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bitcoin-wallet
This is just my personal fork. For the official repository, please follow the link: (by schildbach)
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InfluxDB
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Overall, it depends on the amounts you play with and how comfortable you are with losing them. I've had Schildbach's OG bitcoin wallet on my android phone for a while, I just carry it over along with its private keys whenever I swap phones. It's nowhere near as safe as what I'm recommending here, but it's basically only holding some play money for those impromptu "bitcoin accepted here" situations.
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