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19866. Users that build Bitcoin Core with eBPF tracing enabled can hook into the tracepoints with the provided example scripts or write their own tracing scripts for greater observability into the node when a new block is connected, inbound P2P messages are received, and outbound P2P messages are sent. The documentation also includes usage examples and guidelines for the addition of new tracepoints. It is known for its hassle-free usage. This week’s newsletter links to transcripts of recent LN specification meetings and summarizes a thread about the safety of blind MuSig2 signing. This week’s newsletter celebrates the lock-in of the taproot soft fork, describes a draft BIP for improving transaction privacy by varying the fields used to implement anti fee sniping, and features an article about the challenges of combining transaction replacement with payment batching. At CardCoins we took a safety-first approach to our implementation (with the help of Matthew Zipkin), the details of which we described in a blog post, RBF Batching at CardCoins: Diving into the Mempool’s Dark Reorg Forest. 135, BlockSource allows software to obtain data from sources other than a standard Bitcoin Core compatible node, allowing redundancy that can help prevent eclipse attacks or other security problems.

Once this feature is finalized, users will be able to use their HWI-compatible hardware wallets directly from the Bitcoin Core GUI. 21573 updates the version of libsecp256k1 included in Bitcoin Core. ● C-Lightning 0.10.1rc2 is a release candidate for an upgrade that contains a number of new features, several bug fixes, and a few updates to developing protocols (including dual funding and offers). Similarly, RBF is useful for an enterprise who takes a fee-underbidding strategy (their initial transaction broadcast starts at a low fee, and is slowly bid upwards), but it exposes their customers to potential confusion as their withdrawal transaction updates in their wallet. For example, batching customer withdrawals may save on fees for the enterprise, but will likely make child pays for parent (CPFP) uneconomical for a customer who wishes to speed up the transaction. By themselves, the MuSig family of multisignature schemes only give you n-of-n signing-every party who contributes a key towards the aggregated public key must also contribute a partial signature to the final signature. Several developers are working on threshold signature schemes that will bring the same efficiency and privacy benefits of multisignatures to k-of-n scenarios, but there’s a simple trick that can be used until those schemes are available.

Bitcoin reviews over at youtu.be-the-counter (OTC) markets are "off-the-books" decentralized exchanges that happen through face-to-face meetings and remote trades. That works perfectly well as a direct replacement for some uses of script-based multisig today, such as spending 2-of-2 LN funding outputs, but it’s a departure from other popular policies such as the 2-of-3 multisig script used by many exchanges. 3. When one of the wallets wants to spend the funds, it uses a PSBT-based workflow similar to what it would use with script-based multisig, but now two rounds of communication between signers are required. For example, in a 2-of-3 situation, it might be known that normally Alice and Bob will co-sign, while Carol only signs if one of the others is unavailable. If the parties agree before creating the pubkey, they may also make it possible for fewer than all of them to sign, e.g. 2-of-3 of them must cooperate to sign. Readers celebrating the lock-in of taproot may also wish to read a short thread about taproot’s origins and history by developer Pieter Wuille. Read more: Will Bitcoin go back up?

The classic mode is more advanced and brings back the "classic" look and feel of Binance exchange. As a seller, you may be able to accept Bitcoin transactions from a buyer, but when you try to send to an exchange to sell or even cash out for real money, you may find it’s not possible, so you’re stuck with Bitcoin and the services that can be purchased directly with it. Is Binance exchange safe and secure? Taproot will be safe to use after block 709,632, which is expected in early or mid November. All wallets that implement anti fee sniping today use nLockTime height locks, but it’s also possible to implement the same protection using BIP68 nSequence height locks. ● BIP proposed for wallets to set nSequence by default on taproot transactions: Chris Belcher posted a draft BIP to the Bitcoin-Dev mailing list suggesting an alternative way wallets can implement anti fee sniping. Anti fee sniping is a technique some wallets implement to discourage miners from trying to steal fees from each other in a way that would reduce the amount of proof of work expended on securing Bitcoin and limit users’ ability to rely on confirmation scores.