Just updated, it was a mistake on my end, thanks for the great service Jack!

has this been resolved yet? @xdeath223 can you check if the key is 52 chars length
I just experienced something similar and turned out I copied incomplete key, left out 3 chars
your issue may be the same... and can be solved by brute forcing the last few chars of that PK

The keys are presented in WIF... Wallet Import Format

So, as per the documentation, the first 4 bytes of the "double SHA256" is used as a checksum and appended to the "address type + hex privkey (+ optional compressed key identifier)" before being converted to a Base58 string using Base58Check encoding

However, the maths involved in the conversion from Base58Check mean that ALL the characters are required to convert the Base58 string back to the correct bytes. For a demonstration, go here: http://gobittest.appspot.com/PrivateKey and in box #1, just delete the last character and click send... watch how the byte array in #2 changes

It was resolved - private key saved by user was shorter but it was easy to find missing characters.

If you do not import private keys while session is active - please save receipt. It contains all information you need to use your chips and since it is signed by ChipMixer - you can prove you received them from us or file scam report if you received invalid key and we did not solve your problem.

Your session should last 168 hours (7 days) from the moment you created or extended it.

A PM won't be answered faster than email:

Still no reply to email

does anyone know another way to contact chipmix admin?

You're not being scammed. First of all, the website says this:
It's your own responsibility to keep track of your session token.

That being said: all similar cases have been resolved by ChipMixer, and I expect them to resolve this case too.
Unfortunately, ChipMixer support isn't very fast. Since it's been 4 days, I recommend to send them another email.

I’m guessing they don’t have the session token as, if they do, it’s quite easy to restore the session.

Ahh, nope, it’s even simpler.

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If support don’t tell you this, if you put in your token and it takes you straight to step 1 where it awaits a deposit, that means there are no chips left but there are private keys so you need to click for step 4 at the top in order to get your private keys/voucher codes.

Alternatively, if you haven’t previously done the chip selection part then you will be immediately taken to step 2 where you can split/merge/donate chips.