hyperledger/fabric · error

Could not serialize the signing identity: %s

Error message

Could not serialize the signing identity: %s

What it means

When an owner (endorser) is supplied, OwnerCreateSignedCCDepSpec calls owner.Serialize() to embed the signing identity in the endorsement. If Serialize fails — typically because the identity's underlying MSP credentials are missing, malformed, or expired — the error is wrapped with the underlying cause.

Source

Thrown at core/common/ccpackage/ccpackage.go:182

	}

	if instPolicy == nil {
		return nil, errors.New("must provide an instantiation policy")
	}

	cdsbytes := protoutil.MarshalOrPanic(cds)

	instpolicybytes := protoutil.MarshalOrPanic(instPolicy)

	var endorsements []*peer.Endorsement
	// it is not mandatory (at this protoutil level) to have a signature
	// this is especially convenient during dev/test
	// it may be necessary to enforce it via a policy at a higher level
	if owner != nil {
		// serialize the signing identity
		endorser, err := owner.Serialize()
		if err != nil {
			return nil, fmt.Errorf("Could not serialize the signing identity: %s", err)
		}

		// sign the concatenation of cds, instpolicy and the serialized endorser identity with this endorser's key
		signature, err := owner.Sign(append(cdsbytes, append(instpolicybytes, endorser...)...))
		if err != nil {
			return nil, fmt.Errorf("Could not sign the ccpackage, err %s", err)
		}

		// each owner starts off the endorsements with one element. All such endorsed
		// packages will be collected in a final package by CreateSignedCCDepSpecForInstall
		// when endorsements will have all the entries
		endorsements = make([]*peer.Endorsement, 1)

		endorsements[0] = &peer.Endorsement{Signature: signature, Endorser: endorser}
	}

	return createSignedCCDepSpec(cdsbytes, instpolicybytes, endorsements)
}

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Verify the local MSP is properly initialized (peer/node start, or mspmgmt.GetLocalMSP) and that signer cert/key files exist under msp/signcerts and msp/keystore
2. Regenerate or re-import crypto material (cryptogen generate / Fabric CA enroll) so the identity is valid
3. Check the wrapped %s cause in the message — it names the specific MSP/serialization failure and fixes that underlying error
4. Ensure FABRIC_CFG_PATH/CORE_PEER_LOCALMSPID/CORE_PEER_MSPCONFIGPATH point to the correct MSP directory

Example fix

// before
signer, err := mspmgmt.GetLocalMSP().GetDefaultSigner() // may return unusable signer if MSP unconfigured
env, _ := ccpackage.OwnerCreateSignedCCDepSpec(cds, policy, signer)
// after
signer, err := mspmgmt.GetLocalMSP().GetDefaultSigner()
if err != nil { return fmt.Errorf("no local signer: %w", err) }
if _, err := signer.Serialize(); err != nil { return fmt.Errorf("identity not serializable, check MSP config: %w", err) }
env, err := ccpackage.OwnerCreateSignedCCDepSpec(cds, policy, signer)

if owner != nil {
    if _, err := owner.Serialize(); err != nil {
        return fmt.Errorf("signing identity unusable, check MSP config: %w", err)
    }
}

func canSerialize(s identity.SignerSerializer) bool {
    if s == nil { return false }
    _, err := s.Serialize()
    return err == nil
}

env, err := ccpackage.OwnerCreateSignedCCDepSpec(cds, policy, owner)
if err != nil {
    if strings.HasPrefix(err.Error(), "Could not serialize the signing identity") {
        return fmt.Errorf("fix local MSP (FABRIC_CFG_PATH / mspconfig): %w", err)
    }
    return err
}

When it happens

Trigger: Passing a SignerSerializer whose MSP identity cannot be serialized: uninitialized local MSP, missing signer cert/key, corrupted mspConfigPath, or a custom SignerSerializer implementation returning an error from Serialize.

Common situations: peer not enrolled (no cryptogen/Fabric CA material in MSPDIR); FABRIC_CFG_PATH pointing to a config without the right msp section; stale certificates after org crypto material regeneration; identity types not supported by the configured MSP provider.

Related errors

• Unable to extract msp.Identity from peer Identity
• failed unmarshaling identity %s
• access denied: channel [%s] creator org unknown, creator is
• Failed deserializing proposal creator during channelless che
• failed unmarshalling peer's identity

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/b916f948f654a0f4. Report an issue: GitHub.