The concept you&#x27;re describing is called a &quot;smart contract.&quot; There isn&#x27;t a second blockchain, but the transaction itself specifies conditions that must arise before the funds move.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Smart_contract" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Smart_contract</a><p>And for a cryptocurrency-specific implementation, see <a href="http:&#x2F;&#x2F;nashx.com&#x2F;HowItWorks" rel="nofollow">http:&#x2F;&#x2F;nashx.com&#x2F;HowItWorks</a>