Removes KAVA rewards for USDX minters and redirects those rewards to Hard protocol.

1. Parameter change cosmos.params.v1beta1

   {
       "@type": "/cosmos.gov.v1.MsgExecLegacyContent",
       "content": {
           "@type": "/cosmos.params.v1beta1.ParameterChangeProposal",
           "title": "Removes KAVA rewards for USDX minters and redirects those rewards to Hard protocol.",
           "changes": [
               {
                   "key": "HardSupplyRewardPeriods",
                   "value": "[{\"active\":true,\"collateral_type\":\"usdx\",\"start\":\"2020-10-16T14:00:00Z\",\"end\":\"2024-10-16T14:00:00Z\",\"rewards_per_second… (1,145 characters)",
                   "subspace": "incentive"
               },
               {
                   "key": "USDXMintingRewardPeriods",
                   "value": "[]",
                   "subspace": "incentive"
               }
           ],
           "description": "This proposal removes KAVA rewards given to USDX minters and redirects those rewards to suppliers to Hard protocol. Total KAVA rewards to USDX suppliers to Hard protocol are equal to 270,100 KAVA per week. For further information, see https://medium.com/kava-labs/kava-reward-updates-bffa64b88230"
       },
       "authority": "kava10d07y265gmmuvt4z0w9aw880jnsr700jxh8cq5"
   }

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