I propose that we allow Counterparty.BTC asset issuers to have some of their assets be “grandfathered” in to the counterparty.cash chain.
I propose the following:
For a time period of 1000 BTC blocks, users of Counterparty.BTC can broadcast a special message announcing their intent to issue the asset on counterparty.cash. At the close of the 1000 BTC blocks, the assets will be reserved by the corresponding address on the counterparty.cash chain.
The 1000 BTC blocks time period should end before the Counterparty.BTC burn period.
The reservation must be used on the counterparty.cash chain during the burn period or it will expire and the asset may be issued by any address.
One message must be broadcast per asset reserved. This provides a non-trivial anti-spam fee and encourages the reservation of only assets the owner intends to use.