diff --git a/crates/proton-drive-sdk/src/client.rs b/crates/proton-drive-sdk/src/client.rs
index 70d2d1c..1ef9167 100644
--- a/crates/proton-drive-sdk/src/client.rs
+++ b/crates/proton-drive-sdk/src/client.rs
@@ -1188,8 +1188,14 @@ impl ProtonDriveClient {
         let request = MoveLinkRequest {
             parent_link_id: new_parent.link_id.clone(),
             passphrase: parts.passphrase,
-            // The rewrap preserves the plaintext, so the signature is unchanged.
-            passphrase_signature: link.passphrase_signature,
+            // The rewrap preserves the plaintext, so the existing detached
+            // signature stays valid and is not re-sent (C# `MoveSingleAsync`
+            // sends `PassphraseSignature = null` for non-anonymous nodes; only
+            // an anonymous move re-signs). Passing the link's own value back is
+            // wrong: the API returns it as an empty string for these nodes, and
+            // a serialized empty `NodePassphraseSignature` is rejected 400
+            // "should not be empty" — the batch path already hardcodes `None`.
+            passphrase_signature: None,
             name: parts.encrypted_name,
             name_signature_email: email,
             name_hash: parts.name_hash,
diff --git a/crates/proton-drive-sdk/tests/common/mod.rs b/crates/proton-drive-sdk/tests/common/mod.rs
index e9f30f4..19135d1 100644
--- a/crates/proton-drive-sdk/tests/common/mod.rs
+++ b/crates/proton-drive-sdk/tests/common/mod.rs
@@ -31,14 +31,27 @@ pub struct LiveClient {
     pub _session: ProtonApiSession,
 }
 
-/// Build an authenticated `ProtonDriveClient`, or `None` when credentials are
-/// not configured (skip, don't fail).
+/// Process-global authenticated client, built once and shared by every test in
+/// this binary. Proton anti-abuse throttles repeated SRP logins (and each login
+/// burns a TOTP window), so a fresh login per test trips
+/// `IncorrectLoginCredentials` after a handful. One login for the whole suite
+/// sidesteps both. `None` = credentials absent (skip cleanly).
+static SHARED: tokio::sync::OnceCell<Option<LiveClient>> = tokio::sync::OnceCell::const_new();
+
+/// The shared authenticated `ProtonDriveClient`, or `None` when credentials are
+/// not configured (skip, don't fail). Logs in on first call; reused thereafter.
 ///
 /// Call from a test like:
 /// ```ignore
 /// let Some(live) = common::live_client().await else { return };
+/// let client = &live.client;
 /// ```
-pub async fn live_client() -> Option<LiveClient> {
+pub async fn live_client() -> Option<&'static LiveClient> {
+    SHARED.get_or_init(build_live_client).await.as_ref()
+}
+
+/// Perform the one-time SRP + 2FA login and build the client.
+async fn build_live_client() -> Option<LiveClient> {
     let (username, password) = match read_dotenv() {
         Ok(creds) => creds,
         Err(e) => {
@@ -61,7 +74,7 @@ pub async fn live_client() -> Option<LiveClient> {
         .expect("SRP login failed");
 
     if session.is_waiting_for_second_factor() {
-        let code = totp_now(&totp_secret).expect("TOTP compute failed");
+        let code = totp_fresh(&totp_secret).expect("TOTP compute failed");
         session
             .apply_second_factor_code(&code)
             .await
@@ -128,10 +141,36 @@ fn read_totp_secret() -> Option<String> {
     None
 }
 
-/// RFC 6238 TOTP (SHA-1, 6 digits, 30s step) for the current time.
-fn totp_now(secret_b32: &str) -> Result<String, Box<dyn std::error::Error>> {
+/// Last TOTP window (30s counter) submitted by *any* login in this process.
+///
+/// Proton rejects a TOTP code re-submitted within its 30s validity window, so
+/// back-to-back logins (one per test) must each land on a distinct window.
+static LAST_TOTP_COUNTER: std::sync::Mutex<u64> = std::sync::Mutex::new(0);
+
+/// A TOTP code guaranteed not to reuse a window already consumed by an earlier
+/// login in this process. Blocks until the next 30s boundary when the current
+/// window was already used (so serial `--ignored` runs don't trip on code
+/// reuse). Uses a blocking sleep — fine for the single-threaded test harness.
+fn totp_fresh(secret_b32: &str) -> Result<String, Box<dyn std::error::Error>> {
+    loop {
+        let now = SystemTime::now().duration_since(UNIX_EPOCH)?.as_secs();
+        let counter = now / 30;
+        {
+            let mut last = LAST_TOTP_COUNTER.lock().unwrap();
+            if counter > *last {
+                *last = counter;
+                return totp_at(secret_b32, counter);
+            }
+        }
+        let wait = 30 - (now % 30) + 1;
+        eprintln!("[2fa] TOTP window already used; waiting {wait}s for a fresh code");
+        std::thread::sleep(std::time::Duration::from_secs(wait));
+    }
+}
+
+/// RFC 6238 TOTP (SHA-1, 6 digits, 30s step) at a specific 30s counter.
+fn totp_at(secret_b32: &str, counter: u64) -> Result<String, Box<dyn std::error::Error>> {
     let key = base32_decode(secret_b32)?;
-    let counter = SystemTime::now().duration_since(UNIX_EPOCH)?.as_secs() / 30;
 
     let mut mac = Hmac::<Sha1>::new_from_slice(&key)?;
     mac.update(&counter.to_be_bytes());
diff --git a/crates/proton-drive-sdk/tests/live_drive_ops.rs b/crates/proton-drive-sdk/tests/live_drive_ops.rs
new file mode 100644
index 0000000..9a2d5ad
--- /dev/null
+++ b/crates/proton-drive-sdk/tests/live_drive_ops.rs
@@ -0,0 +1,306 @@
+//! Live integration: folder operations, node moves, and signature
+//! verification against a real Proton account.
+//!
+//! Skipped by default. Run against the test account with:
+//!   cargo test -p proton-drive-sdk --test live_drive_ops -- --ignored --nocapture
+//!
+//! Each test cleans up after itself (trash + delete-from-trash) so the account
+//! stays reusable across runs.
+
+mod common;
+
+use proton_drive_sdk::proton_sdk::crypto::VerificationStatus;
+use proton_drive_sdk::{Node, NodeKind};
+use proton_sdk::ids::NodeUid;
+
+/// Trash then permanently delete the given nodes; best-effort, logs on failure.
+async fn cleanup(client: &proton_drive_sdk::ProtonDriveClient, uids: &[NodeUid]) {
+    if let Err(e) = client.trash_nodes(uids).await {
+        eprintln!("[cleanup] trash failed: {e}");
+        return;
+    }
+    if let Err(e) = client.delete_nodes(uids).await {
+        eprintln!("[cleanup] delete failed: {e}");
+    }
+}
+
+/// Fetch a node that must exist, panicking with context otherwise.
+async fn get(client: &proton_drive_sdk::ProtonDriveClient, uid: &NodeUid, what: &str) -> Node {
+    client
+        .get_node(uid)
+        .await
+        .unwrap_or_else(|e| panic!("get_node({what}) errored: {e}"))
+        .unwrap_or_else(|| panic!("get_node({what}) returned None"))
+}
+
+// ---------------------------------------------------------------------------
+// Folder operations
+// ---------------------------------------------------------------------------
+
+/// create → rename → trash → restore → delete, asserting state at each step.
+#[tokio::test]
+#[ignore = "live: needs test-account credentials"]
+async fn folder_create_rename_trash_restore() {
+    let Some(live) = common::live_client().await else {
+        return;
+    };
+    let client = &live.client;
+
+    let root = client.get_my_files_folder().await.expect("get my-files root");
+
+    // create
+    let name = format!("folder-ops-{}", common::unique_suffix());
+    let uid = client
+        .create_folder(&root.uid, &name, None)
+        .await
+        .expect("create_folder");
+
+    let node = get(&client, &uid, "after create").await;
+    assert!(matches!(node.kind, NodeKind::Folder), "must be a folder");
+    assert_eq!(node.name, name, "name must round-trip");
+    assert_eq!(
+        node.parent_uid.as_ref(),
+        Some(&root.uid),
+        "parent must be root"
+    );
+
+    // rename
+    let renamed = format!("{name}-renamed");
+    client
+        .rename_node(&uid, &renamed, None)
+        .await
+        .expect("rename_node");
+    let node = get(&client, &uid, "after rename").await;
+    assert_eq!(node.name, renamed, "rename must take effect");
+
+    // trash
+    client.trash_nodes(&[uid.clone()]).await.expect("trash");
+    let node = get(&client, &uid, "after trash").await;
+    assert!(node.trashed, "node must report trashed");
+    let trash = client
+        .enumerate_trash_node_uids()
+        .await
+        .expect("enumerate trash");
+    assert!(trash.contains(&uid), "trash listing must include the node");
+
+    // restore
+    client.restore_nodes(&[uid.clone()]).await.expect("restore");
+    let node = get(&client, &uid, "after restore").await;
+    assert!(!node.trashed, "node must no longer be trashed");
+
+    // delete (final)
+    cleanup(&client, &[uid]).await;
+}
+
+/// empty_trash removes a trashed node from the trash listing.
+#[tokio::test]
+#[ignore = "live: needs test-account credentials"]
+async fn folder_empty_trash() {
+    let Some(live) = common::live_client().await else {
+        return;
+    };
+    let client = &live.client;
+
+    let root = client.get_my_files_folder().await.expect("get my-files root");
+
+    let name = format!("empty-trash-{}", common::unique_suffix());
+    let uid = client
+        .create_folder(&root.uid, &name, None)
+        .await
+        .expect("create_folder");
+
+    client.trash_nodes(&[uid.clone()]).await.expect("trash");
+    assert!(
+        client
+            .enumerate_trash_node_uids()
+            .await
+            .expect("enumerate trash")
+            .contains(&uid),
+        "node must be in trash before empty"
+    );
+
+    client.empty_trash().await.expect("empty_trash");
+
+    assert!(
+        !client
+            .enumerate_trash_node_uids()
+            .await
+            .expect("enumerate trash")
+            .contains(&uid),
+        "node must be gone from trash after empty_trash"
+    );
+}
+
+// ---------------------------------------------------------------------------
+// Move
+// ---------------------------------------------------------------------------
+
+/// Single move: a child folder relocates from parent A to parent B.
+#[tokio::test]
+#[ignore = "live: needs test-account credentials"]
+async fn move_node_single() {
+    let Some(live) = common::live_client().await else {
+        return;
+    };
+    let client = &live.client;
+
+    let root = client.get_my_files_folder().await.expect("get my-files root");
+    let suffix = common::unique_suffix();
+
+    let a = client
+        .create_folder(&root.uid, &format!("move-src-{suffix}"), None)
+        .await
+        .expect("create A");
+    let b = client
+        .create_folder(&root.uid, &format!("move-dst-{suffix}"), None)
+        .await
+        .expect("create B");
+    let child = client
+        .create_folder(&a, &format!("move-child-{suffix}"), None)
+        .await
+        .expect("create child in A");
+
+    // Precondition: child parented to A.
+    assert_eq!(
+        get(&client, &child, "before move").await.parent_uid.as_ref(),
+        Some(&a),
+        "child must start under A"
+    );
+
+    client.move_node(&child, &b).await.expect("move_node");
+
+    assert_eq!(
+        get(&client, &child, "after move").await.parent_uid.as_ref(),
+        Some(&b),
+        "child must be reparented to B"
+    );
+
+    cleanup(&client, &[child, a, b]).await;
+}
+
+/// Batch move: two children relocate to a destination folder in one call.
+#[tokio::test]
+#[ignore = "live: needs test-account credentials"]
+async fn move_nodes_batch() {
+    let Some(live) = common::live_client().await else {
+        return;
+    };
+    let client = &live.client;
+
+    let root = client.get_my_files_folder().await.expect("get my-files root");
+    let suffix = common::unique_suffix();
+
+    let dst = client
+        .create_folder(&root.uid, &format!("batch-dst-{suffix}"), None)
+        .await
+        .expect("create dst");
+    let c1 = client
+        .create_folder(&root.uid, &format!("batch-c1-{suffix}"), None)
+        .await
+        .expect("create c1");
+    let c2 = client
+        .create_folder(&root.uid, &format!("batch-c2-{suffix}"), None)
+        .await
+        .expect("create c2");
+
+    client
+        .move_nodes(&[c1.clone(), c2.clone()], &dst)
+        .await
+        .expect("move_nodes");
+
+    assert_eq!(
+        get(&client, &c1, "c1 after move").await.parent_uid.as_ref(),
+        Some(&dst),
+        "c1 must be under dst"
+    );
+    assert_eq!(
+        get(&client, &c2, "c2 after move").await.parent_uid.as_ref(),
+        Some(&dst),
+        "c2 must be under dst"
+    );
+
+    cleanup(&client, &[c1, c2, dst]).await;
+}
+
+// ---------------------------------------------------------------------------
+// Signature verification
+// ---------------------------------------------------------------------------
+
+/// A self-uploaded file must verify cleanly: this exercises the live
+/// `core/v4/keys/all` author-key resolution path (the offline tests sign with
+/// in-process keys and never prove the remote lookup works).
+#[tokio::test]
+#[ignore = "live: needs test-account credentials"]
+async fn verification_file_fully_verified() {
+    let Some(live) = common::live_client().await else {
+        return;
+    };
+    let client = &live.client;
+
+    let root = client.get_my_files_folder().await.expect("get my-files root");
+
+    let name = format!("verify-{}.txt", common::unique_suffix());
+    let payload = b"verification probe payload".to_vec();
+    let uid = client
+        .upload_file(&root.uid, &name, "text/plain", &payload)
+        .await
+        .expect("upload_file");
+
+    let node = get(&client, &uid, "uploaded file").await;
+    let v = node.verification;
+
+    // Name is inline-signed to the parent by our address key; an `Ok` here
+    // proves the author email resolved to a usable verification key remotely.
+    assert_eq!(
+        v.name,
+        VerificationStatus::Ok,
+        "name signature must verify against the resolved author key"
+    );
+    assert_eq!(
+        v.passphrase,
+        VerificationStatus::Ok,
+        "node passphrase signature must verify"
+    );
+    assert_eq!(
+        v.content_key,
+        Some(VerificationStatus::Ok),
+        "content-key signature (node-key signer) must verify"
+    );
+    assert!(
+        v.is_fully_verified(),
+        "no signature may be NoVerifier/Failed: {v:?}"
+    );
+
+    cleanup(&client, &[uid]).await;
+}
+
+/// A created folder must verify cleanly (name + passphrase signed; no
+/// content-key / xattr for a plain folder).
+#[tokio::test]
+#[ignore = "live: needs test-account credentials"]
+async fn verification_folder_fully_verified() {
+    let Some(live) = common::live_client().await else {
+        return;
+    };
+    let client = &live.client;
+
+    let root = client.get_my_files_folder().await.expect("get my-files root");
+
+    let name = format!("verify-folder-{}", common::unique_suffix());
+    let uid = client
+        .create_folder(&root.uid, &name, None)
+        .await
+        .expect("create_folder");
+
+    let node = get(&client, &uid, "created folder").await;
+    let v = node.verification;
+    assert_eq!(v.name, VerificationStatus::Ok, "folder name must verify");
+    assert_eq!(
+        v.passphrase,
+        VerificationStatus::Ok,
+        "folder passphrase must verify"
+    );
+    assert!(v.is_fully_verified(), "folder must fully verify: {v:?}");
+
+    cleanup(&client, &[uid]).await;
+}
diff --git a/crates/proton-drive-sdk/tests/live_upload_download.rs b/crates/proton-drive-sdk/tests/live_upload_download.rs
index c36aeae..f198e19 100644
--- a/crates/proton-drive-sdk/tests/live_upload_download.rs
+++ b/crates/proton-drive-sdk/tests/live_upload_download.rs
@@ -28,7 +28,7 @@ async fn upload_download_small_roundtrip() {
     let Some(live) = common::live_client().await else {
         return;
     };
-    let client = live.client;
+    let client = &live.client;
 
     let root = client
         .get_my_files_folder()
@@ -57,7 +57,7 @@ async fn upload_download_multiblock_roundtrip() {
     let Some(live) = common::live_client().await else {
         return;
     };
-    let client = live.client;
+    let client = &live.client;
 
     let root = client
         .get_my_files_folder()
@@ -103,7 +103,7 @@ async fn new_revision_roundtrip() {
     let Some(live) = common::live_client().await else {
         return;
     };
-    let client = live.client;
+    let client = &live.client;
 
     let root = client
         .get_my_files_folder()