diff --git a/Cargo.lock b/Cargo.lock
index 3f95bf34..5ca04615 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2698,13 +2698,13 @@ checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
 [[package]]
 name = "flexible-transcript"
-version = "0.3.3"
+version = "0.3.4"
 dependencies = [
  "blake2",
  "digest 0.10.7",
  "merlin",
- "rustversion",
  "sha2",
+ "std-shims",
  "subtle",
  "zeroize",
 ]
diff --git a/crypto/ciphersuite/Cargo.toml b/crypto/ciphersuite/Cargo.toml
index e2af42aa..ee2b103c 100644
--- a/crypto/ciphersuite/Cargo.toml
+++ b/crypto/ciphersuite/Cargo.toml
@@ -7,7 +7,7 @@ repository = "https://github.com/serai-dex/serai/tree/develop/crypto/ciphersuite
 authors = ["Luke Parker <lukeparker5132@gmail.com>"]
 keywords = ["ciphersuite", "ff", "group"]
 edition = "2021"
-rust-version = "1.73"
+rust-version = "1.66"
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/crypto/dkg/Cargo.toml b/crypto/dkg/Cargo.toml
index c9f2642b..4802034d 100644
--- a/crypto/dkg/Cargo.toml
+++ b/crypto/dkg/Cargo.toml
@@ -7,7 +7,7 @@ repository = "https://github.com/serai-dex/serai/tree/develop/crypto/dkg"
 authors = ["Luke Parker <lukeparker5132@gmail.com>"]
 keywords = ["dkg", "multisig", "threshold", "ff", "group"]
 edition = "2021"
-rust-version = "1.73"
+rust-version = "1.66"
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/crypto/dkg/dealer/Cargo.toml b/crypto/dkg/dealer/Cargo.toml
index 78b37167..0b1b81bf 100644
--- a/crypto/dkg/dealer/Cargo.toml
+++ b/crypto/dkg/dealer/Cargo.toml
@@ -7,7 +7,7 @@ repository = "https://github.com/serai-dex/serai/tree/develop/crypto/dkg/dealer"
 authors = ["Luke Parker <lukeparker5132@gmail.com>"]
 keywords = ["dkg", "multisig", "threshold", "ff", "group"]
 edition = "2021"
-rust-version = "1.73"
+rust-version = "1.66"
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/crypto/dkg/recovery/Cargo.toml b/crypto/dkg/recovery/Cargo.toml
index 9c85d701..db09125b 100644
--- a/crypto/dkg/recovery/Cargo.toml
+++ b/crypto/dkg/recovery/Cargo.toml
@@ -7,7 +7,7 @@ repository = "https://github.com/serai-dex/serai/tree/develop/crypto/dkg/recover
 authors = ["Luke Parker <lukeparker5132@gmail.com>"]
 keywords = ["dkg", "multisig", "threshold", "ff", "group"]
 edition = "2021"
-rust-version = "1.73"
+rust-version = "1.66"
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/crypto/transcript/Cargo.toml b/crypto/transcript/Cargo.toml
index 39d84bb9..b15c009e 100644
--- a/crypto/transcript/Cargo.toml
+++ b/crypto/transcript/Cargo.toml
@@ -1,13 +1,13 @@
 [package]
 name = "flexible-transcript"
-version = "0.3.3"
+version = "0.3.4"
 description = "A simple transcript trait definition, along with viable options"
 license = "MIT"
 repository = "https://github.com/serai-dex/serai/tree/develop/crypto/transcript"
 authors = ["Luke Parker <lukeparker5132@gmail.com>"]
 keywords = ["transcript"]
 edition = "2021"
-rust-version = "1.73"
+rust-version = "1.66"
 
 [package.metadata.docs.rs]
 all-features = true
@@ -17,7 +17,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 workspace = true
 
 [dependencies]
-rustversion = "1"
+std-shims = { path = "../../common/std-shims", version = "0.1.4", default-features = false }
 
 subtle = { version = "^2.4", default-features = false }
 zeroize = { version = "^1.5", default-features = false }
@@ -32,8 +32,7 @@ sha2 = { version = "0.10", default-features = false }
 blake2 = { version = "0.10", default-features = false }
 
 [features]
-std = ["subtle/std", "zeroize/std", "digest/std", "blake2?/std", "merlin?/std"]
+std = ["std-shims/std", "subtle/std", "zeroize/std", "digest/std", "blake2?/std", "merlin?/std"]
 recommended = ["blake2"]
-merlin = ["dep:merlin"]
 tests = []
 default = ["std"]
diff --git a/crypto/transcript/src/lib.rs b/crypto/transcript/src/lib.rs
index 3956f51d..988ab039 100644
--- a/crypto/transcript/src/lib.rs
+++ b/crypto/transcript/src/lib.rs
@@ -2,6 +2,9 @@
 #![doc = include_str!("../README.md")]
 #![no_std]
 
+#[allow(unused_imports)]
+use std_shims::prelude::*;
+
 use zeroize::Zeroize;
 
 use digest::{
@@ -159,35 +162,12 @@ where
     // These writes may be optimized out if they're never read
     // Attempt to get them marked as read
 
-    #[rustversion::since(1.66)]
     fn mark_read<D: Send + Clone + SecureDigest>(transcript: &DigestTranscript<D>) {
       // Just get a challenge from the state
       let mut challenge = core::hint::black_box(transcript.0.clone().finalize());
       challenge.as_mut().zeroize();
     }
 
-    #[rustversion::before(1.66)]
-    fn mark_read<D: Send + Clone + SecureDigest>(transcript: &mut DigestTranscript<D>) {
-      // Get a challenge
-      let challenge = transcript.0.clone().finalize();
-
-      // Attempt to use subtle's, non-exposed black_box function, by creating a Choice from this
-      // challenge
-
-      let mut read = 0;
-      for byte in challenge.as_ref() {
-        read ^= byte;
-      }
-      challenge.as_mut().zeroize();
-
-      // Since this Choice isn't further read, its creation may be optimized out, including its
-      // internal black_box
-      // This remains our best attempt
-      let mut choice = bool::from(subtle::Choice::from(read >> 7));
-      read.zeroize();
-      choice.zeroize();
-    }
-
     mark_read(self)
   }
 }
diff --git a/crypto/transcript/src/tests.rs b/crypto/transcript/src/tests.rs
index ce5a0a1c..2308d5a5 100644
--- a/crypto/transcript/src/tests.rs
+++ b/crypto/transcript/src/tests.rs
@@ -1,6 +1,8 @@
 use crate::Transcript;
 
 /// Test the sanity of a transcript.
+///
+/// This will panic if sanity checks fail.
 pub fn test_transcript<T: Transcript<Challenge: PartialEq>>() {
   // Ensure distinct names cause distinct challenges
   {