If you’re a holder of Aeternity (æternity) (AE) token (Currently on the Ethereum Blockchain as an ERC20 token), then you will need to be aware of their mainnet launch and migration details. So in laymen’s terms its a process to move tokens out of the Ethereum blockchain into Aeternity’s own blockchain.
There are four stages of this migration so make sure if you hold any Aeternity then you need to follow the migration process within the time. The last phase ends on 19th September 2019.
The current options for setting up the æternity wallet are
AirGap vault (App store pending), Ledger nano S, æternity Base æpp and æternity CLI ( advanced users)
A comprehensive guide to the migration of AE can be found on Aeternity’s own medium post here: https://blog.aeternity.com/be-part-of-æternitys-mainnet-launch-ae-token-migration-2a5d3e33ea64