Canceling a Bitcoin transaction is not a straightforward process and cannot be done once the transaction has been included in the blockchain and received at least one confirmation.

If the transaction is still unconfirmed (pending), there is a possibility to cancel it, but this functionality needs to be built into the wallet app itself. Currently, Coinosh does not provide this feature, but it may be added in the future.

To determine if a transaction can be canceled, check the transaction status in Coinosh. Unconfirmed transactions will be displayed as 'pending'. Once the status changes to 'sending', the transaction cannot be canceled.

It's important to note that canceling a Bitcoin transaction is not guaranteed and depends on various factors, including network conditions and the implementation of cancellation functionality in the wallet app.