diff --git a/videre/crates/videre-host/src/bindings.rs b/videre/crates/videre-host/src/bindings.rs
index 06e2b887..28f35449 100644
--- a/videre/crates/videre-host/src/bindings.rs
+++ b/videre/crates/videre-host/src/bindings.rs
@@ -19,7 +19,7 @@ mod venue_adapter {
         path: [
             "../../wit/videre-value-flow",
             "../../wit/videre-types",
-            "../../wit/nexum-host",
+            "../../wit/deps/nexum-host",
             "../../wit/videre-venue",
         ],
         world: "videre:venue/venue-adapter",
@@ -54,7 +54,7 @@ mod client_host {
         path: [
             "../../wit/videre-value-flow",
             "../../wit/videre-types",
-            "../../wit/nexum-host",
+            "../../wit/deps/nexum-host",
             "../../wit/videre-venue",
         ],
         imports: { default: async },
@@ -171,7 +171,7 @@ mod client_smoke {
         path: [
             "../../wit/videre-value-flow",
             "../../wit/videre-types",
-            "../../wit/nexum-host",
+            "../../wit/deps/nexum-host",
             "../../wit/videre-venue",
         ],
     });
diff --git a/videre/crates/videre-sdk/src/bindings.rs b/videre/crates/videre-sdk/src/bindings.rs
index 9f57dde8..77a561a4 100644
--- a/videre/crates/videre-sdk/src/bindings.rs
+++ b/videre/crates/videre-sdk/src/bindings.rs
@@ -34,7 +34,7 @@ world sdk-imports {
     path: [
         "../../wit/videre-value-flow",
         "../../wit/videre-types",
-        "../../wit/nexum-host",
+        "../../wit/deps/nexum-host",
         "../../wit/videre-venue",
     ],
     world: "videre:sdk-shims/sdk-imports",
diff --git a/videre/wit/deps.lock b/videre/wit/deps.lock
new file mode 100644
index 00000000..c9d6d0ce
--- /dev/null
+++ b/videre/wit/deps.lock
@@ -0,0 +1,5 @@
+[nexum-host]
+url = "https://github.com/nullislabs/nexum-runtime/archive/refs/tags/nexum-host-v0.1.0.tar.gz"
+prefix = "nexum-runtime-nexum-host-v0.1.0/wit/nexum-host"
+sha256 = "c0a31ec3ff63a2b903daff7de9658d5caf9122737e388766fd6c380718e05587"
+sha512 = "bcdba1c0e1c70c0eb42eb04591b0c45f923efb8de631d2acfbf2c9fecf455d5104af7a75513ac4cfa500a91700fbd8e82070d395939e5dfb50a190a6bb4a0413"
diff --git a/videre/wit/deps.toml b/videre/wit/deps.toml
new file mode 100644
index 00000000..eed3dd05
--- /dev/null
+++ b/videre/wit/deps.toml
@@ -0,0 +1,8 @@
+# Cross-repo WIT pins, vendored under wit/deps and verified against
+# deps.lock by `wit-deps`. Pins are exact git tags of the owning repo;
+# they converge to wkg/OCI (ghcr.io/nullislabs) with per-package semver
+# once the packages are published.
+
+[nexum-host]
+url = "https://github.com/nullislabs/nexum-runtime/archive/refs/tags/nexum-host-v0.1.0.tar.gz"
+prefix = "nexum-runtime-nexum-host-v0.1.0/wit/nexum-host"
diff --git a/videre/wit/deps/nexum-host/chain.wit b/videre/wit/deps/nexum-host/chain.wit
new file mode 100644
index 00000000..1d812dc6
--- /dev/null
+++ b/videre/wit/deps/nexum-host/chain.wit
@@ -0,0 +1,60 @@
+package nexum:host@0.1.0;
+
+interface chain {
+    use types.{chain-id, fault};
+
+    /// A JSON-RPC error response from the upstream node. `code` is the
+    /// node-reported numeric (typically `-32000` for an `eth_call`
+    /// revert). `data` is the decoded `error.data` payload: the host
+    /// hex-decodes the upstream JSON string once, so a guest receives
+    /// the raw abi-encoded revert bytes without any string handling.
+    record rpc-error {
+        code: s32,
+        message: string,
+        data: option<list<u8>>,
+    }
+
+    /// Failure of a chain call: either a shared host `fault` (transport
+    /// down, timed out, denied, ...) or a structured JSON-RPC error
+    /// carrying the node code and any decoded revert payload.
+    variant chain-error {
+        fault(fault),
+        rpc(rpc-error),
+    }
+
+    /// A single JSON-RPC request to be executed as part of a batch.
+    record rpc-request {
+        method: string,
+        params: string,
+    }
+
+    /// Result of a single request inside a batch. Each entry is independent;
+    /// one failing call does not abort the others.
+    variant rpc-result {
+        ok(string),
+        err(chain-error),
+    }
+
+    /// Execute a JSON-RPC request against the specified chain.
+    ///
+    /// The host routes to its configured provider for the given chain,
+    /// applying whatever middleware is appropriate for the platform
+    /// (timeout, retry, rate-limit, fallback on server; simple HTTP
+    /// on mobile; window.ethereum or injected provider in WebView).
+    ///
+    /// `method` includes the namespace prefix (e.g. "eth_call"). Each
+    /// host enforces its own permitted method surface; the reference
+    /// server host forwards only a read-only set and refuses signing
+    /// or mutating methods with a `denied` fault before they reach the
+    /// provider. `params` and the success value are JSON-encoded
+    /// strings.
+    request: func(chain-id: chain-id, method: string, params: string)
+        -> result<string, chain-error>;
+
+    /// Execute several JSON-RPC requests against the same chain in a single
+    /// round trip where the host transport supports it. Hosts that cannot
+    /// batch natively MUST fall back to sequential `request` calls. The
+    /// returned list is the same length as `requests` and in the same order.
+    request-batch: func(chain-id: chain-id, requests: list<rpc-request>)
+        -> result<list<rpc-result>, chain-error>;
+}
diff --git a/videre/wit/deps/nexum-host/event-module.wit b/videre/wit/deps/nexum-host/event-module.wit
new file mode 100644
index 00000000..277134a9
--- /dev/null
+++ b/videre/wit/deps/nexum-host/event-module.wit
@@ -0,0 +1,24 @@
+package nexum:host@0.1.0;
+
+/// Event-driven module — automation, background processing.
+/// No UI capabilities. Runs on any conforming host.
+world event-module {
+    use types.{config, event, fault};
+
+    // Six core primitives (always provided by a conforming host).
+    import chain;
+    import identity;
+    import local-store;
+    import remote-store;
+    import messaging;
+    import logging;
+
+    // Time, randomness, and outbound HTTP are WASI concerns, not
+    // nexum:host interfaces: wasi:clocks and wasi:random are linked
+    // into every module store, and hosts link
+    // wasi:http/outgoing-handler, gated per-module by the
+    // `[capabilities.http].allow` allowlist in module.toml.
+
+    export init: func(config: config) -> result<_, fault>;
+    export on-event: func(event: event) -> result<_, fault>;
+}
diff --git a/videre/wit/deps/nexum-host/identity.wit b/videre/wit/deps/nexum-host/identity.wit
new file mode 100644
index 00000000..2e82c9fe
--- /dev/null
+++ b/videre/wit/deps/nexum-host/identity.wit
@@ -0,0 +1,24 @@
+package nexum:host@0.1.0;
+
+/// Identity / signing capability.
+///
+/// 0.2 ships a single, minimal interface. A future release (0.4+) is
+/// expected to split this into `identity-read` and `identity-sign` and to
+/// introduce a richer `signing-result` variant; for 0.2 the simple shape is
+/// sufficient because user rejection can already be expressed via
+/// `fault.denied`.
+interface identity {
+    use types.{fault};
+
+    /// Return the list of account addresses (20-byte EVM addresses) the host
+    /// is willing to sign for. Empty list means no signing capability.
+    accounts: func() -> result<list<list<u8>>, fault>;
+
+    /// Sign an arbitrary message with personal_sign semantics (prepends the
+    /// "\x19Ethereum Signed Message:\n" prefix). Returns a 65-byte signature.
+    sign: func(account: list<u8>, message: list<u8>) -> result<list<u8>, fault>;
+
+    /// Sign EIP-712 typed data. `typed-data` is a JSON-encoded EIP-712 payload.
+    /// Returns a 65-byte signature.
+    sign-typed-data: func(account: list<u8>, typed-data: string) -> result<list<u8>, fault>;
+}
diff --git a/videre/wit/deps/nexum-host/local-store.wit b/videre/wit/deps/nexum-host/local-store.wit
new file mode 100644
index 00000000..8521b37a
--- /dev/null
+++ b/videre/wit/deps/nexum-host/local-store.wit
@@ -0,0 +1,29 @@
+package nexum:host@0.1.0;
+
+interface local-store {
+    use types.{fault};
+
+    /// Get a value by key. Returns none if the key does not exist.
+    get: func(key: string) -> result<option<list<u8>>, fault>;
+
+    /// Set a key-value pair. Overwrites any existing value.
+    /// The host may enforce a size quota; if exceeded, returns err.
+    set: func(key: string, value: list<u8>) -> result<_, fault>;
+
+    /// Delete a key. No-op if the key does not exist.
+    delete: func(key: string) -> result<_, fault>;
+
+    /// List all keys matching a prefix. Empty prefix returns all keys.
+    list-keys: func(prefix: string) -> result<list<string>, fault>;
+
+    /// Whether the key exists, without transferring the value.
+    contains: func(key: string) -> result<bool, fault>;
+
+    /// Value byte length, none if the key is absent, without
+    /// transferring the value. On some backends this may be a scan.
+    len: func(key: string) -> result<option<u64>, fault>;
+
+    /// Number of keys matching a prefix, without materialising the key
+    /// list. On some backends this may be a scan.
+    count: func(prefix: string) -> result<u64, fault>;
+}
diff --git a/videre/wit/deps/nexum-host/logging.wit b/videre/wit/deps/nexum-host/logging.wit
new file mode 100644
index 00000000..8cd98140
--- /dev/null
+++ b/videre/wit/deps/nexum-host/logging.wit
@@ -0,0 +1,15 @@
+package nexum:host@0.1.0;
+
+interface logging {
+    enum level {
+        trace,
+        debug,
+        info,
+        warn,
+        error,
+    }
+
+    /// Emit a structured log message.
+    /// The host decides how to handle it (stdout, file, discard).
+    log: func(level: level, message: string);
+}
diff --git a/videre/wit/deps/nexum-host/messaging.wit b/videre/wit/deps/nexum-host/messaging.wit
new file mode 100644
index 00000000..30777ca7
--- /dev/null
+++ b/videre/wit/deps/nexum-host/messaging.wit
@@ -0,0 +1,19 @@
+package nexum:host@0.1.0;
+
+interface messaging {
+    use types.{fault, message};
+
+    /// Publish a message to a content topic.
+    ///
+    /// Content topics follow the format: /<app>/<version>/<topic>/<encoding>
+    /// e.g. "/nexum/1/twap-updates/proto"
+    publish: func(content-topic: string, payload: list<u8>) -> result<_, fault>;
+
+    /// Query historical messages from the Waku store protocol.
+    query: func(
+        content-topic: string,
+        start-time: option<u64>,
+        end-time: option<u64>,
+        limit: option<u32>,
+    ) -> result<list<message>, fault>;
+}
diff --git a/videre/wit/deps/nexum-host/query-module.wit b/videre/wit/deps/nexum-host/query-module.wit
new file mode 100644
index 00000000..ffb29b87
--- /dev/null
+++ b/videre/wit/deps/nexum-host/query-module.wit
@@ -0,0 +1,25 @@
+package nexum:host@0.1.0;
+
+/// Query module — synchronous, side-effect-free evaluation.
+///
+/// EXPERIMENTAL (0.2): the shape of this world is provisional and may
+/// change in a future minor release without a major bump. Hosts and SDKs
+/// should expect breakage here until the world is stabilised.
+///
+/// A query module exposes a single pure `evaluate` entry point. It is given
+/// read-only access to the local store (for cached/derived state) and to
+/// logging; everything else (chain access, network, messaging, signing) is
+/// deliberately excluded so the host can run queries inside a tight
+/// deterministic sandbox.
+world query-module {
+    use types.{config, fault};
+
+    import local-store;
+    import logging;
+
+    export init: func(config: config) -> result<_, fault>;
+
+    /// Evaluate the query. `input` and the returned bytes are opaque to the
+    /// host; the module and its caller agree on the encoding.
+    export evaluate: func(input: list<u8>) -> result<list<u8>, fault>;
+}
diff --git a/videre/wit/deps/nexum-host/remote-store.wit b/videre/wit/deps/nexum-host/remote-store.wit
new file mode 100644
index 00000000..39b36bae
--- /dev/null
+++ b/videre/wit/deps/nexum-host/remote-store.wit
@@ -0,0 +1,33 @@
+package nexum:host@0.1.0;
+
+interface remote-store {
+    use types.{fault};
+
+    /// Upload raw data to the decentralised store.
+    /// Returns the 32-byte content reference (Swarm address).
+    upload: func(data: list<u8>) -> result<list<u8>, fault>;
+
+    /// Download raw data by 32-byte content reference.
+    download: func(reference: list<u8>) -> result<list<u8>, fault>;
+
+    /// Read the latest value from a mutable feed.
+    ///
+    /// Feeds are mutable pointers: (owner, topic) -> latest chunk.
+    /// `owner`: 20-byte Ethereum address of the feed owner.
+    /// `topic`: 32-byte topic hash.
+    read-feed: func(
+        owner: list<u8>,
+        topic: list<u8>,
+    ) -> result<option<list<u8>>, fault>;
+
+    /// Update a mutable feed with new data.
+    ///
+    /// The host signs the feed update with its configured identity.
+    /// `topic`: 32-byte topic hash.
+    /// `data`: the payload to publish.
+    /// Returns the 32-byte reference of the new chunk.
+    write-feed: func(
+        topic: list<u8>,
+        data: list<u8>,
+    ) -> result<list<u8>, fault>;
+}
diff --git a/videre/wit/deps/nexum-host/types.wit b/videre/wit/deps/nexum-host/types.wit
new file mode 100644
index 00000000..8e834263
--- /dev/null
+++ b/videre/wit/deps/nexum-host/types.wit
@@ -0,0 +1,106 @@
+package nexum:host@0.1.0;
+
+/// Common types shared across all runtime interfaces.
+///
+/// All `u64` timestamps in this package are milliseconds since the Unix
+/// epoch, UTC.
+interface types {
+    type chain-id = u64;
+
+    record block {
+        chain-id: chain-id,
+        number: u64,
+        hash: list<u8>,
+        timestamp: u64,
+    }
+
+    /// One decoded log, mirroring the RPC `eth_getLogs` shape field for
+    /// field so the guest can rebuild the native alloy log losslessly.
+    /// Fixed-width byte fields are carried raw: `address` is 20 bytes,
+    /// each topic and hash is 32. The block-scoped fields are absent on a
+    /// pending log (mined logs carry them all).
+    record chain-log {
+        address: list<u8>,
+        topics: list<list<u8>>,
+        data: list<u8>,
+        block-hash: option<list<u8>>,
+        block-number: option<u64>,
+        block-timestamp: option<u64>,
+        transaction-hash: option<list<u8>>,
+        transaction-index: option<u64>,
+        log-index: option<u64>,
+        removed: bool,
+    }
+
+    /// A batch of logs delivered from one subscription. The alloy log type
+    /// carries no chain id, so it sits here once: every log in a delivery
+    /// shares the chain of the subscription that produced it.
+    record chain-logs {
+        chain-id: chain-id,
+        logs: list<chain-log>,
+    }
+
+    /// A message delivered over the messaging interface. Defined here (rather
+    /// than only in `messaging.wit`) so the `event` variant can reference it
+    /// without a cross-interface use clause.
+    record message {
+        content-topic: string,
+        payload: list<u8>,
+        timestamp: u64,
+        /// Optional sender identity (protocol-dependent).
+        sender: option<list<u8>>,
+    }
+
+    /// Fired by the host on a configured cadence. `fired-at` is the host's
+    /// wall-clock time (ms since Unix epoch, UTC) at which the tick was
+    /// generated.
+    record tick {
+        fired-at: u64,
+    }
+
+    /// A host-observed status transition for a previously submitted
+    /// intent. Transport-blind: the subscriber sees only where the
+    /// intent is in its life, never how the host learnt it.
+    record intent-status-update {
+        /// Venue id the receipt was issued by.
+        venue: string,
+        /// The venue-scoped intent identifier, opaque to the host.
+        receipt: list<u8>,
+        /// Opaque versioned status body: a leading u8 version tag,
+        /// then that version's borsh payload (v1: lifecycle status,
+        /// optional settlement proof, optional failure reason). An
+        /// unknown tag is a decode error and the body is never empty.
+        /// The host never inspects it.
+        status: list<u8>,
+    }
+
+    variant event {
+        block(block),
+        chain-logs(chain-logs),
+        tick(tick),
+        message(message),
+        intent-status(intent-status-update),
+    }
+
+    /// Opaque config from module.toml [config] section.
+    type config = list<tuple<string, string>>;
+
+    /// The cross-domain failure vocabulary richer interfaces embed as a
+    /// case. Each payload-bearing case carries a human-readable detail;
+    /// `rate-limited` carries structured backoff guidance instead.
+    variant fault {
+        unsupported(string),
+        unavailable(string),
+        denied(string),
+        rate-limited(rate-limit),
+        timeout,
+        invalid-input(string),
+        internal(string),
+    }
+
+    /// Backoff guidance for a `fault.rate-limited`. `retry-after-ms` is
+    /// the host's suggested wait before retrying, when known.
+    record rate-limit {
+        retry-after-ms: option<u64>,
+    }
+}
diff --git a/videre/wit/nexum-host b/videre/wit/nexum-host
deleted file mode 120000
index 9b9eefce..00000000
--- a/videre/wit/nexum-host
+++ /dev/null
@@ -1 +0,0 @@
-../../nexum/wit/nexum-host
\ No newline at end of file