U.S. election laws forbid the creation of a 'receipt' that lists who an individual votes for, because to generate one would allow voters to (provably) 'sell' their vote.
Voting needs to be easier? How is it in any way hard now?
You can register to vote during many ordinary interactions with government (motor voter laws).
People can solicit your registration and deliver it to the government.
The polls in some localities are open for WEEKS because some people's schedules are so onerous they can't find the time in a given 24 hour election to vote.
You can vote by mail via absentee ballot, in most cases the only reason needed is a desire to not go to the polling station.
You can request absentee ballots be sent to you in perpetuity, never requiring you to ask for an absentee ballot again.
Campaigns will drive to your house, pick you up, and deliver you to your polling station if you ask them to.
Campaigns go out and canvass hospitals, mental institutions, and even prisons to 'dig up' voters that can't make it to the polls.
You can register to vote on Election Day in many localities... No waiting period.
And you don't even need to remember to bring ID to the polls, unless you live in one of the two dozen or so states that require state-issued ID to vote.
Where is the onerous burden that Bitcoin-based online voting addresses that is not equally-well addressed by the current absentee ballot programs across the country?