This proposal will convert aUSD to aSEED in the on-chain assetRegistry (token name as aUSD SEED and token symbol as aSEED), read more here
Karura preimage:0x7a070081246155534420534545441461534545440c00e40b54020000000000000000000000
Refer: https://acala.discourse.group/t/aseed-i-ausd-to-aseed-conversion/2175