To know how much balance a user has on the bitcoin blockchain you just need to look at their UTXOs. To do the same in Ethereum you just look at their accounts. Are there any other systems used by notable blockchains?

closed as off-topic by Andrew Chow Jul 17 at 17:24

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  • "Questions about cryptocurrencies or projects that are not Bitcoin, and are not applicable to Bitcoin, are off-topic. For more information, see this meta-discussion." – Andrew Chow
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  • Sorry if this isn't the right place to post the question, but I'm not sure where to post blockchain-generic questions. – Reinstate Monica Jan 29 at 16:36