Why Zold is cheaper?

See #2, release log:

• 05c6a99 by @yegor256: #2 fix
• d189802 by @yegor256: #2 fix
• 0e0128a by @yegor256: #2 more
• 6807af5 by @yegor256: #2 prices explained a bit
• 65df2b9 by @yegor256: #4 more text
• f5561d9 by @yegor256: #13 protocol explained
• b7d72aa by @yegor256: typo
• 7078842 by @yegor256: fixed
• 707a013 by @yegor256: hashgraph
• 0a4b24a by @yegor256: #5 strength explained

Released by Rultor 1.67.4, see build log