4

I am trying to create a transaction via the Iri API (using curl), I understand that I must first find 2 unapproved transactions using "getTransactionsToApprove". These unapproved transactions are also called tips, correct? And they are unconfirmed transactions, correct?

Once I get these 2 tip transactions hashes, if I take too much time creating my transaction object and running attachToTangle, won't those 2 transactions (trunkTransaction and branchTransaction) not be tips anymore, confirmed by another transaction??

1

Transaction to approve are indeed called "tips". There is a tip selection algorithm doing the tip selection, and normally this algorithm should select transaction that are :

  • recent
  • probably not approved yet

Today, because with a coordinator, we can make a precise distinction between "confirmed" and "approved" transaction :

A transaction is "confirmed" when there is a milestone transaction approving it (directly or indirectly).

A transaction is "approved by at least one transaction" as soon as at least one random transaction is referencing it as "trunk" or "branch".

If you take a long time to approve the tips, it is indeed possible that some other transaction already approved them, or even possible that a milestone transaction already confirmed them (there is one milestone per minute).

There is no real problem with that, except that your transaction may have smaller probability to be approved/confirmed quickly because the tip selection algorithm will select in priority tips approving fresh transactions.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.