diff --git a/src/codex32/_bitcoin_core.py b/src/codex32/_bitcoin_core.py
index 84a73e1..25aaf00 100644
--- a/src/codex32/_bitcoin_core.py
+++ b/src/codex32/_bitcoin_core.py
@@ -301,11 +301,11 @@ def _select(
         ask: Callable[[str], str],
         tell: Callable[[str], None],
     ) -> str:
+        def use(name: str) -> bool:
+            return ask(f"Use blank wallet {json.dumps(name)}? [y/N]").lower() in ("y", "yes")
+
         choices = tuple(name for name in sorted(self._names()) if self._target(name) is not None)
-        if len(choices) == 1 and ask(f"Use blank wallet {json.dumps(choices[0])}? [y/N]").lower() in (
-            "y",
-            "yes",
-        ):
+        if len(choices) == 1 and use(choices[0]):
             return choices[0]
         while True:
             if choices:
@@ -316,10 +316,7 @@ def _select(
                 answer = ask("Choose a wallet number")
                 if answer.isdecimal() and 1 <= int(answer) <= len(choices):
                     name = choices[int(answer) - 1]
-                    if ask(f"Use blank wallet {json.dumps(name)}? [y/N]").lower() in (
-                        "y",
-                        "yes",
-                    ):
+                    if use(name):
                         return name
                     continue
                 if answer != str(len(choices) + 1):
@@ -339,10 +336,7 @@ def _select(
                 if appeared:
                     break
             choices = tuple(name for name in sorted(names) if self._target(name) is not None)
-            if len(appeared) == 1 and ask(f"Use blank wallet {json.dumps(appeared[0])}? [y/N]").lower() in (
-                "y",
-                "yes",
-            ):
+            if len(appeared) == 1 and use(appeared[0]):
                 return appeared[0]
 
     def initialize(
diff --git a/src/codex32/cli.py b/src/codex32/cli.py
index a9ff364..8b27eb8 100644
--- a/src/codex32/cli.py
+++ b/src/codex32/cli.py
@@ -50,7 +50,7 @@
     _residue_low_discrimination,
     correct_worksheet_residue,
 )
-from codex32.errors import CodexError, HeaderCollision, InvalidCorrectionInput
+from codex32.errors import CodexError, InvalidCorrectionInput
 from codex32.generation import (
     ConfirmationResult,
     CreationCeremony,
@@ -109,12 +109,11 @@ def _secret(artifacts: list[Artifact]) -> Secret:
 
 
 def _master_seed(fingerprint: Callable[[MasterSeed], bytes] | None = None) -> MasterSeed:
-    if isinstance(
-        value := _secret(_artifacts(profiles=(Profile.MS,), initial_prefix="MS1", fingerprint=fingerprint)),
+    # Only ms input is accepted, and an ms secret is always a MasterSeed.
+    return cast(
         MasterSeed,
-    ):
-        return value
-    raise _UsageError("Wallet commands accept only Bitcoin master-seed secrets.")
+        _secret(_artifacts(profiles=(Profile.MS,), initial_prefix="MS1", fingerprint=fingerprint)),
+    )
 
 
 def _summary(artifact: Artifact, *, valid: bool = False) -> list[str]:
@@ -483,8 +482,6 @@ def _create(
 ) -> int:
     profile, selected_threshold, identifier = _creation_header(header)
     threshold = 0 if selected_threshold is None else selected_threshold
-    if profile is not Profile.MS:
-        raise _UsageError("Only Bitcoin master-seed backups can be created.")
     if shares is not None and indices is not None:
         raise _UsageError("Choose either --shares or --indices, not both.")
     if byte_length is not None and existing:
@@ -498,8 +495,6 @@ def _create(
             raise _UsageError("For thresholds 4 through 9, choose --shares or --indices.")
     core = _connected_core()
     source = _creation_source(profile) if existing else None
-    if not existing and not sys.stdin.isatty() and _text("", optional=True):
-        raise _UsageError("Use --existing when supplying a seed or secret.")
     if isinstance(source, (Share, Secret)) and not isinstance(source, MasterSeed):
         raise _UsageError(f"Enter one {_profile_rules(profile).label}, not a share or another backup type.")
     try:
@@ -547,8 +542,6 @@ def _create(
                 share_count=shares,
                 indices=indices,
             )
-    except HeaderCollision as error:
-        raise _CommandError(f"{error}; choose another set header") from error
     except CodexError as error:
         raise _CommandError(str(error)) from error
     output_count = shares if shares is not None else len(indices or "")