Arcium Program Development

Use this skill to implement and debug Arcium computations end-to-end with strict contracts across Arcis circuits, Anchor program wiring, callback verification, and client/test encryption flow.

Decision Tree (Task Classification)

Classify the request before editing code:

1. Stateless computation (e.g., Coinflip)

• No persistent encrypted state account update.
• Usually one encrypted input and one revealed/encrypted output.
• Read first: references/implementation-playbook.md, references/callback-output-shapes.md.

2. Stateful encrypted account flow (e.g., Voting, Sealed Bid, Blackjack)

• Requires .account(pubkey, offset, len) with exact byte layout.
• Usually callback writes ciphertext + nonce to account state.
• Read first: references/account-layout-offsets.md, references/implementation-playbook.md.