I was reading about [Rai Stones](https://en.wikipedia.org/wiki/Rai_stones) last night, an ancient form of currency used on the Micronesian island of Yap. They are huge coins carved from limestone and littered across the island and bizarrely they have a lot in common with digital currency.
Like digital currency, the stones depend on a public, community ledger system. Not blockchain, in the case of rai, but an oral ledger passed down from generation to generation. Given the size of the stones, they were rarely moved, but were gifted or exchanged. So an owner might not live nearby the stone but ownership would still be established thanks to the oral ledger.
Guessing this will already be known by many here as it must be the inspiration for the original name of Nano – ‘Rai-Blocks’, but it was new to me so I thought others might appreciate it.
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