jmL×BlockGuess Using the hash of the BCH block and the random number of random.org, the algorithm is open source and all operation can be found in blockchain https://twitter.com/blockguessfun/status/1105729606986797056
https://whatsonchain.com/tx/52684011055cc948e858e5e5889e284be6694fcae6f7bc582ec0214edf075392