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Collect and Release
We do not say buy and sell because those words imply a market with price discovery.
Collect: you send SOL to the launch reserve, receive tokens at the fixed rate. A 1% fee applies (0.7% to the creator, 0.3% to JustCoinLab). The reserve grows by the cost amount.
Release: you return tokens to the vault, receive SOL from the reserve at the same fixed rate. No fee. The reserve shrinks by exactly the refund amount.
The reserve invariant: at all times, reserve_lamports = tokens_sold × 1 (plus the rent floor which is not accessible).
This means release is always available at cost, subject only to: you holding the tokens, and the reserve having the lamports (which it always will, by invariant).