diff --git a/pkg/tbtc/chain.go b/pkg/tbtc/chain.go
index b9670bcdd7..49fdc59ed2 100644
--- a/pkg/tbtc/chain.go
+++ b/pkg/tbtc/chain.go
@@ -107,13 +107,6 @@ type DistributedKeyGenerationChain interface {
 		startBlock uint64,
 	) (dkg.ResultSignatureHash, error)
 
-	CalculateInactivityClaimSignatureHash(
-		nonce *big.Int,
-		walletPublicKey *ecdsa.PublicKey,
-		inactiveMembersIndexes []group.MemberIndex,
-		heartbeatFailed bool,
-	) (inactivity.ClaimSignatureHash, error)
-
 	// IsDKGResultValid checks whether the submitted DKG result is valid from
 	// the on-chain contract standpoint.
 	IsDKGResultValid(dkgResult *DKGChainResult) (bool, error)
@@ -128,6 +121,18 @@ type DistributedKeyGenerationChain interface {
 	DKGParameters() (*DKGParameters, error)
 }
 
+type InactivityClaimChain interface {
+	// CalculateInactivityClaimSignatureHash calculates hash for the given
+	// inactivity claim.
+	CalculateInactivityClaimSignatureHash(
+		claim *inactivity.Claim,
+	) (inactivity.ClaimSignatureHash, error)
+
+	// GetInactivityClaimNonce returns inactivity claim nonce for the given
+	// wallet.
+	GetInactivityClaimNonce(walletID [32]byte) (*big.Int, error)
+}
+
 // DKGChainResultHash represents a hash of the DKGChainResult. The algorithm
 // used is specific to the chain.
 type DKGChainResultHash [32]byte
@@ -461,6 +466,7 @@ type Chain interface {
 	sortition.Chain
 	GroupSelectionChain
 	DistributedKeyGenerationChain
+	InactivityClaimChain
 	BridgeChain
 	WalletProposalValidatorChain
 }
diff --git a/pkg/tbtc/heartbeat.go b/pkg/tbtc/heartbeat.go
index 695a35c7e9..5aae33bd85 100644
--- a/pkg/tbtc/heartbeat.go
+++ b/pkg/tbtc/heartbeat.go
@@ -189,6 +189,9 @@ func (ha *heartbeatAction) execute() error {
 	// The value of consecutive heartbeat failures exceeds the threshold.
 	// Proceed with operator inactivity notification.
 	err = ha.inactivityClaimExecutor.publishClaim(
+		// Leave the list empty. Some operators were inactive during the
+		// heartbeat because they were simply unstaking and therefore should not
+		// be punished.
 		[]group.MemberIndex{},
 		true,
 	)
diff --git a/pkg/tbtc/inactivity.go b/pkg/tbtc/inactivity.go
index 4988bedc1f..b66bcaf031 100644
--- a/pkg/tbtc/inactivity.go
+++ b/pkg/tbtc/inactivity.go
@@ -2,17 +2,28 @@ package tbtc
 
 import (
 	"context"
+	"fmt"
 	"math/big"
 	"sync"
 
 	"github.com/ipfs/go-log/v2"
+	"golang.org/x/sync/semaphore"
+
+	"github.com/keep-network/keep-core/pkg/bitcoin"
 	"github.com/keep-network/keep-core/pkg/generator"
 	"github.com/keep-network/keep-core/pkg/net"
 	"github.com/keep-network/keep-core/pkg/protocol/group"
 	"github.com/keep-network/keep-core/pkg/tecdsa/inactivity"
 )
 
+// errInactivityExecutorBusy is an error returned when the inactivity claim
+// executor cannot execute the inactivity claim due to another inactivity claim
+// execution in progress.
+var errInactivityExecutorBusy = fmt.Errorf("inactivity claim executor is busy")
+
 type inactivityClaimExecutor struct {
+	lock *semaphore.Weighted
+
 	chain   Chain
 	signers []*signer
 
@@ -25,6 +36,7 @@ func newInactivityClaimExecutor(
 	signers []*signer,
 ) *inactivityClaimExecutor {
 	return &inactivityClaimExecutor{
+		lock:    semaphore.NewWeighted(1),
 		chain:   chain,
 		signers: signers,
 	}
@@ -34,9 +46,32 @@ func (ice *inactivityClaimExecutor) publishClaim(
 	inactiveMembersIndexes []group.MemberIndex,
 	heartbeatFailed bool,
 ) error {
-	// TODO: Build a claim and launch the publish function for all
-	//       the signers. The value of `heartbeat` should be true and
-	//       `inactiveMembersIndices` should be empty.
+	if lockAcquired := ice.lock.TryAcquire(1); !lockAcquired {
+		return errSigningExecutorBusy
+	}
+	defer ice.lock.Release(1)
+
+	walletPublicKey := ice.wallet().publicKey
+	walletPublicKeyHash := bitcoin.PublicKeyHash(walletPublicKey)
+
+	walletRegistryData, err := ice.chain.GetWallet(walletPublicKeyHash)
+	if err != nil {
+		return fmt.Errorf("could not get registry data on wallet: [%v]", err)
+	}
+
+	nonce, err := ice.chain.GetInactivityClaimNonce(
+		walletRegistryData.EcdsaWalletID,
+	)
+	if err != nil {
+		return fmt.Errorf("could not get nonce for wallet: [%v]", err)
+	}
+
+	claim := &inactivity.Claim{
+		Nonce:                  nonce,
+		WalletPublicKey:        walletPublicKey,
+		InactiveMembersIndexes: inactiveMembersIndexes,
+		HeartbeatFailed:        heartbeatFailed,
+	}
 
 	wg := sync.WaitGroup{}
 	wg.Add(len(ice.signers))
@@ -50,6 +85,9 @@ func (ice *inactivityClaimExecutor) publishClaim(
 		}(currentSigner)
 	}
 
+	// Wait until all controlled signers complete their routine.
+	wg.Wait()
+
 	return nil
 }
 
@@ -78,3 +116,9 @@ func (ice *inactivityClaimExecutor) publish(
 		inactivityClaim,
 	)
 }
+
+func (ice *inactivityClaimExecutor) wallet() wallet {
+	// All signers belong to one wallet. Take that wallet from the
+	// first signer.
+	return ice.signers[0].wallet
+}
diff --git a/pkg/tbtc/inactivity_submit.go b/pkg/tbtc/inactivity_submit.go
index 1bbf70e0b8..8e7ad856a4 100644
--- a/pkg/tbtc/inactivity_submit.go
+++ b/pkg/tbtc/inactivity_submit.go
@@ -30,12 +30,7 @@ func (ics *inactivityClaimSigner) SignClaim(claim *inactivity.Claim) (
 		return nil, fmt.Errorf("result is nil")
 	}
 
-	claimHash, err := ics.chain.CalculateInactivityClaimSignatureHash(
-		claim.Nonce,
-		claim.WalletPublicKey,
-		claim.InactiveMembersIndexes,
-		claim.HeartbeatFailed,
-	)
+	claimHash, err := ics.chain.CalculateInactivityClaimSignatureHash(claim)
 	if err != nil {
 		return nil, fmt.Errorf(
 			"inactivity claim hash calculation failed [%w]",