What are additive addresses in Kaspa?

Additive addresses are a proposed Kaspa feature that allows a UTXO to be spent only when value is being added to it, enabling auto-compounding behavior. In Kaspa, a UTXO (unspent transaction output) is essentially your spendable coin — normally spending one means consuming it entirely. Additive addresses flip that by enforcing a rule: a transaction touching that address must add value, not just drain it. This makes them well-suited to wallets or contracts that should only ever grow in balance. For a beginner, the practical takeaway is that certain Kaspa addresses could be designed to automatically compound funds, all without requiring changes to the core network rules.