Update Peter Rizun's subchains paper
Update Peter Rizun's subchains paper

thofmann/BitcoinUnlimitedWeb,sinahab/BitcoinUnlimitedWeb,gandrewstone/BitcoinUnlimitedWeb,BitcoinUnlimited/BitcoinUnlimitedWeb,sinahab/BitcoinUnlimitedWeb,gandrewstone/BitcoinUnlimitedWeb,thofmann/BitcoinUnlimitedWeb,BitcoinUnlimited/BitcoinUnlimitedWeb,BitcoinUnlimited/BitcoinUnlimitedWeb