diff --git a/Cargo.toml b/Cargo.toml
index 6e769c19d2a..f1405cf2d56 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -41,7 +41,6 @@ members = [
     "lib/blackbox",
     "lib/blockhold",
     "lib/blockring",
-    "lib/blockring/transport",
     "lib/bootmap",
     "lib/crypto",
     "lib/device-memory",
@@ -90,6 +89,7 @@ members = [
     "sdk/std/copies",
     "sdk/osrelease",
     "sdk/toyos",
+    "sdk/transport",
     "sdk/window",
     "system/acpiserver",
     "system/acpiserver/aml",
diff --git a/build/sdkversion.rs b/build/sdkversion.rs
index 3e7fd470a67..22cb6d2ba0d 100644
--- a/build/sdkversion.rs
+++ b/build/sdkversion.rs
@@ -23,7 +23,7 @@ pub struct Crate {
 pub const PUBLISHED: &[Crate] = &[
     Crate { name: "toyos-abi", dir: "sdk/abi" },
     Crate { name: "toyos-untrusted", dir: "lib/untrusted" },
-    Crate { name: "toyos-transport", dir: "lib/blockring/transport" },
+    Crate { name: "toyos-transport", dir: "sdk/transport" },
     Crate { name: "toyos-keymap", dir: "sdk/keymap" },
     Crate { name: "toyos-font", dir: "sdk/font" },
     Crate { name: "toyos", dir: "sdk/toyos" },
diff --git a/build/sysroot.rs b/build/sysroot.rs
index 8339492a196..4932efe775f 100644
--- a/build/sysroot.rs
+++ b/build/sysroot.rs
@@ -71,7 +71,7 @@ use whole_toolchain::{whole, Whole};
 pub const SYSROOT_SOURCES: [&str; 9] = [
     "sdk/abi/src",
     "sdk/toyos/src",
-    "lib/blockring/transport/src",
+    "sdk/transport/src",
     "lib/untrusted/src",
     "sdk/std",
     "lib/elf/src",
@@ -85,7 +85,7 @@ pub const SYSROOT_SOURCES: [&str; 9] = [
 pub(crate) const SYSROOT_MANIFESTS: [&str; 9] = [
     "sdk/abi/Cargo.toml",
     "sdk/toyos/Cargo.toml",
-    "lib/blockring/transport/Cargo.toml",
+    "sdk/transport/Cargo.toml",
     "lib/untrusted/Cargo.toml",
     "lib/elf/Cargo.toml",
     "sdk/osrelease/Cargo.toml",
@@ -98,7 +98,7 @@ pub(crate) const SYSROOT_MANIFESTS: [&str; 9] = [
 /// lockfile resolves with the fork's own through [`std_patch`]: what of a
 /// worktree can move a freestanding target's dependency versions.
 const STD_MANIFESTS: [&str; 4] =
-    ["sdk/abi/Cargo.toml", "sdk/toyos/Cargo.toml", "lib/blockring/transport/Cargo.toml", "lib/untrusted/Cargo.toml"];
+    ["sdk/abi/Cargo.toml", "sdk/toyos/Cargo.toml", "sdk/transport/Cargo.toml", "lib/untrusted/Cargo.toml"];
 
 /// One of the crates std names by version, in a worktree.
 pub(crate) struct StdCrate {
@@ -1321,7 +1321,7 @@ pub(crate) mod tests {
                 "--config".to_string(),
                 format!("patch.crates-io.toyos.path=\"{at}/sdk/toyos\""),
                 "--config".to_string(),
-                format!("patch.crates-io.toyos-transport.path=\"{at}/lib/blockring/transport\""),
+                format!("patch.crates-io.toyos-transport.path=\"{at}/sdk/transport\""),
                 "--config".to_string(),
                 format!("patch.crates-io.toyos-untrusted.path=\"{at}/lib/untrusted\""),
             ],
diff --git a/build/toolchain.rs b/build/toolchain.rs
index 6be72d48390..39aec9473cc 100644
--- a/build/toolchain.rs
+++ b/build/toolchain.rs
@@ -825,7 +825,7 @@ mod tests {
         let registry = |name: &str, version: &str| {
             format!("/home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/{name}-{version}/src/lib.rs")
         };
-        let rest = format!("{} {}", ours("lib/blockring/transport"), ours("lib/untrusted"));
+        let rest = format!("{} {}", ours("sdk/transport"), ours("lib/untrusted"));
         let built_from = |abi: &str, toyos: &str| {
             fs::write(built.join("dist/libstd.d"), format!("{}/dist/libstd.rlib: {abi} {toyos} {rest}\n", built.display()))
                 .unwrap();
diff --git a/issues/loom-arc-panics-in-its-drop-while-a-failed-model-unwinds.md b/issues/loom-arc-panics-in-its-drop-while-a-failed-model-unwinds.md
index 42b9beec917..e7eae7246fc 100644
--- a/issues/loom-arc-panics-in-its-drop-while-a-failed-model-unwinds.md
+++ b/issues/loom-arc-panics-in-its-drop-while-a-failed-model-unwinds.md
@@ -19,7 +19,7 @@ while `std::thread::panicking()`; its `Arc` does not.
 
 **Evidence** ([ToyOSOrg/evidence `29c8ebcb`, `arc-probe/`](https://github.com/ToyOSOrg/evidence/tree/29c8ebcb04eae318598ff7cb0a045e6e9a1c4f53/arc-probe)):
 at `6d2e78400`, with the stream model in
-`lib/blockring/transport/tests/loom.rs` on `loom::sync::Arc` in place of
+`sdk/transport/tests/loom.rs` on `loom::sync::Arc` in place of
 std's, `cargo test -p toyos-transport --features want-relaxed --test loom --
 a_consumer_that_looked_again_is_rung_for_bytes_it_missed --exact` kills the
 test binary with SIGABRT, `panic in a destructor during cleanup`, through
diff --git a/issues/netstack-moves-every-byte-through-two-kernel-pipes.md b/issues/netstack-moves-every-byte-through-two-kernel-pipes.md
index a6e43f0693c..cfd14216169 100644
--- a/issues/netstack-moves-every-byte-through-two-kernel-pipes.md
+++ b/issues/netstack-moves-every-byte-through-two-kernel-pipes.md
@@ -52,7 +52,7 @@ The design and its roast are PR #863's body.
   `DeviceMemory`, and a receiver judges a lent region through `fstat` before
   it maps it.
 - Stage 2, done (PR #878): a byte ring with untrusted cursors and want words
-  in `toyos-transport` (`lib/blockring/transport`), host-tested and modelled
+  in `toyos-transport` (`sdk/transport`), host-tested and modelled
   in loom.
 - Stage 3, done (PR #905): a TCP stream, connected or accepted, is one
   region whose two rings are [tcp]'s buffers and the connection it was opened
diff --git a/issues/the-transport-heads-orderings-have-no-oracle.md b/issues/the-transport-heads-orderings-have-no-oracle.md
index 38878d463f1..0bd386bd3b2 100644
--- a/issues/the-transport-heads-orderings-have-no-oracle.md
+++ b/issues/the-transport-heads-orderings-have-no-oracle.md
@@ -8,7 +8,7 @@ opened: 2026-09-27
 
 A consumer stores its head `Release` after it has loaded the entries below it,
 and a producer loads the head `Acquire` before it writes over them
-(`lib/blockring/transport/src/queue.rs`, `Consumer::release` and `Producer::space`).
+(`sdk/transport/src/queue.rs`, `Consumer::release` and `Producer::space`).
 No test reds if either is `Relaxed`: what the pair forbids is load buffering —
 a consumer's load of an entry reading the producer's later overwrite — which
 loom does not model, and every other test runs both ends on one thread. The
diff --git a/lib/blockring/Cargo.toml b/lib/blockring/Cargo.toml
index 1a49bbd54d8..f0f65fa972c 100644
--- a/lib/blockring/Cargo.toml
+++ b/lib/blockring/Cargo.toml
@@ -40,7 +40,7 @@ mutate-no-reissue-after-loss = []
 # it today.
 toyos-blockhold = { path = "../blockhold" }
 # The rings on the session page.
-toyos-transport = { path = "transport" }
+toyos-transport = { path = "../../sdk/transport" }
 
 [lints.rust]
 warnings = "deny"
diff --git a/sdk/toyos/Cargo.toml b/sdk/toyos/Cargo.toml
index 57e4ad42683..ca94156bad5 100644
--- a/sdk/toyos/Cargo.toml
+++ b/sdk/toyos/Cargo.toml
@@ -29,4 +29,4 @@ unexpected_cfgs = { level = "warn", check-cfg = ['cfg(target_os, values("toyos")
 [dependencies]
 core = { version = "1.0.0", optional = true, package = "rustc-std-workspace-core" }
 toyos-abi = { path = "../abi", default-features = false }
-toyos-transport = { path = "../../lib/blockring/transport" }
+toyos-transport = { path = "../transport" }
diff --git a/lib/blockring/transport/Cargo.toml b/sdk/transport/Cargo.toml
similarity index 98%
rename from lib/blockring/transport/Cargo.toml
rename to sdk/transport/Cargo.toml
index 5f218ba0d09..3665df21744 100644
--- a/lib/blockring/transport/Cargo.toml
+++ b/sdk/transport/Cargo.toml
@@ -61,7 +61,7 @@ head-only = []
 
 [dependencies]
 core = { version = "1.0.0", optional = true, package = "rustc-std-workspace-core" }
-toyos-untrusted = { path = "../../untrusted" }
+toyos-untrusted = { path = "../../lib/untrusted" }
 
 [dev-dependencies]
 loom = "0.7"
diff --git a/lib/blockring/transport/src/arena.rs b/sdk/transport/src/arena.rs
similarity index 100%
rename from lib/blockring/transport/src/arena.rs
rename to sdk/transport/src/arena.rs
diff --git a/lib/blockring/transport/src/inflight.rs b/sdk/transport/src/inflight.rs
similarity index 100%
rename from lib/blockring/transport/src/inflight.rs
rename to sdk/transport/src/inflight.rs
diff --git a/lib/blockring/transport/src/lib.rs b/sdk/transport/src/lib.rs
similarity index 100%
rename from lib/blockring/transport/src/lib.rs
rename to sdk/transport/src/lib.rs
diff --git a/lib/blockring/transport/src/queue.rs b/sdk/transport/src/queue.rs
similarity index 100%
rename from lib/blockring/transport/src/queue.rs
rename to sdk/transport/src/queue.rs
diff --git a/lib/blockring/transport/src/session.rs b/sdk/transport/src/session.rs
similarity index 100%
rename from lib/blockring/transport/src/session.rs
rename to sdk/transport/src/session.rs
diff --git a/lib/blockring/transport/src/stream.rs b/sdk/transport/src/stream.rs
similarity index 100%
rename from lib/blockring/transport/src/stream.rs
rename to sdk/transport/src/stream.rs
diff --git a/lib/blockring/transport/tests/loom.rs b/sdk/transport/tests/loom.rs
similarity index 100%
rename from lib/blockring/transport/tests/loom.rs
rename to sdk/transport/tests/loom.rs
diff --git a/system/netstack/Cargo.toml b/system/netstack/Cargo.toml
index 55c5d1197b5..70b3399235e 100644
--- a/system/netstack/Cargo.toml
+++ b/system/netstack/Cargo.toml
@@ -24,7 +24,7 @@ toyos-net-shard = { path = "shard" }
 toyos-net-tcp = { path = "shard/tcp" }
 toyos-net-udp = { path = "udp" }
 toyos-net-wire = { path = "wire" }
-toyos-transport = { path = "../../lib/blockring/transport" }
+toyos-transport = { path = "../../sdk/transport" }
 
 [dev-dependencies]
 toyos-pci-claim = { path = "../../lib/pci-claim", features = ["host-grant"] }
diff --git a/system/netstack/node/Cargo.toml b/system/netstack/node/Cargo.toml
index 398973ee91b..bbb656a926a 100644
--- a/system/netstack/node/Cargo.toml
+++ b/system/netstack/node/Cargo.toml
@@ -20,7 +20,7 @@ toyos-net-udp = { path = "../udp" }
 toyos-net-wire = { path = "../wire" }
 # The stream protocol's one declaration, the region's layout, and the session's server end.
 toyos = { path = "../../../sdk/toyos" }
-toyos-transport = { path = "../../../lib/blockring/transport" }
+toyos-transport = { path = "../../../sdk/transport" }
 
 [dev-dependencies]
 # The outside reader of every frame the node emits: a published Ethernet, ARP,