---
title: "Create policy-gated wallet-key digest signature"
method: POST
path: "/kms/sign-digest"
tags: ["WalletUnitKeySigning"]
---

# Create policy-gated wallet-key digest signature

`POST /kms/sign-digest`

Signs a precomputed digest with a Wallet Unit key after the same
lifecycle and activation-decision checks as raw signing. This endpoint
is intended for flows that already compute the operation digest before
invoking the Wallet Unit KMS policy layer.

## Request body

- WalletDigestSignHttpRequest — unresolved $ref

## Response `200`

Signature result.

- WalletSignatureHttpResponse — unresolved $ref

## Other responses

- `400` — unresolved $ref
- `401` — unresolved $ref
- `403` — unresolved $ref
- `404` — unresolved $ref

---

[API](https://skmtc.dev/sphereon-opensource/apis/wallet-unit-api.md) · [All operations](https://skmtc.dev/sphereon-opensource/apis/wallet-unit-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/sphereon-opensource/wallet-unit-api/revisions/a9ffec140ea7/schema)