hyperledger/fabric · error

error validating DeltaSet

Error message

error validating DeltaSet

What it means

verifyDeltaSet failed on the computed delta of the update; this wraps either error 150 (missing mod policy) or 151 (policy not satisfied). The set of actual changes implied by the ReadSet/WriteSet could not be authorized under the channel's modification policies with the supplied signatures.

Source

Thrown at common/configtx/update.go:151

	}
	err = vi.verifyReadSet(readSet)
	if err != nil {
		return nil, errors.Wrapf(err, "error validating ReadSet")
	}

	writeSet, err := mapConfig(configUpdate.WriteSet, vi.namespace)
	if err != nil {
		return nil, errors.Wrapf(err, "error mapping WriteSet")
	}

	deltaSet := computeDeltaSet(readSet, writeSet)
	signedData, err := protoutil.ConfigUpdateEnvelopeAsSignedData(configUpdateEnv)
	if err != nil {
		return nil, err
	}

	if err = vi.verifyDeltaSet(deltaSet, signedData); err != nil {
		return nil, errors.Wrapf(err, "error validating DeltaSet")
	}

	fullProposedConfig := vi.computeUpdateResult(deltaSet)
	if err := verifyFullProposedConfig(writeSet, fullProposedConfig); err != nil {
		return nil, errors.Wrapf(err, "full config did not verify")
	}

	return fullProposedConfig, nil
}

func (vi *ValidatorImpl) policyForItem(item comparable) (policies.Policy, bool) {
	manager := vi.pm

	modPolicy := item.modPolicy()
	logger.Debugf("Getting policy for item %s with mod_policy %s", item.key, modPolicy)

	// If the mod_policy path is relative, get the right manager for the context
	// If the item has a zero length path, it is the root group, use the base policy manager

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Read the wrapped inner error: if it's a missing policy fix the config's mod_policy references; if unsatisfied, collect the right signatures.
2. Sign the update with identities satisfying each changed key's mod_policy (usually org/channel Admins) via `peer channel signconfigtx`.
3. Refresh signing certificates after MSP rotation before signing.
4. Reduce the update to only intended keys — accidental diffs pull in items whose policies you cannot satisfy.

Example fix

// before: env submitted with only the proposer's signature
// after: collect all required admin signatures before submit
for _, signer := range requiredAdminSigners {
    env, _ = utils.SignEnvelope(env, signer.MSPID, signer.Signer)
}

// Pre-flight: list every changed key and its mod_policy so signatures can be pre-collected
func pendingPolicies(update *cb.ConfigUpdate) []string {
    var needed []string
    // compute delta and collect mod_policy of each added/updated/removed item
    return needed
}

if _, err := validator.ProposeConfigUpdate(env, seq); err != nil {
    if strings.Contains(err.Error(), "error validating DeltaSet") {
        // inspect wrapped cause: missing policy -> fix config; unsatisfied -> add signatures
    }
    return err
}

When it happens

Trigger: Calling proposeConfigUpdate/Validate where computeDeltaSet yields changes whose mod_policies are missing from the config or not satisfied by the envelope's signatures.

Common situations: Same root causes as missing-policy and policy-not-satisfied: unsigned or under-signed updates, stale MSP certs, updates touching items whose mod_policy was removed; also attempting changes that require a higher-level policy (e.g. channel Admins) while only supplying org-level signatures.

Related errors

• policy for %s not satisfied
• missing policy at path: %s
• ConfigPolicy not found at policy path: %s
• unexpected missing policy %s for item %s
• error authorizing update: %s

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/5e6c52bea9d14f97. Report an issue: GitHub.