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We have implemented a smart contract using Bitcoin script that implements a fixed annuity, a traditional financial planning tool for high net worth individuals. The smart contract, once set up, is immune to any fraud and is completely transparent, operating entirely on the Bitcoin blockchain. We have also implemented a web service with an attractive user interface to easily create the smart contract on behalf of a normal user. The web service can automatically submit the contract components to the Bitcoin network at the appropriate time, but even if the service goes down, the user or anyone else can submit the contract himself from a downloaded backup provided by the website. We have also implemented a time lock vault which can be used independently or to secure annuity seed capital during initial setup. Future work would include subscription payments and assured cross-blockchain asset trading.

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