What genesis block hash algorithm does ardor use?

Not the consensus algorithm but the algorithm used to produce the genesis block hash...

SHA-256 is used everywhere a cryptographic hash is required, except in the by-hash voting and the currency minting where the algorithm can be selected by the user.

Particularly here is how the genesis hash is calculated: https://bitbucket.org/Jelurida/ardor/src/6d3c346571c93ca6b2717b5412537bb3802cb610/src/java/nxt/blockchain/Genesis.java#lines-59

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Thank you! Do you also know the unit multiplier for Ardor? Multiplier that is used to map from the unit of value stored on the distributed ledger to the unit of value associated with the digital token long name.

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The multiplier is 10^8. See here for more details -> General notes

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