diff --git a/crates/lox-library/src/cred.rs b/crates/lox-library/src/cred.rs
index a0a320d..9f0fc57 100644
--- a/crates/lox-library/src/cred.rs
+++ b/crates/lox-library/src/cred.rs
@@ -6,6 +6,7 @@ zero-knowledge proof of its correctness (as it does at issuing time). */
 
 use curve25519_dalek::ristretto::RistrettoPoint;
 use curve25519_dalek::scalar::Scalar;
+use serde::{Deserialize, Serialize};
 
 /// A migration credential.
 ///
@@ -15,7 +16,7 @@ use curve25519_dalek::scalar::Scalar;
 /// from a 1-bridge untrusted bucket to a 3-bridge trusted bucket) and 1
 /// for blockage migrations (moving buckets because the from_bucket has
 /// been blocked).
-#[derive(Debug)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct Migration {
     pub P: RistrettoPoint,
     pub Q: RistrettoPoint,
@@ -31,7 +32,7 @@ pub struct Migration {
 /// authority), but known only to the user.  The level_since date is the
 /// Julian date of when this user was changed to the current trust
 /// level.
-#[derive(Debug)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct Lox {
     pub P: RistrettoPoint,
     pub Q: RistrettoPoint,
@@ -57,7 +58,7 @@ pub struct Lox {
 /// That way, people entitled to migrate buckets can receive a Migration
 /// credential with their new bucket, without the BA learning either
 /// their old or new buckets.
-#[derive(Debug)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct MigrationKey {
     pub P: RistrettoPoint,
     pub Q: RistrettoPoint,
@@ -73,7 +74,7 @@ pub struct MigrationKey {
 /// credential (in zero knowledge) with today's date to prove that the
 /// bridges in their bucket have not been blocked, in order to gain a
 /// trust level.
-#[derive(Debug)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct BucketReachability {
     pub P: RistrettoPoint,
     pub Q: RistrettoPoint,
@@ -89,7 +90,7 @@ pub struct BucketReachability {
 /// as the inviter, and inherits the inviter's blockages count (so that
 /// you can't clear your blockages count simply by inviting yourself).
 /// Invitations expire after some amount of time.
-#[derive(Debug)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct Invitation {
     pub P: RistrettoPoint,
     pub Q: RistrettoPoint,