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The Recent Increase In Reported Incidents Of Surveillance And Security Breaches Compromising Users' Privacy Call Into Question The Current Model, In Which Third-parties Collect And Control Massive Amounts Of Personal Data. Bit Coin Has Demonstrated In The Financial Space That Trusted, Auditable Computing Is Possible Using A Decentralized Network Of Peers Accompanied By A Public Ledger. In This Paper, We Describe A Decentralized Personal Data Management System That Ensures Users Own And Control Their Data. We Implement A Protocol That Turns A Block Chain Into An Automated Access-control Manager That Does Not Require Trust In A Third Party. Unlike Bit Coin, Transactions In Our System Are Not Strictly Financial -- They Are Used To Carry Instructions, Such As Storing, Querying And Sharing Data. Finally, We Discuss Possible Future Extensions To Block Chains That Could Harness Them Into A Well-rounded Solution For Trusted Computing Problems In Society.