proof is a JWS by the new key over{sessionId, from, to} (the two thumbprints). A new session carries oncurl --location 'https://api.prod-orm.io/security/klock/sessions//rotate' \
--header 'Content-Type: application/json' \
--data '{
"devicePub": "string",
"proof": "string",
"sealPub": "string",
"sealBinding": "string"
}'{
"sessionId": "string",
"rotatedFrom": "string",
"grant": "string",
"grantSeq": 0,
"deviceCert": "string",
"checkInBy": 0,
"exp": 0,
"oldSessionEndsAt": "2019-08-24T14:15:22.123Z"
}