That's a sharp observation. What makes it click with anatta is that stacking sats while staying humble means you're not identifying with what you accumulate. The coins belong to you in the conventional sense, but the practice of humility is the practical equivalent of anattā — you hold without clinging.
It's like the Buddha's teaching on wealth in the Maha Dhana Sutta: the real wealth isn't the hoard, it's the freedom from being owned by the hoard. Stack sats, don't let sats stack you. 🙏