The most secure method when SAFE launches, and reaches critical mass (IMO):
Step 1: Sell all your blockchain based digital assets.
Step 2: Buy the SAFE coin.
Step 3: (Optional) Buy other tokens based on SAFE Network datatypes, like AppendableImmutableData, etc.
That might work for an individual, but I’m interested in being able to lock up other blockchain assets on the Safe network as collateral for lending against, and as an easy way for people to use non-Safe tokens on the Safe network ahead of mass-migration from other platforms to the Safe Network.
Eventually I’m sure most tokens will migrate to the Safe Network if the network performs as expected (due to low fees, high security, and rapid performance), but ahead of that, it’d be great to be able to build services on the Safe network that can leverage the value of highly liquid non-Safe based assets.
So far on other block chains, I believe this has been accomplished by running an on chain light client of the other chain where the collateral will be locked up. When the light client sees this, the contract on the new chain can then issue the corresponding tokens or credit on the new chain.
Of course the more basic approach is to have some third party (or collection of people via multi-sig) custody the assets on chain A and do the issuance on chain B. This isn’t trustless though.