Proof Engine Verification: Dark energy constitutes more than 68% of the universe's total energy density according to the Planck 2018 legacy release.

Verdict: PROVED (with unverified citations) - The Planck 2018 legacy release reports a dark energy density parameter of **ΩΛ = 0.6853 ± 0.0074** in the base-ΛCDM model, corresponding to **68.53%** of the universe's total energy density. - This value exceeds the 68% threshold stated in the claim: **0.6853 > 0.68**. - An independent derivation from the matter density parameter (Ωm = 0.315 ± 0.007) yields ΩΛ = 1 − Ωm = 0.685, consistent with the directly reported value (relative difference < 0.05%). - No revisions, errata, or retractions aff