证明者

attestor; certifier; demonstrator; voucher
【法】 attestor; certifier; justifier; prover; testifier; vindicator

1.verifier  2.testifier  

证明的英语翻译：

prove; certify; argue; demonstrate; justify; manifest; testify; vouch
【计】 proofness; proving
【化】 proofing
【医】 certificate; certify; proof
【经】 attest; attestation; authenticated; authentication; certification
certify; testimony

者的英语翻译：

person; this