Everyone's heard of Bitcoin, but what actually is a "cryptocurrency"? Will this digital money replace the cash in our pockets, and can you get rich quick by buying now, or is the boom already over? We speak to someone who made life-changing sums by investing at the right time, and hear from a senior City investor who says buying Bitcoin is like betting on the horses, only less predictable. Sam and Laura also explain, step-by-step, how to get involved yourself - including a cautionary tale from someone who got seriously burned at the height of the craze. To get in touch, email [email protected] or phone our voicemail number at 07523 039447.   And visit www.telegraph.co.uk/moneypodcast for more   Other useful links:   What is Bitcoin: http://bit.ly/2PQipx9 How to buy Bitcoin: http://bit.ly/2T7nrYn What tax you need to pay on cryptocurrency profits: http://bit.ly/2EJk9XY