{"action":"opened","issue":{"url":"https://api.github.com/repos/dedis/cothority/issues/1045","repository_url":"https://api.github.com/repos/dedis/cothority","labels_url":"https://api.github.com/repos/dedis/cothority/issues/1045/labels{/name}","comments_url":"https://api.github.com/repos/dedis/cothority/issues/1045/comments","events_url":"https://api.github.com/repos/dedis/cothority/issues/1045/events","html_url":"https://github.com/dedis/cothority/issues/1045","id":295812507,"number":1045,"title":"Roster change can make backlinks impossible","user":{"login":"jeffallen","id":1131456,"avatar_url":"https://avatars2.githubusercontent.com/u/1131456?v=4","gravatar_id":"","url":"https://api.github.com/users/jeffallen","html_url":"https://github.com/jeffallen","followers_url":"https://api.github.com/users/jeffallen/followers","following_url":"https://api.github.com/users/jeffallen/following{/other_user}","gists_url":"https://api.github.com/users/jeffallen/gists{/gist_id}","starred_url":"https://api.github.com/users/jeffallen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jeffallen/subscriptions","organizations_url":"https://api.github.com/users/jeffallen/orgs","repos_url":"https://api.github.com/users/jeffallen/repos","events_url":"https://api.github.com/users/jeffallen/events{/privacy}","received_events_url":"https://api.github.com/users/jeffallen/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-02-09T09:53:06Z","updated_at":"2018-02-09T09:53:06Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"Consider TestClient_GetUpdateChain. It makes a skipchain that jumps from server to server, with each block getting a new roster. With base =1 maxheight =1, this works.\r\n\r\nBut if you change to this:\r\n```\r\n\tsbs[0], err = makeGenesisRosterArgs(s, onet.NewRoster(roster.List[0:2]),\r\n\t\tnil, VerificationNone, 3, 2)\r\n```\r\n\r\nIt fails with \"Didn't find convenient SkipBlock for height 1\" because the new lead server at that point does not have the block with index-3 in it's local DB.\r\n\r\n"}}
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