Are existing Kaspa scripts and addresses affected by KIP-0010?

Existing Kaspa scripts and addresses remain valid after KIP-0010 activates — nothing already on-chain breaks. KIP-0010 adds new opcodes (instructions that scripts can execute) to Kaspa's scripting language, but it does not remove or change any existing ones. The catch is that older scripts cannot use the new functionality unless they are rewritten to include the new opcodes. For most users who simply hold or transfer KAS, this change is invisible; it primarily matters to developers building more advanced transaction logic on Kaspa.