Worth noting that the 10 and 7 are double ChaCha rounds, which means that the strength of BLAKE3's bit diffusion is closer to ChaCha14 than ChaCha7. Given that

Worth noting that the 10 and 7 are double ChaCha rounds, which means that the strength of BLAKE3's bit diffusion is closer to ChaCha14 than ChaCha7. Given that the best attack against ChaCha fails to break ChaCha8, it's reasonable to conclude that BLAKE3 is secure.