Includes: £40 voucher It's the first-ever Crypto Voucher, redeemable to BTC ! Purchase a voucher in one of the available denominations (with price depending on the current exchange rate). Next, redeem it on cryptovoucher.io and add BTC to your wallet. It's fast, simple and secure! Bitcoin is a digital currency used for fast, secure and low cost payments without the need for a central issuer or processor. Bitcoins are stored and sent electronically from private wallets. Introduced in 2009, bitcoins have increased greatly in value due to their limited supply and growing popularity.