Qtum

<h3 id="what-is-taproot-exactly">What is Taproot exactly?</h3><p><a href="https://taproot.watch/about" rel="noopener noreferrer nofollow">Taproot</a> was one of the most significant upgrades that the Bitcoin blockchain had been through since the SegWit (Segregated Witness) fork. It incorporates three Bitcoin Improvement Proposals (BIPs):  <a href="https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki" rel="noopener noreferrer nofollow">BIP340</a> (BIP – Schnorr), <a href="https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki" rel="noopener noreferrer nofollow">BIP341</a> (BIP – Taproot), <a href="https://github.com/bitcoin/bips/blob/master/bip-0342.mediawiki" rel="noopener noreferrer nofollow">BIP342</a> (BIP – Tapscript). Through Taproot, Bitcoin can execute smart contracts, but it also brings in incredible robustness in the form of Schnorr signatures that are more efficient than ECDSA (Elliptic Curve Digital Signature Algorithm) signatures. All this can pave the way to Bitcoin DeFi. On 21st June 2021, Bitcoin miners signaled their support for Taproot. The upgrade officially happened via a soft fork at block 709,632 on 14th November 2021.</p><h3 id="why-qtum-implementing-taproot-is-a-big-deal">Why Qtum implementing Taproot is a big deal</h3><p>By opting for a UTXO-based EVM platform, Qtum has adopted one of the most complex yet flexible blockchain architectures. It is flexible since Qtum users can benefit from both Bitcoin and Ethereum upgrades. However, it is complicated since all Ethereum upgrades must be incorporated in a UTXO-compatible scenario, while all Bitcoin updates must be deployed in an EVM system.</p><p>This is doubly challenging for a complicated update like Taproot. It is a testament to Qtum’s core devs that they were able to deploy such a complex Bitcoin-based update in EVM’s ecosystem. This feat of engineering excellence will open the doors for unprecedented development potential on Qtum.</p><p>Here is the <a href="https://qtum.info/tx/0381c69f634fac1c4ade43fc274e4d0ce7e6159a3103fd7a2116a5b3fee2b128" rel="noopener noreferrer nofollow">first ever taproot transaction</a> on Qtum. Here is the <a href="https://qtum.info/tx/d027b747ddf59a6dadf9da4792c31296f6a920a59eb0b3fc678e4710a395994d" rel="noopener noreferrer nofollow">first-ever QTUM</a> spent using taproot. Due to the delicate nature of the update, Qtum had carefully monitored its Taproot implementation over the last month to ensure that everything worked smoothly. It is safer to say now that the update has been properly implemented and is ready for action.</p><p>The Taproot upgrade, which comprises Schnorr, MAST and Tapscript, builds on that foundation, prompts privacy of the layer-1 and simultaneously enables more complex applications to be built on top of it.</p>

Qtum successfully combines Taproot with the EVM

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