Implement beacon committee selections (#13503)

* implement beacon committee selections

* fix build

* fix lint

* fix lint

* Update beacon-chain/rpc/eth/shared/structs.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/client/beacon-api/beacon_committee_selections.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/client/beacon-api/beacon_committee_selections.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/client/beacon-api/beacon_committee_selections.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* move beacon committee selection structs to validator module

* fix bazel build files

* add support for POST and GET endpoints for get state validators query

* add a handler to return error from beacon node

* move beacon committee selection to validator top-level module

* fix bazel

* re-arrange fields to fix lint

* fix TestServer_InitializeRoutes

* fix build and lint

* fix build and lint

* fix TestSubmitAggregateAndProof_Distributed

---------

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

beacon-chain/rpc/eth/validator/handlers.go

@@ -1086,6 +1086,12 @@ func (s *Server) GetLiveness(w http.ResponseWriter, r *http.Request) {
 	httputil.WriteJson(w, resp)
 }
 
+// BeaconCommitteeSelections responds with appropriate message and status code according the spec:
+// https://ethereum.github.io/beacon-APIs/#/Validator/submitBeaconCommitteeSelections.
+func (s *Server) BeaconCommitteeSelections(w http.ResponseWriter, _ *http.Request) {
+	httputil.HandleError(w, "Endpoint not implemented", 501)
+}
+
 // attestationDependentRoot is get_block_root_at_slot(state, compute_start_slot_at_epoch(epoch - 1) - 1)
 // or the genesis block root in the case of underflow.
 func attestationDependentRoot(s state.BeaconState, epoch primitives.Epoch) ([]byte, error) {

beacon-chain/rpc/service.go

@@ -228,6 +228,7 @@ func (s *Service) initializeValidatorServerRoutes(validatorServer *validator.Ser
 	s.cfg.Router.HandleFunc("/eth/v2/validator/blocks/{slot}", validatorServer.ProduceBlockV2).Methods(http.MethodGet)
 	s.cfg.Router.HandleFunc("/eth/v1/validator/blinded_blocks/{slot}", validatorServer.ProduceBlindedBlock).Methods(http.MethodGet)
 	s.cfg.Router.HandleFunc("/eth/v3/validator/blocks/{slot}", validatorServer.ProduceBlockV3).Methods(http.MethodGet)
+	s.cfg.Router.HandleFunc("/eth/v1/validator/beacon_committee_selections", validatorServer.BeaconCommitteeSelections).Methods(http.MethodPost)
 }
 
 func (s *Service) initializeNodeServerRoutes(nodeServer *node.Server) {

beacon-chain/rpc/service_test.go

@@ -152,8 +152,8 @@ func TestServer_InitializeRoutes(t *testing.T) {
 		"/eth/v1/validator/aggregate_and_proofs":           {http.MethodPost},
 		"/eth/v1/validator/beacon_committee_subscriptions": {http.MethodPost},
 		"/eth/v1/validator/sync_committee_subscriptions":   {http.MethodPost},
-		//"/eth/v1/validator/beacon_committee_selections":   {http.MethodPost}, // not implemented
+		"/eth/v1/validator/beacon_committee_selections":    {http.MethodPost},
-		"/eth/v1/validator/sync_committee_contribution": {http.MethodGet},
+		"/eth/v1/validator/sync_committee_contribution":    {http.MethodGet},
 		//"/eth/v1/validator/sync_committee_selections":  {http.MethodPost}, // not implemented
 		"/eth/v1/validator/contribution_and_proofs": {http.MethodPost},
 		"/eth/v1/validator/prepare_beacon_proposer": {http.MethodPost},

cmd/validator/flags/flags.go

@@ -377,6 +377,13 @@ var (
 		Usage: "Sets the maximum size for one batch of validator registrations. Use a non-positive value to disable batching.",
 		Value: 0,
 	}
+
+	// EnableDistributed enables the usage of prysm validator client in a Distributed Validator Cluster.
+	EnableDistributed = &cli.BoolFlag{
+		Name:  "distributed",
+		Usage: "To enable the use of prysm validator client in Distributed Validator Cluster",
+		Value: false,
+	}
 )
 
 // DefaultValidatorDir returns OS-specific default validator directory.

cmd/validator/main.go

@@ -74,6 +74,7 @@ var appFlags = []cli.Flag{
 	flags.WalletDirFlag,
 	flags.EnableWebFlag,
 	flags.GraffitiFileFlag,
+	flags.EnableDistributed,
 	// Consensys' Web3Signer flags
 	flags.Web3SignerURLFlag,
 	flags.Web3SignerPublicValidatorKeysFlag,

cmd/validator/usage.go

@@ -122,6 +122,7 @@ var appHelpFlagGroups = []flagGroup{
 			flags.EnableBuilderFlag,
 			flags.BuilderGasLimitFlag,
 			flags.ValidatorsRegistrationBatchSizeFlag,
+			flags.EnableDistributed,
 		},
 	},
 	{

crypto/bls/common/mock/interface_mock.go

@@ -12,30 +12,30 @@ import (
 )
 
 // MockSecretKey is a mock of SecretKey interface.
-type SecretKey struct {
+type MockSecretKey struct {
 	ctrl     *gomock.Controller
-	recorder *SecretKeyMockRecorder
+	recorder *MockSecretKeyMockRecorder
 }
 
 // MockSecretKeyMockRecorder is the mock recorder for MockSecretKey.
-type SecretKeyMockRecorder struct {
+type MockSecretKeyMockRecorder struct {
-	mock *SecretKey
+	mock *MockSecretKey
 }
 
-// NewSecretKey creates a new mock instance.
+// NewMockSecretKey creates a new mock instance.
-func NewSecretKey(ctrl *gomock.Controller) *SecretKey {
+func NewMockSecretKey(ctrl *gomock.Controller) *MockSecretKey {
-	mock := &SecretKey{ctrl: ctrl}
+	mock := &MockSecretKey{ctrl: ctrl}
-	mock.recorder = &SecretKeyMockRecorder{mock}
+	mock.recorder = &MockSecretKeyMockRecorder{mock}
 	return mock
 }
 
 // EXPECT returns an object that allows the caller to indicate expected use.
-func (m *SecretKey) EXPECT() *SecretKeyMockRecorder {
+func (m *MockSecretKey) EXPECT() *MockSecretKeyMockRecorder {
 	return m.recorder
 }
 
 // Marshal mocks base method.
-func (m *SecretKey) Marshal() []byte {
+func (m *MockSecretKey) Marshal() []byte {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Marshal")
 	ret0, _ := ret[0].([]byte)
@@ -43,13 +43,13 @@ func (m *SecretKey) Marshal() []byte {
 }
 
 // Marshal indicates an expected call of Marshal.
-func (mr *SecretKeyMockRecorder) Marshal() *gomock.Call {
+func (mr *MockSecretKeyMockRecorder) Marshal() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Marshal", reflect.TypeOf((*SecretKey)(nil).Marshal))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Marshal", reflect.TypeOf((*MockSecretKey)(nil).Marshal))
 }
 
 // PublicKey mocks base method.
-func (m *SecretKey) PublicKey() common.PublicKey {
+func (m *MockSecretKey) PublicKey() common.PublicKey {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "PublicKey")
 	ret0, _ := ret[0].(common.PublicKey)
@@ -57,13 +57,13 @@ func (m *SecretKey) PublicKey() common.PublicKey {
 }
 
 // PublicKey indicates an expected call of PublicKey.
-func (mr *SecretKeyMockRecorder) PublicKey() *gomock.Call {
+func (mr *MockSecretKeyMockRecorder) PublicKey() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "PublicKey", reflect.TypeOf((*SecretKey)(nil).PublicKey))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "PublicKey", reflect.TypeOf((*MockSecretKey)(nil).PublicKey))
 }
 
 // Sign mocks base method.
-func (m *SecretKey) Sign(msg []byte) common.Signature {
+func (m *MockSecretKey) Sign(msg []byte) common.Signature {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Sign", msg)
 	ret0, _ := ret[0].(common.Signature)
@@ -71,36 +71,36 @@ func (m *SecretKey) Sign(msg []byte) common.Signature {
 }
 
 // Sign indicates an expected call of Sign.
-func (mr *SecretKeyMockRecorder) Sign(msg interface{}) *gomock.Call {
+func (mr *MockSecretKeyMockRecorder) Sign(msg interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Sign", reflect.TypeOf((*SecretKey)(nil).Sign), msg)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Sign", reflect.TypeOf((*MockSecretKey)(nil).Sign), msg)
 }
 
 // MockPublicKey is a mock of PublicKey interface.
-type PublicKey struct {
+type MockPublicKey struct {
 	ctrl     *gomock.Controller
-	recorder *PublicKeyMockRecorder
+	recorder *MockPublicKeyMockRecorder
 }
 
 // MockPublicKeyMockRecorder is the mock recorder for MockPublicKey.
-type PublicKeyMockRecorder struct {
+type MockPublicKeyMockRecorder struct {
-	mock *PublicKey
+	mock *MockPublicKey
 }
 
-// NewPublicKey creates a new mock instance.
+// NewMockPublicKey creates a new mock instance.
-func NewPublicKey(ctrl *gomock.Controller) *PublicKey {
+func NewMockPublicKey(ctrl *gomock.Controller) *MockPublicKey {
-	mock := &PublicKey{ctrl: ctrl}
+	mock := &MockPublicKey{ctrl: ctrl}
-	mock.recorder = &PublicKeyMockRecorder{mock}
+	mock.recorder = &MockPublicKeyMockRecorder{mock}
 	return mock
 }
 
 // EXPECT returns an object that allows the caller to indicate expected use.
-func (m *PublicKey) EXPECT() *PublicKeyMockRecorder {
+func (m *MockPublicKey) EXPECT() *MockPublicKeyMockRecorder {
 	return m.recorder
 }
 
 // Aggregate mocks base method.
-func (m *PublicKey) Aggregate(p2 common.PublicKey) common.PublicKey {
+func (m *MockPublicKey) Aggregate(p2 common.PublicKey) common.PublicKey {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Aggregate", p2)
 	ret0, _ := ret[0].(common.PublicKey)
@@ -108,13 +108,13 @@ func (m *PublicKey) Aggregate(p2 common.PublicKey) common.PublicKey {
 }
 
 // Aggregate indicates an expected call of Aggregate.
-func (mr *PublicKeyMockRecorder) Aggregate(p2 interface{}) *gomock.Call {
+func (mr *MockPublicKeyMockRecorder) Aggregate(p2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Aggregate", reflect.TypeOf((*PublicKey)(nil).Aggregate), p2)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Aggregate", reflect.TypeOf((*MockPublicKey)(nil).Aggregate), p2)
 }
 
 // Copy mocks base method.
-func (m *PublicKey) Copy() common.PublicKey {
+func (m *MockPublicKey) Copy() common.PublicKey {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Copy")
 	ret0, _ := ret[0].(common.PublicKey)
@@ -122,13 +122,13 @@ func (m *PublicKey) Copy() common.PublicKey {
 }
 
 // Copy indicates an expected call of Copy.
-func (mr *PublicKeyMockRecorder) Copy() *gomock.Call {
+func (mr *MockPublicKeyMockRecorder) Copy() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Copy", reflect.TypeOf((*PublicKey)(nil).Copy))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Copy", reflect.TypeOf((*MockPublicKey)(nil).Copy))
 }
 
 // Equals mocks base method.
-func (m *PublicKey) Equals(p2 common.PublicKey) bool {
+func (m *MockPublicKey) Equals(p2 common.PublicKey) bool {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Equals", p2)
 	ret0, _ := ret[0].(bool)
@@ -136,13 +136,13 @@ func (m *PublicKey) Equals(p2 common.PublicKey) bool {
 }
 
 // Equals indicates an expected call of Equals.
-func (mr *PublicKeyMockRecorder) Equals(p2 interface{}) *gomock.Call {
+func (mr *MockPublicKeyMockRecorder) Equals(p2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Equals", reflect.TypeOf((*PublicKey)(nil).Equals), p2)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Equals", reflect.TypeOf((*MockPublicKey)(nil).Equals), p2)
 }
 
 // IsInfinite mocks base method.
-func (m *PublicKey) IsInfinite() bool {
+func (m *MockPublicKey) IsInfinite() bool {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "IsInfinite")
 	ret0, _ := ret[0].(bool)
@@ -150,13 +150,13 @@ func (m *PublicKey) IsInfinite() bool {
 }
 
 // IsInfinite indicates an expected call of IsInfinite.
-func (mr *PublicKeyMockRecorder) IsInfinite() *gomock.Call {
+func (mr *MockPublicKeyMockRecorder) IsInfinite() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "IsInfinite", reflect.TypeOf((*PublicKey)(nil).IsInfinite))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "IsInfinite", reflect.TypeOf((*MockPublicKey)(nil).IsInfinite))
 }
 
 // Marshal mocks base method.
-func (m *PublicKey) Marshal() []byte {
+func (m *MockPublicKey) Marshal() []byte {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Marshal")
 	ret0, _ := ret[0].([]byte)
@@ -164,36 +164,36 @@ func (m *PublicKey) Marshal() []byte {
 }
 
 // Marshal indicates an expected call of Marshal.
-func (mr *PublicKeyMockRecorder) Marshal() *gomock.Call {
+func (mr *MockPublicKeyMockRecorder) Marshal() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Marshal", reflect.TypeOf((*PublicKey)(nil).Marshal))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Marshal", reflect.TypeOf((*MockPublicKey)(nil).Marshal))
 }
 
 // MockSignature is a mock of Signature interface.
-type Signature struct {
+type MockSignature struct {
 	ctrl     *gomock.Controller
-	recorder *SignatureMockRecorder
+	recorder *MockSignatureMockRecorder
 }
 
 // MockSignatureMockRecorder is the mock recorder for MockSignature.
-type SignatureMockRecorder struct {
+type MockSignatureMockRecorder struct {
-	mock *Signature
+	mock *MockSignature
 }
 
-// NewSignature creates a new mock instance.
+// NewMockSignature creates a new mock instance.
-func NewSignature(ctrl *gomock.Controller) *Signature {
+func NewMockSignature(ctrl *gomock.Controller) *MockSignature {
-	mock := &Signature{ctrl: ctrl}
+	mock := &MockSignature{ctrl: ctrl}
-	mock.recorder = &SignatureMockRecorder{mock}
+	mock.recorder = &MockSignatureMockRecorder{mock}
 	return mock
 }
 
 // EXPECT returns an object that allows the caller to indicate expected use.
-func (m *Signature) EXPECT() *SignatureMockRecorder {
+func (m *MockSignature) EXPECT() *MockSignatureMockRecorder {
 	return m.recorder
 }
 
 // AggregateVerify mocks base method.
-func (m *Signature) AggregateVerify(pubKeys []common.PublicKey, msgs [][32]byte) bool {
+func (m *MockSignature) AggregateVerify(pubKeys []common.PublicKey, msgs [][32]byte) bool {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "AggregateVerify", pubKeys, msgs)
 	ret0, _ := ret[0].(bool)
@@ -201,13 +201,13 @@ func (m *Signature) AggregateVerify(pubKeys []common.PublicKey, msgs [][32]byte)
 }
 
 // AggregateVerify indicates an expected call of AggregateVerify.
-func (mr *SignatureMockRecorder) AggregateVerify(pubKeys, msgs interface{}) *gomock.Call {
+func (mr *MockSignatureMockRecorder) AggregateVerify(pubKeys, msgs interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AggregateVerify", reflect.TypeOf((*Signature)(nil).AggregateVerify), pubKeys, msgs)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AggregateVerify", reflect.TypeOf((*MockSignature)(nil).AggregateVerify), pubKeys, msgs)
 }
 
 // Copy mocks base method.
-func (m *Signature) Copy() common.Signature {
+func (m *MockSignature) Copy() common.Signature {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Copy")
 	ret0, _ := ret[0].(common.Signature)
@@ -215,13 +215,13 @@ func (m *Signature) Copy() common.Signature {
 }
 
 // Copy indicates an expected call of Copy.
-func (mr *SignatureMockRecorder) Copy() *gomock.Call {
+func (mr *MockSignatureMockRecorder) Copy() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Copy", reflect.TypeOf((*Signature)(nil).Copy))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Copy", reflect.TypeOf((*MockSignature)(nil).Copy))
 }
 
 // Eth2FastAggregateVerify mocks base method.
-func (m *Signature) Eth2FastAggregateVerify(pubKeys []common.PublicKey, msg [32]byte) bool {
+func (m *MockSignature) Eth2FastAggregateVerify(pubKeys []common.PublicKey, msg [32]byte) bool {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Eth2FastAggregateVerify", pubKeys, msg)
 	ret0, _ := ret[0].(bool)
@@ -229,13 +229,13 @@ func (m *Signature) Eth2FastAggregateVerify(pubKeys []common.PublicKey, msg [32]
 }
 
 // Eth2FastAggregateVerify indicates an expected call of Eth2FastAggregateVerify.
-func (mr *SignatureMockRecorder) Eth2FastAggregateVerify(pubKeys, msg interface{}) *gomock.Call {
+func (mr *MockSignatureMockRecorder) Eth2FastAggregateVerify(pubKeys, msg interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Eth2FastAggregateVerify", reflect.TypeOf((*Signature)(nil).Eth2FastAggregateVerify), pubKeys, msg)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Eth2FastAggregateVerify", reflect.TypeOf((*MockSignature)(nil).Eth2FastAggregateVerify), pubKeys, msg)
 }
 
 // FastAggregateVerify mocks base method.
-func (m *Signature) FastAggregateVerify(pubKeys []common.PublicKey, msg [32]byte) bool {
+func (m *MockSignature) FastAggregateVerify(pubKeys []common.PublicKey, msg [32]byte) bool {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "FastAggregateVerify", pubKeys, msg)
 	ret0, _ := ret[0].(bool)
@@ -243,13 +243,13 @@ func (m *Signature) FastAggregateVerify(pubKeys []common.PublicKey, msg [32]byte
 }
 
 // FastAggregateVerify indicates an expected call of FastAggregateVerify.
-func (mr *SignatureMockRecorder) FastAggregateVerify(pubKeys, msg interface{}) *gomock.Call {
+func (mr *MockSignatureMockRecorder) FastAggregateVerify(pubKeys, msg interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FastAggregateVerify", reflect.TypeOf((*Signature)(nil).FastAggregateVerify), pubKeys, msg)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FastAggregateVerify", reflect.TypeOf((*MockSignature)(nil).FastAggregateVerify), pubKeys, msg)
 }
 
 // Marshal mocks base method.
-func (m *Signature) Marshal() []byte {
+func (m *MockSignature) Marshal() []byte {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Marshal")
 	ret0, _ := ret[0].([]byte)
@@ -257,13 +257,13 @@ func (m *Signature) Marshal() []byte {
 }
 
 // Marshal indicates an expected call of Marshal.
-func (mr *SignatureMockRecorder) Marshal() *gomock.Call {
+func (mr *MockSignatureMockRecorder) Marshal() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Marshal", reflect.TypeOf((*Signature)(nil).Marshal))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Marshal", reflect.TypeOf((*MockSignature)(nil).Marshal))
 }
 
 // Verify mocks base method.
-func (m *Signature) Verify(pubKey common.PublicKey, msg []byte) bool {
+func (m *MockSignature) Verify(pubKey common.PublicKey, msg []byte) bool {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Verify", pubKey, msg)
 	ret0, _ := ret[0].(bool)
@@ -271,7 +271,7 @@ func (m *Signature) Verify(pubKey common.PublicKey, msg []byte) bool {
 }
 
 // Verify indicates an expected call of Verify.
-func (mr *SignatureMockRecorder) Verify(pubKey, msg interface{}) *gomock.Call {
+func (mr *MockSignatureMockRecorder) Verify(pubKey, msg interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Verify", reflect.TypeOf((*Signature)(nil).Verify), pubKey, msg)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Verify", reflect.TypeOf((*MockSignature)(nil).Verify), pubKey, msg)
 }

testing/validator-mock/validator_client_mock.go

@@ -11,6 +11,7 @@ import (
 	gomock "github.com/golang/mock/gomock"
 	primitives "github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	iface "github.com/prysmaticlabs/prysm/v4/validator/client/iface"
 	emptypb "google.golang.org/protobuf/types/known/emptypb"
 )
 
@@ -81,6 +82,21 @@ func (mr *MockValidatorClientMockRecorder) EventStreamIsRunning() *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "EventStreamIsRunning", reflect.TypeOf((*MockValidatorClient)(nil).EventStreamIsRunning))
 }
 
+// GetAggregatedSelections mocks base method.
+func (m *MockValidatorClient) GetAggregatedSelections(arg0 context.Context, arg1 []iface.BeaconCommitteeSelection) ([]iface.BeaconCommitteeSelection, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetAggregatedSelections", arg0, arg1)
+	ret0, _ := ret[0].([]iface.BeaconCommitteeSelection)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// GetAggregatedSelections indicates an expected call of GetAggregatedSelections.
+func (mr *MockValidatorClientMockRecorder) GetAggregatedSelections(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetAggregatedSelections", reflect.TypeOf((*MockValidatorClient)(nil).GetAggregatedSelections), arg0, arg1)
+}
+
 // GetAttestationData mocks base method.
 func (m *MockValidatorClient) GetAttestationData(arg0 context.Context, arg1 *eth.AttestationDataRequest) (*eth.AttestationData, error) {
 	m.ctrl.T.Helper()

validator/client/aggregate.go

@@ -53,13 +53,25 @@ func (v *validator) SubmitAggregateAndProof(ctx context.Context, slot primitives
 	v.aggregatedSlotCommitteeIDCache.Add(k, true)
 	v.aggregatedSlotCommitteeIDCacheLock.Unlock()
 
-	slotSig, err := v.signSlotWithSelectionProof(ctx, pubKey, slot)
+	var slotSig []byte
-	if err != nil {
+	if v.distributed {
-		log.WithError(err).Error("Could not sign slot")
+		slotSig, err = v.getAttSelection(attSelectionKey{slot: slot, index: duty.ValidatorIndex})
-		if v.emitAccountMetrics {
+		if err != nil {
-			ValidatorAggFailVec.WithLabelValues(fmtKey).Inc()
+			log.WithError(err).Error("Could not find aggregated selection proof")
+			if v.emitAccountMetrics {
+				ValidatorAggFailVec.WithLabelValues(fmtKey).Inc()
+			}
+			return
+		}
+	} else {
+		slotSig, err = v.signSlotWithSelectionProof(ctx, pubKey, slot)
+		if err != nil {
+			log.WithError(err).Error("Could not sign slot")
+			if v.emitAccountMetrics {
+				ValidatorAggFailVec.WithLabelValues(fmtKey).Inc()
+			}
+			return
 		}
-		return
 	}
 
 	// As specified in spec, an aggregator should wait until two thirds of the way through slot

validator/client/aggregate_test.go

@@ -5,6 +5,8 @@ import (
 	"errors"
 	"testing"
 
+	"github.com/prysmaticlabs/prysm/v4/validator/client/iface"
+
 	"github.com/golang/mock/gomock"
 	"github.com/prysmaticlabs/go-bitfield"
 	fieldparams "github.com/prysmaticlabs/prysm/v4/config/fieldparams"
@@ -116,6 +118,63 @@ func TestSubmitAggregateAndProof_Ok(t *testing.T) {
 	validator.SubmitAggregateAndProof(context.Background(), 0, pubKey)
 }
 
+func TestSubmitAggregateAndProof_Distributed(t *testing.T) {
+	validatorIdx := primitives.ValidatorIndex(123)
+	slot := primitives.Slot(456)
+	ctx := context.Background()
+
+	validator, m, validatorKey, finish := setup(t)
+	defer finish()
+
+	var pubKey [fieldparams.BLSPubkeyLength]byte
+	copy(pubKey[:], validatorKey.PublicKey().Marshal())
+	validator.duties = &ethpb.DutiesResponse{
+		CurrentEpochDuties: []*ethpb.DutiesResponse_Duty{
+			{
+				PublicKey:      validatorKey.PublicKey().Marshal(),
+				ValidatorIndex: validatorIdx,
+				AttesterSlot:   slot,
+			},
+		},
+	}
+
+	validator.distributed = true
+	validator.attSelections = make(map[attSelectionKey]iface.BeaconCommitteeSelection)
+	validator.attSelections[attSelectionKey{
+		slot:  slot,
+		index: 123,
+	}] = iface.BeaconCommitteeSelection{
+		SelectionProof: make([]byte, 96),
+		Slot:           slot,
+		ValidatorIndex: validatorIdx,
+	}
+
+	m.validatorClient.EXPECT().SubmitAggregateSelectionProof(
+		gomock.Any(), // ctx
+		gomock.AssignableToTypeOf(&ethpb.AggregateSelectionRequest{}),
+	).Return(&ethpb.AggregateSelectionResponse{
+		AggregateAndProof: &ethpb.AggregateAttestationAndProof{
+			AggregatorIndex: 0,
+			Aggregate: util.HydrateAttestation(&ethpb.Attestation{
+				AggregationBits: make([]byte, 1),
+			}),
+			SelectionProof: make([]byte, 96),
+		},
+	}, nil)
+
+	m.validatorClient.EXPECT().DomainData(
+		gomock.Any(), // ctx
+		gomock.Any(), // epoch
+	).Return(&ethpb.DomainResponse{SignatureDomain: make([]byte, 32)}, nil /*err*/)
+
+	m.validatorClient.EXPECT().SubmitSignedAggregateSelectionProof(
+		gomock.Any(), // ctx
+		gomock.AssignableToTypeOf(&ethpb.SignedAggregateSubmitRequest{}),
+	).Return(&ethpb.SignedAggregateSubmitResponse{AttestationDataRoot: make([]byte, 32)}, nil)
+
+	validator.SubmitAggregateAndProof(ctx, slot, pubKey)
+}
+
 func TestWaitForSlotTwoThird_WaitCorrectly(t *testing.T) {
 	validator, _, _, finish := setup(t)
 	defer finish()

validator/client/beacon-api/BUILD.bazel

@@ -12,6 +12,7 @@ go_library(
         "beacon_block_converter.go",
         "beacon_block_json_helpers.go",
         "beacon_block_proto_helpers.go",
+        "beacon_committee_selections.go",
         "domain_data.go",
         "doppelganger.go",
         "duties.go",
@@ -77,6 +78,7 @@ go_test(
         "beacon_block_converter_test.go",
         "beacon_block_json_helpers_test.go",
         "beacon_block_proto_helpers_test.go",
+        "beacon_committee_selections_test.go",
         "domain_data_test.go",
         "doppelganger_test.go",
         "duties_test.go",

validator/client/beacon-api/activation_test.go

@@ -290,6 +290,14 @@ func TestActivation_JsonResponseError(t *testing.T) {
 		errors.New("some specific json error"),
 	).Times(1)
 
+	jsonRestHandler.EXPECT().Get(
+		ctx,
+		gomock.Any(),
+		gomock.Any(),
+	).Return(
+		errors.New("some specific json error"),
+	).Times(1)
+
 	validatorClient := beaconApiValidatorClient{
 		stateValidatorsProvider: beaconApiStateValidatorsProvider{
 			jsonRestHandler: jsonRestHandler,

validator/client/beacon-api/beacon_api_validator_client.go

@@ -175,3 +175,7 @@ func (c *beaconApiValidatorClient) StartEventStream(ctx context.Context) error {
 func (c *beaconApiValidatorClient) EventStreamIsRunning() bool {
 	return c.eventHandler.running
 }
+
+func (c *beaconApiValidatorClient) GetAggregatedSelections(ctx context.Context, selections []iface.BeaconCommitteeSelection) ([]iface.BeaconCommitteeSelection, error) {
+	return c.getAggregatedSelection(ctx, selections)
+}

validator/client/beacon-api/beacon_committee_selections.go

@@ -0,0 +1,36 @@
+package beacon_api
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+
+	"github.com/prysmaticlabs/prysm/v4/validator/client/iface"
+
+	"github.com/pkg/errors"
+)
+
+type aggregatedSelectionResponse struct {
+	Data []iface.BeaconCommitteeSelection `json:"data"`
+}
+
+func (c *beaconApiValidatorClient) getAggregatedSelection(ctx context.Context, selections []iface.BeaconCommitteeSelection) ([]iface.BeaconCommitteeSelection, error) {
+	body, err := json.Marshal(selections)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to marshal selections")
+	}
+
+	var resp aggregatedSelectionResponse
+	err = c.jsonRestHandler.Post(ctx, "/eth/v1/validator/beacon_committee_selections", nil, bytes.NewBuffer(body), &resp)
+	if err != nil {
+		return nil, errors.Wrap(err, "error calling post endpoint")
+	}
+	if len(resp.Data) == 0 {
+		return nil, errors.New("no aggregated selection returned")
+	}
+	if len(selections) != len(resp.Data) {
+		return nil, errors.New("mismatching number of selections")
+	}
+
+	return resp.Data, nil
+}

validator/client/beacon-api/beacon_committee_selections_test.go

@@ -0,0 +1,124 @@
+package beacon_api
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/v4/validator/client/iface"
+
+	"github.com/golang/mock/gomock"
+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v4/testing/require"
+	"github.com/prysmaticlabs/prysm/v4/validator/client/beacon-api/mock"
+	test_helpers "github.com/prysmaticlabs/prysm/v4/validator/client/beacon-api/test-helpers"
+)
+
+func TestGetAggregatedSelections(t *testing.T) {
+	testcases := []struct {
+		name                 string
+		req                  []iface.BeaconCommitteeSelection
+		res                  []iface.BeaconCommitteeSelection
+		endpointError        error
+		expectedErrorMessage string
+	}{
+		{
+			name: "valid",
+			req: []iface.BeaconCommitteeSelection{
+				{
+					SelectionProof: test_helpers.FillByteSlice(96, 82),
+					Slot:           75,
+					ValidatorIndex: 76,
+				},
+			},
+			res: []iface.BeaconCommitteeSelection{
+				{
+					SelectionProof: test_helpers.FillByteSlice(96, 100),
+					Slot:           75,
+					ValidatorIndex: 76,
+				},
+			},
+		},
+		{
+			name: "endpoint error",
+			req: []iface.BeaconCommitteeSelection{
+				{
+					SelectionProof: test_helpers.FillByteSlice(96, 82),
+					Slot:           75,
+					ValidatorIndex: 76,
+				},
+			},
+			endpointError:        errors.New("bad request"),
+			expectedErrorMessage: "bad request",
+		},
+		{
+			name: "no response error",
+			req: []iface.BeaconCommitteeSelection{
+				{
+					SelectionProof: test_helpers.FillByteSlice(96, 82),
+					Slot:           75,
+					ValidatorIndex: 76,
+				},
+			},
+			expectedErrorMessage: "no aggregated selection returned",
+		},
+		{
+			name: "mismatch response",
+			req: []iface.BeaconCommitteeSelection{
+				{
+					SelectionProof: test_helpers.FillByteSlice(96, 82),
+					Slot:           75,
+					ValidatorIndex: 76,
+				},
+				{
+					SelectionProof: test_helpers.FillByteSlice(96, 102),
+					Slot:           75,
+					ValidatorIndex: 79,
+				},
+			},
+			res: []iface.BeaconCommitteeSelection{
+				{
+					SelectionProof: test_helpers.FillByteSlice(96, 100),
+					Slot:           75,
+					ValidatorIndex: 76,
+				},
+			},
+			expectedErrorMessage: "mismatching number of selections",
+		},
+	}
+
+	for _, test := range testcases {
+		t.Run(test.name, func(t *testing.T) {
+			ctrl := gomock.NewController(t)
+			jsonRestHandler := mock.NewMockJsonRestHandler(ctrl)
+
+			reqBody, err := json.Marshal(test.req)
+			require.NoError(t, err)
+
+			ctx := context.Background()
+			jsonRestHandler.EXPECT().Post(
+				ctx,
+				"/eth/v1/validator/beacon_committee_selections",
+				nil,
+				bytes.NewBuffer(reqBody),
+				&aggregatedSelectionResponse{},
+			).SetArg(
+				4,
+				aggregatedSelectionResponse{Data: test.res},
+			).Return(
+				test.endpointError,
+			).Times(1)
+
+			validatorClient := &beaconApiValidatorClient{jsonRestHandler: jsonRestHandler}
+			res, err := validatorClient.GetAggregatedSelections(ctx, test.req)
+			if test.expectedErrorMessage != "" {
+				require.ErrorContains(t, test.expectedErrorMessage, err)
+				return
+			}
+
+			require.NoError(t, err)
+			require.DeepEqual(t, test.res, res)
+		})
+	}
+}

validator/client/beacon-api/index_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"net/url"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -26,6 +27,7 @@ func getPubKeyAndReqBuffer(t *testing.T) ([]byte, *bytes.Buffer) {
 		Ids:      []string{stringPubKey},
 		Statuses: []string{},
 	}
+
 	reqBytes, err := json.Marshal(req)
 	require.NoError(t, err)
 	return pubKey, bytes.NewBuffer(reqBytes)
@@ -192,6 +194,27 @@ func TestIndex_JsonResponseError(t *testing.T) {
 		errors.New("some specific json error"),
 	).Times(1)
 
+	req := structs.GetValidatorsRequest{
+		Ids:      []string{stringPubKey},
+		Statuses: []string{},
+	}
+
+	queryParams := url.Values{}
+	for _, id := range req.Ids {
+		queryParams.Add("id", id)
+	}
+	for _, st := range req.Statuses {
+		queryParams.Add("status", st)
+	}
+
+	jsonRestHandler.EXPECT().Get(
+		ctx,
+		buildURL("/eth/v1/beacon/states/head/validators", queryParams),
+		&stateValidatorsResponseJson,
+	).Return(
+		errors.New("some specific json error"),
+	).Times(1)
+
 	validatorClient := beaconApiValidatorClient{
 		stateValidatorsProvider: beaconApiStateValidatorsProvider{
 			jsonRestHandler: jsonRestHandler,

validator/client/beacon-api/mock/beacon_block_converter_mock.go

@@ -8,7 +8,7 @@ import (
 	reflect "reflect"
 
 	gomock "github.com/golang/mock/gomock"
-	"github.com/prysmaticlabs/prysm/v4/api/server/structs"
+	structs "github.com/prysmaticlabs/prysm/v4/api/server/structs"
 	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 )
 

validator/client/beacon-api/mock/duties_mock.go

@@ -9,7 +9,7 @@ import (
 	reflect "reflect"
 
 	gomock "github.com/golang/mock/gomock"
-	"github.com/prysmaticlabs/prysm/v4/api/server/structs"
+	structs "github.com/prysmaticlabs/prysm/v4/api/server/structs"
 	primitives "github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 )
 

validator/client/beacon-api/mock/genesis_mock.go

@@ -1,5 +1,5 @@
 // Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/prysmaticlabs/prysm/v4/validator/client/beacon-api (interfaces: GenesisProvider)
+// Source: validator/client/beacon-api/genesis.go
 
 // Package mock is a generated GoMock package.
 package mock
@@ -9,7 +9,7 @@ import (
 	reflect "reflect"
 
 	gomock "github.com/golang/mock/gomock"
-	"github.com/prysmaticlabs/prysm/v4/api/server/structs"
+	structs "github.com/prysmaticlabs/prysm/v4/api/server/structs"
 )
 
 // MockGenesisProvider is a mock of GenesisProvider interface.
@@ -36,16 +36,16 @@ func (m *MockGenesisProvider) EXPECT() *MockGenesisProviderMockRecorder {
 }
 
 // GetGenesis mocks base method.
-func (m *MockGenesisProvider) GetGenesis(arg0 context.Context) (*structs.Genesis, error) {
+func (m *MockGenesisProvider) GetGenesis(ctx context.Context) (*structs.Genesis, error) {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "GetGenesis", arg0)
+	ret := m.ctrl.Call(m, "GetGenesis", ctx)
 	ret0, _ := ret[0].(*structs.Genesis)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
 // GetGenesis indicates an expected call of GetGenesis.
-func (mr *MockGenesisProviderMockRecorder) GetGenesis(arg0 interface{}) *gomock.Call {
+func (mr *MockGenesisProviderMockRecorder) GetGenesis(ctx interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetGenesis", reflect.TypeOf((*MockGenesisProvider)(nil).GetGenesis), arg0)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetGenesis", reflect.TypeOf((*MockGenesisProvider)(nil).GetGenesis), ctx)
 }

validator/client/beacon-api/mock/json_rest_handler_mock.go

@@ -1,5 +1,5 @@
 // Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/prysmaticlabs/prysm/v4/validator/client/beacon-api (interfaces: JsonRestHandler)
+// Source: validator/client/beacon-api/json_rest_handler.go
 
 // Package mock is a generated GoMock package.
 package mock
@@ -36,29 +36,29 @@ func (m *MockJsonRestHandler) EXPECT() *MockJsonRestHandlerMockRecorder {
 }
 
 // Get mocks base method.
-func (m *MockJsonRestHandler) Get(arg0 context.Context, arg1 string, arg2 interface{}) error {
+func (m *MockJsonRestHandler) Get(ctx context.Context, endpoint string, resp interface{}) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Get", arg0, arg1, arg2)
+	ret := m.ctrl.Call(m, "Get", ctx, endpoint, resp)
 	ret0, _ := ret[0].(error)
 	return ret0
 }
 
 // Get indicates an expected call of Get.
-func (mr *MockJsonRestHandlerMockRecorder) Get(arg0, arg1, arg2 interface{}) *gomock.Call {
+func (mr *MockJsonRestHandlerMockRecorder) Get(ctx, endpoint, resp interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Get", reflect.TypeOf((*MockJsonRestHandler)(nil).Get), arg0, arg1, arg2)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Get", reflect.TypeOf((*MockJsonRestHandler)(nil).Get), ctx, endpoint, resp)
 }
 
 // Post mocks base method.
-func (m *MockJsonRestHandler) Post(arg0 context.Context, arg1 string, arg2 map[string]string, arg3 *bytes.Buffer, arg4 interface{}) error {
+func (m *MockJsonRestHandler) Post(ctx context.Context, endpoint string, headers map[string]string, data *bytes.Buffer, resp interface{}) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Post", arg0, arg1, arg2, arg3, arg4)
+	ret := m.ctrl.Call(m, "Post", ctx, endpoint, headers, data, resp)
 	ret0, _ := ret[0].(error)
 	return ret0
 }
 
 // Post indicates an expected call of Post.
-func (mr *MockJsonRestHandlerMockRecorder) Post(arg0, arg1, arg2, arg3, arg4 interface{}) *gomock.Call {
+func (mr *MockJsonRestHandlerMockRecorder) Post(ctx, endpoint, headers, data, resp interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Post", reflect.TypeOf((*MockJsonRestHandler)(nil).Post), arg0, arg1, arg2, arg3, arg4)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Post", reflect.TypeOf((*MockJsonRestHandler)(nil).Post), ctx, endpoint, headers, data, resp)
 }

validator/client/beacon-api/mock/state_validators_mock.go

@@ -9,7 +9,7 @@ import (
 	reflect "reflect"
 
 	gomock "github.com/golang/mock/gomock"
-	"github.com/prysmaticlabs/prysm/v4/api/server/structs"
+	structs "github.com/prysmaticlabs/prysm/v4/api/server/structs"
 	primitives "github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 )
 

validator/client/beacon-api/state_validators.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"net/url"
 	"strconv"
 
 	"github.com/pkg/errors"
@@ -91,7 +92,31 @@ func (c beaconApiStateValidatorsProvider) getStateValidatorsHelper(
 		return nil, errors.Wrapf(err, "failed to marshal request into JSON")
 	}
 	stateValidatorsJson := &structs.GetValidatorsResponse{}
-	if err = c.jsonRestHandler.Post(ctx, endpoint, nil, bytes.NewBuffer(reqBytes), stateValidatorsJson); err != nil {
+	// First try POST endpoint to check whether it is supported by the beacon node.
+	if err = c.jsonRestHandler.Post(ctx, endpoint, nil, bytes.NewBuffer(reqBytes), stateValidatorsJson); err == nil {
+		if stateValidatorsJson.Data == nil {
+			return nil, errors.New("stateValidatorsJson.Data is nil")
+		}
+
+		return stateValidatorsJson, nil
+	}
+
+	// Re-initialise the response just in case.
+	stateValidatorsJson = &structs.GetValidatorsResponse{}
+
+	// Seems like POST isn't supported by the beacon node, let's try the GET one.
+	queryParams := url.Values{}
+	for _, id := range req.Ids {
+		queryParams.Add("id", id)
+	}
+	for _, st := range req.Statuses {
+		queryParams.Add("status", st)
+	}
+
+	query := buildURL(endpoint, queryParams)
+
+	err = c.jsonRestHandler.Get(ctx, query, stateValidatorsJson)
+	if err != nil {
 		return nil, err
 	}
 

validator/client/beacon-api/state_validators_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"net/url"
 	"testing"
 
 	"github.com/golang/mock/gomock"
@@ -15,7 +16,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/validator/client/beacon-api/mock"
 )
 
-func TestGetStateValidators_Nominal(t *testing.T) {
+func TestGetStateValidators_Nominal_POST(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
 
@@ -101,6 +102,112 @@ func TestGetStateValidators_Nominal(t *testing.T) {
 	assert.DeepEqual(t, wanted, actual.Data)
 }
 
+func TestGetStateValidators_Nominal_GET(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	req := &structs.GetValidatorsRequest{
+		Ids: []string{
+			"12345",
+			"0x8000091c2ae64ee414a54c1cc1fc67dec663408bc636cb86756e0200e41a75c8f86603f104f02c856983d2783116be13",
+			"0x80000e851c0f53c3246ff726d7ff7766661ca5e12a07c45c114d208d54f0f8233d4380b2e9aff759d69795d1df905526",
+			"0x424242424242424242424242424242424242424242424242424242424242424242424242424242424242424242424242",
+			"0x800015473bdc3a7f45ef8eb8abc598bc20021e55ad6e6ad1d745aaef9730dd2c28ec08bf42df18451de94dd4a6d24ec5",
+		},
+		Statuses: []string{"active_ongoing", "active_exiting", "exited_slashed", "exited_unslashed"},
+	}
+	reqBytes, err := json.Marshal(req)
+	require.NoError(t, err)
+
+	stateValidatorsResponseJson := structs.GetValidatorsResponse{}
+	jsonRestHandler := mock.NewMockJsonRestHandler(ctrl)
+
+	wanted := []*structs.ValidatorContainer{
+		{
+			Index:  "12345",
+			Status: "active_ongoing",
+			Validator: &structs.Validator{
+				Pubkey: "0x8000091c2ae64ee414a54c1cc1fc67dec663408bc636cb86756e0200e41a75c8f86603f104f02c856983d2783116be19",
+			},
+		},
+		{
+			Index:  "55293",
+			Status: "active_ongoing",
+			Validator: &structs.Validator{
+				Pubkey: "0x8000091c2ae64ee414a54c1cc1fc67dec663408bc636cb86756e0200e41a75c8f86603f104f02c856983d2783116be13",
+			},
+		},
+		{
+			Index:  "55294",
+			Status: "active_exiting",
+			Validator: &structs.Validator{
+				Pubkey: "0x80000e851c0f53c3246ff726d7ff7766661ca5e12a07c45c114d208d54f0f8233d4380b2e9aff759d69795d1df905526",
+			},
+		},
+		{
+			Index:  "55295",
+			Status: "exited_slashed",
+			Validator: &structs.Validator{
+				Pubkey: "0x800015473bdc3a7f45ef8eb8abc598bc20021e55ad6e6ad1d745aaef9730dd2c28ec08bf42df18451de94dd4a6d24ec5",
+			},
+		},
+	}
+
+	ctx := context.Background()
+
+	// First return an error from POST call.
+	jsonRestHandler.EXPECT().Post(
+		ctx,
+		"/eth/v1/beacon/states/head/validators",
+		nil,
+		bytes.NewBuffer(reqBytes),
+		&stateValidatorsResponseJson,
+	).Return(
+		errors.New("an error"),
+	).Times(1)
+
+	// Then try the GET call which will be successful.
+	queryParams := url.Values{}
+	for _, id := range req.Ids {
+		queryParams.Add("id", id)
+	}
+	for _, st := range req.Statuses {
+		queryParams.Add("status", st)
+	}
+
+	query := buildURL("/eth/v1/beacon/states/head/validators", queryParams)
+
+	jsonRestHandler.EXPECT().Get(
+		ctx,
+		query,
+		&stateValidatorsResponseJson,
+	).Return(
+		nil,
+	).SetArg(
+		2,
+		structs.GetValidatorsResponse{
+			Data: wanted,
+		},
+	).Times(1)
+
+	stateValidatorsProvider := beaconApiStateValidatorsProvider{jsonRestHandler: jsonRestHandler}
+	actual, err := stateValidatorsProvider.GetStateValidators(ctx, []string{
+		"0x8000091c2ae64ee414a54c1cc1fc67dec663408bc636cb86756e0200e41a75c8f86603f104f02c856983d2783116be13", // active_ongoing
+		"0x80000e851c0f53c3246ff726d7ff7766661ca5e12a07c45c114d208d54f0f8233d4380b2e9aff759d69795d1df905526", // active_exiting
+		"0x424242424242424242424242424242424242424242424242424242424242424242424242424242424242424242424242", // does not exist
+		"0x8000091c2ae64ee414a54c1cc1fc67dec663408bc636cb86756e0200e41a75c8f86603f104f02c856983d2783116be13", // active_ongoing - duplicate
+		"0x800015473bdc3a7f45ef8eb8abc598bc20021e55ad6e6ad1d745aaef9730dd2c28ec08bf42df18451de94dd4a6d24ec5", // exited_slashed
+	},
+		[]primitives.ValidatorIndex{
+			12345, // active_ongoing
+			12345, // active_ongoing - duplicate
+		},
+		[]string{"active_ongoing", "active_exiting", "exited_slashed", "exited_unslashed"},
+	)
+	require.NoError(t, err)
+	assert.DeepEqual(t, wanted, actual.Data)
+}
+
 func TestGetStateValidators_GetRestJsonResponseOnError(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
@@ -117,6 +224,7 @@ func TestGetStateValidators_GetRestJsonResponseOnError(t *testing.T) {
 
 	ctx := context.Background()
 
+	// First call POST.
 	jsonRestHandler.EXPECT().Post(
 		ctx,
 		"/eth/v1/beacon/states/head/validators",
@@ -127,6 +235,25 @@ func TestGetStateValidators_GetRestJsonResponseOnError(t *testing.T) {
 		errors.New("an error"),
 	).Times(1)
 
+	// Call to GET endpoint upon receiving error from POST call.
+	queryParams := url.Values{}
+	for _, id := range req.Ids {
+		queryParams.Add("id", id)
+	}
+	for _, st := range req.Statuses {
+		queryParams.Add("status", st)
+	}
+
+	query := buildURL("/eth/v1/beacon/states/head/validators", queryParams)
+
+	jsonRestHandler.EXPECT().Get(
+		ctx,
+		query,
+		&stateValidatorsResponseJson,
+	).Return(
+		errors.New("an error"),
+	).Times(1)
+
 	stateValidatorsProvider := beaconApiStateValidatorsProvider{jsonRestHandler: jsonRestHandler}
 	_, err = stateValidatorsProvider.GetStateValidators(ctx, []string{
 		"0x8000091c2ae64ee414a54c1cc1fc67dec663408bc636cb86756e0200e41a75c8f86603f104f02c856983d2783116be13", // active_ongoing
@@ -137,7 +264,7 @@ func TestGetStateValidators_GetRestJsonResponseOnError(t *testing.T) {
 	assert.ErrorContains(t, "an error", err)
 }
 
-func TestGetStateValidators_DataIsNil(t *testing.T) {
+func TestGetStateValidators_DataIsNil_POST(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
 
@@ -175,3 +302,63 @@ func TestGetStateValidators_DataIsNil(t *testing.T) {
 	)
 	assert.ErrorContains(t, "stateValidatorsJson.Data is nil", err)
 }
+
+func TestGetStateValidators_DataIsNil_GET(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	req := &structs.GetValidatorsRequest{
+		Ids:      []string{"0x8000091c2ae64ee414a54c1cc1fc67dec663408bc636cb86756e0200e41a75c8f86603f104f02c856983d2783116be13"},
+		Statuses: []string{},
+	}
+	reqBytes, err := json.Marshal(req)
+	require.NoError(t, err)
+
+	ctx := context.Background()
+	stateValidatorsResponseJson := structs.GetValidatorsResponse{}
+	jsonRestHandler := mock.NewMockJsonRestHandler(ctrl)
+
+	// First call POST which will return an error.
+	jsonRestHandler.EXPECT().Post(
+		ctx,
+		"/eth/v1/beacon/states/head/validators",
+		nil,
+		bytes.NewBuffer(reqBytes),
+		&stateValidatorsResponseJson,
+	).Return(
+		errors.New("an error"),
+	).Times(1)
+
+	// Then call GET which returns nil Data.
+	queryParams := url.Values{}
+	for _, id := range req.Ids {
+		queryParams.Add("id", id)
+	}
+	for _, st := range req.Statuses {
+		queryParams.Add("status", st)
+	}
+
+	query := buildURL("/eth/v1/beacon/states/head/validators", queryParams)
+
+	jsonRestHandler.EXPECT().Get(
+		ctx,
+		query,
+		&stateValidatorsResponseJson,
+	).Return(
+		nil,
+	).SetArg(
+		2,
+		structs.GetValidatorsResponse{
+			Data: nil,
+		},
+	).Times(1)
+
+	stateValidatorsProvider := beaconApiStateValidatorsProvider{jsonRestHandler: jsonRestHandler}
+	_, err = stateValidatorsProvider.GetStateValidators(ctx, []string{
+		"0x8000091c2ae64ee414a54c1cc1fc67dec663408bc636cb86756e0200e41a75c8f86603f104f02c856983d2783116be13", // active_ongoing
+	},
+		nil,
+		nil,
+	)
+	assert.ErrorContains(t, "stateValidatorsJson.Data is nil", err)
+}

validator/client/beacon-api/submit_aggregate_selection_proof_test.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"net/url"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -201,6 +202,27 @@ func TestSubmitAggregateSelectionProof(t *testing.T) {
 				test.validatorsErr,
 			).Times(test.validatorsCalled)
 
+			if test.validatorsErr != nil {
+				// Then try the GET call which will also return error.
+				queryParams := url.Values{}
+				for _, id := range valsReq.Ids {
+					queryParams.Add("id", id)
+				}
+				for _, st := range valsReq.Statuses {
+					queryParams.Add("status", st)
+				}
+
+				query := buildURL("/eth/v1/beacon/states/head/validators", queryParams)
+
+				jsonRestHandler.EXPECT().Get(
+					ctx,
+					query,
+					&structs.GetValidatorsResponse{},
+				).Return(
+					test.validatorsErr,
+				).Times(1)
+			}
+
 			// Call attester duties endpoint to get attester duties.
 			validatorIndicesBytes, err := json.Marshal([]string{validatorIndex})
 			require.NoError(t, err)

validator/client/beacon-api/sync_committee_test.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"net/url"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -337,6 +338,27 @@ func TestGetSyncSubCommitteeIndex(t *testing.T) {
 				test.validatorsErr,
 			).Times(1)
 
+			if test.validatorsErr != nil {
+				// Then try the GET call which will also return error.
+				queryParams := url.Values{}
+				for _, id := range valsReq.Ids {
+					queryParams.Add("id", id)
+				}
+				for _, st := range valsReq.Statuses {
+					queryParams.Add("status", st)
+				}
+
+				query := buildURL("/eth/v1/beacon/states/head/validators", queryParams)
+
+				jsonRestHandler.EXPECT().Get(
+					ctx,
+					query,
+					&structs.GetValidatorsResponse{},
+				).Return(
+					test.validatorsErr,
+				).Times(1)
+			}
+
 			validatorIndicesBytes, err := json.Marshal([]string{validatorIndex})
 			require.NoError(t, err)
 

validator/client/grpc-api/grpc_validator_client.go

@@ -138,6 +138,10 @@ func (c *grpcValidatorClient) AggregatedSigAndAggregationBits(
 	return c.beaconNodeValidatorClient.AggregatedSigAndAggregationBits(ctx, in)
 }
 
+func (grpcValidatorClient) GetAggregatedSelections(context.Context, []iface.BeaconCommitteeSelection) ([]iface.BeaconCommitteeSelection, error) {
+	return nil, iface.ErrNotSupported
+}
+
 func NewGrpcValidatorClient(cc grpc.ClientConnInterface) iface.ValidatorClient {
 	return &grpcValidatorClient{ethpb.NewBeaconNodeValidatorClient(cc)}
 }

validator/client/iface/BUILD.bazel

@@ -20,6 +20,7 @@ go_library(
         "//proto/prysm/v1alpha1:go_default_library",
         "//proto/prysm/v1alpha1/validator-client:go_default_library",
         "//validator/keymanager:go_default_library",
+        "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
         "@com_github_golang_protobuf//ptypes/empty",
         "@com_github_pkg_errors//:go_default_library",
     ],

validator/client/iface/validator_client.go

@@ -2,12 +2,66 @@ package iface
 
 import (
 	"context"
+	"encoding/json"
+	"strconv"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/pkg/errors"
 
 	"github.com/golang/protobuf/ptypes/empty"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 )
 
+type BeaconCommitteeSelection struct {
+	SelectionProof []byte
+	Slot           primitives.Slot
+	ValidatorIndex primitives.ValidatorIndex
+}
+
+type beaconCommitteeSelectionJson struct {
+	SelectionProof string `json:"selection_proof"`
+	Slot           string `json:"slot"`
+	ValidatorIndex string `json:"validator_index"`
+}
+
+func (b BeaconCommitteeSelection) MarshalJSON() ([]byte, error) {
+	return json.Marshal(beaconCommitteeSelectionJson{
+		SelectionProof: hexutil.Encode(b.SelectionProof),
+		Slot:           strconv.FormatUint(uint64(b.Slot), 10),
+		ValidatorIndex: strconv.FormatUint(uint64(b.ValidatorIndex), 10),
+	})
+}
+
+func (b *BeaconCommitteeSelection) UnmarshalJSON(input []byte) error {
+	var bjson beaconCommitteeSelectionJson
+	err := json.Unmarshal(input, &bjson)
+	if err != nil {
+		return errors.Wrap(err, "failed to unmarshal beacon committee selection")
+	}
+
+	slot, err := strconv.ParseUint(bjson.Slot, 10, 64)
+	if err != nil {
+		return errors.Wrap(err, "failed to parse slot")
+	}
+
+	vIdx, err := strconv.ParseUint(bjson.ValidatorIndex, 10, 64)
+	if err != nil {
+		return errors.Wrap(err, "failed to parse validator index")
+	}
+
+	selectionProof, err := hexutil.Decode(bjson.SelectionProof)
+	if err != nil {
+		return errors.Wrap(err, "failed to parse selection proof")
+	}
+
+	b.Slot = primitives.Slot(slot)
+	b.SelectionProof = selectionProof
+	b.ValidatorIndex = primitives.ValidatorIndex(vIdx)
+
+	return nil
+}
+
 type ValidatorClient interface {
 	GetDuties(ctx context.Context, in *ethpb.DutiesRequest) (*ethpb.DutiesResponse, error)
 	DomainData(ctx context.Context, in *ethpb.DomainRequest) (*ethpb.DomainResponse, error)
@@ -36,4 +90,5 @@ type ValidatorClient interface {
 	SubmitValidatorRegistrations(ctx context.Context, in *ethpb.SignedValidatorRegistrationsV1) (*empty.Empty, error)
 	StartEventStream(ctx context.Context) error
 	EventStreamIsRunning() bool
+	GetAggregatedSelections(ctx context.Context, selections []BeaconCommitteeSelection) ([]BeaconCommitteeSelection, error)
 }

validator/client/service.go

@@ -56,6 +56,7 @@ type ValidatorService struct {
 	useWeb                 bool
 	emitAccountMetrics     bool
 	logValidatorBalances   bool
+	distributed            bool
 	interopKeysConfig      *local.InteropKeymanagerConfig
 	conn                   validatorHelpers.NodeConnection
 	grpcRetryDelay         time.Duration
@@ -83,6 +84,7 @@ type Config struct {
 	UseWeb                     bool
 	LogValidatorBalances       bool
 	EmitAccountMetrics         bool
+	Distributed                bool
 	InteropKeysConfig          *local.InteropKeymanagerConfig
 	Wallet                     *wallet.Wallet
 	WalletInitializedFeed      *event.Feed
@@ -131,6 +133,7 @@ func NewValidatorService(ctx context.Context, cfg *Config) (*ValidatorService, e
 		Web3SignerConfig:       cfg.Web3SignerConfig,
 		proposerSettings:       cfg.ProposerSettings,
 		validatorsRegBatchSize: cfg.ValidatorsRegBatchSize,
+		distributed:            cfg.Distributed,
 	}
 
 	dialOpts := ConstructDialOptions(
@@ -230,6 +233,8 @@ func (v *ValidatorService) Start() {
 		proposerSettings:               v.proposerSettings,
 		walletInitializedChannel:       make(chan *wallet.Wallet, 1),
 		validatorsRegBatchSize:         v.validatorsRegBatchSize,
+		distributed:                    v.distributed,
+		attSelections:                  make(map[attSelectionKey]iface.BeaconCommitteeSelection),
 	}
 
 	v.validator = valStruct

validator/client/validator.go

@@ -67,12 +67,14 @@ type validator struct {
 	logValidatorBalances               bool
 	useWeb                             bool
 	emitAccountMetrics                 bool
+	distributed                        bool
 	domainDataLock                     sync.RWMutex
 	attLogsLock                        sync.Mutex
 	aggregatedSlotCommitteeIDCacheLock sync.Mutex
 	highestValidSlotLock               sync.Mutex
 	prevBalanceLock                    sync.RWMutex
 	slashableKeysLock                  sync.RWMutex
+	attSelectionLock                   sync.Mutex
 	eipImportBlacklistedPublicKeys     map[[fieldparams.BLSPubkeyLength]byte]bool
 	walletInitializedFeed              *event.Feed
 	attLogs                            map[[32]byte]*attSubmitted
@@ -82,6 +84,7 @@ type validator struct {
 	prevBalance                        map[[fieldparams.BLSPubkeyLength]byte]uint64
 	pubkeyToValidatorIndex             map[[fieldparams.BLSPubkeyLength]byte]primitives.ValidatorIndex
 	signedValidatorRegistrations       map[[fieldparams.BLSPubkeyLength]byte]*ethpb.SignedValidatorRegistrationV1
+	attSelections                      map[attSelectionKey]iface.BeaconCommitteeSelection
 	graffitiOrderedIndex               uint64
 	aggregatedSlotCommitteeIDCache     *lru.Cache
 	domainDataCache                    *ristretto.Cache
@@ -113,6 +116,11 @@ type validatorStatus struct {
 	index     primitives.ValidatorIndex
 }
 
+type attSelectionKey struct {
+	slot  primitives.Slot
+	index primitives.ValidatorIndex
+}
+
 // Done cleans up the validator.
 func (v *validator) Done() {
 	v.ticker.Done()
@@ -629,6 +637,13 @@ func (v *validator) subscribeToSubnets(ctx context.Context, res *ethpb.DutiesRes
 	subscribeValidatorIndices := make([]primitives.ValidatorIndex, 0, len(res.CurrentEpochDuties)+len(res.NextEpochDuties))
 	alreadySubscribed := make(map[[64]byte]bool)
 
+	if v.distributed {
+		// Get aggregated selection proofs to calculate isAggregator.
+		if err := v.getAggregatedSelectionProofs(ctx, res); err != nil {
+			return errors.Wrap(err, "could not get aggregated selection proofs")
+		}
+	}
+
 	for _, duty := range res.CurrentEpochDuties {
 		pk := bytesutil.ToBytes48(duty.PublicKey)
 		if duty.Status == ethpb.ValidatorStatus_ACTIVE || duty.Status == ethpb.ValidatorStatus_EXITING {
@@ -641,7 +656,7 @@ func (v *validator) subscribeToSubnets(ctx context.Context, res *ethpb.DutiesRes
 				continue
 			}
 
-			aggregator, err := v.isAggregator(ctx, duty.Committee, attesterSlot, pk)
+			aggregator, err := v.isAggregator(ctx, duty.Committee, attesterSlot, pk, validatorIndex)
 			if err != nil {
 				return errors.Wrap(err, "could not check if a validator is an aggregator")
 			}
@@ -667,7 +682,7 @@ func (v *validator) subscribeToSubnets(ctx context.Context, res *ethpb.DutiesRes
 				continue
 			}
 
-			aggregator, err := v.isAggregator(ctx, duty.Committee, attesterSlot, bytesutil.ToBytes48(duty.PublicKey))
+			aggregator, err := v.isAggregator(ctx, duty.Committee, attesterSlot, bytesutil.ToBytes48(duty.PublicKey), validatorIndex)
 			if err != nil {
 				return errors.Wrap(err, "could not check if a validator is an aggregator")
 			}
@@ -718,7 +733,7 @@ func (v *validator) RolesAt(ctx context.Context, slot primitives.Slot) (map[[fie
 		if duty.AttesterSlot == slot {
 			roles = append(roles, iface.RoleAttester)
 
-			aggregator, err := v.isAggregator(ctx, duty.Committee, slot, bytesutil.ToBytes48(duty.PublicKey))
+			aggregator, err := v.isAggregator(ctx, duty.Committee, slot, bytesutil.ToBytes48(duty.PublicKey), duty.ValidatorIndex)
 			if err != nil {
 				return nil, errors.Wrap(err, "could not check if a validator is an aggregator")
 			}
@@ -773,15 +788,26 @@ func (v *validator) Keymanager() (keymanager.IKeymanager, error) {
 
 // isAggregator checks if a validator is an aggregator of a given slot and committee,
 // it uses a modulo calculated by validator count in committee and samples randomness around it.
-func (v *validator) isAggregator(ctx context.Context, committee []primitives.ValidatorIndex, slot primitives.Slot, pubKey [fieldparams.BLSPubkeyLength]byte) (bool, error) {
+func (v *validator) isAggregator(ctx context.Context, committee []primitives.ValidatorIndex, slot primitives.Slot, pubKey [fieldparams.BLSPubkeyLength]byte, validatorIndex primitives.ValidatorIndex) (bool, error) {
 	modulo := uint64(1)
 	if len(committee)/int(params.BeaconConfig().TargetAggregatorsPerCommittee) > 1 {
 		modulo = uint64(len(committee)) / params.BeaconConfig().TargetAggregatorsPerCommittee
 	}
 
-	slotSig, err := v.signSlotWithSelectionProof(ctx, pubKey, slot)
+	var (
-	if err != nil {
+		slotSig []byte
-		return false, err
+		err     error
+	)
+	if v.distributed {
+		slotSig, err = v.getAttSelection(attSelectionKey{slot: slot, index: validatorIndex})
+		if err != nil {
+			return false, err
+		}
+	} else {
+		slotSig, err = v.signSlotWithSelectionProof(ctx, pubKey, slot)
+		if err != nil {
+			return false, err
+		}
 	}
 
 	b := hash.Hash(slotSig)
@@ -1230,6 +1256,89 @@ func (v *validator) validatorIndex(ctx context.Context, pubkey [fieldparams.BLSP
 	return resp.Index, true, nil
 }
 
+func (v *validator) getAggregatedSelectionProofs(ctx context.Context, duties *ethpb.DutiesResponse) error {
+	// Create new instance of attestation selections map.
+	v.newAttSelections()
+
+	var req []iface.BeaconCommitteeSelection
+	for _, duty := range duties.CurrentEpochDuties {
+		if duty.Status != ethpb.ValidatorStatus_ACTIVE && duty.Status != ethpb.ValidatorStatus_EXITING {
+			continue
+		}
+
+		pk := bytesutil.ToBytes48(duty.PublicKey)
+		slotSig, err := v.signSlotWithSelectionProof(ctx, pk, duty.AttesterSlot)
+		if err != nil {
+			return err
+		}
+
+		req = append(req, iface.BeaconCommitteeSelection{
+			SelectionProof: slotSig,
+			Slot:           duty.AttesterSlot,
+			ValidatorIndex: duty.ValidatorIndex,
+		})
+	}
+
+	for _, duty := range duties.NextEpochDuties {
+		if duty.Status != ethpb.ValidatorStatus_ACTIVE && duty.Status != ethpb.ValidatorStatus_EXITING {
+			continue
+		}
+
+		pk := bytesutil.ToBytes48(duty.PublicKey)
+		slotSig, err := v.signSlotWithSelectionProof(ctx, pk, duty.AttesterSlot)
+		if err != nil {
+			return err
+		}
+
+		req = append(req, iface.BeaconCommitteeSelection{
+			SelectionProof: slotSig,
+			Slot:           duty.AttesterSlot,
+			ValidatorIndex: duty.ValidatorIndex,
+		})
+	}
+
+	resp, err := v.validatorClient.GetAggregatedSelections(ctx, req)
+	if err != nil {
+		return err
+	}
+
+	// Store aggregated selection proofs in state.
+	v.addAttSelections(resp)
+
+	return nil
+}
+
+func (v *validator) addAttSelections(selections []iface.BeaconCommitteeSelection) {
+	v.attSelectionLock.Lock()
+	defer v.attSelectionLock.Unlock()
+
+	for _, s := range selections {
+		v.attSelections[attSelectionKey{
+			slot:  s.Slot,
+			index: s.ValidatorIndex,
+		}] = s
+	}
+}
+
+func (v *validator) newAttSelections() {
+	v.attSelectionLock.Lock()
+	defer v.attSelectionLock.Unlock()
+
+	v.attSelections = make(map[attSelectionKey]iface.BeaconCommitteeSelection)
+}
+
+func (v *validator) getAttSelection(key attSelectionKey) ([]byte, error) {
+	v.attSelectionLock.Lock()
+	defer v.attSelectionLock.Unlock()
+
+	s, ok := v.attSelections[key]
+	if !ok {
+		return nil, errors.Errorf("selection proof not found for the given slot=%d and validator_index=%d", key.slot, key.index)
+	}
+
+	return s.SelectionProof, nil
+}
+
 // This constructs a validator subscribed key, it's used to track
 // which subnet has already been pending requested.
 func validatorSubscribeKey(slot primitives.Slot, committeeID primitives.CommitteeIndex) [64]byte {

validator/client/validator_test.go

@@ -639,6 +639,92 @@ func TestUpdateDuties_AllValidatorsExited(t *testing.T) {
 
 }
 
+func TestUpdateDuties_Distributed(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+	client := validatormock.NewMockValidatorClient(ctrl)
+
+	// Start of third epoch.
+	slot := 2 * params.BeaconConfig().SlotsPerEpoch
+	keys := randKeypair(t)
+	resp := &ethpb.DutiesResponse{
+		CurrentEpochDuties: []*ethpb.DutiesResponse_Duty{
+			{
+				AttesterSlot:   slot, // First slot in epoch.
+				ValidatorIndex: 200,
+				CommitteeIndex: 100,
+				PublicKey:      keys.pub[:],
+				Status:         ethpb.ValidatorStatus_ACTIVE,
+			},
+		},
+		NextEpochDuties: []*ethpb.DutiesResponse_Duty{
+			{
+				AttesterSlot:   slot + params.BeaconConfig().SlotsPerEpoch, // First slot in next epoch.
+				ValidatorIndex: 200,
+				CommitteeIndex: 100,
+				PublicKey:      keys.pub[:],
+				Status:         ethpb.ValidatorStatus_ACTIVE,
+			},
+		},
+	}
+
+	v := validator{
+		keyManager:      newMockKeymanager(t, keys),
+		validatorClient: client,
+		distributed:     true,
+	}
+
+	sigDomain := make([]byte, 32)
+
+	client.EXPECT().GetDuties(
+		gomock.Any(),
+		gomock.Any(),
+	).Return(resp, nil)
+
+	client.EXPECT().DomainData(
+		gomock.Any(), // ctx
+		gomock.Any(), // epoch
+	).Return(
+		&ethpb.DomainResponse{SignatureDomain: sigDomain},
+		nil, /*err*/
+	).Times(2)
+
+	client.EXPECT().GetAggregatedSelections(
+		gomock.Any(),
+		gomock.Any(), // fill this properly
+	).Return(
+		[]iface.BeaconCommitteeSelection{
+			{
+				SelectionProof: make([]byte, 32),
+				Slot:           slot,
+				ValidatorIndex: 200,
+			},
+			{
+				SelectionProof: make([]byte, 32),
+				Slot:           slot + params.BeaconConfig().SlotsPerEpoch,
+				ValidatorIndex: 200,
+			},
+		},
+		nil,
+	)
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+
+	client.EXPECT().SubscribeCommitteeSubnets(
+		gomock.Any(),
+		gomock.Any(),
+		gomock.Any(),
+	).DoAndReturn(func(_ context.Context, _ *ethpb.CommitteeSubnetsSubscribeRequest, _ []primitives.ValidatorIndex) (*emptypb.Empty, error) {
+		wg.Done()
+		return nil, nil
+	})
+
+	require.NoError(t, v.UpdateDuties(context.Background(), slot), "Could not update assignments")
+	util.WaitTimeout(&wg, 2*time.Second)
+	require.Equal(t, 2, len(v.attSelections))
+}
+
 func TestRolesAt_OK(t *testing.T) {
 	v, m, validatorKey, finish := setup(t)
 	defer finish()
@@ -2173,7 +2259,7 @@ func TestValidator_buildSignedRegReqs_DefaultConfigDisabled(t *testing.T) {
 	ctx := context.Background()
 	client := validatormock.NewMockValidatorClient(ctrl)
 
-	signature := blsmock.NewSignature(ctrl)
+	signature := blsmock.NewMockSignature(ctrl)
 	signature.EXPECT().Marshal().Return([]byte{})
 
 	v := validator{
@@ -2258,7 +2344,7 @@ func TestValidator_buildSignedRegReqs_DefaultConfigEnabled(t *testing.T) {
 	ctx := context.Background()
 	client := validatormock.NewMockValidatorClient(ctrl)
 
-	signature := blsmock.NewSignature(ctrl)
+	signature := blsmock.NewMockSignature(ctrl)
 	signature.EXPECT().Marshal().Return([]byte{}).Times(2)
 
 	v := validator{
@@ -2380,7 +2466,7 @@ func TestValidator_buildSignedRegReqs_TimestampBeforeGenesis(t *testing.T) {
 	ctx := context.Background()
 	client := validatormock.NewMockValidatorClient(ctrl)
 
-	signature := blsmock.NewSignature(ctrl)
+	signature := blsmock.NewMockSignature(ctrl)
 
 	v := validator{
 		signedValidatorRegistrations: map[[48]byte]*ethpb.SignedValidatorRegistrationV1{},

validator/node/node.go

@@ -497,6 +497,7 @@ func (c *ValidatorClient) registerValidatorService(cliCtx *cli.Context) error {
 		BeaconApiTimeout:           time.Second * 30,
 		BeaconApiEndpoint:          c.cliCtx.String(flags.BeaconRESTApiProviderFlag.Name),
 		ValidatorsRegBatchSize:     c.cliCtx.Int(flags.ValidatorsRegistrationBatchSizeFlag.Name),
+		Distributed:                c.cliCtx.Bool(flags.EnableDistributed.Name),
 	})
 	if err != nil {
 		return errors.Wrap(err, "could not initialize validator service")