Verifies a Rekor signed entry timestamp: cosign's VerifySET().
{ body, integratedTime, logIndex, logID }
the signed entry timestamp's bytes
the trusted Rekor logs [{ logIdHex, spki }]
[{ logIdHex, spki }]
a promise of empty when it verifies, otherwise why not
Verifies a Rekor signed entry timestamp: cosign's VerifySET().