Quote from: saerlingen on August 07, 2018, 12:36:16 PM

Seems like a cool idea.

the private keys are still gonna be exposed to your software right? or does the contract make it trustless?

Service uses split-key address generation scheme: https://en.bitcoin.it/wiki/Split-key_vanity_address

1. You create Secret Private Key for yourself, produce User Public Key for it
2. Create task in smart contract and provide User Public Key with task
3. Miners generate Answer Private Keys => produce Answer Public Keys, add to your User Public Key, and produce Bitcoin address (until found desired)
4. Lucky miner submits solution (Answer Private Key) to smart contract
5. Smart contract computes Answer Public Key, adds to stored User Public Key, produces Bitcoin address, matches pattern, pays to miner
6. Users gets Answer Private Key from miner via smart contract, adds it to own Secret Private Key and uses Resulting Private Key safely.