On June 12, 2021, Bitcoin reached a pivotal milestone that had been years in the making. At block height 687,284, an overwhelming 90% of miners signalled their support for the Taproot upgrade, formally locking in the most significant protocol improvement since SegWit activated in 2017. The consensus triggered a countdown to full activation, scheduled for November 2021 at block 709,632.
TL;DR
- Bitcoin miners reached 90% consensus to lock in the Taproot upgrade at block 687,284 on June 12, 2021
- Taproot combines three Bitcoin Improvement Proposals: BIP 340 (Schnorr signatures), BIP 341 (Pay-to-Taproot), and BIP 342 (Tapscript)
- The upgrade brings enhanced privacy, lower transaction fees, and improved smart contract functionality
- This is the first major protocol upgrade since the contentious SegWit activation in 2017
- Full activation is set for November 2021 following a roughly five-month waiting period
What Is Taproot and Why Does It Matter?
Taproot is not a single change but a bundled package of three interconnected Bitcoin Improvement Proposals — BIP 340, BIP 341, and BIP 342 — all designed to activate simultaneously. Together, they represent the most meaningful technical evolution of the Bitcoin protocol in nearly four years.
The origins of Taproot trace back to discussions among Bitcoin Core developers Pieter Wuille, Andrew Poelstra, and Gregory Maxwell. Maxwell formally released the Taproot proposal in January 2018, and the path to activation took three and a half years of development, review, and community coordination.
Schnorr Signatures: Faster, Smaller, Smarter
The cornerstone of the upgrade is BIP 340, which introduces Schnorr signatures to replace the ECDSA algorithm that Satoshi Nakamoto originally chose for Bitcoin. While ECDSA has served the network well, Schnorr offers several advantages. Its signatures are provably linear, which means multiple public keys can be aggregated into a single combined key. For multi-signature transactions — a common use case for businesses and institutional holders — this translates to smaller transaction sizes and lower fees.
The reason Satoshi originally chose ECDSA over Schnorr remains a subject of speculation. The most common explanation is that the Schnorr patent only expired in February 2008, and no open-source standardization existed when Bitcoin launched in January 2009.
Pay-to-Taproot and MAST: Privacy and Efficiency Gains
BIP 341 defines the Pay-to-Taproot (P2TR) output type, a new way to send bitcoin that enhances both privacy and flexibility. Combined with Merklized Alternative Script Trees (MAST), complex spending conditions can be compressed into a single hash. Only the executed branch of a smart contract is revealed on-chain, which means observers cannot see the full range of conditions that were available.
This has profound implications. Multi-signature wallets, time-locked contracts, and Lightning Network channels all benefit from looking identical to regular single-key transactions on the blockchain. The result is improved privacy for all users, not just those using advanced features.
BIP 342: Tapscript Completes the Package
The third component, BIP 342 or Tapscript, updates Bitcoin scripting language to work with the new Taproot spending rules. It enables more complex smart contract functionality while maintaining backward compatibility — a critical requirement for any Bitcoin soft fork.
The Speedy Trial Mechanism
Taproot activation used a mechanism called Speedy Trial, which gave miners a three-month signaling window. If 90% of blocks within a single difficulty epoch — approximately 2,016 blocks or about two weeks — signaled support, the upgrade would lock in. The threshold was reached on June 12, making Taproot the first major Bitcoin upgrade to achieve such broad consensus without the community conflicts that surrounded SegWit in 2017.
Market Context on June 12
Bitcoin was trading at approximately $35,500 on the day Taproot locked in, according to CoinMarketCap data. The broader crypto market cap stood at roughly $1.51 trillion. Despite the bullish news of the upgrade consensus, BTC was down 3.2% on the day as markets digested the ongoing China mining crackdown. Ethereum traded near $2,419, up 2.8%, while Cardano gained 4% and Polkadot added 0.8%.
Why This Matters
Taproot represents far more than a technical curiosity. By improving transaction efficiency, enhancing privacy, and enabling more sophisticated smart contracts, the upgrade strengthens Bitcoin competitive position against newer blockchain platforms. For everyday users, it means lower fees and better privacy. For developers, it opens new possibilities for decentralized applications built on Bitcoin. For the network itself, it demonstrates that Bitcoin governance can achieve broad consensus without the bitter divisions of the past. The smooth activation process was itself a victory for the Bitcoin community, proving that the network can evolve without fracturing.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. Cryptocurrency investments carry risk. Always do your own research before making investment decisions.
been waiting for schnorr since the scaling debates. 90% signal speed was way faster than anyone expected, pieter wuille really pushed this through
The fact that BIP 340 makes multisig look identical to single-sig on chain is huge for privacy. Most people are sleeping on this part.
^ exactly. 2017 segwit was so toxic and this locked in with barely any drama. says a lot about how the community matured since the blocksize wars
block 687284 going down in history. november activation cant come soon enough, lightning tx efficiency about to get a major upgrade