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Tokens are mapped using chain code and token code. This allows the FIO Handle to be mapped to different public address, even for tokens on the same chain.
FIO Foundation publishes coding standard to ensure all clients use the same codes. Over 6,000 tokens have been standardize, but anyone can add new codes as they are launched.
FIO Handle can also be mapped at the chain level, ensuring every current and future token code is mapped to a single FIO Handle.
Mappings support uri parameters in the public address, which enables the transaction to include additional parameters, such as memo or destination tag.
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Technical details: https://developers.fioprotocol.io/docs/integration-guide/handle-mapping
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