We are given a stream of binary data that we must somehow decode. We eventually worked out that it used Manchester Coding.
0110101001010101011010010101011001101001010110100110101001100101 0110100101101001011010101001101001101010010101010110100110010101 0101101001100101011010100101101001100101011001100101100110100110 0110100101100110011010011010100101101001010110100101101001010101 0110100101100101010110100101011001101001101010010110100101101010 0101100110100110011001100101010101100101011001100110101010100110
We can use an online decoder (such as this) to decode it, we are then left with:
011100000110000101100011011101000110011001111011011100000110100000110100011100110100010100101101011001010110111001100011001100000110010000110001011011100110011100101101010100000100010101111101
We can then decode this from binary in CyberChef into ASCII and this gives us the flag:
Flag: pactf{ph4sE-enc0d1ng-PE}