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Elements allow for assets issuance, and I was wondering what was the limit to the number of units that we can issue for each asset.

There's a limit to the amount that can be issued each time, which is 21 millions, but it seems that by issuing 21 millions again and again I can issue much more than that.

My guess is that the max amount that could be issued is the maximum number of satoshis that can fit in a int64_t, which should be 92,233,720,368.54775807, am I getting this right?

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There is no maximum that can be created, however you may run into issues with RPC-APIs in Elements if any wallet contains more than 92,233,720,368.54775807 at any time.

Confidential transactions will function with any realistic amount (you would have to re-issue an asset more times than possible to overload the 256-bit confidential amount type, however the receivers wallet would fail if int64 overflows.

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  • If I remember correctly, confidential transactions do have a limit of its own though, but it is not a problem since it is impossible to make a transaction with an output bigger than 21 millions. Each issuance being a transaction itself limited to 21 millions, there's indeed no problem doing confidential asset issuances
    – Sosthène
    Commented Sep 24, 2020 at 9:31

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