There won’t be unsold tokens. The tokens are generated depending on the amount of interest received. This means that if there is little interest and you participate, you will own a larger proportion of the total tokens. If you participate and there is a high interest in the sale, then you still own the same amount of tokens and a smaller part of the total amount.
During the token sale, for each token sold there will be a corresponding amount of token kept by the IOV company, for future operation of the blockchain and business purposes. All the details are in the Token Sale document.
After the end of the Token Sale, 65% of the tokens will have been sold and 35% will have been kept by the IOV company, including a reserve.