Register verification methods

[sbihel]

We need to register the tz1/tz2/tz3 verification methods so we could refer to them satisfying LD-Proofs? E.g., Ed25519PublicKeyBLAKE2BDigestSize20Base58Encoded2020.

It looks to me like the way to register a proof type is to create a specification for it, like https://w3c-ccg.github.io/lds-ed25519-2020/, and then make a PR adding it to security vocab, e.g. w3c-ccg/security-vocab#66

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Related to #49

[wyc]

Some recent feedback:

• Ed25519PublicKeyBLAKE2BDigestSize20Base58Encoded2020 should be renamed to Ed25519PublicKeyBLAKE2BDigestSize20Base58CheckEncoded2020, and should include the public key in the proof object due to EdDSA not supporting a function like ecrecover that can recover the public key from a payload and signature.

[clehner]

I just noticed this: Linked Data Cryptographic Suite Registry / Registration process.

It looks like maybe a more appropriate place for proof/key types. But adding to security-vocab might be good too.

[wyc]

N.B. Let's go with Ed25519PublicKeyBLAKE2BDigestSize20Base58CheckEncoded2021 to avoid confusion.