tech_how_to_check_a_ballot_is_valid.md

layout	permalink
post	/how-to-check-a-ballot-is-valid/

---

How to check a ballot is valid

A node must validate the ballot with transactions from proposer(Please refer to How the consensus protocol works). This is because only valid ballot must be agreed and confirmed.

Ballot Structure

When a ballot is made by the proposer, it has valid transactions.

Received Ballot Validation

A ballot is valid if all transactions are passed the validation check by itself.

Transaction Validation

A transaction is valid if,

1. it has valid checkpoint,
2. the source account has enough balance to pay for the transaction and
3. it's Operations are valid