diff --git a/builder/bootstrap.go b/builder/bootstrap.go
new file mode 100644
index 0000000000..fb745b12e9
--- /dev/null
+++ b/builder/bootstrap.go
@@ -0,0 +1,60 @@
+package builder
+
+import (
+	"context"
+	"errors"
+
+	"github.com/NethermindEth/juno/core"
+	"github.com/NethermindEth/juno/mempool"
+)
+
+// bootstrap submits transactions inside a block directly into the mempool
+// this allows us to bootstrap the network with unsupported transactions
+func (b *Builder) bootstrapChain() error {
+	if b.starknetData == nil {
+		return errors.New("can't bootstrap if the network isn't specified")
+	}
+	for i := 0; i < int(b.bootstrapToBlock); i++ {
+		txns, err := getTxns(b, uint64(i))
+		if err != nil {
+			return err
+		}
+		for _, txn := range txns {
+			b.pool.Push(txn)
+		}
+		if err := b.Finalise(); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func getTxns(builder *Builder, blockNumber uint64) ([]*mempool.BroadcastedTransaction, error) {
+	var mempoolTxns []*mempool.BroadcastedTransaction
+	block, err := builder.starknetData.BlockByNumber(context.Background(), blockNumber)
+	if err != nil {
+		return nil, err
+	}
+	txns := block.Transactions
+	for _, txn := range txns {
+		switch t := txn.(type) {
+		case *core.DeployTransaction, *core.DeployAccountTransaction, *core.InvokeTransaction, *core.L1HandlerTransaction:
+			mempoolTxns = append(mempoolTxns,
+				&mempool.BroadcastedTransaction{
+					Transaction: t,
+				})
+		case *core.DeclareTransaction:
+			class, err := builder.starknetData.Class(context.Background(), t.ClassHash)
+			if err != nil {
+				return nil, err
+			}
+			mempoolTxns = append(mempoolTxns, &mempool.BroadcastedTransaction{
+				Transaction:   t,
+				DeclaredClass: class,
+			})
+		default:
+			return nil, errors.New("unknown transaction")
+		}
+	}
+	return mempoolTxns, nil
+}
diff --git a/builder/builder.go b/builder/builder.go
index d559b39b52..b4bb873269 100644
--- a/builder/builder.go
+++ b/builder/builder.go
@@ -15,6 +15,7 @@ import (
 	"github.com/NethermindEth/juno/feed"
 	"github.com/NethermindEth/juno/mempool"
 	"github.com/NethermindEth/juno/service"
+	"github.com/NethermindEth/juno/starknetdata"
 	"github.com/NethermindEth/juno/sync"
 	"github.com/NethermindEth/juno/utils"
 	"github.com/NethermindEth/juno/vm"
@@ -42,6 +43,10 @@ type Builder struct {
 	pendingBlock blockchain.Pending
 	headState    core.StateReader
 	headCloser   blockchain.StateCloser
+
+	bootstrap        bool
+	bootstrapToBlock uint64
+	starknetData     starknetdata.StarknetData // To bootstrap sequencer
 }
 
 func New(privKey *ecdsa.PrivateKey, ownAddr *felt.Felt, bc *blockchain.Blockchain, builderVM vm.VM,
@@ -66,6 +71,16 @@ func (b *Builder) WithEventListener(l EventListener) *Builder {
 	return b
 }
 
+func (b *Builder) WithBootstrap(bootstrap bool) *Builder {
+	b.bootstrap = bootstrap
+	return b
+}
+
+func (b *Builder) WithStarknetData(starknetData starknetdata.StarknetData) *Builder {
+	b.starknetData = starknetData
+	return b
+}
+
 func (b *Builder) Run(ctx context.Context) error {
 	if err := b.initPendingBlock(); err != nil {
 		return err
@@ -84,6 +99,12 @@ func (b *Builder) Run(ctx context.Context) error {
 		close(doneListen)
 	}()
 
+	if b.bootstrap {
+		if err := b.bootstrapChain(); err != nil {
+			return err
+		}
+	}
+
 	for {
 		select {
 		case <-ctx.Done():
diff --git a/node/node.go b/node/node.go
index 1c3dd35f3c..e047d8590f 100644
--- a/node/node.go
+++ b/node/node.go
@@ -151,22 +151,24 @@ func New(cfg *Config, version string) (*Node, error) { //nolint:gocyclo,funlen
 
 	nodeVM := vm.New(log)
 	throttledVM := NewThrottledVM(nodeVM, cfg.MaxVMs, int32(cfg.MaxVMQueue))
+	client := feeder.NewClient(cfg.Network.FeederURL).WithUserAgent(ua).WithLogger(log).
+		WithTimeout(cfg.GatewayTimeout).WithAPIKey(cfg.GatewayAPIKey)
+	starknetData := adaptfeeder.New(client)
 	var rpcHandler *rpc.Handler
 	if cfg.Sequencer {
 		pKey, kErr := ecdsa.GenerateKey(rand.Reader)
 		if kErr != nil {
 			return nil, kErr
 		}
-
 		poolDB, _ := pebble.NewMem()
 		p := mempool.New(poolDB)
-		sequencer := builder.New(pKey, new(felt.Felt).SetUint64(1337), chain, nodeVM, time.Second*time.Duration(cfg.SeqBlockTime), p, log) //nolint: gomnd
+		sequencer := builder.New(pKey, new(felt.Felt).SetUint64(1337), chain, nodeVM, time.Second*time.Duration(cfg.SeqBlockTime), p, //nolint: gomnd
+			log).WithBootstrap(true).WithStarknetData(starknetData)
 		rpcHandler = rpc.New(chain, sequencer, throttledVM, version, &cfg.Network, log).WithMempool(p)
 		services = append(services, sequencer)
 	} else {
-		client := feeder.NewClient(cfg.Network.FeederURL).WithUserAgent(ua).WithLogger(log).
-			WithTimeout(cfg.GatewayTimeout).WithAPIKey(cfg.GatewayAPIKey)
-		synchronizer := sync.New(chain, adaptfeeder.New(client), log, cfg.PendingPollInterval, dbIsRemote)
+
+		synchronizer := sync.New(chain, starknetData, log, cfg.PendingPollInterval, dbIsRemote)
 		gatewayClient := gateway.NewClient(cfg.Network.GatewayURL, log).WithUserAgent(ua).WithAPIKey(cfg.GatewayAPIKey)
 
 		var p2pService *p2p.Service