diff --git a/dot/core/test_helpers.go b/dot/core/test_helpers.go
index d5cd894efa..fbe1d6bdd8 100644
--- a/dot/core/test_helpers.go
+++ b/dot/core/test_helpers.go
@@ -256,6 +256,10 @@ func (s *mockSyncer) ProcessBlockData(_ []*types.BlockData) (int, error) {
 	return 0, nil
 }
 
+func (s *mockSyncer) ProcessJustification(data []*types.BlockData) (int, error) {
+	return 0, nil
+}
+
 func (s *mockSyncer) IsSynced() bool {
 	return false
 }
diff --git a/dot/network/host.go b/dot/network/host.go
index 12c4a386ba..89728ff907 100644
--- a/dot/network/host.go
+++ b/dot/network/host.go
@@ -257,7 +257,7 @@ func (h *host) bootstrap() {
 			failed++
 		}
 	}
-	if failed == len(all) {
+	if failed == len(all) && len(all) != 0 {
 		logger.Error("failed to bootstrap to any bootnode")
 	}
 }
diff --git a/dot/network/state.go b/dot/network/state.go
index 72a4831e35..70b948d11f 100644
--- a/dot/network/state.go
+++ b/dot/network/state.go
@@ -38,6 +38,8 @@ type Syncer interface {
 	// CreateBlockResponse is called upon receipt of a BlockRequestMessage to create the response
 	CreateBlockResponse(*BlockRequestMessage) (*BlockResponseMessage, error)
 
+	ProcessJustification(data []*types.BlockData) (int, error)
+
 	// ProcessBlockData is called to process BlockData received in a BlockResponseMessage
 	ProcessBlockData(data []*types.BlockData) (int, error)
 
diff --git a/dot/network/sync.go b/dot/network/sync.go
index fcea04e37d..0f588932fe 100644
--- a/dot/network/sync.go
+++ b/dot/network/sync.go
@@ -474,6 +474,7 @@ func (q *syncQueue) pushResponse(resp *BlockResponseMessage, pid peer.ID) error
 		}
 
 		if numJustifications == 0 {
+			logger.Debug("got empty justification data", "start hash", startHash)
 			return errEmptyJustificationData
 		}
 
@@ -484,7 +485,7 @@ func (q *syncQueue) pushResponse(resp *BlockResponseMessage, pid peer.ID) error
 			from:     pid,
 		})
 
-		logger.Info("pushed justification data to queue", "hash", startHash)
+		logger.Debug("pushed justification data to queue", "hash", startHash)
 		q.responseCh <- justificationResponses
 		return nil
 	}
@@ -668,7 +669,7 @@ func (q *syncQueue) handleBlockJustification(data []*types.BlockData) {
 	startHash, endHash := data[0].Hash, data[len(data)-1].Hash
 	logger.Debug("sending justification data to syncer", "start", startHash, "end", endHash)
 
-	_, err := q.s.syncer.ProcessBlockData(data)
+	_, err := q.s.syncer.ProcessJustification(data)
 	if err != nil {
 		logger.Warn("failed to handle block justifications", "error", err)
 		return
@@ -792,6 +793,7 @@ func (q *syncQueue) handleBlockAnnounceHandshake(blockNum uint32, from peer.ID)
 
 func (q *syncQueue) handleBlockAnnounce(msg *BlockAnnounceMessage, from peer.ID) {
 	q.updatePeerScore(from, 1)
+	logger.Info("received BlockAnnounce", "number", msg.Number, "from", from)
 
 	header, err := types.NewHeader(msg.ParentHash, msg.StateRoot, msg.ExtrinsicsRoot, msg.Number, msg.Digest)
 	if err != nil {
diff --git a/dot/network/sync_justification.go b/dot/network/sync_justification.go
index e0897d0d10..2015afb576 100644
--- a/dot/network/sync_justification.go
+++ b/dot/network/sync_justification.go
@@ -18,62 +18,19 @@ package network
 
 import (
 	"math/big"
-	"time"
-)
-
-func (q *syncQueue) finalizeAtHead() {
-	prev, err := q.s.blockState.GetFinalizedHeader(0, 0)
-	if err != nil {
-		logger.Error("failed to get latest finalized block header", "error", err)
-		return
-	}
-
-	for {
-		select {
-		// sleep for average block time TODO: make this configurable from slot duration
-		case <-time.After(q.slotDuration * 2):
-		case <-q.ctx.Done():
-			return
-		}
-
-		head, err := q.s.blockState.BestBlockNumber()
-		if err != nil {
-			continue
-		}
 
-		if head.Int64() < q.goal {
-			continue
-		}
-
-		curr, err := q.s.blockState.GetFinalizedHeader(0, 0)
-		if err != nil {
-			continue
-		}
-
-		logger.Debug("checking finalized blocks", "curr", curr.Number, "prev", prev.Number)
-
-		if curr.Number.Cmp(prev.Number) > 0 {
-			prev = curr
-			continue
-		}
-
-		prev = curr
-
-		start := head.Uint64() - uint64(blockRequestSize)
-		if curr.Number.Uint64() > start {
-			start = curr.Number.Uint64() + 1
-		} else if int(start) < int(blockRequestSize) {
-			start = 1
-		}
+	"github.com/libp2p/go-libp2p-core/peer"
+)
 
-		q.pushJustificationRequest(start)
-	}
+// SendJustificationRequest pushes a justification request to the queue to be sent out to the network
+func (s *Service) SendJustificationRequest(to peer.ID, num uint32) {
+	s.syncQueue.pushJustificationRequest(to, uint64(num))
 }
 
-func (q *syncQueue) pushJustificationRequest(start uint64) {
+func (q *syncQueue) pushJustificationRequest(to peer.ID, start uint64) {
 	startHash, err := q.s.blockState.GetHashByNumber(big.NewInt(int64(start)))
 	if err != nil {
-		logger.Error("failed to get hash for block w/ number", "number", start, "error", err)
+		logger.Debug("failed to get hash for block w/ number", "number", start, "error", err)
 		return
 	}
 
@@ -87,6 +44,6 @@ func (q *syncQueue) pushJustificationRequest(start uint64) {
 
 	q.requestCh <- &syncRequest{
 		req: req,
-		to:  "",
+		to:  to,
 	}
 }
diff --git a/dot/network/sync_justification_test.go b/dot/network/sync_justification_test.go
index 00d854471a..bcb791d9bc 100644
--- a/dot/network/sync_justification_test.go
+++ b/dot/network/sync_justification_test.go
@@ -18,7 +18,6 @@ package network
 
 import (
 	"context"
-	"math/big"
 	"testing"
 	"time"
 
@@ -135,34 +134,3 @@ func TestSyncQueue_processBlockResponses_Justification(t *testing.T) {
 	require.True(t, ok)
 	require.Equal(t, 2, score)
 }
-
-func TestSyncQueue_finalizeAtHead(t *testing.T) {
-	q := newTestSyncQueue(t)
-	q.stop()
-	time.Sleep(time.Second)
-	q.ctx = context.Background()
-	q.slotDuration = time.Millisecond * 200
-
-	hash, err := q.s.blockState.GetHashByNumber(big.NewInt(1))
-	require.NoError(t, err)
-
-	go q.finalizeAtHead()
-	time.Sleep(time.Second)
-
-	data, has := q.justificationRequestData.Load(hash)
-	require.True(t, has)
-	require.Equal(t, requestData{}, data)
-
-	expected := createBlockRequestWithHash(hash, blockRequestSize)
-	expected.RequestedData = RequestedDataJustification
-
-	select {
-	case req := <-q.requestCh:
-		require.Equal(t, &syncRequest{
-			req: expected,
-			to:  "",
-		}, req)
-	case <-time.After(time.Second):
-		t.Fatal("did not receive request")
-	}
-}
diff --git a/dot/network/test_helpers.go b/dot/network/test_helpers.go
index 7659867268..06c97ef3aa 100644
--- a/dot/network/test_helpers.go
+++ b/dot/network/test_helpers.go
@@ -61,6 +61,10 @@ func (s *mockSyncer) ProcessBlockData(data []*types.BlockData) (int, error) {
 	return 0, nil
 }
 
+func (s *mockSyncer) ProcessJustification(data []*types.BlockData) (int, error) {
+	return 0, nil
+}
+
 func (s *mockSyncer) IsSynced() bool {
 	return s.synced
 }
diff --git a/dot/node.go b/dot/node.go
index cc11ef1330..8038119e77 100644
--- a/dot/node.go
+++ b/dot/node.go
@@ -125,7 +125,7 @@ func NodeInitialized(basepath string, expected bool) bool {
 	_, err := os.Stat(registry)
 	if os.IsNotExist(err) {
 		if expected {
-			logger.Warn(
+			logger.Debug(
 				"node has not been initialized",
 				"basepath", basepath,
 				"error", "failed to locate KEYREGISTRY file in data directory",
@@ -242,12 +242,6 @@ func NewNode(cfg *Config, ks *keystore.GlobalKeystore, stopFunc func()) (*Node,
 		return nil, err
 	}
 
-	// Syncer
-	syncer, err := createSyncService(cfg, stateSrvc, bp, dh, ver, rt)
-	if err != nil {
-		return nil, err
-	}
-
 	// create GRANDPA service
 	fg, err := createGRANDPAService(cfg, rt, stateSrvc, dh, ks.Gran, networkSrvc)
 	if err != nil {
@@ -256,6 +250,12 @@ func NewNode(cfg *Config, ks *keystore.GlobalKeystore, stopFunc func()) (*Node,
 	nodeSrvcs = append(nodeSrvcs, fg)
 	dh.SetFinalityGadget(fg) // TODO: this should be cleaned up
 
+	// Syncer
+	syncer, err := createSyncService(cfg, stateSrvc, bp, fg, dh, ver, rt)
+	if err != nil {
+		return nil, err
+	}
+
 	// Core Service
 
 	// create core service and append core service to node services
diff --git a/dot/rpc/modules/system_test.go b/dot/rpc/modules/system_test.go
index 98c52935a1..a632029709 100644
--- a/dot/rpc/modules/system_test.go
+++ b/dot/rpc/modules/system_test.go
@@ -51,6 +51,10 @@ func (s *mockSyncer) ProcessBlockData(_ []*types.BlockData) (int, error) {
 	return 0, nil
 }
 
+func (s *mockSyncer) ProcessJustification(_ []*types.BlockData) (int, error) {
+	return 0, nil
+}
+
 func (s *mockSyncer) HandleBlockAnnounce(msg *network.BlockAnnounceMessage) error {
 	return nil
 }
diff --git a/dot/services.go b/dot/services.go
index 0f5d329dbc..e523b88d5d 100644
--- a/dot/services.go
+++ b/dot/services.go
@@ -381,13 +381,14 @@ func createBlockVerifier(st *state.Service) (*babe.VerificationManager, error) {
 	return ver, nil
 }
 
-func createSyncService(cfg *Config, st *state.Service, bp sync.BlockProducer, dh *core.DigestHandler, verifier *babe.VerificationManager, rt runtime.Instance) (*sync.Service, error) {
+func createSyncService(cfg *Config, st *state.Service, bp sync.BlockProducer, fg sync.FinalityGadget, dh *core.DigestHandler, verifier *babe.VerificationManager, rt runtime.Instance) (*sync.Service, error) {
 	syncCfg := &sync.Config{
 		LogLvl:           cfg.Log.SyncLvl,
 		BlockState:       st.Block,
 		StorageState:     st.Storage,
 		TransactionState: st.Transaction,
 		BlockProducer:    bp,
+		FinalityGadget:   fg,
 		Verifier:         verifier,
 		Runtime:          rt,
 		DigestHandler:    dh,
diff --git a/dot/services_test.go b/dot/services_test.go
index 91f55d2d09..e5338c7251 100644
--- a/dot/services_test.go
+++ b/dot/services_test.go
@@ -148,7 +148,7 @@ func TestCreateSyncService(t *testing.T) {
 	ver, err := createBlockVerifier(stateSrvc)
 	require.NoError(t, err)
 
-	_, err = createSyncService(cfg, stateSrvc, nil, nil, ver, rt)
+	_, err = createSyncService(cfg, stateSrvc, nil, nil, nil, ver, rt)
 	require.NoError(t, err)
 }
 
diff --git a/dot/state/service.go b/dot/state/service.go
index 6fb9ebdc2c..67839c740d 100644
--- a/dot/state/service.go
+++ b/dot/state/service.go
@@ -350,6 +350,11 @@ func (s *Service) Rewind(toBlock int64) error {
 		return err
 	}
 
+	err = s.Block.SetFinalizedHash(header.Hash(), 0, 0)
+	if err != nil {
+		return err
+	}
+
 	return StoreBestBlockHash(s.db, newHead)
 }
 
diff --git a/dot/sync/interface.go b/dot/sync/interface.go
index 1a457091e2..83bd9aa2ca 100644
--- a/dot/sync/interface.go
+++ b/dot/sync/interface.go
@@ -78,3 +78,8 @@ type DigestHandler interface {
 type Verifier interface {
 	VerifyBlock(header *types.Header) error
 }
+
+// FinalityGadget implements justification verification functionality
+type FinalityGadget interface {
+	VerifyBlockJustification([]byte) error
+}
diff --git a/dot/sync/syncer.go b/dot/sync/syncer.go
index 088da86ae5..e92b4e7461 100644
--- a/dot/sync/syncer.go
+++ b/dot/sync/syncer.go
@@ -44,6 +44,7 @@ type Service struct {
 	storageState     StorageState
 	transactionState TransactionState
 	blockProducer    BlockProducer
+	finalityGadget   FinalityGadget
 
 	// Synchronization variables
 	synced           bool
@@ -63,6 +64,7 @@ type Config struct {
 	BlockState       BlockState
 	StorageState     StorageState
 	BlockProducer    BlockProducer
+	FinalityGadget   FinalityGadget
 	TransactionState TransactionState
 	Runtime          runtime.Instance
 	Verifier         Verifier
@@ -105,6 +107,7 @@ func NewService(cfg *Config) (*Service, error) {
 		blockState:       cfg.BlockState,
 		storageState:     cfg.StorageState,
 		blockProducer:    cfg.BlockProducer,
+		finalityGadget:   cfg.FinalityGadget,
 		synced:           true,
 		highestSeenBlock: big.NewInt(0),
 		transactionState: cfg.TransactionState,
@@ -149,6 +152,27 @@ func (s *Service) HandleBlockAnnounce(msg *network.BlockAnnounceMessage) error {
 	return nil
 }
 
+// ProcessJustification processes block data containing justifications
+func (s *Service) ProcessJustification(data []*types.BlockData) (int, error) {
+	if len(data) == 0 {
+		return 0, ErrNilBlockData
+	}
+
+	for i, bd := range data {
+		header, err := s.blockState.GetHeader(bd.Hash)
+		if err != nil {
+			return i, err
+		}
+
+		if bd.Justification != nil && bd.Justification.Exists() {
+			logger.Debug("handling Justification...", "number", header.Number, "hash", bd.Hash)
+			s.handleJustification(header, bd.Justification.Value())
+		}
+	}
+
+	return 0, nil
+}
+
 // ProcessBlockData processes the BlockData from a BlockResponse and returns the index of the last BlockData it handled on success,
 // or the index of the block data that errored on failure.
 func (s *Service) ProcessBlockData(data []*types.BlockData) (int, error) {
@@ -351,7 +375,13 @@ func (s *Service) handleJustification(header *types.Header, justification []byte
 		return
 	}
 
-	err := s.blockState.SetFinalizedHash(header.Hash(), 0, 0)
+	err := s.finalityGadget.VerifyBlockJustification(justification)
+	if err != nil {
+		logger.Warn("failed to verify block justification", "hash", header.Hash(), "number", header.Number, "error", err)
+		return
+	}
+
+	err = s.blockState.SetFinalizedHash(header.Hash(), 0, 0)
 	if err != nil {
 		logger.Error("failed to set finalized hash", "error", err)
 		return
diff --git a/dot/sync/syncer_test.go b/dot/sync/syncer_test.go
index 6872732975..eeafd7f6ea 100644
--- a/dot/sync/syncer_test.go
+++ b/dot/sync/syncer_test.go
@@ -27,6 +27,7 @@ import (
 	"github.com/ChainSafe/gossamer/dot/state"
 	"github.com/ChainSafe/gossamer/dot/types"
 	"github.com/ChainSafe/gossamer/lib/common"
+	"github.com/ChainSafe/gossamer/lib/common/optional"
 	"github.com/ChainSafe/gossamer/lib/common/variadic"
 	"github.com/ChainSafe/gossamer/lib/genesis"
 	"github.com/ChainSafe/gossamer/lib/runtime"
@@ -41,6 +42,12 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+type mockFinalityGadget struct{}
+
+func (m mockFinalityGadget) VerifyBlockJustification(_ []byte) error {
+	return nil
+}
+
 func newTestGenesisWithTrieAndHeader(t *testing.T) (*genesis.Genesis, *trie.Trie, *types.Header) {
 	gen, err := genesis.NewGenesisFromJSONRaw("../../chain/gssmr/genesis.json")
 	require.NoError(t, err)
@@ -102,6 +109,10 @@ func newTestSyncer(t *testing.T) *Service {
 		cfg.LogLvl = log.LvlDebug
 	}
 
+	if cfg.FinalityGadget == nil {
+		cfg.FinalityGadget = &mockFinalityGadget{}
+	}
+
 	syncer, err := NewService(cfg)
 	require.NoError(t, err)
 	return syncer
@@ -352,3 +363,29 @@ func TestSyncer_HandleJustification(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, just, res)
 }
+
+func TestSyncer_ProcessJustification(t *testing.T) {
+	syncer := newTestSyncer(t)
+
+	parent, err := syncer.blockState.(*state.BlockState).BestBlockHeader()
+	require.NoError(t, err)
+	block := buildBlock(t, syncer.runtime, parent)
+	err = syncer.blockState.(*state.BlockState).AddBlock(block)
+	require.NoError(t, err)
+
+	just := []byte("testjustification")
+
+	data := []*types.BlockData{
+		{
+			Hash:          syncer.blockState.BestBlockHash(),
+			Justification: optional.NewBytes(true, just),
+		},
+	}
+
+	_, err = syncer.ProcessJustification(data)
+	require.NoError(t, err)
+
+	res, err := syncer.blockState.GetJustification(syncer.blockState.BestBlockHash())
+	require.NoError(t, err)
+	require.Equal(t, just, res)
+}
diff --git a/lib/grandpa/grandpa.go b/lib/grandpa/grandpa.go
index 79fddf33cd..bb4feabc73 100644
--- a/lib/grandpa/grandpa.go
+++ b/lib/grandpa/grandpa.go
@@ -60,8 +60,8 @@ type Service struct {
 	state            *State                             // current state
 	prevotes         map[ed25519.PublicKeyBytes]*Vote   // pre-votes for the current round
 	precommits       map[ed25519.PublicKeyBytes]*Vote   // pre-commits for the current round
-	pvJustifications map[common.Hash][]*Justification   // pre-vote justifications for the current round
-	pcJustifications map[common.Hash][]*Justification   // pre-commit justifications for the current round
+	pvJustifications map[common.Hash][]*SignedPrecommit // pre-vote justifications for the current round
+	pcJustifications map[common.Hash][]*SignedPrecommit // pre-commit justifications for the current round
 	pvEquivocations  map[ed25519.PublicKeyBytes][]*Vote // equivocatory votes for current pre-vote stage
 	pcEquivocations  map[ed25519.PublicKeyBytes][]*Vote // equivocatory votes for current pre-commit stage
 	tracker          *tracker                           // tracker of vote messages we may need in the future
@@ -69,9 +69,9 @@ type Service struct {
 	nextAuthorities  []*Voter                           // if not nil, the updated authorities for the next round
 
 	// historical information
-	preVotedBlock      map[uint64]*Vote            // map of round number -> pre-voted block
-	bestFinalCandidate map[uint64]*Vote            // map of round number -> best final candidate
-	justification      map[uint64][]*Justification // map of round number -> precommit round justification
+	preVotedBlock      map[uint64]*Vote              // map of round number -> pre-voted block
+	bestFinalCandidate map[uint64]*Vote              // map of round number -> best final candidate
+	justification      map[uint64][]*SignedPrecommit // map of round number -> precommit round justification
 
 	// channels for communication with other services
 	in chan GrandpaMessage // only used to receive *VoteMessage
@@ -136,13 +136,13 @@ func NewService(cfg *Config) (*Service, error) {
 		authority:          cfg.Authority,
 		prevotes:           make(map[ed25519.PublicKeyBytes]*Vote),
 		precommits:         make(map[ed25519.PublicKeyBytes]*Vote),
-		pvJustifications:   make(map[common.Hash][]*Justification),
-		pcJustifications:   make(map[common.Hash][]*Justification),
+		pvJustifications:   make(map[common.Hash][]*SignedPrecommit),
+		pcJustifications:   make(map[common.Hash][]*SignedPrecommit),
 		pvEquivocations:    make(map[ed25519.PublicKeyBytes][]*Vote),
 		pcEquivocations:    make(map[ed25519.PublicKeyBytes][]*Vote),
 		preVotedBlock:      make(map[uint64]*Vote),
 		bestFinalCandidate: make(map[uint64]*Vote),
-		justification:      make(map[uint64][]*Justification),
+		justification:      make(map[uint64][]*SignedPrecommit),
 		head:               head,
 		in:                 make(chan GrandpaMessage, 128),
 		resumed:            make(chan struct{}),
@@ -256,10 +256,10 @@ func (s *Service) initiate() error {
 		var err error
 		s.prevotes = make(map[ed25519.PublicKeyBytes]*Vote)
 		s.precommits = make(map[ed25519.PublicKeyBytes]*Vote)
-		s.pcJustifications = make(map[common.Hash][]*Justification)
+		s.pcJustifications = make(map[common.Hash][]*SignedPrecommit)
 		s.pvEquivocations = make(map[ed25519.PublicKeyBytes][]*Vote)
 		s.pcEquivocations = make(map[ed25519.PublicKeyBytes][]*Vote)
-		s.justification = make(map[uint64][]*Justification)
+		s.justification = make(map[uint64][]*SignedPrecommit)
 
 		s.tracker, err = newTracker(s.blockState, s.in)
 		if err != nil {
@@ -535,7 +535,7 @@ func (s *Service) playGrandpaRound() error {
 				return false
 			}
 
-			if completable && finalizable && uint64(s.head.Number.Int64()) >= prevBfc.number {
+			if completable && finalizable && uint32(s.head.Number.Int64()) >= prevBfc.number {
 				return true
 			}
 
@@ -574,7 +574,7 @@ func (s *Service) attemptToFinalize() error {
 		return err
 	}
 
-	if bfc.number >= uint64(s.head.Number.Int64()) && pc >= s.state.threshold() {
+	if bfc.number >= uint32(s.head.Number.Int64()) && pc >= s.state.threshold() {
 		err = s.finalize()
 		if err != nil {
 			return err
@@ -608,7 +608,7 @@ func (s *Service) determinePreVote() (*Vote, error) {
 	prm := s.prevotes[s.derivePrimary().PublicKeyBytes()]
 	s.mapLock.Unlock()
 
-	if prm != nil && prm.number >= uint64(s.head.Number.Int64()) {
+	if prm != nil && prm.number >= uint32(s.head.Number.Int64()) {
 		vote = prm
 	} else {
 		header, err := s.blockState.BestBlockHeader()
@@ -620,7 +620,7 @@ func (s *Service) determinePreVote() (*Vote, error) {
 	}
 
 	nextChange := s.digestHandler.NextGrandpaAuthorityChange()
-	if vote.number > nextChange {
+	if uint64(vote.number) > nextChange {
 		header, err := s.blockState.GetHeaderByNumber(big.NewInt(int64(nextChange)))
 		if err != nil {
 			return nil, err
@@ -645,7 +645,7 @@ func (s *Service) determinePreCommit() (*Vote, error) {
 	s.mapLock.Unlock()
 
 	nextChange := s.digestHandler.NextGrandpaAuthorityChange()
-	if pvb.number > nextChange {
+	if uint64(pvb.number) > nextChange {
 		header, err := s.blockState.GetHeaderByNumber(big.NewInt(int64(nextChange)))
 		if err != nil {
 			return nil, err
@@ -728,12 +728,12 @@ func (s *Service) finalize() error {
 	// set justification
 	s.justification[s.state.round] = s.pcJustifications[bfc.hash]
 
-	pvj, err := newFullJustification(s.pvJustifications[bfc.hash]).Encode()
+	pvj, err := newJustification(s.state.round, bfc.hash, bfc.number, s.pvJustifications[bfc.hash]).Encode()
 	if err != nil {
 		return err
 	}
 
-	pcj, err := newFullJustification(s.pcJustifications[bfc.hash]).Encode()
+	pcj, err := newJustification(s.state.round, bfc.hash, bfc.number, s.pcJustifications[bfc.hash]).Encode()
 	if err != nil {
 		return err
 	}
@@ -897,7 +897,7 @@ func (s *Service) getPreVotedBlock() (Vote, error) {
 
 	// if there are multiple, find the one with the highest number and return it
 	highest := Vote{
-		number: uint64(0),
+		number: uint32(0),
 	}
 	for h, n := range blocks {
 		if n > highest.number {
@@ -916,7 +916,7 @@ func (s *Service) getPreVotedBlock() (Vote, error) {
 func (s *Service) getGrandpaGHOST() (Vote, error) {
 	threshold := s.state.threshold()
 
-	var blocks map[common.Hash]uint64
+	var blocks map[common.Hash]uint32
 	var err error
 
 	for {
@@ -937,7 +937,7 @@ func (s *Service) getGrandpaGHOST() (Vote, error) {
 
 	// if there are multiple, find the one with the highest number and return it
 	highest := Vote{
-		number: uint64(0),
+		number: uint32(0),
 	}
 	for h, n := range blocks {
 		if n > highest.number {
@@ -957,10 +957,10 @@ func (s *Service) getGrandpaGHOST() (Vote, error) {
 // thus, if there are no blocks with >=threshold total votes, but the sum of votes for blocks A and B is >=threshold, then this function returns
 // the first common ancestor of A and B.
 // in general, this function will return the highest block on each chain with >=threshold votes.
-func (s *Service) getPossibleSelectedBlocks(stage subround, threshold uint64) (map[common.Hash]uint64, error) {
+func (s *Service) getPossibleSelectedBlocks(stage subround, threshold uint64) (map[common.Hash]uint32, error) {
 	// get blocks that were directly voted for
 	votes := s.getDirectVotes(stage)
-	blocks := make(map[common.Hash]uint64)
+	blocks := make(map[common.Hash]uint32)
 
 	// check if any of them have >=threshold votes
 	for v := range votes {
@@ -996,7 +996,7 @@ func (s *Service) getPossibleSelectedBlocks(stage subround, threshold uint64) (m
 
 // getPossibleSelectedAncestors recursively searches for ancestors with >=2/3 votes
 // it returns a map of block hash -> number, such that the blocks in the map have >=2/3 votes
-func (s *Service) getPossibleSelectedAncestors(votes []Vote, curr common.Hash, selected map[common.Hash]uint64, stage subround, threshold uint64) (map[common.Hash]uint64, error) {
+func (s *Service) getPossibleSelectedAncestors(votes []Vote, curr common.Hash, selected map[common.Hash]uint32, stage subround, threshold uint64) (map[common.Hash]uint32, error) {
 	for _, v := range votes {
 		if v.hash == curr {
 			continue
@@ -1026,7 +1026,7 @@ func (s *Service) getPossibleSelectedAncestors(votes []Vote, curr common.Hash, s
 				return nil, err
 			}
 
-			selected[pred] = uint64(h.Number.Int64())
+			selected[pred] = uint32(h.Number.Int64())
 		} else {
 			selected, err = s.getPossibleSelectedAncestors(votes, pred, selected, stage, threshold)
 			if err != nil {
@@ -1123,7 +1123,7 @@ func (s *Service) getVotes(stage subround) []Vote {
 }
 
 // findParentWithNumber returns a Vote for an ancestor with number n given an existing Vote
-func (s *Service) findParentWithNumber(v *Vote, n uint64) (*Vote, error) {
+func (s *Service) findParentWithNumber(v *Vote, n uint32) (*Vote, error) {
 	if v.number <= n {
 		return v, nil
 	}
diff --git a/lib/grandpa/grandpa_test.go b/lib/grandpa/grandpa_test.go
index e1eaebfc39..3beab53b47 100644
--- a/lib/grandpa/grandpa_test.go
+++ b/lib/grandpa/grandpa_test.go
@@ -263,8 +263,8 @@ func TestGetPossibleSelectedAncestors_SameAncestor(t *testing.T) {
 	}
 
 	votes := gs.getVotes(prevote)
-	prevoted := make(map[common.Hash]uint64)
-	var blocks map[common.Hash]uint64
+	prevoted := make(map[common.Hash]uint32)
+	var blocks map[common.Hash]uint32
 
 	for _, curr := range leaves {
 		blocks, err = gs.getPossibleSelectedAncestors(votes, curr, prevoted, prevote, gs.state.threshold())
@@ -277,7 +277,7 @@ func TestGetPossibleSelectedAncestors_SameAncestor(t *testing.T) {
 	// this should return the highest common ancestor of (a, b, c) with >=2/3 votes,
 	// which is the node at depth 6.
 	require.Equal(t, 1, len(blocks))
-	require.Equal(t, uint64(6), blocks[expected])
+	require.Equal(t, uint32(6), blocks[expected])
 }
 
 func TestGetPossibleSelectedAncestors_VaryingAncestor(t *testing.T) {
@@ -313,8 +313,8 @@ func TestGetPossibleSelectedAncestors_VaryingAncestor(t *testing.T) {
 	}
 
 	votes := gs.getVotes(prevote)
-	prevoted := make(map[common.Hash]uint64)
-	var blocks map[common.Hash]uint64
+	prevoted := make(map[common.Hash]uint32)
+	var blocks map[common.Hash]uint32
 
 	for _, curr := range leaves {
 		blocks, err = gs.getPossibleSelectedAncestors(votes, curr, prevoted, prevote, gs.state.threshold())
@@ -330,8 +330,8 @@ func TestGetPossibleSelectedAncestors_VaryingAncestor(t *testing.T) {
 	// this should return the highest common ancestor of (a, b) and (b, c) with >=2/3 votes,
 	// which are the nodes at depth 6 and 7.
 	require.Equal(t, 2, len(blocks))
-	require.Equal(t, uint64(6), blocks[expectedAt6])
-	require.Equal(t, uint64(7), blocks[expectedAt7])
+	require.Equal(t, uint32(6), blocks[expectedAt6])
+	require.Equal(t, uint32(7), blocks[expectedAt7])
 }
 
 func TestGetPossibleSelectedAncestors_VaryingAncestor_MoreBranches(t *testing.T) {
@@ -373,8 +373,8 @@ func TestGetPossibleSelectedAncestors_VaryingAncestor_MoreBranches(t *testing.T)
 	}
 
 	votes := gs.getVotes(prevote)
-	prevoted := make(map[common.Hash]uint64)
-	var blocks map[common.Hash]uint64
+	prevoted := make(map[common.Hash]uint32)
+	var blocks map[common.Hash]uint32
 
 	for _, curr := range leaves {
 		blocks, err = gs.getPossibleSelectedAncestors(votes, curr, prevoted, prevote, gs.state.threshold())
@@ -390,8 +390,8 @@ func TestGetPossibleSelectedAncestors_VaryingAncestor_MoreBranches(t *testing.T)
 	// this should return the highest common ancestor of (a, b) and (b, c) with >=2/3 votes,
 	// which are the nodes at depth 6 and 7.
 	require.Equal(t, 2, len(blocks))
-	require.Equal(t, uint64(6), blocks[expectedAt6])
-	require.Equal(t, uint64(7), blocks[expectedAt7])
+	require.Equal(t, uint32(6), blocks[expectedAt6])
+	require.Equal(t, uint32(7), blocks[expectedAt7])
 }
 
 func TestGetPossibleSelectedBlocks_OneBlock(t *testing.T) {
@@ -462,7 +462,7 @@ func TestGetPossibleSelectedBlocks_EqualVotes_SameAncestor(t *testing.T) {
 
 	// this should return the highest common ancestor of (a, b, c)
 	require.Equal(t, 1, len(blocks))
-	require.Equal(t, uint64(6), blocks[expected])
+	require.Equal(t, uint32(6), blocks[expected])
 }
 
 func TestGetPossibleSelectedBlocks_EqualVotes_VaryingAncestor(t *testing.T) {
@@ -509,8 +509,8 @@ func TestGetPossibleSelectedBlocks_EqualVotes_VaryingAncestor(t *testing.T) {
 	// this should return the highest common ancestor of (a, b) and (b, c) with >=2/3 votes,
 	// which are the nodes at depth 6 and 7.
 	require.Equal(t, 2, len(blocks))
-	require.Equal(t, uint64(6), blocks[expectedAt6])
-	require.Equal(t, uint64(7), blocks[expectedAt7])
+	require.Equal(t, uint32(6), blocks[expectedAt6])
+	require.Equal(t, uint32(7), blocks[expectedAt7])
 }
 
 func TestGetPossibleSelectedBlocks_OneThirdEquivocating(t *testing.T) {
@@ -651,7 +651,7 @@ func TestGetPreVotedBlock_MultipleCandidates(t *testing.T) {
 	block, err := gs.getPreVotedBlock()
 	require.NoError(t, err)
 	require.Equal(t, expected, block.hash)
-	require.Equal(t, uint64(7), block.number)
+	require.Equal(t, uint32(7), block.number)
 }
 
 func TestGetPreVotedBlock_EvenMoreCandidates(t *testing.T) {
@@ -714,7 +714,7 @@ func TestGetPreVotedBlock_EvenMoreCandidates(t *testing.T) {
 	block, err := gs.getPreVotedBlock()
 	require.NoError(t, err)
 	require.Equal(t, expected, block.hash)
-	require.Equal(t, uint64(5), block.number)
+	require.Equal(t, uint32(5), block.number)
 }
 
 func TestIsCompletable(t *testing.T) {
@@ -1083,7 +1083,7 @@ func TestGetGrandpaGHOST_MultipleCandidates(t *testing.T) {
 	block, err := gs.getGrandpaGHOST()
 	require.NoError(t, err)
 	require.Equal(t, expected, block.hash)
-	require.Equal(t, uint64(3), block.number)
+	require.Equal(t, uint32(3), block.number)
 
 	pv, err := gs.getPreVotedBlock()
 	require.NoError(t, err)
diff --git a/lib/grandpa/message.go b/lib/grandpa/message.go
index 9e68c30538..0b76d4603d 100644
--- a/lib/grandpa/message.go
+++ b/lib/grandpa/message.go
@@ -55,7 +55,7 @@ type FullVote struct {
 // SignedMessage represents a block hash and number signed by an authority
 type SignedMessage struct {
 	Hash        common.Hash
-	Number      uint64
+	Number      uint32
 	Signature   [64]byte // ed25519.SignatureLength
 	AuthorityID ed25519.PublicKeyBytes
 }
@@ -121,7 +121,7 @@ func (m *NeighbourMessage) Type() byte {
 type FinalizationMessage struct {
 	Round         uint64
 	Vote          *Vote
-	Justification []*Justification
+	Justification []*SignedPrecommit
 }
 
 // Type returns finalizationType
@@ -181,10 +181,10 @@ func (r *catchUpRequest) ToConsensusMessage() (*ConsensusMessage, error) {
 type catchUpResponse struct {
 	Round                  uint64
 	SetID                  uint64
-	PreVoteJustification   FullJustification
-	PreCommitJustification FullJustification
+	PreVoteJustification   []*SignedPrecommit
+	PreCommitJustification []*SignedPrecommit
 	Hash                   common.Hash
-	Number                 uint64
+	Number                 uint32
 }
 
 func (s *Service) newCatchUpResponse(round, setID uint64) (*catchUpResponse, error) {
@@ -208,20 +208,23 @@ func (s *Service) newCatchUpResponse(round, setID uint64) (*catchUpResponse, err
 	}
 
 	r := &bytes.Buffer{}
+	sd := &scale.Decoder{Reader: r}
 	_, err = r.Write(just)
 	if err != nil {
 		return nil, err
 	}
 
-	pvj, err := FullJustification{}.Decode(r)
+	d, err := sd.Decode([]*SignedPrecommit{})
 	if err != nil {
 		return nil, err
 	}
+	pvj := d.([]*SignedPrecommit)
 
-	pcj, err := FullJustification{}.Decode(r)
+	d, err = sd.Decode([]*SignedPrecommit{})
 	if err != nil {
 		return nil, err
 	}
+	pcj := d.([]*SignedPrecommit)
 
 	return &catchUpResponse{
 		Round:                  round,
@@ -229,7 +232,7 @@ func (s *Service) newCatchUpResponse(round, setID uint64) (*catchUpResponse, err
 		PreVoteJustification:   pvj,
 		PreCommitJustification: pcj,
 		Hash:                   header.Hash(),
-		Number:                 header.Number.Uint64(),
+		Number:                 uint32(header.Number.Uint64()),
 	}, nil
 }
 
diff --git a/lib/grandpa/message_handler.go b/lib/grandpa/message_handler.go
index 9fac06081e..2d31704b56 100644
--- a/lib/grandpa/message_handler.go
+++ b/lib/grandpa/message_handler.go
@@ -17,32 +17,39 @@
 package grandpa
 
 import (
+	"bytes"
 	"math/big"
 	"reflect"
+	"sync"
 
+	"github.com/ChainSafe/gossamer/dot/network"
 	"github.com/ChainSafe/gossamer/lib/common"
 	"github.com/ChainSafe/gossamer/lib/crypto/ed25519"
 	"github.com/ChainSafe/gossamer/lib/scale"
+
+	"github.com/libp2p/go-libp2p-core/peer"
 )
 
 // MessageHandler handles GRANDPA consensus messages
 type MessageHandler struct {
-	grandpa    *Service
-	blockState BlockState
+	grandpa         *Service
+	blockState      BlockState
+	blockNumToSetID *sync.Map // map[uint32]uint64
 }
 
 // NewMessageHandler returns a new MessageHandler
 func NewMessageHandler(grandpa *Service, blockState BlockState) *MessageHandler {
 	return &MessageHandler{
-		grandpa:    grandpa,
-		blockState: blockState,
+		grandpa:         grandpa,
+		blockState:      blockState,
+		blockNumToSetID: new(sync.Map),
 	}
 }
 
 // HandleMessage handles a GRANDPA consensus message
 // if it is a FinalizationMessage, it updates the BlockState
 // if it is a VoteMessage, it sends it to the GRANDPA service
-func (h *MessageHandler) handleMessage(msg *ConsensusMessage) (*ConsensusMessage, error) {
+func (h *MessageHandler) handleMessage(from peer.ID, msg *ConsensusMessage) (network.NotificationsMessage, error) {
 	if msg == nil || len(msg.Data) == 0 {
 		logger.Trace("received nil message or message with nil data")
 		return nil, nil
@@ -72,7 +79,7 @@ func (h *MessageHandler) handleMessage(msg *ConsensusMessage) (*ConsensusMessage
 			return nil, nil
 		}
 
-		return nil, h.handleNeighbourMessage(nm)
+		return nil, h.handleNeighbourMessage(from, nm)
 	case catchUpRequestType:
 		if r, ok := m.(*catchUpRequest); ok {
 			return h.handleCatchUpRequest(r)
@@ -88,7 +95,7 @@ func (h *MessageHandler) handleMessage(msg *ConsensusMessage) (*ConsensusMessage
 	return nil, nil
 }
 
-func (h *MessageHandler) handleNeighbourMessage(msg *NeighbourMessage) error {
+func (h *MessageHandler) handleNeighbourMessage(from peer.ID, msg *NeighbourMessage) error {
 	currFinalized, err := h.grandpa.blockState.GetFinalizedHeader(0, 0)
 	if err != nil {
 		return err
@@ -98,6 +105,13 @@ func (h *MessageHandler) handleNeighbourMessage(msg *NeighbourMessage) error {
 		return nil
 	}
 
+	// TODO: make linter british
+	logger.Debug("got neighbor message", "number", msg.Number, "set id", msg.SetID, "round", msg.Round)
+	h.blockNumToSetID.Store(msg.Number, msg.SetID)
+	h.grandpa.network.SendJustificationRequest(from, msg.Number)
+
+	// TODO; determine if there is some reason we don't receive justifications in responses near the head (usually),
+	// and remove the following code if it's fixed.
 	head, err := h.grandpa.blockState.BestBlockNumber()
 	if err != nil {
 		return err
@@ -266,7 +280,7 @@ func decodeMessage(msg *ConsensusMessage) (m GrandpaMessage, err error) {
 			return nil, ErrInvalidMessageType
 		}
 	case finalizationType:
-		mi, err = scale.Decode(msg.Data[1:], &FinalizationMessage{})
+		mi, err = scale.Decode(msg.Data[1:], &FinalizationMessage{Justification: []*SignedPrecommit{}})
 		if m, ok = mi.(*FinalizationMessage); !ok {
 			return nil, ErrInvalidMessageType
 		}
@@ -300,7 +314,7 @@ func (h *MessageHandler) verifyFinalizationMessageJustification(fm *Finalization
 	// verify justifications
 	count := 0
 	for _, just := range fm.Justification {
-		err := h.verifyJustification(just, just.Vote, fm.Round, h.grandpa.state.setID, precommit)
+		err := h.verifyJustification(just, fm.Round, h.grandpa.state.setID, precommit)
 		if err != nil {
 			continue
 		}
@@ -324,7 +338,7 @@ func (h *MessageHandler) verifyPreVoteJustification(msg *catchUpResponse) (commo
 	votes := make(map[common.Hash]uint64)
 
 	for _, just := range msg.PreVoteJustification {
-		err := h.verifyJustification(just, just.Vote, msg.Round, msg.SetID, prevote)
+		err := h.verifyJustification(just, msg.Round, msg.SetID, prevote)
 		if err != nil {
 			continue
 		}
@@ -351,7 +365,7 @@ func (h *MessageHandler) verifyPreCommitJustification(msg *catchUpResponse) erro
 	// verify pre-commit justification
 	count := 0
 	for _, just := range msg.PreCommitJustification {
-		err := h.verifyJustification(just, just.Vote, msg.Round, msg.SetID, precommit)
+		err := h.verifyJustification(just, msg.Round, msg.SetID, precommit)
 		if err != nil {
 			continue
 		}
@@ -368,11 +382,11 @@ func (h *MessageHandler) verifyPreCommitJustification(msg *catchUpResponse) erro
 	return nil
 }
 
-func (h *MessageHandler) verifyJustification(just *Justification, vote *Vote, round, setID uint64, stage subround) error {
+func (h *MessageHandler) verifyJustification(just *SignedPrecommit, round, setID uint64, stage subround) error {
 	// verify signature
 	msg, err := scale.Encode(&FullVote{
 		Stage: stage,
-		Vote:  vote,
+		Vote:  just.Vote,
 		Round: round,
 		SetID: setID,
 	})
@@ -411,3 +425,54 @@ func (h *MessageHandler) verifyJustification(just *Justification, vote *Vote, ro
 	}
 	return nil
 }
+
+// VerifyBlockJustification verifies the finality justification for a block
+func (s *Service) VerifyBlockJustification(justification []byte) error {
+	r := &bytes.Buffer{}
+	_, _ = r.Write(justification)
+	fj := new(Justification)
+	err := fj.Decode(r)
+	if err != nil {
+		return err
+	}
+
+	logger.Debug("verifiying justification", "round", fj.Round, "hash", fj.Commit.Hash, "number", fj.Commit.Number, "sig count", len(fj.Commit.Precommits))
+
+	for _, just := range fj.Commit.Precommits {
+		// TODO: when catch up is done, we should know all the setIDs
+		s, has := s.messageHandler.blockNumToSetID.Load(fj.Commit.Number)
+		if !has {
+			continue
+		}
+
+		setID := s.(uint64)
+
+		// verify signature for each precommit
+		// TODO: verify authority is in set; this requires updating catch-up to get the right set
+		msg, err := scale.Encode(&FullVote{
+			Stage: precommit,
+			Vote:  just.Vote,
+			Round: fj.Round,
+			SetID: setID,
+		})
+		if err != nil {
+			return err
+		}
+
+		pk, err := ed25519.NewPublicKey(just.AuthorityID[:])
+		if err != nil {
+			return err
+		}
+
+		ok, err := pk.Verify(msg, just.Signature[:])
+		if err != nil {
+			return err
+		}
+
+		if !ok {
+			return ErrInvalidSignature
+		}
+	}
+
+	return nil
+}
diff --git a/lib/grandpa/message_handler_test.go b/lib/grandpa/message_handler_test.go
index bc24be8e0e..42271383ec 100644
--- a/lib/grandpa/message_handler_test.go
+++ b/lib/grandpa/message_handler_test.go
@@ -40,12 +40,12 @@ var testHeader = &types.Header{
 
 var testHash = testHeader.Hash()
 
-func buildTestJustifications(t *testing.T, qty int, round, setID uint64, kr *keystore.Ed25519Keyring, subround subround) []*Justification {
-	just := []*Justification{}
+func buildTestJustification(t *testing.T, qty int, round, setID uint64, kr *keystore.Ed25519Keyring, subround subround) []*SignedPrecommit {
+	just := []*SignedPrecommit{}
 	for i := 0; i < qty; i++ {
-		j := &Justification{
-			Vote:        NewVote(testHash, round),
-			Signature:   createSignedVoteMsg(t, round, round, setID, kr.Keys[i%len(kr.Keys)], subround),
+		j := &SignedPrecommit{
+			Vote:        NewVote(testHash, uint32(round)),
+			Signature:   createSignedVoteMsg(t, uint32(round), round, setID, kr.Keys[i%len(kr.Keys)], subround),
 			AuthorityID: kr.Keys[i%len(kr.Keys)].Public().(*ed25519.PublicKey).AsBytes(),
 		}
 		just = append(just, j)
@@ -54,7 +54,7 @@ func buildTestJustifications(t *testing.T, qty int, round, setID uint64, kr *key
 
 }
 
-func createSignedVoteMsg(t *testing.T, number, round, setID uint64, pk *ed25519.Keypair, subround subround) [64]byte {
+func createSignedVoteMsg(t *testing.T, number uint32, round, setID uint64, pk *ed25519.Keypair, subround subround) [64]byte {
 	// create vote message
 	msg, err := scale.Encode(&FullVote{
 		Stage: subround,
@@ -73,7 +73,7 @@ func createSignedVoteMsg(t *testing.T, number, round, setID uint64, pk *ed25519.
 
 func TestDecodeMessage_VoteMessage(t *testing.T) {
 	cm := &ConsensusMessage{
-		Data: common.MustHexToBytes("0x004d000000000000006300000000000000017db9db5ed9967b80143100189ba69d9e4deab85ac3570e5df25686cabe32964a777700000000000036e6eca85489bebbb0f687ca5404748d5aa2ffabee34e3ed272cc7b2f6d0a82c65b99bc7cd90dbc21bb528289ebf96705dbd7d96918d34d815509b4e0e2a030f34602b88f60513f1c805d87ef52896934baf6a662bc37414dbdbf69356b1a691"),
+		Data: common.MustHexToBytes("0x004d000000000000006300000000000000017db9db5ed9967b80143100189ba69d9e4deab85ac3570e5df25686cabe32964a7777000036e6eca85489bebbb0f687ca5404748d5aa2ffabee34e3ed272cc7b2f6d0a82c65b99bc7cd90dbc21bb528289ebf96705dbd7d96918d34d815509b4e0e2a030f34602b88f60513f1c805d87ef52896934baf6a662bc37414dbdbf69356b1a691"),
 	}
 
 	msg, err := decodeMessage(cm)
@@ -100,7 +100,7 @@ func TestDecodeMessage_VoteMessage(t *testing.T) {
 
 func TestDecodeMessage_FinalizationMessage(t *testing.T) {
 	cm := &ConsensusMessage{
-		Data: common.MustHexToBytes("0x054d000000000000007db9db5ed9967b80143100189ba69d9e4deab85ac3570e5df25686cabe32964a0000000000000000040a0b0c0d00000000000000000000000000000000000000000000000000000000e7030000000000000102030400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034602b88f60513f1c805d87ef52896934baf6a662bc37414dbdbf69356b1a691"),
+		Data: common.MustHexToBytes("0x054d000000000000007db9db5ed9967b80143100189ba69d9e4deab85ac3570e5df25686cabe32964a00000000040a0b0c0d00000000000000000000000000000000000000000000000000000000e70300000102030400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034602b88f60513f1c805d87ef52896934baf6a662bc37414dbdbf69356b1a691"),
 	}
 
 	msg, err := decodeMessage(cm)
@@ -112,7 +112,7 @@ func TestDecodeMessage_FinalizationMessage(t *testing.T) {
 			hash:   common.MustHexToHash("0x7db9db5ed9967b80143100189ba69d9e4deab85ac3570e5df25686cabe32964a"),
 			number: 0,
 		},
-		Justification: []*Justification{
+		Justification: []*SignedPrecommit{
 			{
 				Vote:        testVote,
 				Signature:   testSignature,
@@ -173,7 +173,7 @@ func TestMessageHandler_VoteMessage(t *testing.T) {
 	require.NoError(t, err)
 
 	h := NewMessageHandler(gs, st.Block)
-	out, err := h.handleMessage(cm)
+	out, err := h.handleMessage("", cm)
 	require.NoError(t, err)
 	require.Nil(t, out)
 
@@ -199,7 +199,7 @@ func TestMessageHandler_NeighbourMessage(t *testing.T) {
 	cm, err := msg.ToConsensusMessage()
 	require.NoError(t, err)
 
-	_, err = h.handleMessage(cm)
+	_, err = h.handleMessage("", cm)
 	require.True(t, errors.Is(err, chaindb.ErrKeyNotFound))
 
 	block := &types.Block{
@@ -213,7 +213,7 @@ func TestMessageHandler_NeighbourMessage(t *testing.T) {
 	err = st.Block.AddBlock(block)
 	require.NoError(t, err)
 
-	out, err := h.handleMessage(cm)
+	out, err := h.handleMessage("", cm)
 	require.NoError(t, err)
 	require.Nil(t, out)
 
@@ -226,14 +226,14 @@ func TestMessageHandler_VerifyJustification_InvalidSig(t *testing.T) {
 	gs, st := newTestService(t)
 	gs.state.round = 77
 
-	just := &Justification{
+	just := &SignedPrecommit{
 		Vote:        testVote,
 		Signature:   [64]byte{0x1},
 		AuthorityID: gs.publicKeyBytes(),
 	}
 
 	h := NewMessageHandler(gs, st.Block)
-	err := h.verifyJustification(just, just.Vote, gs.state.round, gs.state.setID, precommit)
+	err := h.verifyJustification(just, gs.state.round, gs.state.setID, precommit)
 	require.Equal(t, err, ErrInvalidSignature)
 }
 
@@ -242,15 +242,15 @@ func TestMessageHandler_FinalizationMessage_NoCatchUpRequest_ValidSig(t *testing
 
 	round := uint64(77)
 	gs.state.round = round
-	gs.justification[round] = buildTestJustifications(t, int(gs.state.threshold()), round, gs.state.setID, kr, precommit)
+	gs.justification[round] = buildTestJustification(t, int(gs.state.threshold()), round, gs.state.setID, kr, precommit)
 
 	fm := gs.newFinalizationMessage(gs.head, round)
-	fm.Vote = NewVote(testHash, round)
+	fm.Vote = NewVote(testHash, uint32(round))
 	cm, err := fm.ToConsensusMessage()
 	require.NoError(t, err)
 
 	h := NewMessageHandler(gs, st.Block)
-	out, err := h.handleMessage(cm)
+	out, err := h.handleMessage("", cm)
 	require.NoError(t, err)
 	require.Nil(t, out)
 
@@ -269,14 +269,14 @@ func TestMessageHandler_FinalizationMessage_NoCatchUpRequest_MinVoteError(t *tes
 	round := uint64(77)
 	gs.state.round = round
 
-	gs.justification[round] = buildTestJustifications(t, int(gs.state.threshold()), round, gs.state.setID, kr, precommit)
+	gs.justification[round] = buildTestJustification(t, int(gs.state.threshold()), round, gs.state.setID, kr, precommit)
 
 	fm := gs.newFinalizationMessage(gs.head, round)
 	cm, err := fm.ToConsensusMessage()
 	require.NoError(t, err)
 
 	h := NewMessageHandler(gs, st.Block)
-	out, err := h.handleMessage(cm)
+	out, err := h.handleMessage("", cm)
 	require.EqualError(t, err, ErrMinVotesNotMet.Error())
 	require.Nil(t, out)
 }
@@ -284,7 +284,7 @@ func TestMessageHandler_FinalizationMessage_NoCatchUpRequest_MinVoteError(t *tes
 func TestMessageHandler_FinalizationMessage_WithCatchUpRequest(t *testing.T) {
 	gs, st := newTestService(t)
 
-	gs.justification[77] = []*Justification{
+	gs.justification[77] = []*SignedPrecommit{
 		{
 			Vote:        testVote,
 			Signature:   testSignature,
@@ -298,7 +298,7 @@ func TestMessageHandler_FinalizationMessage_WithCatchUpRequest(t *testing.T) {
 	gs.state.voters = gs.state.voters[:1]
 
 	h := NewMessageHandler(gs, st.Block)
-	out, err := h.handleMessage(cm)
+	out, err := h.handleMessage("", cm)
 	require.NoError(t, err)
 	require.NotNil(t, out)
 
@@ -316,7 +316,7 @@ func TestMessageHandler_CatchUpRequest_InvalidRound(t *testing.T) {
 	require.NoError(t, err)
 
 	h := NewMessageHandler(gs, st.Block)
-	_, err = h.handleMessage(cm)
+	_, err = h.handleMessage("", cm)
 	require.Equal(t, ErrInvalidCatchUpRound, err)
 }
 
@@ -328,7 +328,7 @@ func TestMessageHandler_CatchUpRequest_InvalidSetID(t *testing.T) {
 	require.NoError(t, err)
 
 	h := NewMessageHandler(gs, st.Block)
-	_, err = h.handleMessage(cm)
+	_, err = h.handleMessage("", cm)
 	require.Equal(t, ErrSetIDMismatch, err)
 }
 
@@ -350,7 +350,7 @@ func TestMessageHandler_CatchUpRequest_WithResponse(t *testing.T) {
 	err = gs.blockState.(*state.BlockState).SetHeader(testHeader)
 	require.NoError(t, err)
 
-	pvj := []*Justification{
+	pvj := []*SignedPrecommit{
 		{
 			Vote:        testVote,
 			Signature:   testSignature,
@@ -361,7 +361,7 @@ func TestMessageHandler_CatchUpRequest_WithResponse(t *testing.T) {
 	pvjEnc, err := scale.Encode(pvj)
 	require.NoError(t, err)
 
-	pcj := []*Justification{
+	pcj := []*SignedPrecommit{
 		{
 			Vote:        testVote2,
 			Signature:   testSignature,
@@ -387,7 +387,7 @@ func TestMessageHandler_CatchUpRequest_WithResponse(t *testing.T) {
 	require.NoError(t, err)
 
 	h := NewMessageHandler(gs, st.Block)
-	out, err := h.handleMessage(cm)
+	out, err := h.handleMessage("", cm)
 	require.NoError(t, err)
 	require.Equal(t, expected, out)
 }
@@ -397,13 +397,13 @@ func TestVerifyJustification(t *testing.T) {
 	h := NewMessageHandler(gs, st.Block)
 
 	vote := NewVote(testHash, 123)
-	just := &Justification{
+	just := &SignedPrecommit{
 		Vote:        vote,
 		Signature:   createSignedVoteMsg(t, vote.number, 77, gs.state.setID, kr.Alice().(*ed25519.Keypair), precommit),
 		AuthorityID: kr.Alice().Public().(*ed25519.PublicKey).AsBytes(),
 	}
 
-	err := h.verifyJustification(just, vote, 77, gs.state.setID, precommit)
+	err := h.verifyJustification(just, 77, gs.state.setID, precommit)
 	require.NoError(t, err)
 }
 
@@ -412,14 +412,14 @@ func TestVerifyJustification_InvalidSignature(t *testing.T) {
 	h := NewMessageHandler(gs, st.Block)
 
 	vote := NewVote(testHash, 123)
-	just := &Justification{
+	just := &SignedPrecommit{
 		Vote: vote,
 		// create signed vote with mismatched vote number
 		Signature:   createSignedVoteMsg(t, vote.number+1, 77, gs.state.setID, kr.Alice().(*ed25519.Keypair), precommit),
 		AuthorityID: kr.Alice().Public().(*ed25519.PublicKey).AsBytes(),
 	}
 
-	err := h.verifyJustification(just, vote, 77, gs.state.setID, precommit)
+	err := h.verifyJustification(just, 77, gs.state.setID, precommit)
 	require.EqualError(t, err, ErrInvalidSignature.Error())
 }
 
@@ -431,13 +431,13 @@ func TestVerifyJustification_InvalidAuthority(t *testing.T) {
 	require.NoError(t, err)
 
 	vote := NewVote(testHash, 123)
-	just := &Justification{
+	just := &SignedPrecommit{
 		Vote:        vote,
 		Signature:   createSignedVoteMsg(t, vote.number, 77, gs.state.setID, fakeKey, precommit),
 		AuthorityID: fakeKey.Public().(*ed25519.PublicKey).AsBytes(),
 	}
 
-	err = h.verifyJustification(just, vote, 77, gs.state.setID, precommit)
+	err = h.verifyJustification(just, 77, gs.state.setID, precommit)
 	require.EqualError(t, err, ErrVoterNotFound.Error())
 }
 
@@ -445,7 +445,7 @@ func TestMessageHandler_VerifyPreVoteJustification(t *testing.T) {
 	gs, st := newTestService(t)
 	h := NewMessageHandler(gs, st.Block)
 
-	just := buildTestJustifications(t, int(gs.state.threshold()), 1, gs.state.setID, kr, prevote)
+	just := buildTestJustification(t, int(gs.state.threshold()), 1, gs.state.setID, kr, prevote)
 	msg := &catchUpResponse{
 		Round:                1,
 		SetID:                gs.state.setID,
@@ -462,13 +462,13 @@ func TestMessageHandler_VerifyPreCommitJustification(t *testing.T) {
 	h := NewMessageHandler(gs, st.Block)
 
 	round := uint64(1)
-	just := buildTestJustifications(t, int(gs.state.threshold()), round, gs.state.setID, kr, precommit)
+	just := buildTestJustification(t, int(gs.state.threshold()), round, gs.state.setID, kr, precommit)
 	msg := &catchUpResponse{
 		Round:                  round,
 		SetID:                  gs.state.setID,
 		PreCommitJustification: just,
 		Hash:                   testHash,
-		Number:                 round,
+		Number:                 uint32(round),
 	}
 
 	err := h.verifyPreCommitJustification(msg)
@@ -486,22 +486,33 @@ func TestMessageHandler_HandleCatchUpResponse(t *testing.T) {
 	round := uint64(77)
 	gs.state.round = round + 1
 
-	pvJust := buildTestJustifications(t, int(gs.state.threshold()), round, gs.state.setID, kr, prevote)
-	pcJust := buildTestJustifications(t, int(gs.state.threshold()), round, gs.state.setID, kr, precommit)
+	pvJust := buildTestJustification(t, int(gs.state.threshold()), round, gs.state.setID, kr, prevote)
+	pcJust := buildTestJustification(t, int(gs.state.threshold()), round, gs.state.setID, kr, precommit)
 	msg := &catchUpResponse{
 		Round:                  round,
 		SetID:                  gs.state.setID,
 		PreVoteJustification:   pvJust,
 		PreCommitJustification: pcJust,
 		Hash:                   testHash,
-		Number:                 round,
+		Number:                 uint32(round),
 	}
 
 	cm, err := msg.ToConsensusMessage()
 	require.NoError(t, err)
 
-	out, err := h.handleMessage(cm)
+	out, err := h.handleMessage("", cm)
 	require.NoError(t, err)
 	require.Nil(t, out)
 	require.Equal(t, round+1, gs.state.round)
 }
+
+func TestMessageHandler_VerifyBlockJustification(t *testing.T) {
+	setID := uint64(450)
+	// data received from network
+	data := common.MustHexToBytes("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+
+	gs, _ := newTestService(t)
+	gs.messageHandler.blockNumToSetID.Store(uint32(4635975), setID)
+	err := gs.VerifyBlockJustification(data)
+	require.NoError(t, err)
+}
diff --git a/lib/grandpa/message_test.go b/lib/grandpa/message_test.go
index 514c0db3be..0b39ad9ce1 100644
--- a/lib/grandpa/message_test.go
+++ b/lib/grandpa/message_test.go
@@ -7,6 +7,7 @@ import (
 	"github.com/ChainSafe/gossamer/dot/state"
 	"github.com/ChainSafe/gossamer/dot/types"
 	"github.com/ChainSafe/gossamer/lib/common"
+	"github.com/ChainSafe/gossamer/lib/crypto/ed25519"
 	"github.com/ChainSafe/gossamer/lib/scale"
 
 	"github.com/stretchr/testify/require"
@@ -38,33 +39,43 @@ func TestVoteMessageToConsensusMessage(t *testing.T) {
 	// test precommit
 	vm, err := gs.createVoteMessage(v, precommit, gs.keypair)
 	require.NoError(t, err)
-
-	cm, err := vm.ToConsensusMessage()
-	require.NoError(t, err)
-
-	expected := &ConsensusMessage{
-		Data: common.MustHexToBytes("0x014d000000000000006300000000000000017db9db5ed9967b80143100189ba69d9e4deab85ac3570e5df25686cabe32964a7777000000000000a28633c3a1046351931209fe9182fd530dc659d54ece48e9f88f4277e47f39eb78a84d50e3d37e1b50786d88abafceb5137044b6122fb6b7b5ae8ff62787cc0e34602b88f60513f1c805d87ef52896934baf6a662bc37414dbdbf69356b1a691"),
+	vm.Message.Signature = [64]byte{}
+
+	expected := &VoteMessage{
+		Round: gs.state.round,
+		SetID: gs.state.setID,
+		Stage: precommit,
+		Message: &SignedMessage{
+			Hash:        v.hash,
+			Number:      v.number,
+			AuthorityID: gs.keypair.Public().(*ed25519.PublicKey).AsBytes(),
+		},
 	}
 
-	require.Equal(t, expected, cm)
+	require.Equal(t, expected, vm)
 
 	// test prevote
 	vm, err = gs.createVoteMessage(v, prevote, gs.keypair)
 	require.NoError(t, err)
-
-	cm, err = vm.ToConsensusMessage()
-	require.NoError(t, err)
-
-	expected = &ConsensusMessage{
-		Data: common.MustHexToBytes("0x004d000000000000006300000000000000007db9db5ed9967b80143100189ba69d9e4deab85ac3570e5df25686cabe32964a7777000000000000215cea37b45853e63d4cc2f0a04c7a33aec9fc5683ac46b03a01e6c41ce46e4339bb7456667f14d109b49e8af26090f7087991f3b22494df997551ae44a0ef0034602b88f60513f1c805d87ef52896934baf6a662bc37414dbdbf69356b1a691"),
+	vm.Message.Signature = [64]byte{}
+
+	expected = &VoteMessage{
+		Round: gs.state.round,
+		SetID: gs.state.setID,
+		Stage: prevote,
+		Message: &SignedMessage{
+			Hash:        v.hash,
+			Number:      v.number,
+			AuthorityID: gs.keypair.Public().(*ed25519.PublicKey).AsBytes(),
+		},
 	}
 
-	require.Equal(t, expected, cm)
+	require.Equal(t, expected, vm)
 }
 
 func TestFinalizationMessageToConsensusMessage(t *testing.T) {
 	gs, _ := newTestService(t)
-	gs.justification[77] = []*Justification{
+	gs.justification[77] = []*SignedPrecommit{
 		{
 			Vote:        testVote,
 			Signature:   testSignature,
@@ -73,14 +84,14 @@ func TestFinalizationMessageToConsensusMessage(t *testing.T) {
 	}
 
 	fm := gs.newFinalizationMessage(gs.head, 77)
-	cm, err := fm.ToConsensusMessage()
-	require.NoError(t, err)
 
-	expected := &ConsensusMessage{
-		Data: common.MustHexToBytes("0x054d000000000000007db9db5ed9967b80143100189ba69d9e4deab85ac3570e5df25686cabe32964a0000000000000000040a0b0c0d00000000000000000000000000000000000000000000000000000000e7030000000000000102030400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034602b88f60513f1c805d87ef52896934baf6a662bc37414dbdbf69356b1a691"),
+	expected := &FinalizationMessage{
+		Round:         77,
+		Vote:          NewVoteFromHeader(gs.head),
+		Justification: gs.justification[77],
 	}
 
-	require.Equal(t, expected, cm)
+	require.Equal(t, expected, fm)
 }
 
 func TestNewCatchUpResponse(t *testing.T) {
@@ -103,7 +114,7 @@ func TestNewCatchUpResponse(t *testing.T) {
 	err = gs.blockState.(*state.BlockState).SetHeader(testHeader)
 	require.NoError(t, err)
 
-	pvj := []*Justification{
+	pvj := []*SignedPrecommit{
 		{
 			Vote:        testVote,
 			Signature:   testSignature,
@@ -114,7 +125,7 @@ func TestNewCatchUpResponse(t *testing.T) {
 	pvjEnc, err := scale.Encode(pvj)
 	require.NoError(t, err)
 
-	pcj := []*Justification{
+	pcj := []*SignedPrecommit{
 		{
 			Vote:        testVote2,
 			Signature:   testSignature,
@@ -134,8 +145,8 @@ func TestNewCatchUpResponse(t *testing.T) {
 	expected := &catchUpResponse{
 		Round:                  round,
 		SetID:                  setID,
-		PreVoteJustification:   FullJustification(pvj),
-		PreCommitJustification: FullJustification(pcj),
+		PreVoteJustification:   pvj,
+		PreCommitJustification: pcj,
 		Hash:                   v.hash,
 		Number:                 v.number,
 	}
diff --git a/lib/grandpa/network.go b/lib/grandpa/network.go
index f596282b5f..5fd7e31b1c 100644
--- a/lib/grandpa/network.go
+++ b/lib/grandpa/network.go
@@ -124,13 +124,13 @@ func (s *Service) decodeMessage(in []byte) (NotificationsMessage, error) {
 	return msg, err
 }
 
-func (s *Service) handleNetworkMessage(_ peer.ID, msg NotificationsMessage) error {
+func (s *Service) handleNetworkMessage(from peer.ID, msg NotificationsMessage) error {
 	cm, ok := msg.(*network.ConsensusMessage)
 	if !ok {
 		return ErrInvalidMessageType
 	}
 
-	resp, err := s.messageHandler.handleMessage(cm)
+	resp, err := s.messageHandler.handleMessage(from, cm)
 	if err != nil {
 		return err
 	}
diff --git a/lib/grandpa/network_test.go b/lib/grandpa/network_test.go
index d8f2fc8ba2..58c9352506 100644
--- a/lib/grandpa/network_test.go
+++ b/lib/grandpa/network_test.go
@@ -46,7 +46,7 @@ func TestGrandpaHandshake_Encode(t *testing.T) {
 func TestHandleNetworkMessage(t *testing.T) {
 	gs, st := newTestService(t)
 
-	gs.justification[77] = []*Justification{
+	gs.justification[77] = []*SignedPrecommit{
 		{
 			Vote:        testVote,
 			Signature:   testSignature,
diff --git a/lib/grandpa/round_test.go b/lib/grandpa/round_test.go
index 51c34e814f..815da4473e 100644
--- a/lib/grandpa/round_test.go
+++ b/lib/grandpa/round_test.go
@@ -30,6 +30,7 @@ import (
 	"github.com/ChainSafe/gossamer/lib/keystore"
 
 	log "github.com/ChainSafe/log15"
+	"github.com/libp2p/go-libp2p-core/peer"
 	"github.com/libp2p/go-libp2p-core/protocol"
 	"github.com/stretchr/testify/require"
 )
@@ -64,6 +65,8 @@ func (n *testNetwork) SendMessage(msg NotificationsMessage) {
 	}
 }
 
+func (n *testNetwork) SendJustificationRequest(_ peer.ID, _ uint32) {}
+
 func (n *testNetwork) RegisterNotificationsProtocol(sub protocol.ID,
 	messageID byte,
 	handshakeGetter network.HandshakeGetter,
@@ -287,8 +290,8 @@ func TestPlayGrandpaRound_BaseCase(t *testing.T) {
 	for _, fb := range finalized {
 		require.NotNil(t, fb)
 		require.GreaterOrEqual(t, len(fb.Justification), len(kr.Keys)/2)
-		finalized[0].Justification = []*Justification{}
-		fb.Justification = []*Justification{}
+		finalized[0].Justification = []*SignedPrecommit{}
+		fb.Justification = []*SignedPrecommit{}
 		require.Equal(t, finalized[0], fb)
 	}
 }
@@ -385,8 +388,8 @@ func TestPlayGrandpaRound_VaryingChain(t *testing.T) {
 	for _, fb := range finalized {
 		require.NotNil(t, fb)
 		require.GreaterOrEqual(t, len(fb.Justification), len(kr.Keys)/2)
-		finalized[0].Justification = []*Justification{}
-		fb.Justification = []*Justification{}
+		finalized[0].Justification = []*SignedPrecommit{}
+		fb.Justification = []*SignedPrecommit{}
 		require.Equal(t, finalized[0], fb)
 	}
 }
@@ -482,8 +485,8 @@ func TestPlayGrandpaRound_OneThirdEquivocating(t *testing.T) {
 	for _, fb := range finalized {
 		require.NotNil(t, fb)
 		require.GreaterOrEqual(t, len(fb.Justification), len(kr.Keys)/2)
-		finalized[0].Justification = []*Justification{}
-		fb.Justification = []*Justification{}
+		finalized[0].Justification = []*SignedPrecommit{}
+		fb.Justification = []*SignedPrecommit{}
 		require.Equal(t, finalized[0], fb)
 	}
 }
@@ -565,8 +568,8 @@ func TestPlayGrandpaRound_MultipleRounds(t *testing.T) {
 			require.NotNil(t, fb)
 			require.Equal(t, head, fb.Vote.hash)
 			require.GreaterOrEqual(t, len(fb.Justification), len(kr.Keys)/2)
-			finalized[0].Justification = []*Justification{}
-			fb.Justification = []*Justification{}
+			finalized[0].Justification = []*SignedPrecommit{}
+			fb.Justification = []*SignedPrecommit{}
 			require.Equal(t, finalized[0], fb)
 		}
 
diff --git a/lib/grandpa/state.go b/lib/grandpa/state.go
index e4d830d5a6..32e8745dca 100644
--- a/lib/grandpa/state.go
+++ b/lib/grandpa/state.go
@@ -23,6 +23,7 @@ import (
 	"github.com/ChainSafe/gossamer/dot/types"
 	"github.com/ChainSafe/gossamer/lib/common"
 
+	"github.com/libp2p/go-libp2p-core/peer"
 	"github.com/libp2p/go-libp2p-core/protocol"
 )
 
@@ -60,6 +61,7 @@ type DigestHandler interface {
 // Network is the interface required by GRANDPA for the network
 type Network interface {
 	SendMessage(msg network.NotificationsMessage)
+	SendJustificationRequest(to peer.ID, num uint32)
 	RegisterNotificationsProtocol(sub protocol.ID,
 		messageID byte,
 		handshakeGetter network.HandshakeGetter,
diff --git a/lib/grandpa/types.go b/lib/grandpa/types.go
index 7466a82885..45484818b3 100644
--- a/lib/grandpa/types.go
+++ b/lib/grandpa/types.go
@@ -153,11 +153,11 @@ func (s *State) threshold() uint64 {
 // Vote represents a vote for a block with the given hash and number
 type Vote struct {
 	hash   common.Hash
-	number uint64
+	number uint32
 }
 
 // NewVote returns a new Vote given a block hash and number
-func NewVote(hash common.Hash, number uint64) *Vote {
+func NewVote(hash common.Hash, number uint32) *Vote {
 	return &Vote{
 		hash:   hash,
 		number: number,
@@ -168,7 +168,7 @@ func NewVote(hash common.Hash, number uint64) *Vote {
 func NewVoteFromHeader(h *types.Header) *Vote {
 	return &Vote{
 		hash:   h.Hash(),
-		number: uint64(h.Number.Int64()),
+		number: uint32(h.Number.Int64()),
 	}
 }
 
@@ -193,8 +193,8 @@ func NewVoteFromHash(hash common.Hash, blockState BlockState) (*Vote, error) {
 
 // Encode returns the SCALE encoding of a Vote
 func (v *Vote) Encode() ([]byte, error) {
-	buf := make([]byte, 8)
-	binary.LittleEndian.PutUint64(buf, v.number)
+	buf := make([]byte, 4)
+	binary.LittleEndian.PutUint32(buf, v.number)
 	return append(v.hash[:], buf...), nil
 }
 
@@ -210,7 +210,7 @@ func (v *Vote) Decode(r io.Reader) (*Vote, error) {
 		return nil, err
 	}
 
-	v.number, err = common.ReadUint64(r)
+	v.number, err = common.ReadUint32(r)
 	if err != nil {
 		return nil, err
 	}
@@ -223,15 +223,15 @@ func (v *Vote) String() string {
 	return fmt.Sprintf("hash=%s number=%d", v.hash, v.number)
 }
 
-// Justification represents a justification for a finalized block
-type Justification struct {
+// SignedPrecommit represents a signed precommit message for a finalized block
+type SignedPrecommit struct {
 	Vote        *Vote
 	Signature   [64]byte
 	AuthorityID ed25519.PublicKeyBytes
 }
 
 // Encode returns the SCALE encoded Justification
-func (j *Justification) Encode() ([]byte, error) {
+func (j *SignedPrecommit) Encode() ([]byte, error) {
 	enc, err := j.Vote.Encode()
 	if err != nil {
 		return nil, err
@@ -243,32 +243,59 @@ func (j *Justification) Encode() ([]byte, error) {
 }
 
 // Decode returns the SCALE decoded Justification
-func (j *Justification) Decode(r io.Reader) (*Justification, error) {
+func (j *SignedPrecommit) Decode(r io.Reader) (*SignedPrecommit, error) {
 	sd := &scale.Decoder{Reader: r}
 	i, err := sd.Decode(j)
-	return i.(*Justification), err
+	if err != nil {
+		return nil, err
+	}
+
+	d := i.(*SignedPrecommit)
+	j.Vote = d.Vote
+	j.Signature = d.Signature
+	j.AuthorityID = d.AuthorityID
+	return j, nil
 }
 
-// FullJustification represents an array of Justifications, used to respond to catch up requests
-type FullJustification []*Justification
+// Commit contains all the signed precommits for a given block
+type Commit struct {
+	Hash       common.Hash
+	Number     uint32
+	Precommits []*SignedPrecommit
+}
 
-func newFullJustification(j []*Justification) FullJustification {
-	return FullJustification(j)
+// Justification represents a finality justification for a block
+type Justification struct {
+	Round  uint64
+	Commit *Commit
+}
+
+func newJustification(round uint64, hash common.Hash, number uint32, j []*SignedPrecommit) *Justification {
+	return &Justification{
+		Round: round,
+		Commit: &Commit{
+			Hash:       hash,
+			Number:     number,
+			Precommits: j,
+		},
+	}
 }
 
 // Encode returns the SCALE encoding of a FullJustification
-func (j FullJustification) Encode() ([]byte, error) {
+func (j *Justification) Encode() ([]byte, error) {
 	return scale.Encode(j)
 }
 
 // Decode returns a SCALE decoded FullJustification
-func (j FullJustification) Decode(r io.Reader) (FullJustification, error) {
+func (j *Justification) Decode(r io.Reader) error {
 	sd := &scale.Decoder{Reader: r}
-	i, err := sd.Decode([]*Justification{})
+	i, err := sd.Decode(&Justification{Commit: &Commit{}})
 	if err != nil {
-		return FullJustification{}, err
+		return err
 	}
 
-	j = FullJustification(i.([]*Justification))
-	return j, nil
+	dec := i.(*Justification)
+	j.Round = dec.Round
+	j.Commit = dec.Commit
+	return nil
 }
diff --git a/lib/grandpa/types_test.go b/lib/grandpa/types_test.go
index 6ec49d61e7..7ee29885ec 100644
--- a/lib/grandpa/types_test.go
+++ b/lib/grandpa/types_test.go
@@ -20,6 +20,7 @@ import (
 	"bytes"
 	"testing"
 
+	"github.com/ChainSafe/gossamer/lib/common"
 	"github.com/ChainSafe/gossamer/lib/crypto/ed25519"
 	"github.com/ChainSafe/gossamer/lib/keystore"
 	"github.com/ChainSafe/gossamer/lib/scale"
@@ -38,8 +39,8 @@ func TestPubkeyToVoter(t *testing.T) {
 	require.Equal(t, voters[0], voter)
 }
 
-func TestJustificationEncoding(t *testing.T) {
-	just := &Justification{
+func TestSignedPrecommitEncoding(t *testing.T) {
+	just := &SignedPrecommit{
 		Vote:        testVote,
 		Signature:   testSignature,
 		AuthorityID: testAuthorityID,
@@ -50,13 +51,14 @@ func TestJustificationEncoding(t *testing.T) {
 
 	rw := &bytes.Buffer{}
 	rw.Write(enc)
-	dec, err := new(Justification).Decode(rw)
+	dec := new(SignedPrecommit)
+	_, err = dec.Decode(rw)
 	require.NoError(t, err)
 	require.Equal(t, just, dec)
 }
 
-func TestJustificationArrayEncoding(t *testing.T) {
-	just := []*Justification{
+func TestSignedPrecommitArrayEncoding(t *testing.T) {
+	just := []*SignedPrecommit{
 		{
 			Vote:        testVote,
 			Signature:   testSignature,
@@ -67,25 +69,46 @@ func TestJustificationArrayEncoding(t *testing.T) {
 	enc, err := scale.Encode(just)
 	require.NoError(t, err)
 
-	dec, err := scale.Decode(enc, make([]*Justification, 1))
+	dec, err := scale.Decode(enc, make([]*SignedPrecommit, 1))
 	require.NoError(t, err)
-	require.Equal(t, just, dec.([]*Justification))
+	require.Equal(t, just, dec.([]*SignedPrecommit))
 }
 
-func TestFullJustification(t *testing.T) {
-	just := &Justification{
+func TestJustification(t *testing.T) {
+	just := &SignedPrecommit{
 		Vote:        testVote,
 		Signature:   testSignature,
 		AuthorityID: testAuthorityID,
 	}
 
-	fj := FullJustification([]*Justification{just})
+	fj := &Justification{
+		Round: 99,
+		Commit: &Commit{
+			Precommits: []*SignedPrecommit{just},
+		},
+	}
 	enc, err := fj.Encode()
 	require.NoError(t, err)
 
 	rw := &bytes.Buffer{}
 	rw.Write(enc)
-	dec, err := FullJustification{}.Decode(rw)
+	dec := &Justification{}
+	err = dec.Decode(rw)
 	require.NoError(t, err)
 	require.Equal(t, fj, dec)
 }
+
+func TestJustification_Decode(t *testing.T) {
+	// data received from network
+	data := common.MustHexToBytes("0x3b1b0000000000002a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd46001d032a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd4600d5be226e7e7b6b54eb6c830ab47d4fa29bc228f46f176be79bd9b687d01ad7c4441f0c5b7f489462f29ba1641672519a2bbfd9162fb11d646bf1990b0c858e0e026905dab6c71c2a664e9ca8e4f066bdee9265ec45b7885ab14a797ffe1bee362a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd4600c393865ec446b236036e3c846577c930568ea67f1cfe34048cb360d3892d9da61c4b1bd7ee31df96907662e10dae18646ceec91181c5e3dd97605b15f0bfc20d02aabb29f640813f718f1e7495f42415f742457517d536ba5de50990d182df252a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd46000d68aa7ce3c3902cca498cf6c0051d5b0f901f22092a427faa23227a19bc55eda954191acba6b5c82ec03543633facf3f84176ba3b860428d0e160b5a3a2db0802c70dcaf367b35740713c0e6761d88a2e26f9762e9715fac8bbeabedd8c5eca2a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd4600756e9f4187f078001a7368eedc194df7ac7b1cae92827dae36d345061afa3d49df2041a41387501c5fd1b282707303aa3a7c820cce1b44c081c0051e7fc229070339088379600f5bd507277eb894aba34d2a8f27ce1964f41e60ef2a4142dc6e2a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd4600ea73d78ec38c271aebb2c9f7ebebb5d3a99edf327bbf4d03b5c245c08d0c2cceaf0030ecb5e04152255f32e4edfbee970f3ab05607f6d8b718826e559bc18b0e03d105a30087d96b5f0684f6ded76f826b01dab61e4136e1d851a24f0088b5ed2a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd4600681cd145a0375e5f72a737bbf92bc57c1e2b9429cf8b66bda13d0096e1898385ada09ccad93971530349592a430aa61331efb46c04a1bd9af7c34d5be9f2d30b044a5968644cf9f9b5d1c7f657a65343af076730a89b07b4995a494aaa0c967a2a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd4600620c51368e57db2cbf7e1edee0a746dc950c6da129ae5dbf81f3171fbba241f564b847fe376bf7a6f62d9bcefeba69d7d8b23000c40b7c9ec4f2868e6d748408049603b355867a2d3a1978a771b71b2bee4e8ae1f344d9ee034f47b01a48f89b2a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd46000dec8ecfc90b708446f112ad2730149b124d1d4b891edcc7f192ad4f6634fb1529471e902b590049ee6049361537752f8b4780e1900f5134f101039d617a710e069a481209b07b48c1d548d4af68b7584f95b32eb374be0682b342cd64d3406c2a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd46008f6792c7ae77c3dbde17b000c86743bccd9f2247fb323044b12378a0b060f122674fc796d910fb2eaaf7512a5858ce467da7409a2e5fb14edc077c939efcc802088f8736e1cf2ea3d102f0a96ccf51222b8aa1f93d8e42947892f4395cb5477c2a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd460043286aff05190884dc7be3f5b4e42728a1eb766c73cc9745f08322ed672ad944503ec837a379efef89b4c78a5aac7ffe8bd26e649eac482f5324280e259bcc030a790c3ba374fdcf1a1d457adcaa8fc01bb46eba8cae4e1940825364fe2d7ce02a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd460025437e042850b2648ecd98937694a76d041c65b471a81344c55d9aae0650459daaa5f5e734ddf02ae030178ee8714c5f6cc241f8148eafeff450424fe62548040cd72d0e6daf0275f2eec96f6129243e01e255ad6b104ed500e614077d0710982a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd4600fecfa0a948e6cdb687849ea41dc46083ed8562ca4657d751f6c303ae0e35dba38e5c1550cfdd71011239872139770b8151eb4a04df948f666d43811009f12f0b0d49982b323ded139008e150fe97b0e85213a92b411c68f993aaa43ea62a7b282a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd460063dc716d5616a3125fabc437ccc98b3e38bb2730a2564a11edf528552245f20657199cbc982288e2ff3127497a8a725852c35352ee3c0a2109d2e603c33c37000e1b3f7368c230b609c745aa7c2119b60218da3ade7e6a0dace3e337703c51992a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd4600a07873b9fc9d6b71bba7749a8886a13c8d5f4c2b66907bcdf5fddbd88df3c6ece1d601799af6ffb7fb53cece0278df81bd34676ecd20a7494515eea9bb61af020ef0093d298f1adee0947ea81400adf0c27bd2e5c10b760d2c8be3b784e1fa002a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd46006bc6c891010819529a51deedc4a7033de5e85aede0eb4103118110239cbfdad07327aeafc68acfa3b11872770653290f50c09658d416cb2534f0794ddc4b1f0c10d20c8996f5448cff82ded879bacf7534e4d499ec65f040024bd7c2402eba942a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd460090c37f3814f7b66ad1008f43715aa91e3f7713285d44c9b82b88d7125a5a5be38f9c38675891de2455b276ea008321b742f420baa7b2ed8519918edbb8b9b90311addb386a5088eaafbe4c93e265b8c1459a8504f0d31a3799836224c6077d532a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd460085114883f06b533bc6494706326c7191f224f0c086d0a21c8534269c3dd2d7a10c1beaffac80e05250d0c230aa3da0ebfbbd4fe47a8323766b09a8e3ba797b04124cb8ef23a2aa6f5d748070a84465b1cf4df73db94257d96c63df4b5ea8b80c2a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd460037c148f4242ac604913f055679371442e9fdfd7f989ae9d73dbd5cd439a31f941e5c4a63f315a3b4c8faefe537dd51fed26ed948d5cc0110c8c89775e5a2a70914b432d81cead21854d70b19f9691b3d2a8ca7862b64a71f4f3172387078c4642a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f702247bd4600d3acc5151d7a54944aa00350c835fed6f9dfb4f12b8124903d301a959bd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+	fj := new(Justification)
+	rw := &bytes.Buffer{}
+	rw.Write(data)
+
+	err := fj.Decode(rw)
+	require.NoError(t, err)
+	require.Equal(t, uint64(6971), fj.Round)
+	require.Equal(t, uint32(4635975), fj.Commit.Number)
+	require.Equal(t, common.MustHexToHash("0x2a82146e771968df054c8036040dea584339df52d8cbac6970d4c22ed59f7022"), fj.Commit.Hash)
+	require.Equal(t, 199, len(fj.Commit.Precommits))
+}
diff --git a/lib/grandpa/vote_message.go b/lib/grandpa/vote_message.go
index 5767426289..2dbc085026 100644
--- a/lib/grandpa/vote_message.go
+++ b/lib/grandpa/vote_message.go
@@ -184,7 +184,7 @@ func (s *Service) validateMessage(m *VoteMessage) (*Vote, error) {
 	s.mapLock.Lock()
 	defer s.mapLock.Unlock()
 
-	just := &Justification{
+	just := &SignedPrecommit{
 		Vote:        vote,
 		Signature:   m.Message.Signature,
 		AuthorityID: pk.AsBytes(),