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tiny-secp256k1 and ECDSA signing determinism

Started by Bitcoin, Feb 19, 2022, 06:11 am

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tiny-secp256k1 and ECDSA signing determinism

I noticed in bitcoin when using the tiny-secp256k1 library to sign the signature for a signature hash of an input; the signature is always the same.


However, the signature is always different in other ECDSA-Secp256k1 libraries. (I'm using one by nordic semiconductors.)


Do I misunderstand something? Is there a difference in the signature algorithms?


I read something about randomly and deterministically calculating the k value; should it matter if it is random or not? Or is there possibly extra encoding done after the signature hash is signed in Bitcoin Secp256k1?


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