The Core Team tokens have a four-year vesting period, meaning that the tokens are locked up for four years and can only be unlocked and used after that time period. This is designed to ensure that the Core Team is incentivized to remain with the project and to continue to contribute to its success over the long term. The vesting period also provides a degree of stability to the project, as it helps to avoid a situation in which the Core Team would be tempted to dump their tokens on the market as soon as they are unlocked. This would be damaging to the project and its token holders, as it could cause a large drop in the token's value.