Are you going to work with fiat at any point? Crypto is good and all, but its hard to imagine people using BTC or ETH to make donations. I mean, these funds would need more accepted kinds of currencies to make any use of these donations.
Our participants are free to make donations in any currency that they are comfortable spending the money in. The donor may transfer the money in the desired currency to the recipient using the built-in currency conversion instrument on the Humancoin platform.