diff --git a/js/packages/truapi/README.md b/js/packages/truapi/README.md
index 46d47676d..9a456eb04 100644
--- a/js/packages/truapi/README.md
+++ b/js/packages/truapi/README.md
@@ -72,6 +72,13 @@ sub.unsubscribe();
 - **Sandbox bootstrap** (`@parity/truapi/sandbox`) that detects the host environment, builds the
   matching provider, and exposes a cached client — see below.
 
+## Development escape hatches
+
+- **`development_createAccountProof(client, request)`** — `account.createAccountProof`
+  with `context` given as the exact 32-byte hex the proof is bound to, instead of a
+  product-namespaced `ProductProofContext`. Yet to be removed before a production
+  release; it lives entirely in `src/development.ts`.
+
 ## Sandbox bootstrap
 
 `@parity/truapi/sandbox` wires up a client for browser-embedded hosts: it detects whether the app
diff --git a/js/packages/truapi/src/development.test.ts b/js/packages/truapi/src/development.test.ts
new file mode 100644
index 000000000..92a30514a
--- /dev/null
+++ b/js/packages/truapi/src/development.test.ts
@@ -0,0 +1,51 @@
+import { describe, expect, test } from "bun:test";
+import { okAsync } from "neverthrow";
+import { development_createAccountProof } from "./development.js";
+import type { HostAccountCreateProofRequest } from "./generated/index.js";
+
+const context = `0x${"ab".repeat(32)}` as const;
+const base = {
+    keyHandle: { dotNsIdentifier: "dim2.dot", derivationIndex: { tag: "Index", value: 0 } },
+    ringLocation: { chainId: `0x${"00".repeat(32)}`, junctions: [] },
+    message: "0x01",
+} as const;
+
+function stub() {
+    const seen: HostAccountCreateProofRequest[] = [];
+    const client = {
+        account: {
+            createAccountProof(request: HostAccountCreateProofRequest) {
+                seen.push(request);
+                return okAsync({
+                    proof: "0x",
+                    contextualAlias: { context, alias: "0x" },
+                    ringIndex: 0,
+                    ringRevision: 0,
+                });
+            },
+        },
+    };
+    return {
+        seen,
+        client: client as unknown as Parameters<typeof development_createAccountProof>[0],
+    };
+}
+
+describe("development_createAccountProof", () => {
+    test("forwards the request with the raw context marker", async () => {
+        const { seen, client } = stub();
+        await development_createAccountProof(client, { ...base, context });
+        expect(seen).toEqual([
+            { ...base, context: { productId: "raw:", suffix: { tag: "Raw", value: context } } },
+        ]);
+    });
+
+    test("rejects contexts that are not 32 bytes of hex", () => {
+        const { client } = stub();
+        for (const bad of ["0x00", "ab".repeat(32), `0x${"zz".repeat(32)}`]) {
+            expect(() =>
+                development_createAccountProof(client, { ...base, context: bad as `0x${string}` }),
+            ).toThrow(TypeError);
+        }
+    });
+});
diff --git a/js/packages/truapi/src/development.ts b/js/packages/truapi/src/development.ts
new file mode 100644
index 000000000..41aec66af
--- /dev/null
+++ b/js/packages/truapi/src/development.ts
@@ -0,0 +1,60 @@
+// TODO(development_createAccountProof): dev-only escape hatch, yet to be
+// removed before a production release. Everything for it lives in this file,
+// its test and one re-export in `index.ts`; delete those to remove it.
+import type {
+  HostAccountCreateProofRequest,
+  HostAccountCreateProofResponse,
+  ProductProofContext,
+  TrUApiClient,
+  VersionedHostAccountCreateProofError,
+} from "./generated/index.js";
+import type { ResultAsync } from "./generated/client.js";
+import type { CallErrorValue, HexString } from "./scale.js";
+
+/** `productId` the signing host reads as "use the suffix bytes verbatim". */
+const RAW_PROOF_CONTEXT_PRODUCT_ID = "raw:";
+
+/** Same as `HostAccountCreateProofRequest`, with the 32-byte context given raw. */
+export interface DevelopmentCreateProofRequest extends Omit<
+  HostAccountCreateProofRequest,
+  "context"
+> {
+  /** The exact 32 bytes the proof is bound to, as `0x`-prefixed hex. */
+  context: HexString;
+}
+
+/**
+ * `account.createAccountProof` with a verbatim 32-byte proof context instead of
+ * a product-namespaced one.
+ *
+ */
+export function development_createAccountProof(
+  client: Pick<TrUApiClient, "account">,
+  request: DevelopmentCreateProofRequest,
+): ResultAsync<
+  HostAccountCreateProofResponse,
+  CallErrorValue<VersionedHostAccountCreateProofError>
+> {
+  const { context, ...rest } = request;
+  return client.account.createAccountProof({
+    ...rest,
+    context: rawProofContext(context),
+  });
+}
+
+function rawProofContext(context: HexString): ProductProofContext {
+  const digits = context.startsWith("0x") ? context.slice(2) : null;
+  if (
+    digits === null ||
+    digits.length !== 64 ||
+    !/^[0-9a-fA-F]*$/.test(digits)
+  ) {
+    throw new TypeError(
+      `development_createAccountProof: context must be 32 bytes of 0x-prefixed hex, got ${JSON.stringify(context)}`,
+    );
+  }
+  return {
+    productId: RAW_PROOF_CONTEXT_PRODUCT_ID,
+    suffix: { tag: "Raw", value: context },
+  };
+}
diff --git a/js/packages/truapi/src/index.ts b/js/packages/truapi/src/index.ts
index 2648df85b..726ddd851 100644
--- a/js/packages/truapi/src/index.ts
+++ b/js/packages/truapi/src/index.ts
@@ -30,3 +30,4 @@ export * as scale from "./scale.js";
 export type { Codec, HexString } from "./scale.js";
 export * from "./generated/index.js";
 export * from "./well-known-chains.js";
+export * from "./development.js";
diff --git a/rust/crates/truapi-host-cli/README.md b/rust/crates/truapi-host-cli/README.md
index 60e18db2c..86f67920e 100644
--- a/rust/crates/truapi-host-cli/README.md
+++ b/rust/crates/truapi-host-cli/README.md
@@ -105,6 +105,13 @@ make headless install  # build dependencies and install truapi-host once
 truapi-host signing-host
 ```
 
+### Raw proof contexts (development only)
+
+A product can bind a ring-VRF proof to 32 bytes of its choosing instead of a
+product-namespaced context by calling `development_createAccountProof` from
+`@parity/truapi`; the signing host honours it as is. Yet to be removed before a
+production release.
+
 ### Browser products
 
 `truapi-host dev` is one command for "run this product as if it were inside a
diff --git a/rust/crates/truapi-server/src/runtime/pairing_host.rs b/rust/crates/truapi-server/src/runtime/pairing_host.rs
index be64b953b..d68e5f231 100644
--- a/rust/crates/truapi-server/src/runtime/pairing_host.rs
+++ b/rust/crates/truapi-server/src/runtime/pairing_host.rs
@@ -56,8 +56,8 @@ use zeroize::Zeroizing;
 
 use super::ring_vrf_registry::{RingVrfRegistryStore, validate_owner_listing};
 use super::signing_host::ring_vrf::{
-    ChainRingResolver, MemberCandidate, RingResolver, alias_from_entropy, context_bytes,
-    create_proof, member_from_entropy, sign_from_entropy,
+    ChainRingResolver, MemberCandidate, RingResolver, alias_from_entropy, create_proof,
+    development_context_bytes, member_from_entropy, sign_from_entropy,
 };
 
 /// Distinguishes all remote authority request entrypoints by wire label.
@@ -2127,7 +2127,7 @@ impl PairingHost {
         {
             self.ring_resolver.validate(&request.ring_location).await?;
             self.current_private_session(session)?;
-            let context = context_bytes(&request.context);
+            let context = development_context_bytes(&request.context);
             let alias = alias_from_entropy(&entropy, &context)?;
             return Ok(v01::ContextualAlias {
                 context,
@@ -2160,7 +2160,7 @@ impl PairingHost {
                 .resolve(&request.ring_location, &[MemberCandidate { member }])
                 .await?;
             self.current_private_session(session)?;
-            let context = context_bytes(&request.context);
+            let context = development_context_bytes(&request.context);
             let (proof, alias) = create_proof(&entropy, &resolved, &context, &request.message)?;
             return Ok(v01::HostAccountCreateProofResponse {
                 proof,
diff --git a/rust/crates/truapi-server/src/runtime/signing_host.rs b/rust/crates/truapi-server/src/runtime/signing_host.rs
index 3469cef32..d2f0c82d2 100644
--- a/rust/crates/truapi-server/src/runtime/signing_host.rs
+++ b/rust/crates/truapi-server/src/runtime/signing_host.rs
@@ -65,8 +65,8 @@ use crate::runtime::statement_allowance::CollectionCandidate;
 #[cfg(not(target_arch = "wasm32"))]
 use crate::runtime::statement_allowance::collection::PersonhoodCollection;
 use ring_vrf::{
-    ChainRingResolver, MemberCandidate, RingResolver, alias_from_entropy, context_bytes,
-    create_proof, member_from_entropy, sign_from_entropy,
+    ChainRingResolver, MemberCandidate, RingResolver, alias_from_entropy, create_proof,
+    development_context_bytes, member_from_entropy, sign_from_entropy,
 };
 use sso_replay::SsoReplayLocks;
 
@@ -839,7 +839,7 @@ impl ProductAuthority for SigningHost {
             .resolve_ring_vrf_key_for_ring(session, &request.key_handle, &request.ring_location)
             .await?;
         self.ring_resolver.validate(&request.ring_location).await?;
-        let context = context_bytes(&request.context);
+        let context = development_context_bytes(&request.context);
         let alias = alias_from_entropy(&entropy, &context)?;
         Ok(v01::ContextualAlias {
             context,
@@ -866,7 +866,7 @@ impl ProductAuthority for SigningHost {
         // Reject a stale request if the local session disconnected or changed
         // while its chain snapshot was being resolved.
         self.require_current_session(session)?;
-        let context = context_bytes(&request.context);
+        let context = development_context_bytes(&request.context);
         let (proof, alias) = create_proof(&entropy, &resolved, &context, &request.message)?;
         Ok(v01::HostAccountCreateProofResponse {
             proof,
diff --git a/rust/crates/truapi-server/src/runtime/signing_host/ring_vrf.rs b/rust/crates/truapi-server/src/runtime/signing_host/ring_vrf.rs
index 7e6e51b8e..11a49ab92 100644
--- a/rust/crates/truapi-server/src/runtime/signing_host/ring_vrf.rs
+++ b/rust/crates/truapi-server/src/runtime/signing_host/ring_vrf.rs
@@ -212,6 +212,27 @@ impl RingResolver for ChainRingResolver {
     }
 }
 
+// TODO(development_createAccountProof): dev-only escape hatch, yet to be
+// removed before a production release. Delete this module and point its
+// callers in `signing_host.rs` and `pairing_host.rs` back at `context_bytes`.
+mod development {
+    use truapi::v01::{DerivationIndex, ProductProofContext};
+
+    const RAW_CONTEXT_PRODUCT_ID: &str = "raw:";
+
+    /// [`super::context_bytes`], except that the `raw:` product id (which
+    /// dotNS cannot issue) makes the `Raw` suffix the context, verbatim.
+    pub(in crate::runtime) fn development_context_bytes(context: &ProductProofContext) -> [u8; 32] {
+        if context.product_id == RAW_CONTEXT_PRODUCT_ID
+            && let DerivationIndex::Raw(bytes) = context.suffix
+        {
+            return bytes;
+        }
+        super::context_bytes(context)
+    }
+}
+pub(in crate::runtime) use development::development_context_bytes;
+
 pub(in crate::runtime) fn context_bytes(context: &ProductProofContext) -> [u8; 32] {
     let suffix = derivation_index_bytes(&context.suffix);
     let mut input = Vec::with_capacity(9 + context.product_id.len() + suffix.len());