Big risk for bitcoin, the transaction of bitcoin is cancelled

[toaigo]

i have a transaction in Nov 3th, i look up in blockchain.info and find the transaction but the status is unconfirmed status and showing is in queue
but three days later ,when i look up in blockchain.info again and found this transaction is not available and no information appeared for this transaction.

this situation happened, it means for the unconfirmed transactions, it can be reversable.

in my mind, if transaction sent , then it will not and also we are not able to cancel it, but for this transaction, how is it possible to cancel the transaction?

[1715403428]

1715403428

[pontiacg5]

You need to wait for confirmations. This is basic bitcoin stuff here. Unconfirmed coins are exactly that, unconfirmed by the network. Transaction is not to be trusted till it makes it into a block. How many blocks you consider safe is up to you.

[n4ru]

You need to wait for confirmations. This is basic bitcoin stuff here. Unconfirmed coins are exactly that, unconfirmed by the network. Transaction is not to be trusted till it makes it into a block. How many blocks you consider safe is up to you.

I think the issue is that the transaction was never confirmed. This behavior can be observed once in a while sending small transactions without fees.