How to check vaild transaction or not

Hello @ans1607607496,

Thank you for your interest in Samsung Blockchain SDKs.
The goal of Samsung Blockchain SDKs is to help Samsung Developers to develop their Blockchain mobile Dapp more easily. Samsung does not provide any cryptocurrency exchange service. You can try out services like Coinbase to convert your Bitcoin into other currencies.

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Best Regards,
Shuvo
Samsung Developer Program