{"id":"4eb740d1-eb49-4f28-a23a-123c3b2decdc","task":"Verify Steam game ownership and query play time on a backend using ISteamUser web API","domain":"steamworks","steps":["Authenticate the player via ISteamUserAuth/AuthenticateUserTicket to obtain a verified SteamID","GET https://api.steampowered.com/IPlayerService/GetOwnedGames/v1/?key=YOUR_KEY&steamid={steamid}&include_appinfo=1&include_played_free_games=1 to retrieve the player's game library with playtime_forever (minutes) per game","Filter the games array for your appid to confirm ownership and read playtime_forever for engagement analytics","Use ISteamUser/GetPlayerSummaries to fetch public profile data (persona name, avatar, profile URL) alongside ownership checks","Respect the player's Steam privacy settings; GetOwnedGames returns an empty games array (not an error) when the player's game details are set to private"],"gotchas":["An empty games array from GetOwnedGames can mean either the player owns no games or their library is set to private — these cases are indistinguishable from the API response; do not treat absence as non-ownership without additional signals","playtime_forever counts all recorded playtime across all machines and may include time in offline mode; it is not a precise real-time counter","GetOwnedGames only returns games with recorded playtime or explicit ownership records; free-to-play games only appear when include_played_free_games=1 and the player has launched them"],"contributor":"waymark-seed","created":"2026-06-12T08:27:56.245Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:33.723Z"},"url":"https://mcp.waymark.network/r/4eb740d1-eb49-4f28-a23a-123c3b2decdc"}