{"record":{"id":"aa116ad302323063","repo":"hyperledger/fabric","slug":"this-msp-does-not-possess-a-valid-default-signing","errorCode":null,"errorMessage":"this MSP does not possess a valid default signing identity","messagePattern":"this MSP does not possess a valid default signing identity","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"msp/mspimpl.go","lineNumber":311,"sourceCode":"}\n\n// GetTLSRootCerts returns the root certificates for this MSP\nfunc (msp *bccspmsp) GetTLSRootCerts() [][]byte {\n\treturn msp.tlsRootCerts\n}\n\n// GetTLSIntermediateCerts returns the intermediate root certificates for this MSP\nfunc (msp *bccspmsp) GetTLSIntermediateCerts() [][]byte {\n\treturn msp.tlsIntermediateCerts\n}\n\n// GetDefaultSigningIdentity returns the\n// default signing identity for this MSP (if any)\nfunc (msp *bccspmsp) GetDefaultSigningIdentity() (SigningIdentity, error) {\n\tmspLogger.Debugf(\"Obtaining default signing identity\")\n\n\tif msp.signer == nil {\n\t\treturn nil, errors.New(\"this MSP does not possess a valid default signing identity\")\n\t}\n\n\treturn msp.signer, nil\n}\n\n// Validate attempts to determine whether\n// the supplied identity is valid according\n// to this MSP's roots of trust; it returns\n// nil in case the identity is valid or an\n// error otherwise\nfunc (msp *bccspmsp) Validate(id Identity) error {\n\tmspLogger.Debugf(\"MSP %s validating identity\", msp.name)\n\n\tswitch id := id.(type) {\n\t// If this identity is of this specific type,\n\t// this is how I can validate it given the\n\t// root of trust this MSP has\n\tcase *identity:","sourceCodeStart":293,"sourceCodeEnd":329,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/msp/mspimpl.go#L293-L329","documentation":"GetDefaultSigningIdentity returns msp.signer, the default signing identity configured for this MSP instance. When msp.signer is nil — the MSP was set up with no signing (private key + cert) material, e.g. a verification-only or peer-side MSP — the function returns this error instead of a nil identity. It signals the caller cannot obtain a signer from this MSP.","triggerScenarios":"Calling GetDefaultSigningIdentity on an MSP loaded without an admincerts/signcerts/keystore trio (Setup derived no signer), typically on orderer/peer local MSPs of remote organizations, or when keystore files are missing/empty so internalSetup left msp.signer unset; also from client SDK paths (e.g. mspmgmt.GetLocalSigningIdentityOrPanic equivalents) pointing at an MSP directory lacking the 'signcerts' and 'keystore' entries.","commonSituations":"Pointing the local MSP path at another org's MSP directory that only contains cacerts; a keystore directory emptied by a bad volume mount in docker/kubernetes; running an application that tries to endorse/submit transactions using a peer's MSP that was set up for validation only.","solutions":["Point the local MSP directory at one containing both msp/signcerts/*.pem and msp/keystore/*_sk so Setup can construct the default signer","Regenerate crypto material with cryptogen/fabric-ca for the identity you intend to sign with and reload the MSP","If signing should be done by a different identity, obtain the correct MSP/signing provider instead of using this verification-only MSP","Check file permissions/ownership so the process can read the private key file in keystore (unreadable keys can leave signer unset)"],"exampleFix":"// before: MSP dir missing signing material\nmspDir := \"./crypto/peerOrganizations/org1/peers/peer0/msp\" // no signcerts/keystore\nid, err := msp.GetDefaultSigningIdentity() // error\n\n// after: ensure signcerts + keystore exist, or use the user's own MSP dir\nmspDir := \"./crypto/peerOrganizations/org1/users/Admin@org1/msp\"\nid, err := msp.GetDefaultSigningIdentity() // returns signer","handlingStrategy":"type-guard","validationCode":"// before calling, ensure the MSP dir has signing material\nsignCerts, _ := filepath.Glob(filepath.Join(mspDir, \"signcerts\", \"*.pem\"))\nkeys, _ := filepath.Glob(filepath.Join(mspDir, \"keystore\", \"*_sk\"))\nif len(signCerts) == 0 || len(keys) == 0 {\n    return fmt.Errorf(\"MSP dir %s lacks signing identity material\", mspDir)\n}","typeGuard":"id, err := msp.GetDefaultSigningIdentity()\nif err != nil || id == nil {\n    // MSP has no signer; fall back to an explicitly loaded user identity\n    id, err = loadUserSigningIdentity(\"Admin@org1\")\n}","tryCatchPattern":"signer, err := msp.GetDefaultSigningIdentity()\nif err != nil {\n    if strings.Contains(err.Error(), \"does not possess a valid default signing identity\") {\n        return useAlternateIdentityProvider() // e.g. fabric-ca enrolled identity\n    }\n    return err\n}","preventionTips":["Keep signcerts/ and keystore/ populated in every local MSP dir used for signing","Never mount an org-level (validation-only) MSP where a client identity MSP is required","Check keystore file read permissions after container deployments","Explicitly enroll/register identities with fabric-ca instead of copying peer MSP dirs"],"tags":["hyperledger-fabric","msp","signing-identity","keystore"],"backgroundTag":"missing-signing-identity","analyzedSha":"2736b63f8fd5932511d56fe68b7039d15977f7f6","analyzedAt":"2026-09-04T08:52:36.465Z","contentChangedAt":"2026-09-04T08:52:36.465Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}