diff --git a/codex/contracts/requests.nim b/codex/contracts/requests.nim
index 1e8b94a2..4c6e8b10 100644
--- a/codex/contracts/requests.nim
+++ b/codex/contracts/requests.nim
@@ -3,6 +3,7 @@ import pkg/contractabi
 import pkg/nimcrypto
 import pkg/ethers/fields
 import pkg/questionable/results
+import pkg/stew/byteutils
 
 export contractabi
 
@@ -63,6 +64,15 @@ func toArray*(id: RequestId | SlotId | Nonce): array[32, byte] =
 proc `$`*(id: RequestId | SlotId | Nonce): string =
   id.toArray.toHex
 
+proc fromHex*(T: type RequestId, hex: string): T =
+  T array[32, byte].fromHex(hex)
+
+proc fromHex*(T: type SlotId, hex: string): T =
+  T array[32, byte].fromHex(hex)
+
+proc fromHex*(T: type Nonce, hex: string): T =
+  T array[32, byte].fromHex(hex)
+
 func fromTuple(_: type StorageRequest, tupl: tuple): StorageRequest =
   StorageRequest(
     client: tupl[0],
diff --git a/codex/rest/json.nim b/codex/rest/json.nim
index 1a7941eb..d53a3ac6 100644
--- a/codex/rest/json.nim
+++ b/codex/rest/json.nim
@@ -60,4 +60,5 @@ func `%`*(purchase: Purchase): JsonNode =
     "state": (purchase.state as PurchaseState).?description |? "none",
     "error": purchase.error.?msg,
     "request": purchase.request,
+    "requestId": purchase.requestId
   }
diff --git a/tests/integration/testproofs.nim b/tests/integration/testproofs.nim
index b9851aef..7581b520 100644
--- a/tests/integration/testproofs.nim
+++ b/tests/integration/testproofs.nim
@@ -1,4 +1,4 @@
-import std/os
+import std/sequtils
 import codex/contracts/marketplace
 import codex/contracts/deployment
 import codex/periods
@@ -96,18 +96,131 @@ twonodessuite "Proving integration test", debug1=false, debug2=false:
     await subscription.unsubscribe()
     stopValidator(validator)
 
+invalidproofsuite "Simulate invalid proofs", debugClient=false, debugProvider=false:
+
+  var marketplace: Marketplace
+  var period: uint64
+  var proofSubmitted: Future[void]
+  var subscription: Subscription
+  var submitted: seq[seq[byte]]
+  var missed: UInt256
+  var slotId: SlotId
+  var validator: NodeProcess
+
+
+  proc startValidator: NodeProcess =
+    let datadir = getTempDir() / "CodexValidator"
+    startNode([
+      "--data-dir=" & datadir,
+      "--api-port=8180",
+      "--disc-port=8190",
+      "--validator",
+      "--eth-account=" & $accounts[2]
+    ], debug = true)
+
+  proc stopValidator(node: NodeProcess) =
+    node.stop()
+    removeDir(getTempDir() / "CodexValidator")
+
+  setup:
+    let deployment = Deployment.init()
+    marketplace = Marketplace.new(!deployment.address(Marketplace), provider)
+    period = (await marketplace.config()).proofs.period.truncate(uint64)
+    await provider.getSigner(accounts[0]).mint()
+    await provider.getSigner(accounts[1]).mint()
+    await provider.getSigner(accounts[1]).deposit()
+    proofSubmitted = newFuture[void]("proofSubmitted")
+    proc onProofSubmitted(event: ProofSubmitted) =
+      debugEcho ">>> proof submitted: ", event.proof
+      submitted.add(event.proof)
+      proofSubmitted.complete()
+      proofSubmitted = newFuture[void]("proofSubmitted")
+    subscription = await marketplace.subscribe(ProofSubmitted, onProofSubmitted)
+    missed = 0.u256
+    slotId = SlotId(array[32, byte].default)
+    validator = startValidator()
+
+  teardown:
+    await subscription.unsubscribe()
+    validator.stopValidator()
+
+  proc waitUntilPurchaseIsStarted(proofProbability: uint64 = 3,
+                                  duration: uint64 = 100 * period,
+                                  expiry: uint64 = 30) {.async.} =
+
+    if clients().len < 1 or providers().len < 1:
+      raiseAssert("must start at least one client and one provider")
+
+    let client = clients()[0].restClient
+    let storageProvider = providers()[0].restClient
+
+    discard storageProvider.postAvailability(
+      size=0xFFFFF,
+      duration=duration,
+      minPrice=300
+    )
+    let cid = client.upload("some file contents " & $ getTime().toUnix)
+    let expiry = (await provider.currentTime()) + expiry.u256
+    let purchase = client.requestStorage(
+      cid,
+      expiry=expiry,
+      duration=duration,
+      proofProbability=proofProbability,
+      reward=400
+    )
+    check eventually client.getPurchase(purchase){"state"} == %"started"
+    let requestId = RequestId.fromHex client.getPurchase(purchase){"requestId"}.getStr
+    slotId = slotId(requestId, 0.u256)
+
+
+  proc advanceToNextPeriod() {.async.} =
+    await provider.advanceTime(period.u256)
+
+  proc waitForProvingRounds(rounds: Positive) {.async.} =
+    var rnds = rounds - 1 # proof round runs prior to advancing
+    missed += await marketplace.missingProofs(slotId)
+
+    while rnds > 0:
+      await advanceToNextPeriod()
+      rnds -= 1
+
+  proc invalid(proofs: seq[seq[byte]]): uint =
+    proofs.count(@[]).uint
+
   test "simulates invalid proof every N proofs":
     # TODO: waiting on validation work to be completed before these tests are possible
     # 1. instantiate node manually (startNode) with --simulate-failed-proofs=3
     # 2. check that the number of expected proofs are missed
-    check 1 == 1
+    let failEveryNProofs = 3
+    let totalProofs = 6
+    let expectedInvalid = totalProofs div failEveryNProofs
+    let expectedValid = totalProofs - expectedInvalid
+    startProviderNode(failEveryNProofs.uint)
 
-  test "does not simulate invalid proof when --simulate-failed-proofs is 0":
-    # 1. instantiate node manually (startNode) with --simulate-failed-proofs=0
-    # 2. check that the number of expected missed proofs is 0
-    check 1 == 1
+    await waitUntilPurchaseIsStarted(proofProbability=1)
+    await waitForProvingRounds(totalProofs)
 
-  test "does not simulate invalid proof when chainId is 1":
-    # 1. instantiate node manually (startNode) with --simulate-failed-proofs=3
-    # 2. check that the number of expected missed proofs is 0
-    check 1 == 1
+    check eventually submitted.len == expectedValid
+    check missed.truncate(int) == expectedInvalid
+
+
+  #   await waitUntilPurchaseIsStarted(proofProbability=1)
+  #   var proofWasSubmitted = false
+  #   proc onProofSubmitted(event: ProofSubmitted) =
+  #     proofWasSubmitted = true
+  #   let subscription = await marketplace.subscribe(ProofSubmitted, onProofSubmitted)
+  #   await provider.advanceTime(period.u256)
+  #   check eventually proofWasSubmitted
+  #   await subscription.unsubscribe()
+
+  #   check 1 == 1
+
+  # test "does not simulate invalid proof when --simulate-failed-proofs is 0":
+  #   # 1. instantiate node manually (startNode) with --simulate-failed-proofs=0
+  #   # 2. check that the number of expected missed proofs is 0
+  #   check 1 == 1
+
+  # test "does not simulate invalid proof when chainId is 1":
+  #   # 1. instantiate node manually (startNode) with --simulate-failed-proofs=3
+  #   # 2. check that the number of expected missed proofs is 0
+  #   check 1 == 1
\ No newline at end of file
diff --git a/tests/integration/twonodes.nim b/tests/integration/twonodes.nim
index 306a8af1..fe6cce9b 100644
--- a/tests/integration/twonodes.nim
+++ b/tests/integration/twonodes.nim
@@ -60,3 +60,85 @@ template twonodessuite*(name: string, debug1, debug2: bool, body) =
       removeDir(dataDir2)
 
     body
+
+type
+  Role = enum
+    Client,
+    Provider
+  RunningNode* = ref object
+    role: Role
+    node: NodeProcess
+    restClient: CodexClient
+    datadir: string
+
+template invalidproofsuite*(name: string, debugClient, debugProvider: bool, body) =
+
+
+
+  ethersuite name:
+
+    var running: seq[RunningNode]
+    var bootstrap: string
+
+    proc newNodeProcess(index: int,
+                        addlOptions: seq[string],
+                        debug: bool): (NodeProcess, string) =
+
+      let datadir = getTempDir() / "Codex" & $index
+      let node = startNode(@[
+        "--api-port=" & $(8080 + index),
+        "--data-dir=" & datadir,
+        "--nat=127.0.0.1",
+        "--disc-ip=127.0.0.1",
+        "--disc-port=" & $(8090 + index),
+        "--persistence",
+        "--eth-account=" & $accounts[index]
+      ].concat(addlOptions), debug = debug)
+      debugEcho "started new codex node listening with rest api listening on port ", 8080 + index
+      (node, datadir)
+
+    proc newCodexClient(index: int): CodexClient =
+      debugEcho "started new rest client talking to port ", 8080 + index
+      CodexClient.new("http://localhost:" & $(8080 + index) & "/api/codex/v1")
+
+    proc startClientNode() =
+      let index = running.len
+      let (node, datadir) = newNodeProcess(index, @[], debugClient)
+      let restClient = newCodexClient(index)
+      running.add RunningNode(role: Role.Client,
+                              node: node,
+                              restClient: restClient,
+                              datadir: datadir)
+      debugEcho "started client node, index ", index
+
+    proc startProviderNode(failEveryNProofs: uint) =
+      let index = running.len
+      let (node, datadir) = newNodeProcess(index, @[
+        "--bootstrap-node=" & bootstrap,
+        "--simulate-proof-failures=" & $failEveryNProofs],
+        debugProvider)
+      let restClient = newCodexClient(index)
+      running.add RunningNode(role: Role.Provider,
+                              node: node,
+                              restClient: restClient,
+                              datadir: datadir)
+      debugEcho "started provider node, index ", index
+
+    proc clients(): seq[RunningNode] =
+      running.filter(proc(r: RunningNode): bool = r.role == Role.Client)
+
+    proc providers(): seq[RunningNode] =
+      running.filter(proc(r: RunningNode): bool = r.role == Role.Provider)
+
+    setup:
+      startClientNode()
+
+      bootstrap = running[0].restClient.info()["spr"].getStr()
+
+    teardown:
+      for r in running:
+        r.restClient.close()
+        r.node.stop()
+        removeDir(r.datadir)
+
+    body