How to store cryptocurrency balance without causing floating point errors in ruby rails

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I'm creating a rails app where users will have an account balance in Ethereum and possibly other cryptocurrencies. Currently, I am storing the user's balance as afloat. This, however, is a really bad approach as cryptocurrencies are usually divisible down to 8 digits so any floating-point error will cause a huge loss/gain in funds. How can I store the user's balance (what datatype should I use) so as to not cause floating-point errors? Thanks
Apr 5, 2022 in Blockchain by Rahul
• 9,670 points
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1 answer to this question.

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 I suggest storing the values as integers. Just multiply the currency values by a million or so when you store them and convert them as needed in your application.Ruby has a special class for this:

BigDecimal -> https://ruby-doc.org/stdlib-2.4.0/libdoc/bigdecimal/rdoc/BigDecimal.html

answered Apr 7, 2022 by Aditya
• 7,680 points

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