League of Legends Esports' Global Contracts Database (GCD) lists all updates for players under contracts with organisations part of a competitive circuit accredited by the game's publisher: Riot Games. Information on the end date of players' contracts, their residency status and a contact for each team is catalogued.
Any data available on this link is therefore considered official. However, some minor leagues are not accessible as they are not all eligible for inclusion in the GCD.
As specified by Riot Games, they must meet certain conditions in order to appear as accredited by the publisher. This is why some leagues may be added in the future and others removed depending on whether or not this accreditation is obtained.
