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The proposal titled "The Cat," available for review at GitHub, introduces a novel strategy aimed at limiting non-monetary applications of Bitcoin, such as inscriptions and Stamps-style protocols. These applications currently constitute over 40% of the Unspent Transaction Output (UTXO) set in widely adopted implementations.

Next week, a meeting will be organized to deliberate on the activation parameters for BIP 119. Participants are encouraged to familiarize themselves with the related pull requests, various activation methods, and previous meeting logs to contribute effectively to the discussion.

The recent initiative by SatsBridge introduces a pioneering protocol that integrates Bitcoin's Lightning Network (LN) with Ethereum's smart contract capabilities, focusing on enhancing user experience and security in cross-chain wallet architecture. This protocol utilizes LNURL AUTH to extend its application towards managing Ethereum abstracted accounts, thus enabling Lightning wallets to serve as remote signers for these accounts without necessitating any modifications to the existing Lightning wallets.

The email discusses two Bitcoin Improvement Proposals (BIPs) published by the sender for peer review. The first proposal, named BUDS (Bitcoin Unified Data Standard), is an informational proposal that aims to establish a neutral, non-consensus taxonomy for describing transaction data within the Bitcoin network.

The ongoing dialogue among Bitcoin developers and researchers is centered on enhancing the cryptocurrency's security against quantum computing threats, with a focus on post-quantum cryptographic solutions. Hash-based schemes, especially SPHINCS+, have emerged as a promising option due to their reliance on the well-established security of hash functions like SHA-256, which is already integral to Bitcoin's design.

The discussion revolves around a new proposal aimed at improving the management of ScriptPubKey lengths in UTXO transactions on blockchain networks. The proposal suggests implementing a limit of 260 bytes for the ScriptPubKey length in new UTXOs, with an exception for transactions within blocks that are divisible by 256 without remainder.

The discussion revolves around the introduction of a new feature in Bitcoin Core, aimed at enabling users to schedule transactions for future broadcast to the bitcoin network. This functionality seeks to address various needs, such as disguising the actual time a transaction was created or accommodating future conditions that cannot be met through current bitcoin scripts.

The discussion revolves around the evolution and potential improvements in the management of network traffic for Bitcoin nodes, emphasizing the need for enhanced segregation between different types of network messages such as block, transaction (tx), and address (addr) messages. Initially, Bitcoin Core connections defaulted to full relay, mixing various traffic types over a single network link.

The recent release of LND version 0.19.0 marks a significant advancement in addressing critical security vulnerabilities within the Lightning Network Daemon (LND), underscoring an ongoing effort to enhance the platform’s security posture. This update, available at LND 0.19.0, introduces essential fixes aimed at mitigating one denial of service (DoS) vulnerability and two theft of fund vulnerabilities.

The discussion revolves around the proposal for a new Bitcoin Improvement Proposal (BIP) that introduces a silent payments output descriptor format to enhance wallet interoperability and backup/recovery capabilities. This proposal outlines the creation of a top-level script expression named sp(), designed to facilitate silent payments by combining key material with sender input public keys.

Vanadium represents a novel approach to developing firmware applications for hardware signing devices, addressing the longstanding challenges faced in embedded development such as limited RAM and flash memory, slow iteration cycles, and the complexities of debugging. Developed as a RISC-V Virtual Machine capable of running in an embedded Secure Element, Vanadium offers a significant departure from traditional development constraints by enabling the execution of arbitrary applications, termed "V-Apps," within a secure enclave environment.

A groundbreaking prototype that enhances Bitcoin security through a vault-like scheme has been introduced, utilizing the concept of blinded co-signers in tandem with Musig2, a multi-signature protocol. This innovative approach aims to protect fund movements on the blockchain by minimizing the information co-signers have about transactions.

The cryptocurrency community has been actively discussing the challenges associated with slow block propagation, particularly focusing on how it affects miners. An intriguing aspect of this discussion is the concept of optimistic mining, a method that allows miners to begin working on a new chain tip before its validation is completed.

The discussion centers on the technical complexity and implications of integrating specific primitives like OP_CSFS into blockchain technology to influence miner behavior, specifically to disincentivize the inclusion of third-party transactions. The initial assertion challenges the clarity and practical application of these combined primitives in creating effective smart contracts for this purpose.

In the latest exchange on the Bitcoin Development Mailing List, a significant conversation unfolded regarding the utilization of SIMD (Single Instruction, Multiple Data) in cryptographic processes. It was highlighted that employing SIMD can lead to remarkable performance improvements, outpacing SHA-NI significantly.

The discussions within the Bitcoin development community have recently centered on the cautious and moderated approach towards implementing new covenants, with a specific focus on the opcode known as OP_CTV (OP_CheckTemplateVerify). This opcode is favored for its non-recursive nature and limitations that prevent its use in potentially unsafe operations, making it an ideal candidate for initial adoption.

The integration of NBitcoin into the script_eval target of bitcoinfuzz, which is designed for differential fuzzing of Bitcoin script evaluation logic, revealed a significant discrepancy when compared to the behavior of existing projects like Bitcoin Core and btcd. This discrepancy surfaced during a fuzzing campaign that utilized a good corpus, leading to the discovery of a crash caused by a specific script involving multiple OP_NIP operations.

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The development of a visual, node-based editor named raw₿it revolutionizes the way individuals can learn and build Bitcoin transactions from scratch. This innovative tool allows users to construct raw Bitcoin transactions visually by dragging and dropping predefined nodes on a canvas.

The public release of Penlock marks a significant milestone in the domain of cryptographic security, particularly for individuals keen on securely managing their digital assets. Penlock is a novel tool designed to facilitate the mechanical splitting of a 12-word seed phrase into a 2-of-3 backup format.

The discourse surrounding the integration of artificial intelligence (AI) into various aspects of professional workflows, as shared by Oghenovo Usiwoma and Bitcoin Mechanic, presents a multifaceted view on the evolution of work processes with AI. The discussion underlines the natural human inclination towards seeking the most efficient means to achieve objectives, which increasingly involves leveraging AI tools. This trend is notably beneficial for a range of tasks including summarizing extensive discussions, prioritizing issues, identifying duplicate proposals, and spotting clear errors in coding practices.

The discussion encompasses a multifaceted exploration of how to reconcile the demand for content moderation within the immutable framework of blockchain technology, specifically targeting Bitcoin's infrastructure. The discourse introduces an innovative proposal aimed at enabling node operators to selectively filter and remove objectionable content post-mining without undermining the foundational integrity of the blockchain.

The draft Bitcoin Improvement Proposal submitted for discussion aims at the standardization of on-chain identity publication. It introduces a specification that includes canonical CBOR payloads and employs Poseidon-based nullifier_hash domain separation with identifiers v0iden and v0corp.

The recent update on the Bitcoin backbone, as detailed in the communication, brings to the forefront several significant enhancements and developments aimed at refining the overall functionality and security of Bitcoin transactions. The primary focus has been on the re-implementation of BIP324, alongside efforts to eradicate bugs, introduce a simplified transaction relay stack, implement a mempool buffer, and lay foundational work for address management.

The cluster mempool proposal is designed to optimize the total fees within the mempool by ensuring a structured ordering of transaction clusters. This initiative aims to enhance the overall fee structure by maintaining "incentive compatibility," which requires new transactions to contribute positively to the existing mempool's fee configuration.

In the latest installment of our series on Simplicity, a blockchain programming language designed for Bitcoin and Liquid applications, we delve into the intricacies of how Simplicity expressions can influence transactions. Specifically, we examine the Reader and Failure effects that play pivotal roles in transaction validation.

In considering the potential policy framework for handling quantum-vulnerable Unspent Transaction Outputs (UTXOs) post-"Q-day," it's crucial to examine the different vulnerabilities and proposed responses. There are two primary categories of vulnerability: address type vulnerability and address re-use vulnerability, each necessitating a distinct approach.

Address type vulnerabilities, such as those found in Pay to Public Key (P2PK) and Pay to Taproot (P2TR) addresses, prompt suggestions like freezing transactions from these types after Q-day or implementing a rate-limit on spends through proposals like the "Hourglass." The rationale behind freezing transactions lies in the assumption that there would be a sufficient warning period for the adoption of post-quantum (PQ) address types, making any transaction from legacy types after Q-day potentially compromised.

The analysis delves into the strategic concept of "Selfish Mining," a tactic that enables miners to boost their earnings by selectively publishing blocks. It is explained that under certain circumstances, this strategy can provide an advantage to larger miners due to the role of block propagation times.

Solar storms, while often underestimated, pose a significant threat to our technological infrastructure. The Carrington Event of 1859 serves as a historical benchmark for the potential damage a massive solar eruption can inflict, demonstrating how such events can disrupt telecommunication systems and electrical grids on a global scale.

The feature request under discussion highlights the necessity for Bitcoin to improve its resilience against major solar events, such as significant solar storms, which could disrupt Earth's electrical and communication infrastructures. These disruptions pose a real threat to the integrity of the Bitcoin network, potentially causing fragmentation into isolated regions that continue mining independently.

The project's primary focus has been on monitoring the Lightning gossip network, collecting gossip messages from a variety of nodes since its inception at PlebFi Miami. The resources related to this project, including code repository, raw data, and presentation slides, are accessible here.

The discussion revolves around the integration of silent payment spending within the PSBT (Partially Signed Bitcoin Transaction) framework, specifically addressing gaps in the current specifications. Silent payments, unlike traditional transactions, require different handling to achieve privacy and security.

The segOP proposal, introduced by Defenwycke, aims to significantly enhance Bitcoin transactions by establishing a segregated, structured, full-fee data lane for on-chain data storage. This initiative seeks to mitigate the current inefficiencies and limitations associated with arbitrary data storage within the blockchain, specifically addressing the issue of fee market distortion caused by Segregated Witness (SegWit).

In an extensive discourse on the potential of embedding data within Schnorr signatures, particularly under the BIP340 framework, AdamISZ offers a critical analysis that zeroes in on the inherent challenges and limitations. The principal concern revolves around whether it is feasible to embed data into Schnorr signature tuples (P, R, s) without resorting to grinding or revealing the private key, which could compromise the security of the associated UTXO set.

The LNHANCE proposal introduces a series of four new opcodes to the Bitcoin blockchain aimed at enhancing its functionality, specifically targeting improvements in the Lightning Network's LN-Symmetry implementation. These opcodes include OP_CHECKTEMPLATEVERIFY (CTV), OP_CHECKSIGFROMSTACK (CSFS), OP_INTERNALKEY (IKEY), and OP_PAIRCOMMIT (PC), each with detailed documentation available on GitHub.

Antoine Poinsot recently updated the progress on BIP54, also known as Consensus Cleanup, emphasizing its development and testing stages. A notable advancement includes the implementation against Bitcoin Inquisition version 29.1, which has been comprehensively documented.

Juan Alemán initiated a discourse within the Bitcoin developer community, expressing concerns over recent changes in version 30 of the Bitcoin Core defaults that significantly diverge from historical standards, which sparked discussions about a potential network fork. Alemán suggests that reverting these defaults could prevent such drastic measures and proposes a structural adjustment to the repository to reduce political influence on policy decisions.

In the realm of blockchain technology and specifically within Bitcoin's innovative ecosystem, the concept of private key handover has emerged as a pivotal method for optimizing transaction processes and enhancing protocol efficiency. This technique is particularly relevant in scenarios where control over a shared fund transitions from multiple participants to a single party at the conclusion of a protocol.

Bitcoin traces its origins to the 2008 publication "Bitcoin: A Peer-to-Peer Electronic Cash System" by Satoshi Nakamoto, which proposed a decentralized digital currency free from central authorities through cryptographic proof and consensus. The early development of Bitcoin between 2009 and 2011 was marked by collaboration among programmers and cryptographers who prioritized transparency, privacy, and open systems, with Satoshi's anonymity remaining a notable aspect of its legacy.

The creation of Bitcoin under an anonymous identity posed significant challenges, including maintaining secrecy while building public trust, coordinating development in an open-source environment without revealing one’s identity, navigating potential legal and social resistance, and ensuring that the project's core intent of decentralization and freedom remained unaltered.

The Bitcoin blockchain has experienced remarkable growth over the past 16 years, amassing more than 1.2 billion on-chain transactions and nearly 700GiB of data. This expansion has introduced significant challenges in setting up new nodes due to the extensive dataset that requires processing.

In an innovative step towards enhancing Bitcoin's security and efficiency, a new proposal introduces the concept of a generalized sigops budget, now termed as the varops budget. This initiative aims to preemptively allocate computational resources across all operations within the Bitcoin script execution process.

The discourse delves into the rationale and implications behind the preservation of 80,000 signature operations (sig ops) in Bitcoin's Taproot update, as encapsulated by BIP340-342. The conversation traces the lineage of this decision back to foundational changes in Bitcoin’s protocol, starting with the original block size limit introduction aimed at curbing potential denial-of-service (DoS) attacks by limiting transaction sizes and the number of sig ops.

The discourse explores the intricacies of a decentralized mining framework known as p2share, which aims to enhance the Bitcoin mining process by introducing an innovative share-based reward system. The model diverges from traditional mining rewards by issuing shares for work performed, allowing participants to potentially receive Bitcoin rewards based on the shares they hold.

In the ongoing discussions on the Bitcoin Development Mailing List, a consensus seems to be forming around the notion of reverting the recently introduced rules regarding the use of AI and LLMs in the drafting of Bitcoin Improvement Proposals (BIPs). The primary rationale behind this shift is the recognition that while the concerns surrounding AI-generated content are valid, they are perceived as less urgent compared to the broader benefits presented by BIP 3. The dialogue suggests adjusting expectations around contributions rather than setting strict prohibitions against AI, advocating for a review process that allows for discretion in engaging with submissions that appear to be of low effort or predominantly AI-generated.

Melvin's contribution to the discussion provides crucial insights into the mechanics of achieving rough consensus for BIPs, particularly emphasizing the need for a collective decision-making process rather than relying on individual judgments.

In the ongoing exploration of Simplicity, a programming language tailored for blockchain applications like Bitcoin and Liquid, the series delves into enhancing computational expressions with side effects. Side effects, in this context, vary widely from state updates to logging, and their integration is pivotal for extending the functional scope of Simplicity beyond its core combinators, which are sufficient for any finite pure computation.

A significant vulnerability was identified in versions of nutshell prior to 0.18.0, where the size of a preimage was not validated. This flaw permitted attackers to overload the mint’s database and disk space with arbitrary data by exploiting the handling of HTLC (Hash Time Locked Contracts) preimages.

The concept of Post-Quantum cross-input signature aggregation (CISA) represents a significant advancement in addressing the challenge of large signature sizes inherent to post-quantum cryptographic algorithms. The proposed method, OP_CIV or OP_CHECKINPUTVERIFY, is designed to be compatible with any signature type, including those based on post-quantum cryptography.

The v31.0 release of Bitcoin Core signifies a decade since the significant transition from OpenSSL to libsecp256k1 for ECDSA signature validation, a move that has notably improved the efficiency and performance of signature validation processes. Initially integrated in 2015, this shift has rendered signature validation multiple times faster, with ongoing enhancements further increasing the performance gap between libsecp256k1 and OpenSSL.

In the exploration of updates and changes to the Bitcoin archive, a significant review was conducted to assess the differences between the current state of the delving-bitcoin-archive and a new archival snapshot. This examination, detailed through a pull request opened on GitHub, aimed to identify not only the predictable variations such as the fluctuation in the number of likes or the addition of JSON fields exclusive to newer versions of the discourse but also to uncover content that had not been previously archived.

The investigation into the archive's comprehensiveness revealed an unexpected finding: several posts and topics were identified as missing from the initial archival process.

Miniscript Studio emerges as a forward-thinking online Integrated Development Environment (IDE) that significantly enriches the programming landscape for Bitcoin's scripting language, Miniscript. This platform was initially conceived to address and enhance error handling within Miniscript expressions.

Jakob Widmann has proposed a novel concept aimed at addressing the scalability issues of Bitcoin, specifically targeting the limitations inherent in the Lightning Network. His approach seeks to circumvent the complications associated with watchtowers and channel-based routing by leveraging the existing mining infrastructure.

The discourse within the Bitcoin community regarding its direction, privacy concerns, and adherence to its foundational principles has sparked a rich conversation across multiple facets. The crux of this conversation lies in the tension between Bitcoin's original intention as a peer-to-peer electronic cash system and its evolving role that some fear may lean towards a settlement layer for banks.

The recent discussions on the Bitcoin Development Mailing List have delved into several contentious issues surrounding proposed changes to Bitcoin's consensus rules. Central to the debate is a proposal aimed at addressing the use of Bitcoin for purposes other than monetary transactions, specifically targeting the embedding of large non-monetary data within the blockchain.

In the realm of Bitcoin payment solutions, a significant technical discourse is dedicated to enhancing support for BTCPayServer with Schnorr Protocol (SP) compatibility. The challenge centers around the encoding of scan private keys and spend public keys, which is vital for executing seamless transactions within the SP's architectural framework.

A low-severity vulnerability has been identified affecting all versions of Bitcoin Core from v24.0 to v30.0. This issue, which concerns the potential exposure of sensitive information such as private keys and wallet passphrases through debug console history, was initially reported on GitHub and highlighted across social media platforms.

The Bitcoin Core team recently announced the resolution of four low-severity security vulnerabilities in version 30.0 of their software, underscoring their ongoing commitment to maintaining robust security standards. Initially, five vulnerabilities were slated for disclosure; however, one was subsequently reassessed as medium severity and its disclosure has been postponed in line with the team's security protocols.

Centralization in the context of monetary systems, as explained by Hayek, does not inherently imply a negative connotation. Hayek's exploration into this subject reveals that certain systems, especially those tied to security concerns, benefit from centralization.

The ongoing debate about the necessity and benefits of running a node touches upon various aspects, including personal security, decentralized networks' accessibility, and utility. Despite the enthusiasm among proponents for widespread individual participation in node operation, clear and convincing reasons for the average person to engage in this endeavor remain elusive.

The latest version of Bitcoin Core, 28.3, is now available for download. This can be accessed directly through the provided link or via BitTorrent with the detailed magnet link included in the original announcement.

The discussion raises a critical concern regarding the reliance on ASIC chips within the realm of computing and cryptocurrency mining. The primary issue highlighted is the potential risk of states colluding to monopolize ASIC production facilities.

The exploration of the Nashian Orientation of Bitcoin encompasses two distinct paths: a simpler path with six essays and a more complex path with 15 essays, each offering a deep dive into various facets of Bitcoin's philosophical, economic, and technical aspects. The simpler path elucidates the concept of Ideal Money, presenting it as a politically neutral global standard for money comparison, which could lead to efficiency gains in the global economy and foster long-term contract formation.

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The analysis of recent adjustments in JoinMarket's transaction fees, specifically the tenfold reduction in minimum relay transaction fees (minrelaytxfee), has yielded unexpected results regarding coinjoin volume.

A demo instance of the peer-observer has been successfully set up and is now available for public access at demo.peer.observer. This instance features two nodes, named hal and len, offering users the opportunity to explore its functionalities.

The recently updated reputation algorithm has been rigorously tested against various types of attacks, demonstrating its robustness in safeguarding against resource attacks and diminishing the effects of sink attacks. This is achieved through mechanisms that compensate targeted nodes for potential revenue losses, thereby deterring financial incentives for such attacks.

The recent announcement regarding Bitcoin Core's new version v28.3rc2 highlights the availability of binaries which interested parties can download from Bitcoin Core's official website. This update serves as a release candidate for a forthcoming major version release, indicating its significance in the development cycle.

The communication involves a proposal for a Bitcoin Improvement Proposal (BIP) which has been shared for review and feedback. The sender has made a draft of their idea available on GitHub, indicating a step towards contributing to the development and enhancement of the Bitcoin protocol.

The conversation revolves around the complex dynamics of implementing policy controls within Bitcoin's network, specifically focusing on the management of mempools and transaction filters. The initial proposal brought forth by a software engineer suggests a shift towards decentralizing policy enforcement in the Bitcoin network.

In an intriguing exploration of compact block relay within the Bitcoin network, a developer conducted tests using a specifically configured node in Knots. The configuration aimed at assessing compact block relay performance included enabling debug for compact blocks (debug=cmpctblock), setting no minimum fee filter (feefilter=0), and increasing the block reconstruction extra transaction size to 300 (blockreconstructionextratxnsize=300).

The proposal to introduce a new opcode, OP_STARK_VERIFY, into Tapscript signifies an innovative step towards integrating zero-knowledge proof verification directly into Bitcoin. This move is driven by the desire to support applications such as Validity rollups, post-quantum signatures, and privacy-preserving transactions with efficient on-chain verification capabilities.

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Programming, at its core, involves solving problems and creating efficient solutions through code. A fundamental aspect of this process is understanding data structures and algorithms, which serve as the backbone for developing robust software applications.

The concept of maintaining an implicit block template within the TxGraph component is introduced as a means to streamline the process of estimating potential fee increases for block templates without necessitating the maintenance of a separate template set. This methodology leverages the indexing of transaction chunks by descending fee rate within TxGraph, utilizing this ordered index to compile an implicit block template up to a threshold defined by chunk $c_\mathrm{nf}$, where adding another chunk would exceed the maximum block size limit.

Bitcoin Guard emerges as a pioneering solution aimed at enhancing the security of Bitcoin users by shifting the balance of power from attackers to potential victims. This initiative is sparked by an alarming trend of physical attacks on individuals for their Bitcoin, which prompted the development of this project.

The release of Bitcoin Core version v30.0 marks a significant update, introducing an array of new features, bug fixes, performance enhancements, and updated translations. This version indicates the termination of support for versions 27.x and older, urging users to upgrade to continue receiving maintenance updates.

The latest release of Bitcoin Knots, version 29.2.knots20251010, is now officially available for download. This new version can be accessed through the provided link and introduces several critical bug fixes alongside the inclusion of a new Dockerfile.

The B-SSL — Bitcoin Secure Signing Layer introduces an innovative approach to enhancing the security and management of Bitcoin, focusing on mitigating the risk of permanent key loss without compromising the user's sovereignty. This system utilizes existing Bitcoin technologies like Taproot and specific scripts such as CHECKSEQUENCEVERIFY (CSV) and CHECKLOCKTIMEVERIFY (CLTV) to establish a secure environment for transactions directly on the blockchain.

The latest release candidate for Bitcoin Core, version 29.2rc2, is now available for download and testing. Interested users can access the binaries through the provided link, while developers looking to review or contribute to the source code can find it on GitHub under the signed tag here.

The latest release candidate for Bitcoin Core, version 29.2rc2, is now available for testing. Participants and interested parties can download the binaries from the official Bitcoin Core website.

The recent communication highlights the availability of a third release candidate for Bitcoin Core version 30.0, which can be accessed at bitcoincore.org. The finalization of the release notes is underway and can be reviewed on GitHub at this link.

The latest release candidate for Bitcoin Core, version v30.0rc3, is now accessible for both testing and review. Interested individuals can download the binaries from Bitcoin Core's official website, while the source code is available under a signed tag at the project's GitHub repository.

The exploration and analysis of Trusted Execution Environments (TEEs) highlight a significant vulnerability in their design, specifically regarding persistent mutable storage. This vulnerability is critical as it exposes TEEs to rollback attacks, which are particularly threatening to applications dealing with cryptocurrencies like Bitcoin.

The latest release candidate for Bitcoin Core, version v28.3rc1, is now available for download. Interested parties can access binaries from the provided link, and the source code is accessible via a signed tag on GitHub at this link.

The discussion initiates with an acknowledgment of the complexities involved in the relationship between the probabilities of a user breaking into their own system versus an attacker doing so, within the framework of threshold systems. It is pointed out that these probabilities, denoted as $p(\tau)$ and $q(\tau)$ respectively, are not independent as they both operate within the same underlying threshold system.

Recent analyses have revealed significant insights into the structure and optimization of blockchain technology, particularly within the Bitcoin network. A notable finding from the last four years shows that witnesses account for approximately 53% of all block data.

The evolving discourse on enhancing Bitcoin's cryptographic security against potential quantum computing threats has led to significant developments, particularly concerning the Pay to Quantum Resistant Hash (P2QRH) and its integration into the Taproot (P2TR) infrastructure. The latest amendments focus on transitioning P2QRH to a script-only version of Taproot, eliminating the quantum-vulnerable key-spend pathway.

The discourse around the inefficiencies introduced by knots in the Bitcoin network's mempool and block relay process sheds light on a nuanced understanding of blockchain dynamics. Observations suggest that an increase in stale blocks, which has risen from 1 per 1300 to 1 per 1000 over recent months, may be indicative of deeper systemic issues potentially exacerbated by knots.

The correspondence delves into the intricacies and potential vulnerabilities associated with implementing a wallet system that relies heavily on the Nostr protocol, particularly focusing on the risks of storing critical data without a robust fallback mechanism. It highlights concerns over the reliance on Nostr for critical data storage, pointing out instances where relays in the Cashu network have deleted their databases, underscoring the precariousness of depending solely on Nostr for important data retention.