Crypto News
MuSig2 Is Ready Pending Two New BIPs: Introducing A New Era Of Multisig Privacy
Traditionally, creating an n-of-n multisig using CHECKMULTISIG means you’ll publish a proportional number of signatures and public keys on the blockchain to signers in the transaction. This approach not only reveals the total number of participants in the transaction, but also incurs progressively higher transaction fees as the number of signers grow. MuSig, on the other hand, allows a group of users to collectively generate a single signature and public key to validate a transaction, which enhances privacy and lowers the transaction costs for all the signers involved.
When MuSig was initially introduced in 2018, its main shortcoming compared to CHECKMULTISIG was user experience, specifically the requirement for three rounds of interactive communication between signers. With the introduction of MuSig2 (BIP 327) in 2020, as the successor to the 2018 MuSig (also called MuSig1), we made significant progress in non-interactive signing, bringing us a much more desired experience.
How it Works
Mirroring the functionality of its predecessor, MuSig2 reduces the required communication rounds from three to two. The wallet setup for MuSig2 begins by collecting all of the participants’ extended public keys (xpubs), and the construction of descriptors by each of the wallets, all of which is consistent with existing multisig practices.
The MuSig2 signing phase then includes:
First-Round Message: During the wallet setup, nonces are generated, added to the Partially Signed Bitcoin Transactions (PSBTs), and shared amongst the other signers.Second-Round Message: The nonces received are used to create a partial signature and are sent back to each of the other signers.
An alternative to having each signer directly communicate their nonce and partial signature to every other signer is to introduce a third-party coordinator to streamline the communication process.
In the signing process, each signer’s nonce is composed of two elliptic curve points. These points are transmitted to other signers through the Partially Signed Bitcoin Transactions (PSBTs). These nonces require careful handling for accuracy and integrity in the process, but secure storage is not necessary since they are not confidential information. If all the individuals partial signatures are valid, then the produced Schnorr signatures are valid.
Next Steps for Implementation
Last month, Andy Chow put forward two BIP drafts, MuSig2 PSBTs and MuSig2 Descriptors, which are a necessary step in MuSig2 adoption and wallet integration. The first BIP adds fields for the nonces, public keys, and partial signatures in the PSBTs, and the second BIP provides a method for describing transaction outputs that are controlled by a MuSig2 wallet. Together, these BIPs and specifications are all we need for integration of MuSig2 wallets!
Many wallet developers and collaborative custody solutions have long requested this standardization of the MuSig2 protocol. Now, with the formalized BIPs in place, it’s in the community’s hands to review, give feedback, and help raise awareness. At Blockstream, we look forward to participating in the public discussions and letting the formal BIP review process take place.
This is a guest post by Kiara Bickers. Opinions expressed are entirely their own and do not necessarily reflect those of BTC Inc or Bitcoin Magazine.
The final standards are being fleshed out to enable Schnorr based multisig across wallets and devices. After 3 years of hard work, things are almost ready to start talking about implementation.
Crypto News
WATCH: BITCOIN PRESIDENT DONALD TRUMP’S INAUGURATION
The day Bitcoiners have been waiting for is finally here. Donald Trump, the first-ever pro-Bitcoin president of the United States, is officially being inaugurated today, January 20, 2025. After a historic campaign in which he famously turned his stance around and championed Bitcoin and crypto throughout 2024, Bitcoiners are eagerly watching to see his promises come to life.
Trump’s campaign was filled with bold commitments to the Bitcoin and crypto industry: national bitcoin reserves, freeing Ross Ulbricht, making the United States the crypto capital of the world, and more. Today marks the beginning of his presidency, and these promises are expected to roll out in the days ahead.
Bitcoin Magazine is thrilled to celebrate this monumental moment in Bitcoin history by bringing you live coverage of the inauguration from PubKey NYC starting at 10:00 a.m. EST.
LIVE: DONALD TRUMP INAUGURATION | AMERICA’S FIRST #BITCOIN PRESIDENT https://t.co/KuwGYgUukP
— Bitcoin Magazine (@BitcoinMagazine) January 20, 2025
The livestream will feature a recap of Trump’s campaign trail, highlighting key moments when he voiced his support for Bitcoin. We’ll be joined by well-known leaders in the Bitcoin space, who will share their predictions and debate the potential impact of the Trump administration on Bitcoin’s future.
This celebratory event brings together Bitcoin and crypto community members to discuss, debate, and reflect on what Trump’s presidency could mean for Bitcoin adoption and regulation.
Don’t miss the action—Catch the Bitcoin Magazine livestream coverage on X, YouTube and Rumble starting today, January 20, 2025, at 10:00 a.m. EST.
Donald Trump’s inauguration as the first pro-Bitcoin U.S. president is here—join Bitcoin Magazine’s live coverage at 10 a.m. EST!
Crypto News
BTCPay Server Foundation Receives $25,000 Grant In Bitcoin From Unbank
Today, the BTCPay Server Foundation was awarded a $25,000 grant paid directly in bitcoin from Unbank, a cash focused Bitcoin exchange, according to a press release sent to Bitcoin Magazine. The grant will be paid out to contributors working on developing new features, open-source payment innovation, and maintenance of BTCPay Server’s Greenfield APIs and codebase.
“Unbank’s support is a testament to the growing recognition of open-source payment solutions in the Bitcoin ecosystem,” said BTCPay Server core contributor R0ckstar Dev. “This grant will help our efforts to enhance BTCPay Server’s capabilities and reach.”
Unbank, which has become a leading bitcoin ATM network with over 830 ATMs and over 30,000 partner locations, is also utilizing BTCPay Server to process bitcoin sell transactions within their app.
“We love using BTCPay Server in our operations,” Emilio Pagan-Yourno, CEO and COO of Unbank. “When customers buy Bitcoin at our ATMs, we rely on their API to batch and broadcast transactions every 15 minutes. Supporting BTCPay Server is not just essential for our business — it’s a privilege to contribute to the FOSS ecosystem that powers financial freedom.”
Last summer, BTCPay filmed and released a documentary covering the use of bitcoin as a means of exchange at the world’s largest Bitcoin conference in Nashville. BTCPay, in collaboration with Jack Maller’s company Strike, enabled every vendor at the conference to accept bitcoin as payment.
The grant will help BTCPay continue to work on open-source payment development.
Crypto News
Trump Likes Crypto: Just As Long As It’s For Grifting
When the $TRUMP meme coin dropped Friday evening, no one was surprised. Or at least, they shouldn’t have been. He has a knack for jumping headfirst into endeavors he thinks he can make money on, in self-promoting fashion, that often end in disaster. Some of these ventures include Trump Airlines, Trump Vodka, Trump Steaks, Trump University, Trump Magazine, Trump Plaza Hotel and Casino, Trump Mortgage, Trump: The Game. Crypto is the next game in town he’s decided to throw his hat into.
I’ve already written articles and talked at various lengths about Trump leaning into the crypto space to earn votes in this past election that in many ways was quite successful. At Bitcoin Nashville this past summer, in an effort to garner support for his presidential candidacy, Trump said some notable things including that America will become “the crypto capital of the planet and bitcoin superpower of the world,” that he would fire Gary Gensler, and that he wants all remaining bitcoin to be made in America (concerning from a decentralized point of view, and highly implausible in reality). He also famously said that he would commute the sentence of Ross Ulbricht on Day one, which if he does I will be the first to give credit where credit is due. (For more on this I recommend watching the recent Reason documentary on why Ross should be freed).
Crypto is Donald Trump’s next frontier and combines several things he absolutely loves when it comes to business deals – Quick easy money, self-promotion, America first messaging, and little bureaucratic friction standing in his way. So, what is $TRUMP coin?
It’s built on the Solana blockchain with a total supply of 1 billion tokens. Initially, 200 million tokens are available for circulation, while the remaining 800 million are held by CIC Digital, a Trump Organization affiliate, subject to a three-year lock-up period (which means the Trump family holds 80% of supply…). Following its launch, the $TRUMP coin’s market cap surged, reaching approximately $6 billion. The coin’s price peaked at $33.7. The $TRUMP coin was marketed as a means for supporters to express their alignment with Trump’s ideals, rather than as an investment opportunity, which is hogwash for the pump and dump self-enrichment scheme that he is in my opinion immoral and unethical for creating, and investors (oops, guess we should say “fans”) are stupid for taking part in.
With inauguration on Monday, we’re entering uncharted territory where it’s likely Trump will issue Executive Orders relating to bitcoin and crypto, and now emboldened by the presidency, lack of legal worries, and supporters that I truly believe would be fine with whatever he does. As he famously quoted, “I could stand in the middle of Fifth Avenue and shoot somebody, and I wouldn’t lose any voters, OK?”
Some of these actions could be positive for the Bitcoin industry and advocates in the United States. But many of his actions could also equally benefit the broader crypto space that is rife with pump-and-dump scam coins and useless get rich quick schemes for wealthy insiders and people who have lobbied him throughout this last cycle. The pump and dump crypto landscape, his goofy coins and NFT’s, make sense to Trump. In fact, I’m betting he truly believes this is crypto’s purpose, while knowing little about Bitcoin. Trump has repeatedly said he has “fun with crypto” and ended his keynote address at the Bitcoin Conference this past summer by saying “have a good time with your bitcoin and your crypto and everything else that you’re playing with.” Trump’s experience in and views of crypto and bitcoin are around fun and making easy money. But with Bitcoin, many of us in the space are fighting for much more, which includes Bitcoin’s many use-cases as censorship resistance digital currency, digital gold, a medium of exchange to use in self-custody and via privacy preserving tools, a powerful tool for human rights, and much more. This isn’t a gamble for us…it’s the future of money that challenges the dollar and central bank rule.
If Trump really began to grasp this, based on his track record and previous statements on Bitcoin, he’d be quite against this use of Bitcoin. Or perhaps he knows what Bitcoin is at some level, and would rather promote the “fun” meme coins, and maybe Bitcoin as digital gold, but nothing more. He did after all say in 2021, quite clearly, “Bitcoin, it just seems like a scam. I don’t like it because it’s another currency competing against the dollar.” He added that he wanted the dollar to be “the currency of the world.” (For more on this concept I’d highly recommend following Mark Goodwin and his work on the bitcoin dollar.)
Trump wants you to keep playing with crypto, funneling money to his organizations, but it’s unlikely he’d be a fan of anyone using bitcoin as a competitor to the dollar, circumventing traditional finance or using privacy tools (particularly if you are an adversary or from what he deems a left/woke cause, which perhaps one day he’d classify our nonprofit The Progressive Bitcoiner as). I’ll keep promoting Bitcoin as resistance money, and hope you’ll join me, rather than endlessly gambling on crypto “and everything else you’re playing with.”
This is a guest post by Trey Walsh. Opinions expressed are entirely their own and do not necessarily reflect those of BTC Inc or Bitcoin Magazine.
$TRUMP Coin is nothing more than a way to extract money from the crypto ecosystem.
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