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?
put on hold as off-topic by Andrew Chow♦ 15 hours ago
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "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