sISK token is issued as a proof when ISK token is deposited in the Governance Staking. As a token separate token from ISK, sISK is issued at the time of staking and burned when unstaked.
sISK serves the following roles in the Iskra Platform:
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First, sISK is an indicator for distributing ISK Staking Rewards, which accounts for 20% of the total ISK issuance. ISK Staking Rewards are distributed according to the amount of sISK held by each staker.
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Second, it will serve as an index for gauging one's influence in governance proposals/votes in the Iskra platform in the future.