diff --git a/.changeset/fluffy-geckos-allow.md b/.changeset/fluffy-geckos-allow.md
new file mode 100644
index 000000000..f97cd7985
--- /dev/null
+++ b/.changeset/fluffy-geckos-allow.md
@@ -0,0 +1,6 @@
+---
+'@sphinx-labs/plugins': patch
+'@sphinx-labs/core': patch
+---
+
+Detect invalid network names for overrides
diff --git a/packages/core/src/config/parse.ts b/packages/core/src/config/parse.ts
index bb736d591..0289987f0 100644
--- a/packages/core/src/config/parse.ts
+++ b/packages/core/src/config/parse.ts
@@ -99,6 +99,7 @@ import {
 } from '../addresses'
 import { getTargetAddress, getTargetSalt, toContractKindEnum } from './utils'
 import {
+  SUPPORTED_LOCAL_NETWOKRS,
   SUPPORTED_MAINNETS,
   SUPPORTED_NETWORKS,
   SUPPORTED_TESTNETS,
@@ -1623,7 +1624,14 @@ export const parseContractConstructorArgs = (
     )
   }
 
-  // Todo - check if any of network names listed in overrides are invalid
+  const invalidOverrideChains = userContractConfig.overrides?.flatMap((el) =>
+    el.chains.filter(
+      (name) =>
+        !Object.keys(SUPPORTED_MAINNETS).includes(name) &&
+        !Object.keys(SUPPORTED_TESTNETS).includes(name) &&
+        !Object.keys(SUPPORTED_LOCAL_NETWOKRS).includes(name)
+    )
+  )
 
   // Check if there are any variables which have ambiguous overrides (due to fields being listed multiple times for a given network)
   const ambigiousArgOverrides: {
@@ -1782,6 +1790,16 @@ export const parseContractConstructorArgs = (
     })
   }
 
+  if (invalidOverrideChains && invalidOverrideChains.length > 0) {
+    logValidationError(
+      'error',
+      `Detected invalid override network names for ${referenceName}:`,
+      invalidOverrideChains,
+      cre.silent,
+      cre.stream
+    )
+  }
+
   if (ambiguousArgOutput.length > 0) {
     logValidationError(
       'error',
diff --git a/packages/core/src/tasks/index.ts b/packages/core/src/tasks/index.ts
index e92d08fe7..a392f3d86 100644
--- a/packages/core/src/tasks/index.ts
+++ b/packages/core/src/tasks/index.ts
@@ -106,8 +106,12 @@ export const proposeAbstractTask = async (
   getProviderForChainId: GetProviderForChainId,
   spinner: ora.Ora = ora({ isSilent: true }),
   failureAction: FailureAction = FailureAction.EXIT,
-  getCanonicalConfig: GetCanonicalConfig = fetchCanonicalConfig
-): Promise<ProposalRequest | undefined> => {
+  getCanonicalConfig: GetCanonicalConfig = fetchCanonicalConfig,
+  signMetaTxn: boolean = true
+): Promise<{
+  proposalRequest: ProposalRequest | undefined
+  ipfsData: string[] | undefined
+}> => {
   const apiKey = process.env.SPHINX_API_KEY
   if (!apiKey) {
     throw new Error(`Must provide a 'SPHINX_API_KEY' environment variable.`)
@@ -233,7 +237,7 @@ export const proposeAbstractTask = async (
     spinner.succeed(
       `Skipping proposal because your Sphinx config file has not changed.`
     )
-    return
+    return { proposalRequest: undefined, ipfsData: undefined }
   }
 
   if (!cre.confirm && !dryRun) {
@@ -263,9 +267,10 @@ export const proposeAbstractTask = async (
 
   // Sign the meta-txn for the auth root, or leave it undefined if we're not relaying the proposal
   // to the back-end.
-  const metaTxnSignature = dryRun
-    ? undefined
-    : await signAuthRootMetaTxn(wallet, root)
+  const metaTxnSignature =
+    !dryRun && !signMetaTxn
+      ? undefined
+      : await signAuthRootMetaTxn(wallet, root)
 
   const proposalRequestLeafs: Array<ProposalRequestLeaf> = []
   for (const bundledLeaf of bundledLeafs) {
@@ -393,10 +398,10 @@ export const proposeAbstractTask = async (
     },
   }
 
+  const compilerConfigArray = Object.values(compilerConfigs)
   if (!dryRun) {
     const websiteLink = blue(hyperlink('website', WEBSITE_URL))
     await relayProposal(proposalRequest)
-    const compilerConfigArray = Object.values(compilerConfigs)
     await relayIPFSCommit(apiKey, orgId, compilerConfigArray)
     spinner.succeed(
       `Proposal succeeded! Go to the ${websiteLink} to approve the deployment.`
@@ -405,7 +410,7 @@ export const proposeAbstractTask = async (
     spinner.succeed(`Proposal dry run succeeded!`)
   }
 
-  return proposalRequest
+  return { proposalRequest, ipfsData: compilerConfigArray }
 }
 
 export const sphinxCommitAbstractSubtask = async (
diff --git a/packages/plugins/test/MultiChain.spec.ts b/packages/plugins/test/MultiChain.spec.ts
index 217822117..a258cbe11 100644
--- a/packages/plugins/test/MultiChain.spec.ts
+++ b/packages/plugins/test/MultiChain.spec.ts
@@ -133,7 +133,7 @@ describe('Multi chain projects', () => {
             },
           }
 
-          const proposalRequest = await proposeAbstractTask(
+          const { proposalRequest } = await proposeAbstractTask(
             newProjectTestInfo.userConfig,
             true,
             cre,
@@ -145,13 +145,9 @@ describe('Multi chain projects', () => {
             getCanonicalConfig
           )
 
-          if (!proposalRequest) {
-            throw new Error('The proposal is empty. Should never happen.')
-          }
-
           await proposeThenApproveDeploymentThenExecute(
             newProjectTestInfo,
-            proposalRequest,
+            proposalRequest!,
             initialTestnets
           )
         })
@@ -192,7 +188,7 @@ describe('Multi chain projects', () => {
           )
 
           // Deploy the project on the existing chains.
-          const proposalRequest = await proposeAbstractTask(
+          const { proposalRequest } = await proposeAbstractTask(
             newProjectTestInfo.userConfig,
             true,
             cre,
diff --git a/packages/plugins/test/helpers.ts b/packages/plugins/test/helpers.ts
index 77e55a377..1962a2840 100644
--- a/packages/plugins/test/helpers.ts
+++ b/packages/plugins/test/helpers.ts
@@ -261,7 +261,7 @@ export const setupThenProposeThenApproveDeploymentThenExecute = async (
   const { authAddress, userConfig, ownerPrivateKeys, proposerAddresses } =
     projectTestInfo
 
-  const proposalRequest = await proposeAbstractTask(
+  const { proposalRequest } = await proposeAbstractTask(
     userConfig,
     true, // Is testnet
     cre,