BAC-L0-FOUND-111
Accounts, transactions and fees
Account model versus UTXO, nonces, fees and priority: the economic machinery that rations scarce block space.
- Level
- L0 — Foundation
- Duration
- 3 h
- Track
- Foundation
- Maintainer
- Developer Curriculum Architect
Learning objectives
- 01Compare the account and UTXO models on the same transfer
- 02Explain the nonce's role against replay
- 03Break down how a transaction fee is computed
Guided lab
Build, sign and broadcast a transaction on a test network, then follow its inclusion.
Independent lab
Deliberately trigger a bad-nonce failure and an underpriced failure, and document both errors.
Security angle
Cross-chain replay: why a transaction valid elsewhere must be rejected here.
Assessment
A transaction included on the test network plus an annotated error log.