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The JWS Payload shall contain the following fields:
{
'mtbPublicKeys': [ JWK Object, JWK Object .. JWK Object ], (only new keys, existing keys still in use shall not be listed again)
'removemtbPublicKeys': [ Object with kid, Object with kid .. ], (if no keys are to be removed, this field can be omitted)
}
The JWS shall be formated as JWS compact serialization according to https://tools.ietf.org/html/rfc7515#section-3.1
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