ChipMixer works a little different than other btc mixers -instead of merging your Bitcoins with those of other users, they' have developed a system based on chips.
Each time a user deposits Bitcoin, the user receives the equivalent in chips.
The value of each chip is pre-defined and is supported by Bitcoin addresses already set up and pre-financed by ChipMixer.
Once you have received the chips, you can do the following:
You can split big chip into two small ones ie. 0.064 BTC chip into two 0.032 BTC chips.
You can merge two small same-sized chips into big one ie. two 0.032 BTC chips into 0.064 BTC chip.
You can bet a chip to either receive twice as big one or receive nothing. Chance to receive big chip is around 47% and is provably fair.
You can donate a chip to pay for our service. If you only have big chips, you can split them before donating.
Finally, you can withdraw a chip or all chips. This will reveal their private keys you can import into your Bitcoin wallet.
[source:
https://chipmixer.com/faq]
For further details I would recommend to just read the FAQs I linked above.