Zcash transactions come with a kind of finality which protects the users as much as possible against all possible attacks, and is sufficient for services such as cross-chain bridges and centralized exchanges.

[shielded-nate]

Prerequisites:

• Prototype node API includes finality status fields for transactions and blocks. #39
• Prototype node API includes new "finality"-specific APIs #40
• Prototype node API provides an interface for querying all things about PoS. #41
• "Why we believe Crosslink is safe" has a finality section #42

[shielded-nate]

We should be more precise than "all possible attacks" because introducing finality in the first place enables denial-of-service attacks.

The kinds of attacks finality protects against are rollback attacks, double/multi spends, and certain kinds of eclipse attacks. (T/F?)

[shielded-nate]

Responding to myself from last comment: we still protect as much as possible against denial-of-service attacks, even though finalizing protocols introduce a new kind of DoS vector.

[shielded-nate]

Is #41 actually a prerequisite for this ticket?