Users need to agree on an identifier to set their addresses to a specific asset. At the moment, there are several efforts to standardise asset identifiers. We suggest this list to start.
In order for a starname to accept a specific crypto-currency, you need set the uri field. The uri field in the format: "asset:" + asset_ticker
You should pick asset_ticker from the Asset Ticker Reference Table below and asset_ticker should be always lowercase in the uri field.
For exemple, to declare your Bitcoin address, you can set the uri to asset:btc in your name (the uri is stored in lowercase)