How do you define a swing high that you would trust as resistance on a crypto chart?

Before drawing a horizontal level, many chart readers first agree on what counts as a swing high. Some use a simple rule, such as a candle whose high is above the highs of the surrounding bars on each side. Others use a percentage move filter so that minor wiggles in a volatile market don't create levels everywhere. The reason this matters is that a level is only as useful as its definition. A swing high drawn on a one-hour chart can sit inside a daily range and mean very little, while one that held as a ceiling across several daily closes carries more weight in the structure. Timeframe alignment is a common way people try to separate the two. I'm curious how others approach this in practice. What rule do you use to decide that a swing point is significant enough to watch, and what would make you stop treating it as valid?