【安全加密】拍卖行恶意抬价的识别：出价图谱与关联账号

---出价的关联画像
function AuctionBid.profile(lotId)
    local bids = auctionLots[lotId].bidHistory
    local links = {}
    for i = 2, #bids do
        local pair = bids[i - 1].from .. ">" .. bids[i].from
        links[pair] = (links[pair] or 0) + 1
    end
    return links
end

function AuctionBid.detect(lotId)
    local links = AuctionBid.profile(lotId)
    local total = #auctionLots[lotId].bidHistory
    for pair, count in pairs(links) do
        if count >= 6 and count / total > 0.5 then
            local a, b = pair:match("^(.-)>(.+)$")
            QF_RiskAlarm("疑似互相抬价", lotId, a, b)
            return true
        end
    end
    return false
end