(V3) Verifier: I got an error "Buffer is not defined"

Hi community,

I made the following VC as Blockcerts V3 schema using cert-issuer==3.0.1.
I used did:web for issuer’s did and made a transaction on Ethereum Ropsten.

After then, I tried to verify the generated VC on my local verifier and https://www.blockcerts.org/.
I got an error “Buffer is not defined” like this.

Deriving Issuing Address from Public Key
Buffer is not defined

Could you help to let me know what wrong with it?

I opened the following PR.
Could you check?

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