Can I use this library for any blockchain?

[thomas-tran]

Can I use this library for any blockchain technologies or I will only be used in Ethereum blockchain type?

[kdenhartog]

Technically the design of this library should allow you to use it with any sort of key based service - so not only blockchains. However, key management isn't involved at this point so you will need to figure out how to securely store keys still. Additionally this library assumes the use of Ed25519 keys only as well so unless the blockchain uses Ed25519 keys you likely won't find it practically useful at this point either.