diff --git a/x/crosschain/keeper/attestation.go b/x/crosschain/keeper/attestation.go
index c93828cf8..0dd09fa8b 100644
--- a/x/crosschain/keeper/attestation.go
+++ b/x/crosschain/keeper/attestation.go
@@ -89,7 +89,7 @@ func (k Keeper) TryAttestation(ctx sdk.Context, att *types.Attestation, claim ty
 		k.SetAttestation(ctx, claim.GetEventNonce(), claim.ClaimHash(), att)
 
 		err := k.processAttestation(ctx, claim)
-		ctx.EventManager().EmitEvent(sdk.NewEvent(
+		event := sdk.NewEvent(
 			types.EventTypeContractEvent,
 			sdk.NewAttribute(sdk.AttributeKeyModule, k.moduleName),
 			sdk.NewAttribute(types.AttributeKeyClaimType, claim.GetType().String()),
@@ -97,7 +97,11 @@ func (k Keeper) TryAttestation(ctx sdk.Context, att *types.Attestation, claim ty
 			sdk.NewAttribute(types.AttributeKeyClaimHash, fmt.Sprint(hex.EncodeToString(claim.ClaimHash()))),
 			sdk.NewAttribute(types.AttributeKeyBlockHeight, fmt.Sprint(claim.GetBlockHeight())),
 			sdk.NewAttribute(types.AttributeKeyStateSuccess, fmt.Sprint(err == nil)),
-		))
+		)
+		if err != nil {
+			event.AppendAttributes(sdk.NewAttribute(types.AttributeKeyErrReason, err.Error()))
+		}
+		ctx.EventManager().EmitEvent(event)
 
 		k.pruneAttestations(ctx)
 		break
diff --git a/x/crosschain/types/events.go b/x/crosschain/types/events.go
index acaa142ac..6afcc20ea 100644
--- a/x/crosschain/types/events.go
+++ b/x/crosschain/types/events.go
@@ -8,6 +8,7 @@ const (
 
 	AttributeKeyBlockHeight  = "block_height"
 	AttributeKeyStateSuccess = "state_success"
+	AttributeKeyErrReason    = "err_reason"
 
 	EventTypeOracleSetUpdate   = "oracle_set_update"
 	AttributeKeyOracleSetNonce = "oracle_set_nonce"