v1.4.18-patch-2

nekryptology/pkg/vdf/wesolowski.go

@@ -89,7 +89,10 @@ func GenerateVDFWithStopChan(seed []byte, iterations, int_size_bits uint32, stop
 func GenerateVDFIteration(seed, x_blob []byte, iterations, int_size_bits uint32) ([]byte, []byte) {
 	int_size := (int_size_bits + 16) >> 4
 	D := iqc.CreateDiscriminant(seed, int_size_bits)
-	x, _ := iqc.NewClassGroupFromBytesDiscriminant(x_blob[:(2*int_size)], D)
+	x, ok := iqc.NewClassGroupFromBytesDiscriminant(x_blob[:(2*int_size)], D)
+	if !ok {
+		return nil, nil
+	}
 
 	y, proof := calculateVDF(D, x, iterations, int_size_bits, nil)
 
@@ -105,8 +108,15 @@ func VerifyVDF(seed, proof_blob []byte, iterations, int_size_bits uint32) bool {
 
 	D := iqc.CreateDiscriminant(seed, int_size_bits)
 	x := iqc.NewClassGroupFromAbDiscriminant(big.NewInt(2), big.NewInt(1), D)
-	y, _ := iqc.NewClassGroupFromBytesDiscriminant(proof_blob[:(2*int_size)], D)
-	proof, _ := iqc.NewClassGroupFromBytesDiscriminant(proof_blob[2*int_size:], D)
+	y, ok := iqc.NewClassGroupFromBytesDiscriminant(proof_blob[:(2*int_size)], D)
+	if !ok {
+		return false
+	}
+
+	proof, ok := iqc.NewClassGroupFromBytesDiscriminant(proof_blob[2*int_size:], D)
+	if !ok {
+		return false
+	}
 
 	return verifyProof(x, y, proof, iterations)
 }
@@ -114,9 +124,20 @@ func VerifyVDF(seed, proof_blob []byte, iterations, int_size_bits uint32) bool {
 func VerifyVDFIteration(seed, x_blob, proof_blob []byte, iterations, int_size_bits uint32) bool {
 	int_size := (int_size_bits + 16) >> 4
 	D := iqc.CreateDiscriminant(seed, int_size_bits)
-	x, _ := iqc.NewClassGroupFromBytesDiscriminant(x_blob[:(2*int_size)], D)
-	y, _ := iqc.NewClassGroupFromBytesDiscriminant(proof_blob[:(2*int_size)], D)
-	proof, _ := iqc.NewClassGroupFromBytesDiscriminant(proof_blob[2*int_size:], D)
+	x, ok := iqc.NewClassGroupFromBytesDiscriminant(x_blob[:(2*int_size)], D)
+	if !ok {
+		return false
+	}
+
+	y, ok := iqc.NewClassGroupFromBytesDiscriminant(proof_blob[:(2*int_size)], D)
+	if !ok {
+		return false
+	}
+
+	proof, ok := iqc.NewClassGroupFromBytesDiscriminant(proof_blob[2*int_size:], D)
+	if !ok {
+		return false
+	}
 
 	return verifyProof(x, y, proof, iterations)
 }

node/config/engine.go

@@ -8,6 +8,14 @@ type EngineConfig struct {
 	PendingCommitWorkers int64  `yaml:"pendingCommitWorkers"`
 	MinimumPeersRequired int    `yaml:"minimumPeersRequired"`
 	StatsMultiaddr       string `yaml:"statsMultiaddr"`
+	// Sets the fmt.Sprintf format string to use as the listen multiaddrs for
+	// data worker processes
+	DataWorkerBaseListenMultiaddr string `yaml:"dataWorkerBaseListenMultiaddr"`
+	// Sets the starting port number to use as the listen port for data worker
+	// processes, incrementing by 1 until n-1, n = cores. (Example: a 4 core
+	// system, base listen port of 40000 will listen on 40000, 40001, 40002)
+	DataWorkerBaseListenPort uint16 `yaml:"dataWorkerBaseListenPort"`
+	DataWorkerMemoryLimit    int64  `yaml:"dataWorkerMemoryLimit"`
 
 	// Values used only for testing – do not override these in production, your
 	// node will get kicked out

node/config/version.go

@@ -29,5 +29,5 @@ func FormatVersion(version []byte) string {
 }
 
 func GetPatchNumber() byte {
-	return 0x01
+	return 0x02
 }

node/consensus/master/broadcast_messaging.go

@@ -116,15 +116,19 @@ func (e *MasterClockConsensusEngine) handleSelfTestReport(
 	peerID []byte,
 	any *anypb.Any,
 ) error {
-	if bytes.Equal(peerID, e.pubSub.GetPeerID()) {
-		return nil
-	}
-
 	report := &protobufs.SelfTestReport{}
 	if err := any.UnmarshalTo(report); err != nil {
 		return errors.Wrap(err, "handle self test report")
 	}
 
+	if bytes.Equal(peerID, e.pubSub.GetPeerID()) {
+		info := e.peerInfoManager.GetPeerInfo(peerID)
+		info.LastSeen = time.Now().UnixMilli()
+		info.DifficultyMetric = report.DifficultyMetric
+		info.MasterHeadFrame = report.MasterHeadFrame
+		return nil
+	}
+
 	// minimum proof size is one timestamp, one vdf proof, must match one fewer
 	// than core count
 	if len(report.Proof) < 516+8 ||

node/consensus/master/master_clock_consensus_engine.go

@@ -7,6 +7,7 @@ import (
 	"crypto/rand"
 	"encoding/binary"
 	"encoding/hex"
+	"fmt"
 	"io"
 	"math/big"
 	"sync"
@@ -15,9 +16,12 @@ import (
 	"github.com/iden3/go-iden3-crypto/poseidon"
 	"github.com/libp2p/go-libp2p/core/peer"
 	"github.com/mr-tron/base58"
+	"github.com/multiformats/go-multiaddr"
+	mn "github.com/multiformats/go-multiaddr/net"
 	"github.com/pkg/errors"
 	"go.uber.org/zap"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 	"source.quilibrium.com/quilibrium/monorepo/node/config"
 	"source.quilibrium.com/quilibrium/monorepo/node/consensus"
 	qtime "source.quilibrium.com/quilibrium/monorepo/node/consensus/time"
@@ -68,6 +72,7 @@ type MasterClockConsensusEngine struct {
 	verifyTestCh                chan verifyChallenge
 	currentReceivingSyncPeers   int
 	currentReceivingSyncPeersMx sync.Mutex
+	engineConfig                *config.EngineConfig
 }
 
 var _ consensus.ConsensusEngine = (*MasterClockConsensusEngine)(nil)
@@ -131,6 +136,7 @@ func NewMasterClockConsensusEngine(
 		frameValidationCh:   make(chan *protobufs.ClockFrame),
 		bandwidthTestCh:     make(chan []byte),
 		verifyTestCh:        make(chan verifyChallenge),
+		engineConfig:        engineConfig,
 	}
 
 	e.addPeerManifestReport(e.pubSub.GetPeerID(), report)
@@ -241,6 +247,16 @@ func (e *MasterClockConsensusEngine) Start() <-chan error {
 		time.Sleep(30 * time.Second)
 		difficultyMetric := int64(100000)
 		skew := (difficultyMetric * 12) / 10
+		parallelism := e.report.Cores - 1
+
+		if parallelism < 3 {
+			panic("invalid system configuration, minimum system configuration must be four cores")
+		}
+
+		clients, err := e.createParallelDataClients(int(parallelism))
+		if err != nil {
+			panic(err)
+		}
 
 		for {
 			head, err := e.masterTimeReel.Head()
@@ -250,7 +266,6 @@ func (e *MasterClockConsensusEngine) Start() <-chan error {
 
 			e.report.MasterHeadFrame = head.FrameNumber
 			e.report.DifficultyMetric = difficultyMetric
-			parallelism := e.report.Cores - 1
 
 			challenge := binary.BigEndian.AppendUint64(
 				[]byte{},
@@ -258,15 +273,42 @@ func (e *MasterClockConsensusEngine) Start() <-chan error {
 			)
 			challenge = append(challenge, e.pubSub.GetPeerID()...)
 
-			ts, proofs, nextDifficultyMetric, err :=
-				e.frameProver.CalculateChallengeProof(
-					challenge,
-					parallelism,
-					skew,
-				)
-			if err != nil {
-				panic(err)
+			proofs := make([][]byte, parallelism)
+			nextMetrics := make([]int64, parallelism)
+
+			wg := sync.WaitGroup{}
+			wg.Add(int(parallelism))
+
+			ts := time.Now().UnixMilli()
+			for i := uint32(0); i < parallelism; i++ {
+				i := i
+				go func() {
+					resp, err :=
+						clients[i].CalculateChallengeProof(
+							context.Background(),
+							&protobufs.ChallengeProofRequest{
+								Challenge: challenge,
+								Core:      i,
+								Skew:      skew,
+								NowMs:     ts,
+							},
+						)
+					if err != nil {
+						panic(err)
+					}
+
+					proofs[i], nextMetrics[i] = resp.Output, resp.NextSkew
+					wg.Done()
+				}()
 			}
+			wg.Wait()
+			nextDifficultySum := uint64(0)
+			for i := 0; i < int(parallelism); i++ {
+				nextDifficultySum += uint64(nextMetrics[i])
+			}
+
+			nextDifficultyMetric := int64(nextDifficultySum / uint64(parallelism))
+
 			e.logger.Info(
 				"recalibrating difficulty metric",
 				zap.Int64("previous_difficulty_metric", difficultyMetric),
@@ -336,6 +378,64 @@ func (e *MasterClockConsensusEngine) Start() <-chan error {
 	return errChan
 }
 
+func (e *MasterClockConsensusEngine) createParallelDataClients(
+	paralellism int,
+) ([]protobufs.DataIPCServiceClient, error) {
+	e.logger.Info(
+		"connecting to data worker processes",
+		zap.Int("parallelism", paralellism),
+	)
+
+	if e.engineConfig.DataWorkerBaseListenMultiaddr == "" {
+		e.engineConfig.DataWorkerBaseListenMultiaddr = "/ip4/127.0.0.1/tcp/%d"
+	}
+
+	if e.engineConfig.DataWorkerBaseListenPort == 0 {
+		e.engineConfig.DataWorkerBaseListenPort = 40000
+	}
+
+	clients := make([]protobufs.DataIPCServiceClient, paralellism)
+
+	for i := 0; i < paralellism; i++ {
+		ma, err := multiaddr.NewMultiaddr(
+			fmt.Sprintf(
+				e.engineConfig.DataWorkerBaseListenMultiaddr,
+				int(e.engineConfig.DataWorkerBaseListenPort)+i,
+			),
+		)
+		if err != nil {
+			panic(err)
+		}
+
+		_, addr, err := mn.DialArgs(ma)
+		if err != nil {
+			panic(err)
+		}
+
+		conn, err := grpc.Dial(
+			addr,
+			grpc.WithTransportCredentials(
+				insecure.NewCredentials(),
+			),
+			grpc.WithDefaultCallOptions(
+				grpc.MaxCallSendMsgSize(10*1024*1024),
+				grpc.MaxCallRecvMsgSize(10*1024*1024),
+			),
+		)
+		if err != nil {
+			panic(err)
+		}
+
+		clients[i] = protobufs.NewDataIPCServiceClient(conn)
+	}
+
+	e.logger.Info(
+		"connected to data worker processes",
+		zap.Int("parallelism", paralellism),
+	)
+	return clients, nil
+}
+
 func (e *MasterClockConsensusEngine) PerformValidation(
 	ctx context.Context,
 	msg *protobufs.ValidationMessage,

node/crypto/frame_prover.go

@@ -53,9 +53,10 @@ type FrameProver interface {
 	) bool
 	CalculateChallengeProof(
 		challenge []byte,
-		parallelism uint32,
+		core uint32,
 		skew int64,
-	) (int64, [][]byte, int64, error)
+		nowMs int64,
+	) ([]byte, int64, error)
 	VerifyChallengeProof(
 		challenge []byte,
 		timestamp int64,

node/crypto/wesolowski_frame_prover.go

@@ -6,7 +6,6 @@ import (
 	"crypto/rand"
 	"encoding/binary"
 	"math/big"
-	"sync"
 	"time"
 
 	"github.com/cloudflare/circl/sign/ed448"
@@ -601,43 +600,31 @@ func (w *WesolowskiFrameProver) VerifyWeakRecursiveProof(
 
 func (w *WesolowskiFrameProver) CalculateChallengeProof(
 	challenge []byte,
-	parallelism uint32,
+	core uint32,
 	skew int64,
-) (int64, [][]byte, int64, error) {
-	now := time.Now()
-	nowMs := now.UnixMilli()
+	nowMs int64,
+) ([]byte, int64, error) {
 	input := binary.BigEndian.AppendUint64([]byte{}, uint64(nowMs))
 	input = append(input, challenge...)
-	outputs := make([][]byte, parallelism)
-
-	wg := sync.WaitGroup{}
-	wg.Add(int(parallelism))
 
 	// 4.5 minutes = 270 seconds, one increment should be ten seconds
 	proofDuration := 270 * 1000
 	calibratedDifficulty := (int64(proofDuration) * 10000) / skew
-	for i := uint32(0); i < parallelism; i++ {
-		i := i
-		go func() {
-			instanceInput := binary.BigEndian.AppendUint32([]byte{}, i)
-			instanceInput = append(instanceInput, input...)
-			b := sha3.Sum256(instanceInput)
-			v := vdf.New(uint32(calibratedDifficulty), b)
+	instanceInput := binary.BigEndian.AppendUint32([]byte{}, core)
+	instanceInput = append(instanceInput, input...)
+	b := sha3.Sum256(instanceInput)
+	v := vdf.New(uint32(calibratedDifficulty), b)
 
-			v.Execute()
-			o := v.GetOutput()
+	v.Execute()
+	o := v.GetOutput()
 
-			outputs[i] = make([]byte, 516)
-			copy(outputs[i][:], o[:])
-			wg.Done()
-		}()
-	}
-
-	wg.Wait()
+	output := make([]byte, 516)
+	copy(output[:], o[:])
+	now := time.UnixMilli(nowMs)
 	after := time.Since(now)
 	nextSkew := (skew * after.Milliseconds()) / int64(proofDuration)
 
-	return nowMs, outputs, nextSkew, nil
+	return output, nextSkew, nil
 }
 
 func (w *WesolowskiFrameProver) VerifyChallengeProof(

node/crypto/wesolowski_frame_prover_test.go

@@ -30,10 +30,12 @@ func TestMasterProve(t *testing.T) {
 func TestChallengeProof(t *testing.T) {
 	l, _ := zap.NewProduction()
 	w := crypto.NewWesolowskiFrameProver(l)
-	now, proofs, nextSkew, err := w.CalculateChallengeProof([]byte{0x01, 0x02, 0x03}, 3, 120000)
+	now := time.Now().UnixMilli()
+	proofs, nextSkew, err := w.CalculateChallengeProof([]byte{0x01, 0x02, 0x03}, 0, 120000, now)
 	assert.NoError(t, err)
-	assert.True(t, w.VerifyChallengeProof([]byte{0x01, 0x02, 0x03}, now, 100000, proofs))
-	now, proofs, _, err = w.CalculateChallengeProof([]byte{0x01, 0x02, 0x03}, 3, nextSkew*12/10)
+	assert.True(t, w.VerifyChallengeProof([]byte{0x01, 0x02, 0x03}, now, 100000, [][]byte{proofs}))
+	now = time.Now().UnixMilli()
+	proofs, _, err = w.CalculateChallengeProof([]byte{0x01, 0x02, 0x03}, 0, nextSkew*12/10, now)
 	assert.NoError(t, err)
-	assert.True(t, w.VerifyChallengeProof([]byte{0x01, 0x02, 0x03}, now, nextSkew, proofs))
+	assert.True(t, w.VerifyChallengeProof([]byte{0x01, 0x02, 0x03}, now, nextSkew, [][]byte{proofs}))
 }

node/main.go

@@ -12,9 +12,11 @@ import (
 	"io/fs"
 	"log"
 	"os"
+	"os/exec"
 	"os/signal"
 	"path/filepath"
 	"runtime"
+	rdebug "runtime/debug"
 	"runtime/pprof"
 	"strconv"
 	"strings"
@@ -103,6 +105,16 @@ var (
 		true,
 		"enables or disables signature validation (default true)",
 	)
+	core = flag.Int(
+		"core",
+		0,
+		"specifies the core of the process (defaults to zero, the initial launcher)",
+	)
+	parentProcess = flag.Int(
+		"parent-process",
+		0,
+		"specifies the parent process pid for a data worker",
+	)
 )
 
 var signatories = []string{
@@ -264,7 +276,7 @@ func main() {
 	done := make(chan os.Signal, 1)
 	signal.Notify(done, syscall.SIGINT, syscall.SIGTERM)
 
-	if !*dbConsole {
+	if !*dbConsole && *core == 0 {
 		printLogo()
 		printVersion()
 		fmt.Println(" ")
@@ -322,7 +334,58 @@ func main() {
 		return
 	}
 
+	if *core != 0 {
+		runtime.GOMAXPROCS(1)
+		rdebug.SetGCPercent(9999)
+
+		if nodeConfig.Engine.DataWorkerMemoryLimit == 0 {
+			nodeConfig.Engine.DataWorkerMemoryLimit = 1792 * 1024 * 1024 // 1.75GiB
+		}
+
+		rdebug.SetMemoryLimit(nodeConfig.Engine.DataWorkerMemoryLimit)
+
+		if nodeConfig.Engine.DataWorkerBaseListenMultiaddr == "" {
+			nodeConfig.Engine.DataWorkerBaseListenMultiaddr = "/ip4/127.0.0.1/tcp/%d"
+		}
+
+		if nodeConfig.Engine.DataWorkerBaseListenPort == 0 {
+			nodeConfig.Engine.DataWorkerBaseListenPort = 40000
+		}
+
+		if *parentProcess == 0 {
+			panic("parent process pid not specified")
+		}
+
+		l, err := zap.NewProduction()
+		if err != nil {
+			panic(err)
+		}
+
+		rpcMultiaddr := fmt.Sprintf(
+			nodeConfig.Engine.DataWorkerBaseListenMultiaddr,
+			int(nodeConfig.Engine.DataWorkerBaseListenPort)+*core-1,
+		)
+		srv, err := rpc.NewDataWorkerIPCServer(
+			rpcMultiaddr,
+			l,
+			uint32(*core)-1,
+			qcrypto.NewWesolowskiFrameProver(l),
+			*parentProcess,
+		)
+		if err != nil {
+			panic(err)
+		}
+
+		err = srv.Start()
+		if err != nil {
+			panic(err)
+		}
+		return
+	}
+
 	fmt.Println("Loading ceremony state and starting node...")
+	go spawnDataWorkers()
+
 	kzg.Init()
 
 	report := RunSelfTestIfNeeded(*configDirectory, nodeConfig)
@@ -365,9 +428,55 @@ func main() {
 	node.Start()
 
 	<-done
+	stopDataWorkers()
 	node.Stop()
 }
 
+var dataWorkers []*exec.Cmd
+
+func spawnDataWorkers() {
+	process, err := os.Executable()
+	if err != nil {
+		panic(err)
+	}
+
+	cores := runtime.GOMAXPROCS(0)
+	dataWorkers = make([]*exec.Cmd, cores-1)
+	fmt.Printf("Spawning %d data workers...\n", cores-1)
+
+	for i := 1; i <= cores-1; i++ {
+		i := i
+		go func() {
+			args := []string{
+				fmt.Sprintf("--core=%d", i),
+				fmt.Sprintf("--parent-process=%d", os.Getpid()),
+			}
+			args = append(args, os.Args[1:]...)
+			cmd := exec.Command(process, args...)
+			cmd.Stdout = os.Stdout
+			cmd.Stderr = os.Stderr
+			err := cmd.Start()
+			if err != nil {
+				panic(err)
+			}
+
+			dataWorkers[i-1] = cmd
+		}()
+	}
+}
+
+func stopDataWorkers() {
+	for i := 0; i < len(dataWorkers); i++ {
+		err := dataWorkers[i].Process.Signal(os.Kill)
+		if err != nil {
+			fmt.Printf(
+				"fatal: unable to kill worker with pid %d, please kill this process!\n",
+				dataWorkers[i].Process.Pid,
+			)
+		}
+	}
+}
+
 // Reintroduce at a later date
 func RunCompaction(clockStore *store.PebbleClockStore) {
 	intrinsicFilter := append(

node/node-1.4.18-darwin-arm64.dgst

@@ -0,0 +1 @@
+SHA3-256(node-1.4.18-darwin-arm64)= 0f666d6c3814f96bebce455034fe6a44b64f223b4e313ac506f42fa2371ac30d

node/node-1.4.18-linux-amd64.dgst

@@ -0,0 +1 @@
+SHA3-256(node-1.4.18-linux-amd64)= f2da38a5c8d4257767f4a9659ca9c05d4cf312fd7294e6a18847c8923f6815a0

node/node-1.4.18-linux-arm64.dgst

@@ -0,0 +1 @@
+SHA3-256(node-1.4.18-linux-arm64)= e12e14a18a491921fcdd4ffe6e9792f1e195abf4950fe56316219f920867c45a

node/protobufs/data.pb.go

@@ -0,0 +1,258 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.30.0
+// 	protoc        v3.21.12
+// source: data.proto
+
+package protobufs
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type ChallengeProofRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Challenge []byte `protobuf:"bytes,1,opt,name=challenge,proto3" json:"challenge,omitempty"`
+	Core      uint32 `protobuf:"varint,2,opt,name=core,proto3" json:"core,omitempty"`
+	Skew      int64  `protobuf:"varint,3,opt,name=skew,proto3" json:"skew,omitempty"`
+	NowMs     int64  `protobuf:"varint,4,opt,name=now_ms,json=nowMs,proto3" json:"now_ms,omitempty"`
+}
+
+func (x *ChallengeProofRequest) Reset() {
+	*x = ChallengeProofRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_data_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ChallengeProofRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ChallengeProofRequest) ProtoMessage() {}
+
+func (x *ChallengeProofRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_data_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ChallengeProofRequest.ProtoReflect.Descriptor instead.
+func (*ChallengeProofRequest) Descriptor() ([]byte, []int) {
+	return file_data_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *ChallengeProofRequest) GetChallenge() []byte {
+	if x != nil {
+		return x.Challenge
+	}
+	return nil
+}
+
+func (x *ChallengeProofRequest) GetCore() uint32 {
+	if x != nil {
+		return x.Core
+	}
+	return 0
+}
+
+func (x *ChallengeProofRequest) GetSkew() int64 {
+	if x != nil {
+		return x.Skew
+	}
+	return 0
+}
+
+func (x *ChallengeProofRequest) GetNowMs() int64 {
+	if x != nil {
+		return x.NowMs
+	}
+	return 0
+}
+
+type ChallengeProofResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Output   []byte `protobuf:"bytes,1,opt,name=output,proto3" json:"output,omitempty"`
+	NextSkew int64  `protobuf:"varint,2,opt,name=next_skew,json=nextSkew,proto3" json:"next_skew,omitempty"`
+}
+
+func (x *ChallengeProofResponse) Reset() {
+	*x = ChallengeProofResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_data_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ChallengeProofResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ChallengeProofResponse) ProtoMessage() {}
+
+func (x *ChallengeProofResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_data_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ChallengeProofResponse.ProtoReflect.Descriptor instead.
+func (*ChallengeProofResponse) Descriptor() ([]byte, []int) {
+	return file_data_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *ChallengeProofResponse) GetOutput() []byte {
+	if x != nil {
+		return x.Output
+	}
+	return nil
+}
+
+func (x *ChallengeProofResponse) GetNextSkew() int64 {
+	if x != nil {
+		return x.NextSkew
+	}
+	return 0
+}
+
+var File_data_proto protoreflect.FileDescriptor
+
+var file_data_proto_rawDesc = []byte{
+	0x0a, 0x0a, 0x64, 0x61, 0x74, 0x61, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x17, 0x71, 0x75,
+	0x69, 0x6c, 0x69, 0x62, 0x72, 0x69, 0x75, 0x6d, 0x2e, 0x6e, 0x6f, 0x64, 0x65, 0x2e, 0x64, 0x61,
+	0x74, 0x61, 0x2e, 0x70, 0x62, 0x22, 0x74, 0x0a, 0x15, 0x43, 0x68, 0x61, 0x6c, 0x6c, 0x65, 0x6e,
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+	0x68, 0x61, 0x6c, 0x6c, 0x65, 0x6e, 0x67, 0x65, 0x50, 0x72, 0x6f, 0x6f, 0x66, 0x52, 0x65, 0x73,
+	0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x16, 0x0a, 0x06, 0x6f, 0x75, 0x74, 0x70, 0x75, 0x74, 0x18,
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+	0x09, 0x6e, 0x65, 0x78, 0x74, 0x5f, 0x73, 0x6b, 0x65, 0x77, 0x18, 0x02, 0x20, 0x01, 0x28, 0x03,
+	0x52, 0x08, 0x6e, 0x65, 0x78, 0x74, 0x53, 0x6b, 0x65, 0x77, 0x32, 0x8c, 0x01, 0x0a, 0x0e, 0x44,
+	0x61, 0x74, 0x61, 0x49, 0x50, 0x43, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x12, 0x7a, 0x0a,
+	0x17, 0x43, 0x61, 0x6c, 0x63, 0x75, 0x6c, 0x61, 0x74, 0x65, 0x43, 0x68, 0x61, 0x6c, 0x6c, 0x65,
+	0x6e, 0x67, 0x65, 0x50, 0x72, 0x6f, 0x6f, 0x66, 0x12, 0x2e, 0x2e, 0x71, 0x75, 0x69, 0x6c, 0x69,
+	0x62, 0x72, 0x69, 0x75, 0x6d, 0x2e, 0x6e, 0x6f, 0x64, 0x65, 0x2e, 0x64, 0x61, 0x74, 0x61, 0x2e,
+	0x70, 0x62, 0x2e, 0x43, 0x68, 0x61, 0x6c, 0x6c, 0x65, 0x6e, 0x67, 0x65, 0x50, 0x72, 0x6f, 0x6f,
+	0x66, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x2f, 0x2e, 0x71, 0x75, 0x69, 0x6c, 0x69,
+	0x62, 0x72, 0x69, 0x75, 0x6d, 0x2e, 0x6e, 0x6f, 0x64, 0x65, 0x2e, 0x64, 0x61, 0x74, 0x61, 0x2e,
+	0x70, 0x62, 0x2e, 0x43, 0x68, 0x61, 0x6c, 0x6c, 0x65, 0x6e, 0x67, 0x65, 0x50, 0x72, 0x6f, 0x6f,
+	0x66, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x42, 0x3a, 0x5a, 0x38, 0x73, 0x6f, 0x75,
+	0x72, 0x63, 0x65, 0x2e, 0x71, 0x75, 0x69, 0x6c, 0x69, 0x62, 0x72, 0x69, 0x75, 0x6d, 0x2e, 0x63,
+	0x6f, 0x6d, 0x2f, 0x71, 0x75, 0x69, 0x6c, 0x69, 0x62, 0x72, 0x69, 0x75, 0x6d, 0x2f, 0x6d, 0x6f,
+	0x6e, 0x6f, 0x72, 0x65, 0x70, 0x6f, 0x2f, 0x6e, 0x6f, 0x64, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x62, 0x75, 0x66, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_data_proto_rawDescOnce sync.Once
+	file_data_proto_rawDescData = file_data_proto_rawDesc
+)
+
+func file_data_proto_rawDescGZIP() []byte {
+	file_data_proto_rawDescOnce.Do(func() {
+		file_data_proto_rawDescData = protoimpl.X.CompressGZIP(file_data_proto_rawDescData)
+	})
+	return file_data_proto_rawDescData
+}
+
+var file_data_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_data_proto_goTypes = []interface{}{
+	(*ChallengeProofRequest)(nil),  // 0: quilibrium.node.data.pb.ChallengeProofRequest
+	(*ChallengeProofResponse)(nil), // 1: quilibrium.node.data.pb.ChallengeProofResponse
+}
+var file_data_proto_depIdxs = []int32{
+	0, // 0: quilibrium.node.data.pb.DataIPCService.CalculateChallengeProof:input_type -> quilibrium.node.data.pb.ChallengeProofRequest
+	1, // 1: quilibrium.node.data.pb.DataIPCService.CalculateChallengeProof:output_type -> quilibrium.node.data.pb.ChallengeProofResponse
+	1, // [1:2] is the sub-list for method output_type
+	0, // [0:1] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_data_proto_init() }
+func file_data_proto_init() {
+	if File_data_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_data_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ChallengeProofRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_data_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ChallengeProofResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_data_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_data_proto_goTypes,
+		DependencyIndexes: file_data_proto_depIdxs,
+		MessageInfos:      file_data_proto_msgTypes,
+	}.Build()
+	File_data_proto = out.File
+	file_data_proto_rawDesc = nil
+	file_data_proto_goTypes = nil
+	file_data_proto_depIdxs = nil
+}

node/protobufs/data.pb.gw.go

@@ -0,0 +1,171 @@
+// Code generated by protoc-gen-grpc-gateway. DO NOT EDIT.
+// source: data.proto
+
+/*
+Package protobufs is a reverse proxy.
+
+It translates gRPC into RESTful JSON APIs.
+*/
+package protobufs
+
+import (
+	"context"
+	"io"
+	"net/http"
+
+	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"github.com/grpc-ecosystem/grpc-gateway/v2/utilities"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/proto"
+)
+
+// Suppress "imported and not used" errors
+var _ codes.Code
+var _ io.Reader
+var _ status.Status
+var _ = runtime.String
+var _ = utilities.NewDoubleArray
+var _ = metadata.Join
+
+func request_DataIPCService_CalculateChallengeProof_0(ctx context.Context, marshaler runtime.Marshaler, client DataIPCServiceClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq ChallengeProofRequest
+	var metadata runtime.ServerMetadata
+
+	newReader, berr := utilities.IOReaderFactory(req.Body)
+	if berr != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
+	}
+	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := client.CalculateChallengeProof(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+func local_request_DataIPCService_CalculateChallengeProof_0(ctx context.Context, marshaler runtime.Marshaler, server DataIPCServiceServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq ChallengeProofRequest
+	var metadata runtime.ServerMetadata
+
+	newReader, berr := utilities.IOReaderFactory(req.Body)
+	if berr != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
+	}
+	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := server.CalculateChallengeProof(ctx, &protoReq)
+	return msg, metadata, err
+
+}
+
+// RegisterDataIPCServiceHandlerServer registers the http handlers for service DataIPCService to "mux".
+// UnaryRPC     :call DataIPCServiceServer directly.
+// StreamingRPC :currently unsupported pending https://github.com/grpc/grpc-go/issues/906.
+// Note that using this registration option will cause many gRPC library features to stop working. Consider using RegisterDataIPCServiceHandlerFromEndpoint instead.
+func RegisterDataIPCServiceHandlerServer(ctx context.Context, mux *runtime.ServeMux, server DataIPCServiceServer) error {
+
+	mux.Handle("POST", pattern_DataIPCService_CalculateChallengeProof_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		var stream runtime.ServerTransportStream
+		ctx = grpc.NewContextWithServerTransportStream(ctx, &stream)
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		var err error
+		var annotatedContext context.Context
+		annotatedContext, err = runtime.AnnotateIncomingContext(ctx, mux, req, "/quilibrium.node.data.pb.DataIPCService/CalculateChallengeProof", runtime.WithHTTPPathPattern("/quilibrium.node.data.pb.DataIPCService/CalculateChallengeProof"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := local_request_DataIPCService_CalculateChallengeProof_0(annotatedContext, inboundMarshaler, server, req, pathParams)
+		md.HeaderMD, md.TrailerMD = metadata.Join(md.HeaderMD, stream.Header()), metadata.Join(md.TrailerMD, stream.Trailer())
+		annotatedContext = runtime.NewServerMetadataContext(annotatedContext, md)
+		if err != nil {
+			runtime.HTTPError(annotatedContext, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_DataIPCService_CalculateChallengeProof_0(annotatedContext, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
+	return nil
+}
+
+// RegisterDataIPCServiceHandlerFromEndpoint is same as RegisterDataIPCServiceHandler but
+// automatically dials to "endpoint" and closes the connection when "ctx" gets done.
+func RegisterDataIPCServiceHandlerFromEndpoint(ctx context.Context, mux *runtime.ServeMux, endpoint string, opts []grpc.DialOption) (err error) {
+	conn, err := grpc.DialContext(ctx, endpoint, opts...)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err != nil {
+			if cerr := conn.Close(); cerr != nil {
+				grpclog.Infof("Failed to close conn to %s: %v", endpoint, cerr)
+			}
+			return
+		}
+		go func() {
+			<-ctx.Done()
+			if cerr := conn.Close(); cerr != nil {
+				grpclog.Infof("Failed to close conn to %s: %v", endpoint, cerr)
+			}
+		}()
+	}()
+
+	return RegisterDataIPCServiceHandler(ctx, mux, conn)
+}
+
+// RegisterDataIPCServiceHandler registers the http handlers for service DataIPCService to "mux".
+// The handlers forward requests to the grpc endpoint over "conn".
+func RegisterDataIPCServiceHandler(ctx context.Context, mux *runtime.ServeMux, conn *grpc.ClientConn) error {
+	return RegisterDataIPCServiceHandlerClient(ctx, mux, NewDataIPCServiceClient(conn))
+}
+
+// RegisterDataIPCServiceHandlerClient registers the http handlers for service DataIPCService
+// to "mux". The handlers forward requests to the grpc endpoint over the given implementation of "DataIPCServiceClient".
+// Note: the gRPC framework executes interceptors within the gRPC handler. If the passed in "DataIPCServiceClient"
+// doesn't go through the normal gRPC flow (creating a gRPC client etc.) then it will be up to the passed in
+// "DataIPCServiceClient" to call the correct interceptors.
+func RegisterDataIPCServiceHandlerClient(ctx context.Context, mux *runtime.ServeMux, client DataIPCServiceClient) error {
+
+	mux.Handle("POST", pattern_DataIPCService_CalculateChallengeProof_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		var err error
+		var annotatedContext context.Context
+		annotatedContext, err = runtime.AnnotateContext(ctx, mux, req, "/quilibrium.node.data.pb.DataIPCService/CalculateChallengeProof", runtime.WithHTTPPathPattern("/quilibrium.node.data.pb.DataIPCService/CalculateChallengeProof"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_DataIPCService_CalculateChallengeProof_0(annotatedContext, inboundMarshaler, client, req, pathParams)
+		annotatedContext = runtime.NewServerMetadataContext(annotatedContext, md)
+		if err != nil {
+			runtime.HTTPError(annotatedContext, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_DataIPCService_CalculateChallengeProof_0(annotatedContext, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
+	return nil
+}
+
+var (
+	pattern_DataIPCService_CalculateChallengeProof_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1}, []string{"quilibrium.node.data.pb.DataIPCService", "CalculateChallengeProof"}, ""))
+)
+
+var (
+	forward_DataIPCService_CalculateChallengeProof_0 = runtime.ForwardResponseMessage
+)

node/protobufs/data.proto

@@ -0,0 +1,21 @@
+syntax = "proto3";
+
+package quilibrium.node.data.pb;
+
+option go_package = "source.quilibrium.com/quilibrium/monorepo/node/protobufs";
+
+message ChallengeProofRequest {
+  bytes challenge = 1;
+  uint32 core = 2;
+  int64 skew = 3;
+  int64 now_ms = 4;
+}
+
+message ChallengeProofResponse {
+  bytes output = 1;
+  int64 next_skew = 2;
+}
+
+service DataIPCService {
+  rpc CalculateChallengeProof(ChallengeProofRequest) returns (ChallengeProofResponse);
+}

node/protobufs/data_grpc.pb.go

@@ -0,0 +1,109 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.3.0
+// - protoc             v3.21.12
+// source: data.proto
+
+package protobufs
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+const (
+	DataIPCService_CalculateChallengeProof_FullMethodName = "/quilibrium.node.data.pb.DataIPCService/CalculateChallengeProof"
+)
+
+// DataIPCServiceClient is the client API for DataIPCService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type DataIPCServiceClient interface {
+	CalculateChallengeProof(ctx context.Context, in *ChallengeProofRequest, opts ...grpc.CallOption) (*ChallengeProofResponse, error)
+}
+
+type dataIPCServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewDataIPCServiceClient(cc grpc.ClientConnInterface) DataIPCServiceClient {
+	return &dataIPCServiceClient{cc}
+}
+
+func (c *dataIPCServiceClient) CalculateChallengeProof(ctx context.Context, in *ChallengeProofRequest, opts ...grpc.CallOption) (*ChallengeProofResponse, error) {
+	out := new(ChallengeProofResponse)
+	err := c.cc.Invoke(ctx, DataIPCService_CalculateChallengeProof_FullMethodName, in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// DataIPCServiceServer is the server API for DataIPCService service.
+// All implementations must embed UnimplementedDataIPCServiceServer
+// for forward compatibility
+type DataIPCServiceServer interface {
+	CalculateChallengeProof(context.Context, *ChallengeProofRequest) (*ChallengeProofResponse, error)
+	mustEmbedUnimplementedDataIPCServiceServer()
+}
+
+// UnimplementedDataIPCServiceServer must be embedded to have forward compatible implementations.
+type UnimplementedDataIPCServiceServer struct {
+}
+
+func (UnimplementedDataIPCServiceServer) CalculateChallengeProof(context.Context, *ChallengeProofRequest) (*ChallengeProofResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method CalculateChallengeProof not implemented")
+}
+func (UnimplementedDataIPCServiceServer) mustEmbedUnimplementedDataIPCServiceServer() {}
+
+// UnsafeDataIPCServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to DataIPCServiceServer will
+// result in compilation errors.
+type UnsafeDataIPCServiceServer interface {
+	mustEmbedUnimplementedDataIPCServiceServer()
+}
+
+func RegisterDataIPCServiceServer(s grpc.ServiceRegistrar, srv DataIPCServiceServer) {
+	s.RegisterService(&DataIPCService_ServiceDesc, srv)
+}
+
+func _DataIPCService_CalculateChallengeProof_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ChallengeProofRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DataIPCServiceServer).CalculateChallengeProof(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: DataIPCService_CalculateChallengeProof_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DataIPCServiceServer).CalculateChallengeProof(ctx, req.(*ChallengeProofRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// DataIPCService_ServiceDesc is the grpc.ServiceDesc for DataIPCService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var DataIPCService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "quilibrium.node.data.pb.DataIPCService",
+	HandlerType: (*DataIPCServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "CalculateChallengeProof",
+			Handler:    _DataIPCService_CalculateChallengeProof_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "data.proto",
+}

node/rpc/data_worker_ipc_server.go

@@ -0,0 +1,119 @@
+package rpc
+
+import (
+	"context"
+	"os"
+	"runtime"
+	"syscall"
+	"time"
+
+	"source.quilibrium.com/quilibrium/monorepo/node/crypto"
+
+	"github.com/multiformats/go-multiaddr"
+	mn "github.com/multiformats/go-multiaddr/net"
+	"github.com/pkg/errors"
+	"go.uber.org/zap"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/reflection"
+	"source.quilibrium.com/quilibrium/monorepo/node/protobufs"
+)
+
+type DataWorkerIPCServer struct {
+	protobufs.UnimplementedDataIPCServiceServer
+	listenAddrGRPC  string
+	logger          *zap.Logger
+	coreId          uint32
+	prover          crypto.FrameProver
+	parentProcessId int
+}
+
+// GetFrameInfo implements protobufs.NodeServiceServer.
+func (r *DataWorkerIPCServer) CalculateChallengeProof(
+	ctx context.Context,
+	req *protobufs.ChallengeProofRequest,
+) (*protobufs.ChallengeProofResponse, error) {
+	if r.coreId != req.Core {
+		return nil, errors.Wrap(
+			errors.New("invalid core id"),
+			"calculate challenge proof",
+		)
+	}
+
+	proof, nextSkew, err := r.prover.CalculateChallengeProof(
+		req.Challenge,
+		uint32(r.coreId),
+		req.Skew,
+		req.NowMs,
+	)
+	if err != nil {
+		return nil, errors.Wrap(err, "calculate challenge proof")
+	}
+
+	return &protobufs.ChallengeProofResponse{
+		Output:   proof,
+		NextSkew: nextSkew,
+	}, nil
+}
+
+func NewDataWorkerIPCServer(
+	listenAddrGRPC string,
+	logger *zap.Logger,
+	coreId uint32,
+	prover crypto.FrameProver,
+	parentProcessId int,
+) (*DataWorkerIPCServer, error) {
+	return &DataWorkerIPCServer{
+		listenAddrGRPC:  listenAddrGRPC,
+		logger:          logger,
+		coreId:          coreId,
+		prover:          prover,
+		parentProcessId: parentProcessId,
+	}, nil
+}
+
+func (r *DataWorkerIPCServer) Start() error {
+	s := grpc.NewServer(
+		grpc.MaxRecvMsgSize(10*1024*1024),
+		grpc.MaxSendMsgSize(10*1024*1024),
+	)
+	protobufs.RegisterDataIPCServiceServer(s, r)
+	reflection.Register(s)
+
+	mg, err := multiaddr.NewMultiaddr(r.listenAddrGRPC)
+	if err != nil {
+		return errors.Wrap(err, "start")
+	}
+
+	lis, err := mn.Listen(mg)
+	if err != nil {
+		return errors.Wrap(err, "start")
+	}
+
+	go r.monitorParent()
+
+	if err := s.Serve(mn.NetListener(lis)); err != nil {
+		panic(err)
+	}
+
+	return nil
+}
+
+func (r *DataWorkerIPCServer) monitorParent() {
+	for {
+		time.Sleep(1 * time.Second)
+		proc, err := os.FindProcess(r.parentProcessId)
+		if err != nil {
+			r.logger.Error("parent process not found, terminating")
+			os.Exit(1)
+		}
+
+		// Windows returns an error if the process is dead, nobody else does
+		if runtime.GOOS != "windows" {
+			err := proc.Signal(syscall.Signal(0))
+			if err != nil {
+				r.logger.Error("parent process not found, terminating")
+				os.Exit(1)
+			}
+		}
+	}
+}