@transmute/x25519-key-pair/src/types/X25519KeyAgreementKey2019.ts

``` npm i @transmute/x25519-key-pair@latest --save ```

export interface X25519KeyAgreementKey2019 {
  id: string;
  type: 'X25519KeyAgreementKey2019';
  controller: string;
  publicKeyBase58: string;
  privateKeyBase58?: string;
}