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Why Are Taproot Smart Contracts More Private? A Non-Technical Explanation

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Our exploration of the brand new superpowers Taproot offers to Bitcoin continues. Yesterday, we outlined sensible contracts and coated the performance of the Taproot-enabled ones. To summarize, Taproot offers new traits to Bitcoin layer one which allow sensible contract expressiveness in layer two options. Today, the subject is privateness. What occurs on the blockchain stays there ceaselessly. With that in thoughts, these Taproot contracts solely reveal completely crucial data.

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How do they handle to try this? Let’s ask the consultants.

How Does Taproot Privacy Work?

In the previous, to execute a contract, every node of the Bitcoin community needed to run it. That left the events concerned within the contract weak and uncovered, as Bitcoin Magazine explains

“This network-wide execution also means that the parties involved have no privacy regarding what their smart contract entails: The entire network will know exactly what it looks like. By extension, this is bad for fungibility as well. If the smart contract is unpopular for some reason, the funds involved — publicly visible on the blockchain — are tainted.”

For the Bitcoin community to prosper the builders have to think about each situation, and that is one. The Taproot improve fixes this. Blockstream offers us a barely extra technical clarification, “The innovation of Taproot is to embed the scripting capability, which previously had to be conspicuously opted into by wallet software (for example, to support escrow payments, Lightning HTLCs or multisignature policies), inside the key itself.” This is likely one of the improvements that’ll assist future wallets to operate in a lighter and more practical means. Bitcoinist will cowl that subject in a while. For now, Blockstream informs us that after Taproot:

“Under typical circumstances, the existence of this script is never revealed at all. Only if the script is needed is it revealed. To further improve this situation, thanks to the use of Schnorr signatures rather than ECDSA, script is necessary in far fewer situations than before.”

BTCUSD price chart for 11/19/2021 - TradingView

BTC value chart for 11/19/2021 on Coinbase | Source: BTC/USD on

The Previous Configuration Was Data Heavy

Post-Taproot, every little thing will likely be lighter. Before Taproot, in a earlier Bitcoinist put up, we obtained technical by quoting Bitcoin Magazine

“It’s currently necessary to reveal all the possible conditions that could have been met — including the conditions that weren’t met.” This is “data heavy” and a privateness threat. 

Under Taproot, “all the different conditions under which the funds can be spent are individually hashed (as opposed to combined into a single hash) and included in a Merkle tree.” So, if any of the information must be revealed, “The rest of the Merkle tree remains hashed and hidden.”

It’s additionally price noting that, post-Taproot, it gained’t be potential to establish the character of most transactions. All of them will look the identical on the blockchain. Bitcoinist defined this earlier than:

“Taproot supplies a brand new output kind with a single signing key type, thus altering the transaction processes. This interprets into enhancements for superior privateness, decrease charges, extra versatile multi-sig, and bitcoin’s availability to be locked to a number of scripts without delay.

River Financial additional explains that “Since the Lightning Network relies on 2-of-2 multisig, Taproot makes it impossible to discern which transactions create Lightning channels.”

Are There Privacy Holes In Taproot?

Unfortunately, a Reddit user already discovered a solution to establish the opening of public Lightning Network channels.

“It is correct that with Taproot one cannot tell the difference between LN channel openings and a normal transactions in cooperative scenarios solely based on on-chain data. Unfortunately public channels announce the “Channel Point” (see this example) to the world, which is the channel opening output, which is strictly the knowledge that Taproot tries to cover. It continues to be useful for personal channels although.”

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In any case, there’ll be extra privateness throughout the Bitcoin community. As Johnny Lyu, CEO at Kucoin, just lately advised Bitcoinist:

“The third aspect will benefit users – to improve privacy protection. The SSA bundling system will make it more difficult to track individual transactions, thereby strengthening the level of privacy protection for bitcoin senders.”

And that’s the place we’re.

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