Ideally, the payments made by electricity buyers towards the power purchase agreement would also be recorded on the blockchain so that a clear path can be drawn between kWh generated, token minted, power consumed, and then paid for by the user - proving not only the solar electricity backing, but also (and more importantly) the USD cash equivalent value of that electricity. Even better if the power purchase agreement itself was a smart contract. Steps 1-3, from power generated to power consumed can be tracked and implemented on the digital ledger. Local currency regulations will determine the extent to which the entire process can occur digitally. Most countries in which we plan to operate will likely require payments made by energy buyers to be manually onramped in order to provide blockchain record of purchase transaction. But regardless of the specific mechanics, proof of electricity generation and customer payment can be provided in a trustless manner so that project status and actual backing of each minted token can be verified.