# Identifying External Coin (Fungible token) in smart contract

**URL:** <https://forums.sui.io/t/identifying-external-coin-fungible-token-in-smart-contract/48083>\
**Category:** Technical Support\
**Created:** [April 28, 2025, 11:08pm UTC](https://forums.sui.io/t/identifying-external-coin-fungible-token-in-smart-contract/48083 "2025-04-28T23:08:56Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![wjddbstjr03](https://avatars.discourse-cdn.com/v4/letter/w/e56c9b/32.png) [@wjddbstjr03](https://forums.sui.io/u/wjddbstjr03)\
**Post date:** [April 28, 2025, 11:08pm UTC](https://forums.sui.io/t/identifying-external-coin-fungible-token-in-smart-contract/48083/1 "2025-04-28T23:08:56Z")

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Hi, I’m very new to Sui.  
How can I identify a certain coin in my Move smart contract? For example in Solana, I can accomplish it by just using constant 32 bytes public key but it seems much more difficult in Sui.  
Please illustrate with LBTC as example.  
I can find LBTC in Suiscan mainnet is identified as `0x3e8e9423d80e1774a7ca128fccd8bf5f1f7753be658c5e645929037f7c819040::lbtc::LBTC` and also find git repo in `https://github.com/lombard-finance/sui-move-contracts`.