diff --git a/src/transaction_builder.js b/src/transaction_builder.js
index 40d910e..146b38c 100644
--- a/src/transaction_builder.js
+++ b/src/transaction_builder.js
@@ -38,8 +38,6 @@ function extractChunks (type, chunks, script) {
         return chunk.length === 0 ? undefined : chunk
       })
       break
-    default:
-      throw new Error('Only bare scripts can be handled here: not ', type)
   }
   return {
     pubKeys: pubKeys,
@@ -142,10 +140,6 @@ function expandInput (scriptSig, witnessStack) {
     chunks = scriptSigChunks
   }
 
-  if (SIGNABLE.indexOf(scriptType) === -1) {
-    throw new Error(scriptType + ' not supported')
-  }
-
   var expanded = extractChunks(scriptType, chunks, script)
 
   var result = {