LND’s October 22 release candidate brings attention to a quiet source of wallet risk: outside fee estimates that software treats too generously. The 0.21.5 development notes describe a ceiling for values received through an external fee API, alongside fixes to other node operations.
TL;DRThe release notes say external estimates previously had a lower bound without the corresponding upper bound. The documented repair limits the estimate before it can flow into fee-sensitive wallet operations.
The associated change applies a ceiling of 10,000 satoshis per virtual byte and also bounds the API’s minimum-relay estimate. That ceiling is an extreme-value guardrail. It is not a statement that such a fee is normal, economical or required by current network conditions.
A fee estimate is an input to a decision, not an instruction that must be obeyed at any cost. A service can return an unusable value because of an error, a changed data format or a compromised dependency. Bounding the input limits one way that an upstream problem can influence a wallet.
The larger operational issue connects with Bitcoin Core’s revised disclosure process: software that handles money needs both a method for finding problems and a path for getting repairs into use.
The GitHub release page identifies the build as a pre-release and says it requires no database migration. It provides signature and binary-verification instructions. Those details support checking what was downloaded; they do not demonstrate how it will behave in every node configuration.
The notes also describe a native SQL connection-pool deadlock fix. That matters because node reliability depends on storage behavior as well as network communication. A process that remains running while requests stop completing can still fail the applications depending on it.
Testing a candidate therefore needs to cover the service’s actual work: receiving requests, accessing storage, handling failures and restarting cleanly. The absence of a database migration removes one category of change, but it does not prove that every interaction with existing data is unchanged.
For payment providers, that is distinct from the custody controls explored in shared-key Bitcoin lending. Keeping signing authority secure and keeping a payment node functioning are separate responsibilities.
The same distinction explains why custody and recovery arrangements cannot replace software maintenance. This candidate offers specific changes to evaluate. The final release decision and an operator’s deployment decision remain additional steps.
Written by the News Desk and edited by Samuel Rae.
Bitcoin Magazine
Researchers Build First Working Post-Quantum Defense for Bitcoin’s Lightning Network
Whether or not quantum computers will break Bitcoin one day is a hot topic.
But what about second-layer solutions like Lightning?
Well, researchers from East Texas A&M University, North American University, Florida Gulf Coast University, and Florida Institute of Technology have been working on that.
JUST IN: East Texas A&M University students announce they've built the first post-quantum security solution for the Bitcoin Lightning Network
— Bitcoin Magazine (@BitcoinMagazine) September 22, 2026
In an announcement Tuesday, the team of researchers said that they built what they describe as the first full post-quantum security design for the Lightning Network.
As first uncovered in a research paper in September, the team said they added post-quantum cryptography to Lightning’s communications, payment requests and related systems, implemented in Rust-Lightning.
It works like this: The solution layers new quantum-resistant cryptography on top of Lightning’s existing cryptography rather than replacing it. It uses ML-DSA digital signatures and ML-KEM key exchange, post-quantum algorithms standardized by the U.S. National Institute of Standards and Technology, alongside the classical methods Lightning already relies on.
In this hybrid design, an attacker would have to break both the new and the old cryptography to compromise a connection or forge a payment request.
According to the team led by Dr. Ahmet Kurt, an assistant professor in East Texas A&M’s Department of Computer Science and Information Systems, it took about three to four months and roughly 11,000 lines of code — and it’s a complete working implementation, not just a small demo.
Lightning lets users make fast, cheap Bitcoin payments through a network of off-chain channels instead of recording each one on the blockchain.
Its cryptography could eventually be broken by powerful quantum computers, and that risk exists even if Bitcoin itself gets upgraded, because Lightning has its own communication and payment systems, the team said.
They added that their work demonstrates that Lightning’s off-chain systems can begin preparing for the quantum era independently while others focus on solutions for the mainnet.
Quantum researchers have warned that a time will come when Bitcoin’s software — which underpins the biggest and strongest computer network in the world — will need to be upgraded to deal with quantum computing.
While some crypto VC firms have urged action, top developers in the space have argued that many of today’s quantum computers have limited capabilities.
Still, they have noted that their development could arrive unexpectedly — just like advances with artificial intelligence — and have started developing some solutions, including top Bitcoin infrastructure firm, Blockstream.
This post Researchers Build First Working Post-Quantum Defense for Bitcoin’s Lightning Network first appeared on Bitcoin Magazine and is written by Mathew Di Salvo.
Bitcoin Magazine
AI Coding Agents Drive Surge in Bitcoin Integration Requests: Breez
Bitcoin software company Breez said demand for its developer tools has surged since AI coding agents went mainstream, with partnership inquiries rising roughly 14-fold as developers, and increasingly the agents they deploy, look to add bitcoin payments to their apps.
In a company blog post, it tied the jump directly to Anthropic’s Claude Code, which launched as a research preview in February 2025 and became generally available three months later.
Before 2025, Breez said, most prospective partners fell into three camps: committed bitcoin enthusiasts, crypto developers, and fintech firms that treat bitcoin as an asset class.
Since Claude Code arrived, the company said, it has heard from many developers with little or no bitcoin experience. Requests have come from fitness apps, messaging apps that want users to send each other money, an eSIM service for travelers, and the team behind a mushroom-identification app.
Breez said many of these developers pick bitcoin for speed. Setting up traditional payment acceptance, including a bank account and cross-border transfers, can take weeks or months, while the company says its SDK can be running within minutes.
Breez said a growing share of inquiries now come from software, not people. The company said it regularly fields requests from coding agents writing on behalf of the companies that deploy them.
The company argues agents favor bitcoin because it is permissionless. An agent can build an app and set up payments for users worldwide without opening a bank account, passing onboarding checks or signing forms.
“Bitcoin is agnostic about whether the code of its current owner and user is composed of DNA base pairs or weights in a neural net,” Breez wrote.
That same absence of gatekeeping has long drawn scrutiny from financial regulators, who require traditional payment providers to verify customers.
Breez said its newest SDK implementation, built on the Bitcoin scaling protocol Spark, handled the added volume without problems.
The company framed the shift as an update to investor Marc Andreessen’s 2011 essay arguing that software is eating the world, saying AI is now eating software. It compared Bitcoin’s role to background infrastructure like electrical sockets and subsea cables.
This post AI Coding Agents Drive Surge in Bitcoin Integration Requests: Breez first appeared on Bitcoin Magazine and is written by Mathew Di Salvo.
Bitcoin Magazine
WhiteBIT Integrates Lightning Network for Fast and Cheap Bitcoin Transactions
The Lightning Network continues to find use cases.
Crypto exchange WhiteBIT announced on Thursday that the platform has integrated the network to help users quickly and efficiently move funds.
Powered by BTC infrastructure provider Voltage, the Swiss exchange said that bitcoin withdrawals and deposits can be made over the network. A number of major exchanges — including Coinbase and Kraken — have integrated the second-layer solution in recent years.
— WhiteBIT (@WhiteBit) October 8, 2026
Faster $BTC transactions via the Lightning Network — using a QR code or payment details.
Deposit fee: 0.25%
Withdrawal fee: 0.15%
Move $BTC at Lightning speed. Learn more: https://t.co/nt0svdMqg5 pic.twitter.com/WHfmRKT6QI
“WhiteBIT’s mission is to make blockchain technology accessible and widely adopted by delivering practical, user-friendly solutions for digital assets,” WhiteBIT Founder and CEO Volodymyr Nosov said in a statement.
“Adding Lightning support brings us closer to this goal as we are making Bitcoin faster and more useful for customers who want to top up accounts, send and receive funds, and use Bitcoin across more real-world flows.”
Zug-based WhiteBIT, the 17th biggest exchange by transaction volume, according to CoinGecko data, added that the launch supports a faster Bitcoin rail with use cases for “remittances, exchange funding, merchant-style QR payments, and interoperability with Lightning-enabled wallets and applications.”
Transaction volume on Lightning has surged this year. The reason, broadly, is that exchanges are using the network to move funds because it’s so cheap and fast.
Launched in 2018, Lightning was previously pushed for smaller transactions like tipping or buying a cup of coffee.
The network also offers more privacy than Bitcoin’s main chain: because Lightning payments are settled off-chain rather than recorded on the public blockchain, individual payments are harder to trace.
This post WhiteBIT Integrates Lightning Network for Fast and Cheap Bitcoin Transactions first appeared on Bitcoin Magazine and is written by Mathew Di Salvo.
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