ -89,9 +88,8 @@ func TestVerifyNewBlock(t *testing.T) {
 	if err != nil {
 		t.Fatalf("newhost failure: %v", err)
 	}
-	chainconfig := nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType().ChainConfig()
 	collection := shardchain.NewCollection(
-		nil, testDBFactory, &core.GenesisInitializer{NetworkType: nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType()}, &chainconfig,
+		nil, testDBFactory, &core.GenesisInitializer{}, nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType(),
 	)
 	decider := quorum.NewDecider(
 		quorum.SuperMajorityVote, shard.BeaconChainShardID,
@@ -144,9 +142,8 @@ func TestVerifyVRF(t *testing.T) {
 	if err != nil {
 		t.Fatalf("newhost failure: %v", err)
 	}
-	chainconfig := nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType().ChainConfig()
 	collection := shardchain.NewCollection(
-		nil, testDBFactory, &core.GenesisInitializer{NetworkType: nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType()}, &chainconfig,
+		nil, testDBFactory, &core.GenesisInitializer{}, nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType(),
 	)
 	blockchain, err := collection.ShardChain(shard.BeaconChainShardID)
 	if err != nil {
diff --git a/node/node_newblock_test.go b/node/node_newblock_test.go
index 5483e32c3..4843d3f91 100644
--- a/node/node_newblock_test.go
+++ b/node/node_newblock_test.go
@@ -34,9 +34,8 @@ func TestFinalizeNewBlockAsync(t *testing.T) {
 		t.Fatalf("newhost failure: %v", err)
 	}
 	var testDBFactory = &shardchain.MemDBFactory{}
-	chainconfig := nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType().ChainConfig()
 	collection := shardchain.NewCollection(
-		nil, testDBFactory, &core.GenesisInitializer{NetworkType: nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType()}, &chainconfig,
+		nil, testDBFactory, &core.GenesisInitializer{}, nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType(),
 	)
 	blockchain, err := collection.ShardChain(shard.BeaconChainShardID)
 	require.NoError(t, err)
diff --git a/node/node_test.go b/node/node_test.go
index 86bd2b10b..5f9d8ca51 100644
--- a/node/node_test.go
+++ b/node/node_test.go
@@ -36,9 +36,8 @@ func TestNewNode(t *testing.T) {
 	decider := quorum.NewDecider(
 		quorum.SuperMajorityVote, shard.BeaconChainShardID,
 	)
-	chainconfig := nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType().ChainConfig()
 	collection := shardchain.NewCollection(
-		nil, testDBFactory, &core.GenesisInitializer{NetworkType: nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType()}, &chainconfig,
+		nil, testDBFactory, &core.GenesisInitializer{}, nodeconfig.GetShardConfig(shard.BeaconChainShardID).GetNetworkType(),
 	)
 	blockchain, err := collection.ShardChain(shard.BeaconChainShardID)
 	if err != nil {
diff --git a/node/worker/worker_test.go b/node/worker/worker_test.go
index 7bd25c8db..3565be954 100644
--- a/node/worker/worker_test.go
+++ b/node/worker/worker_test.go
@@ -6,6 +6,7 @@ import (
 	"testing"
 
 	"github.com/harmony-one/harmony/core/state"
+	"github.com/harmony-one/harmony/internal/chain"
 
 	"github.com/ethereum/go-ethereum/core/rawdb"
 
@@ -43,7 +44,7 @@ func TestNewWorker(t *testing.T) {
 
 	genesis := gspec.MustCommit(database)
 	_ = genesis
-	chain, err := core.NewBlockChain(database, state.NewDatabase(database), &core.BlockChainImpl{}, nil, gspec.Config, vm.Config{})
+	chain, err := core.NewBlockChain(database, state.NewDatabase(database), &core.BlockChainImpl{}, nil, gspec.Config, chain.Engine(), vm.Config{})
 
 	if err != nil {
 		t.Error(err)
@@ -69,7 +70,7 @@ func TestCommitTransactions(t *testing.T) {
 	)
 
 	gspec.MustCommit(database)
-	chain, _ := core.NewBlockChain(database, state.NewDatabase(database), nil, nil, gspec.Config, vm.Config{})
+	chain, _ := core.NewBlockChain(database, state.NewDatabase(database), nil, nil, gspec.Config, chain.Engine(), vm.Config{})
 
 	// Create a new worker
 	worker := New(params.TestChainConfig, chain, nil)
diff --git a/test/chain/main.go b/test/chain/main.go
index 6da925569..6358e9180 100644
--- a/test/chain/main.go
+++ b/test/chain/main.go
@@ -206,7 +206,7 @@ func playFaucetContract(chain core.BlockChain) {
 
 func main() {
 	genesis := gspec.MustCommit(database)
-	chain, _ := core.NewBlockChain(database, harmonyState.NewDatabase(database), nil, nil, gspec.Config, vm.Config{})
+	chain, _ := core.NewBlockChain(database, harmonyState.NewDatabase(database), nil, nil, gspec.Config, chain.Engine(), vm.Config{})
 	txpool := core.NewTxPool(core.DefaultTxPoolConfig, chainConfig, chain, types.NewTransactionErrorSink())
 
 	backend := &testWorkerBackend{
diff --git a/test/chain/reward/main.go b/test/chain/reward/main.go
index 828c6fc7f..9afdeac39 100644
--- a/test/chain/reward/main.go
+++ b/test/chain/reward/main.go
@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/ethereum/go-ethereum/core/rawdb"
+	"github.com/harmony-one/harmony/internal/chain"
 
 	msg_pb "github.com/harmony-one/harmony/api/proto/message"
 	"github.com/harmony-one/harmony/crypto/bls"
@@ -107,7 +108,8 @@ func main() {
 	database := rawdb.NewMemoryDatabase()
 	genesis := gspec.MustCommit(database)
 	_ = genesis
-	bc, _ := core.NewBlockChain(database, state.NewDatabase(database), nil, nil, gspec.Config, vm.Config{})
+	engine := chain.NewEngine()
+	bc, _ := core.NewBlockChain(database, state.NewDatabase(database), nil, nil, gspec.Config, engine, vm.Config{})
 	statedb, _ := state.New(common2.Hash{}, state.NewDatabase(rawdb.NewMemoryDatabase()))
 	msg := createValidator()
 	statedb.AddBalance(msg.ValidatorAddress, new(big.Int).Mul(big.NewInt(5e18), big.NewInt(2000)))