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The JWS Payload shall contain the following fields:
{
'mtbPublicKeysaddMtbPublicKeys': [ JWK Object, JWK Object .. JWK Object ], (only new keys, existing keys still in use shall not be listed again)
'removemtbPublicKeysdelMtbPublicKeys': [ JWK Object kid, JWK Object kid .. JWK Object kid] (if no keys are to be removed, this field can be omitted)}
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