The server seed is committed before your first spin. Each spin's result comes from the seed pair + an incrementing nonce, so no outcome can be changed after the fact. Rotate the seed any time to reveal it and verify past spins.
Verify: segment = floor(mulberry32(fnv1a(serverSeed + ":" + clientSeed + ":" + nonce))() × 24). Hash the revealed seed with SHA-256 and compare to the commitment shown before those spins.