diff --git a/crypto/ciphersuite/src/lib.rs b/crypto/ciphersuite/src/lib.rs
index ab5a0a4b..fde5306c 100644
--- a/crypto/ciphersuite/src/lib.rs
+++ b/crypto/ciphersuite/src/lib.rs
@@ -42,7 +42,9 @@ mod ed448;
 pub use ed448::*;
 
 /// Unified trait defining a ciphersuite around an elliptic curve.
-pub trait Ciphersuite: Clone + Copy + PartialEq + Eq + Debug + Zeroize {
+pub trait Ciphersuite:
+  'static + Send + Sync + Clone + Copy + PartialEq + Eq + Debug + Zeroize
+{
   /// Scalar field element type.
   // This is available via G::Scalar yet `C::G::Scalar` is ambiguous, forcing horrific accesses
   type F: PrimeField + PrimeFieldBits + Zeroize;
diff --git a/crypto/frost/src/algorithm.rs b/crypto/frost/src/algorithm.rs
index ca6108dc..43a11a3d 100644
--- a/crypto/frost/src/algorithm.rs
+++ b/crypto/frost/src/algorithm.rs
@@ -21,11 +21,11 @@ impl WriteAddendum for () {
 }
 
 /// Trait alias for the requirements to be used as an addendum.
-pub trait Addendum: Clone + PartialEq + Debug + WriteAddendum {}
-impl<A: Clone + PartialEq + Debug + WriteAddendum> Addendum for A {}
+pub trait Addendum: Send + Clone + PartialEq + Debug + WriteAddendum {}
+impl<A: Send + Clone + PartialEq + Debug + WriteAddendum> Addendum for A {}
 
 /// Algorithm trait usable by the FROST signing machine to produce signatures..
-pub trait Algorithm<C: Curve>: Clone {
+pub trait Algorithm<C: Curve>: Send + Clone {
   /// The transcript format this algorithm uses. This likely should NOT be the IETF-compatible
   /// transcript included in this crate.
   type Transcript: Clone + Debug + Transcript;
@@ -120,7 +120,7 @@ mod sealed {
 pub(crate) use sealed::IetfTranscript;
 
 /// HRAm usable by the included Schnorr signature algorithm to generate challenges.
-pub trait Hram<C: Curve>: Clone {
+pub trait Hram<C: Curve>: Send + Clone {
   /// HRAm function to generate a challenge.
   /// H2 from the IETF draft, despite having a different argument set (not being pre-formatted).
   #[allow(non_snake_case)]
diff --git a/crypto/frost/src/sign.rs b/crypto/frost/src/sign.rs
index 9634b161..089c82c3 100644
--- a/crypto/frost/src/sign.rs
+++ b/crypto/frost/src/sign.rs
@@ -89,7 +89,7 @@ impl<C: Curve, A: Addendum> Writable for Preprocess<C, A> {
 pub struct CachedPreprocess(pub Zeroizing<[u8; 32]>);
 
 /// Trait for the initial state machine of a two-round signing protocol.
-pub trait PreprocessMachine {
+pub trait PreprocessMachine: Send {
   /// Preprocess message for this machine.
   type Preprocess: Clone + PartialEq + Writable;
   /// Signature produced by this machine.
@@ -203,7 +203,7 @@ impl<C: Curve> SignatureShare<C> {
 }
 
 /// Trait for the second machine of a two-round signing protocol.
-pub trait SignMachine<S>: Sized {
+pub trait SignMachine<S>: Send + Sized {
   /// Params used to instantiate this machine which can be used to rebuild from a cache.
   type Params: Clone;
   /// Keys used for signing operations.
@@ -436,7 +436,7 @@ impl<C: Curve, A: Algorithm<C>> SignMachine<A::Signature> for AlgorithmSignMachi
 }
 
 /// Trait for the final machine of a two-round signing protocol.
-pub trait SignatureMachine<S> {
+pub trait SignatureMachine<S>: Send {
   /// SignatureShare message for this machine.
   type SignatureShare: Clone + PartialEq + Writable;