is someone there who knows how the en-/decoding of the optOt-URL is implemented ?
I'd assume that the part "817b324557dc9cb9" is the encoded contact_id 15944 ???
Please help me ;-) Thanks a lot and kind regards Dieter
p.s.: https://gchq.github.io/CyberChef/ => Analyse hash: 817b324557dc9cb9 Hash length: 16 Byte length: 8 Bit length: 64
Based on the length, this hash could have been generated by one of the following hashing functions: CRC-64 RIPEMD-64 SipHash