diff --git a/ethers/contract.nim b/ethers/contract.nim
index ac5d87d..68a1671 100644
--- a/ethers/contract.nim
+++ b/ethers/contract.nim
@@ -321,7 +321,7 @@ proc subscribe*[E: Event](contract: Contract,
   contract.provider.subscribe(filter, logHandler)
 
 proc confirm(tx: Confirmable, confirmations, timeout: int):
-  Future[TransactionReceipt] {.async.} =
+  Future[TransactionReceipt] {.async: (raises: [CancelledError, EthersError]).} =
 
   without response =? tx.response:
     raise newException(
@@ -338,13 +338,23 @@ proc confirm(tx: Confirmable, confirmations, timeout: int):
 proc confirm*(tx: Future[Confirmable],
               confirmations: int = EthersDefaultConfirmations,
               timeout: int = EthersReceiptTimeoutBlks):
-             Future[TransactionReceipt] {.async.} =
+             Future[TransactionReceipt] {.async: (raises: [CancelledError, EthersError]).} =
   ## Convenience method that allows confirm to be chained to a contract
   ## transaction, eg:
   ## `await token.connect(signer0)
   ##          .mint(accounts[1], 100.u256)
   ##          .confirm(3)`
-  return await (await tx).confirm(confirmations, timeout)
+  try:
+    return await (await tx).confirm(confirmations, timeout)
+  except CancelledError as e:
+    raise e
+  except EthersError as e:
+    raise e
+  except CatchableError as e:
+    raise newException(
+      EthersError,
+      "Error when trying to confirm the contract transaction: " & e.msg
+    )
 
 proc queryFilter[E: Event](contract: Contract,
                             _: type E,
diff --git a/ethers/provider.nim b/ethers/provider.nim
index 8dfb30a..5a2153e 100644
--- a/ethers/provider.nim
+++ b/ethers/provider.nim
@@ -293,13 +293,22 @@ proc confirm*(
 proc confirm*(
   tx: Future[TransactionResponse],
   confirmations: int = EthersDefaultConfirmations,
-  timeout: int = EthersReceiptTimeoutBlks): Future[TransactionReceipt] {.async.} =
+  timeout: int = EthersReceiptTimeoutBlks): Future[TransactionReceipt] {.async: (raises: [CancelledError, EthersError]).} =
   ## Convenience method that allows wait to be chained to a sendTransaction
   ## call, eg:
   ## `await signer.sendTransaction(populated).confirm(3)`
-
-  let txResp = await tx
-  return await txResp.confirm(confirmations, timeout)
+  try:
+    let txResp = await tx
+    return await txResp.confirm(confirmations, timeout)
+  except CancelledError as e:
+    raise e
+  except EthersError as e:
+    raise e
+  except CatchableError as e:
+    raise newException(
+      EthersError,
+      "Error when trying to confirm the provider transaction: " & e.msg
+    )
 
 method close*(
     provider: Provider