Staff says node-related keys cannot be sold

Azarak asked where a node could be sold. Dhruv│Xai replied that the keys were soulbounded and non-transferable, so they could not be sold.

After Azarak asked whether that also covered fracture ones, Dhruv│Xai clarified that tiny keys were also soulbounded and could not be sold. The exchange concerns transfer limits for these keys, not liquid XAI or a market price.