diff --git a/codex/codex.nim b/codex/codex.nim
index d5c6d58b..ea3c0068 100644
--- a/codex/codex.nim
+++ b/codex/codex.nim
@@ -39,6 +39,7 @@ import ./contracts/clock
 import ./contracts/deployment
 import ./utils/addrutils
 import ./namespaces
+import ./codextypes
 import ./logutils
 
 logScope:
@@ -131,6 +132,7 @@ proc bootstrapInteractions(
     let sales = Sales.new(market, clock, repo, proofFailures)
     client = some ClientInteractions.new(clock, purchasing)
     host = some HostInteractions.new(clock, sales)
+
   if config.validator:
     let validation = Validation.new(clock, market, config.validatorMaxSlots)
     validator = some ValidatorInteractions.new(clock, validation)
@@ -264,12 +266,21 @@ proc new*(
     store = NetworkStore.new(engine, repoStore)
     erasure = Erasure.new(store, leoEncoderProvider, leoDecoderProvider)
     prover = if config.persistence:
-      circomBackend = CircomCompat.init(config.circomR1cs, config.circomWasm, config.circomZkey)
-      some Prover.new(store, circomBackend)
+      let
+        zkey = if config.circomNoZkey: "" else: config.circomZkey
+      some Prover.new(
+        store,
+        CircomCompat.init(config.circomR1cs, config.circomWasm, zkey))
     else:
       none Prover
 
-    codexNode = CodexNodeRef.new(switch, store, engine, erasure, prover, discovery)
+    codexNode = CodexNodeRef.new(
+      switch = switch,
+      store = store,
+      engine = engine,
+      erasure = erasure,
+      prover = prover,
+      discovery = discovery)
 
     restServer = RestServerRef.new(
       codexNode.initRestApi(config, repoStore),
diff --git a/codex/conf.nim b/codex/conf.nim
index 037197ae..c5f6f5d9 100644
--- a/codex/conf.nim
+++ b/codex/conf.nim
@@ -33,14 +33,15 @@ import pkg/ethers
 import pkg/questionable
 import pkg/questionable/results
 
+import ./codextypes
 import ./discovery
 import ./logutils
 import ./stores
 import ./units
 import ./utils
 
-export units
-export net
+export units, net, codextypes
+
 export
   DefaultQuotaBytes,
   DefaultBlockTtl,
@@ -229,21 +230,33 @@ type
       circomR1cs* {.
         desc: "The r1cs file for the storage circuit"
         defaultValue: defaultDataDir() / "circuits" / "proof_main.r1cs"
-        name: "circuit-r1cs"
+        name: "circom-r1cs"
       .}: string
 
       circomWasm* {.
         desc: "The wasm file for the storage circuit"
         defaultValue: defaultDataDir() / "circuits" / "proof_main.wasm"
-        name: "circuit-wasm"
+        name: "circom-wasm"
       .}: string
 
       circomZkey* {.
         desc: "The zkey file for the storage circuit"
         defaultValue: defaultDataDir() / "circuits" / "proof_main.zkey"
-        name: "circuit-zkey"
+        name: "circom-zkey"
       .}: string
 
+      circomNoZkey* {.
+        desc: "Ignore the zkey file - use only for testing!"
+        defaultValue: false
+        name: "circom-no-zkey"
+      .}: bool
+
+      numProofSamples* {.
+        desc: "Number of samples to prove"
+        defaultValue: DefaultSamplesNum
+        defaultValueDesc: $DefaultSamplesNum
+        name: "proof-samples" }: int
+
       ethProvider* {.
         desc: "The URL of the JSON-RPC API of the Ethereum node"
         defaultValue: "ws://localhost:8545"