I'm an individual who is interested to ICOs which are selling ERC20 tokens.
My question is related to an issue that, for most of the ERC20 tokens, the dates of transactions do not fall within the ICO periods.
For example, Blockchain.io sold "BCIO" token during its ICO period which is between 27th Sep 2018 to 25th Oct 2018.
However, the initial transaction of BCIO in etherscan.io here starts from 23rd Nov 2018 which is after the ICO period. (See the last page in the link)
Could anyone please let me know why there are this kind of delays in nearly every transactions of ERC20 tokens? Is there a delay or is etherscan.io not an accurate explorer?
Thank you for your time.