diff --git a/pkg/storageincentives/proof.go b/pkg/storageincentives/proof.go
index ebf4eede513..6eb6b9cd56b 100644
--- a/pkg/storageincentives/proof.go
+++ b/pkg/storageincentives/proof.go
@@ -18,7 +18,7 @@ import (
 	"github.com/ethersphere/bee/pkg/swarm"
 )
 
-var errorMessage = errors.New("reserve commitment hasher: failure in proof creation")
+var errMessage = errors.New("reserve commitment hasher: failure in proof creation")
 
 // makeInclusionProofs creates transaction data for claim method.
 // In the document this logic, result data, is also called Proof of entitlement (POE).
@@ -59,17 +59,17 @@ func makeInclusionProofs(
 	rccontent.SetHeaderInt64(swarm.HashSize * storer.SampleSize * 2)
 	rsc, err := sampleChunk(reserveSampleItems)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	rscData := rsc.Data()
 	_, err = rccontent.Write(rscData[swarm.SpanSize:])
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	pr := bmt.Prover{Hasher: rccontent}
 	_, err = pr.Hash(nil)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	proof1p1 := pr.Proof(int(require1) * 2)
 	proof2p1 := pr.Proof(int(require2) * 2)
@@ -84,12 +84,12 @@ func makeInclusionProofs(
 	chunk1ContentPayload := reserveSampleItems[require1].ChunkData[swarm.SpanSize:]
 	_, err = chunk1Content.Write(chunk1ContentPayload)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	pr = bmt.Prover{Hasher: chunk1Content}
 	_, err = pr.Hash(nil)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	proof1p2 := pr.Proof(segmentIndex)
 	// TR chunk proof
@@ -97,11 +97,11 @@ func makeInclusionProofs(
 	chunk1TrContent.SetHeader(reserveSampleItems[require1].ChunkData[:swarm.SpanSize])
 	_, err = chunk1TrContent.Write(chunk1ContentPayload)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	_, err = chunk1TrContent.Hash(nil)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	pr = bmt.Prover{Hasher: chunk1TrContent}
 	proof1p3 := pr.Proof(segmentIndex)
@@ -116,12 +116,12 @@ func makeInclusionProofs(
 	chunk2Content.SetHeader(reserveSampleItems[require2].ChunkData[:swarm.SpanSize])
 	_, err = chunk2Content.Write(chunk2ContentPayload)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	pr = bmt.Prover{Hasher: chunk2Content}
 	_, err = pr.Hash(nil)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	proof2p2 := pr.Proof(segmentIndex)
 	// TR Chunk proof
@@ -129,12 +129,12 @@ func makeInclusionProofs(
 	chunk2TrContent.SetHeader(reserveSampleItems[require2].ChunkData[:swarm.SpanSize])
 	_, err = chunk2TrContent.Write(chunk2ContentPayload)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	pr = bmt.Prover{Hasher: chunk2TrContent}
 	_, err = pr.Hash(nil)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	proof2p3 := pr.Proof(segmentIndex)
 	// cleanup
@@ -148,12 +148,12 @@ func makeInclusionProofs(
 	chunkLastContentPayload := reserveSampleItems[require3].ChunkData[swarm.SpanSize:]
 	_, err = chunkLastContent.Write(chunkLastContentPayload)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	pr = bmt.Prover{Hasher: chunkLastContent}
 	_, err = pr.Hash(nil)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	proofLastp2 := pr.Proof(segmentIndex)
 	// TR Chunk Proof
@@ -161,12 +161,12 @@ func makeInclusionProofs(
 	chunkLastTrContent.SetHeader(reserveSampleItems[require3].ChunkData[:swarm.SpanSize])
 	_, err = chunkLastTrContent.Write(chunkLastContentPayload)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	pr = bmt.Prover{Hasher: chunkLastTrContent}
 	_, err = pr.Hash(nil)
 	if err != nil {
-		return redistribution.ChunkInclusionProofs{}, errorMessage
+		return redistribution.ChunkInclusionProofs{}, errMessage
 	}
 	proofLastp3 := pr.Proof(segmentIndex)
 	// cleanup