{"action":"opened","number":558,"pull_request":{"url":"https://api.github.com/repos/JoinMarket-Org/joinmarket/pulls/558","id":72602890,"html_url":"https://github.com/JoinMarket-Org/joinmarket/pull/558","diff_url":"https://github.com/JoinMarket-Org/joinmarket/pull/558.diff","patch_url":"https://github.com/JoinMarket-Org/joinmarket/pull/558.patch","issue_url":"https://api.github.com/repos/JoinMarket-Org/joinmarket/issues/558","number":558,"state":"open","locked":false,"title":"sendpayment/tumbler: increase default maker count","user":{"login":"AlexCato","id":19202406,"avatar_url":"https://avatars.githubusercontent.com/u/19202406?v=3","gravatar_id":"","url":"https://api.github.com/users/AlexCato","html_url":"https://github.com/AlexCato","followers_url":"https://api.github.com/users/AlexCato/followers","following_url":"https://api.github.com/users/AlexCato/following{/other_user}","gists_url":"https://api.github.com/users/AlexCato/gists{/gist_id}","starred_url":"https://api.github.com/users/AlexCato/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/AlexCato/subscriptions","organizations_url":"https://api.github.com/users/AlexCato/orgs","repos_url":"https://api.github.com/users/AlexCato/repos","events_url":"https://api.github.com/users/AlexCato/events{/privacy}","received_events_url":"https://api.github.com/users/AlexCato/received_events","type":"User","site_admin":false},"body":"I propose a change of the default maker count from 2-4 to 4-6 (sendpayment) and from median 3 with stdev 1.5 to median 5 with stdev 1.5 (tumbler).\r\n\r\nReasoning:\r\nThe first research about JoinMarket ([Join Me on a Market for Anonymity](http://weis2016.econinfosec.org/wp-content/uploads/sites/2/2016/05/WEIS_2016_paper_58.pdf)) has shown that it is possible to increase the costs of a sybil attacker significantly by increasing the maker count, see Table 1 and Table 2 in the paper.\r\n\r\nThis could already be achieved by takers if they use their preferred maker count. Users use joinmarket as taker in search for anonymity for their coins. As many user do not change default values, the default should be set to a more secure value (see Figure 5 in that paper; data from when the default was still N=2). 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