diff --git a/beacon_chain.nimble b/beacon_chain.nimble
index 14e2becad..26e512c5d 100644
--- a/beacon_chain.nimble
+++ b/beacon_chain.nimble
@@ -48,5 +48,9 @@ task test, "Run all tests":
   buildBinary "all_tests", "tests/", "-r -d:release -d:chronicles_log_level=ERROR"
   # Minimal config
   buildBinary "all_tests", "tests/", "-r -d:release -d:chronicles_log_level=ERROR -d:const_preset=minimal"
+
+  buildBinary "test_fixture_ssz_static", "tests/official", "-r -d:release -d:chronicles_log_level=DEBUG -d:const_preset=minimal"
+  buildBinary "test_fixture_ssz_static", "tests/official", "-r -d:release -d:chronicles_log_level=DEBUG -d:const_preset=mainnet"
+
   # State sim; getting into 3rd epoch useful
   buildBinary "state_sim", "research/", "-r -d:release", "--validators=128 --slots=140"
diff --git a/beacon_chain/spec/crypto.nim b/beacon_chain/spec/crypto.nim
index aac0c4f62..2f9bb1a58 100644
--- a/beacon_chain/spec/crypto.nim
+++ b/beacon_chain/spec/crypto.nim
@@ -280,3 +280,15 @@ else:
 proc read*(rlp: var Rlp, T: type ValidatorSig): T {.inline.} =
   let bytes = fromBytes(T, rlp.toBytes)
 
+proc writeValue*(writer: var JsonWriter, value: VerKey) {.inline.} =
+  writer.writeValue($value)
+
+proc readValue*(reader: var JsonReader, value: var VerKey) {.inline.} =
+  value = VerKey.init(reader.readValue(string))
+
+proc writeValue*(writer: var JsonWriter, value: Signature) {.inline.} =
+  writer.writeValue($value)
+
+proc readValue*(reader: var JsonReader, value: var Signature) {.inline.} =
+  value = Signature.init(reader.readValue(string))
+
diff --git a/tests/all_tests.nim b/tests/all_tests.nim
index 45fa759d2..203d4b688 100644
--- a/tests/all_tests.nim
+++ b/tests/all_tests.nim
@@ -20,5 +20,4 @@ import # Unit test
 import # Official fixtures
   ./official/test_fixture_shuffling,
   ./official/test_fixture_bls,
-  ./official/test_fixture_ssz_uint,
-  ./official/test_fixture_ssz_static
+  ./official/test_fixture_ssz_uint