TL;DR
- SDM says it sent $1 million to Kraken over Lightning on Jan. 28, calling it the largest reported payment and a clean proof point.
- The transfer cleared in 0.43 seconds via Voltage infrastructure, and executives framed it as an enterprise KPI versus the prior record near $140,000.
- Lightning capacity fell from 5,400 BTC to 4,200 BTC by mid 2025, then rebounded above 5,600 BTC; exchanges and firms cite institutional upside.
A $1 million Bitcoin Lightning payment between Secure Digital Markets (SDM) and Kraken has put institutional readiness for Bitcoin’s main scaling layer under a brighter spotlight. This transfer repositions Lightning as a credible settlement rail for regulated counterparties. SDM said the Jan. 28 transaction is the largest publicly reported Lightning payment to date and a proof of concept for seven figure value moving in a single shot. SDM added the payment cleared in 0.43 seconds and was routed through Voltage’s managed Lightning infrastructure, designed for uptime and pre provisioned liquidity, for institutional payment routing.
From headline milestone to operational roadmap
Voltage CEO Graham Krizek called the payment an important moment for Lightning and for institutional Bitcoin payments, arguing the network can meet enterprise requirements at meaningful size. The milestone is being framed as a KPI for treasury and trading desks evaluating new rails. SDM contrasted the test with the previously publicized record single payment of about 1.24 BTC, roughly $140,000 at the time, underscoring how uncommon six figure Lightning transactions have been. The parties positioned the exercise as a controlled proof point, not a marketing stunt, with clear audit trails and predictable controls throughout.
The seven figure test lands amid mixed network metrics that are improving but still small versus Bitcoin’s overall market value. Lightning capacity has been volatile, then pushed into a new high that supports bigger ambitions. Public channel capacity fell from over 5,400 BTC in late 2023 to about 4,200 BTC by mid 2025, before rebounding above 5,600 BTC by December globally today. Documented usage has tilted toward smaller payments, although exchange limits are gradually loosening. Bitfinex lifted Lightning deposit caps from 0.04 BTC to 0.5 BTC per payment and 2 BTC per channel.
Institutional narratives are being reinforced by incumbents and infrastructure providers focused on reliability, cost, and operational efficiency. The industry is shifting from experimentation to production grade Lightning adoption playbooks. Paolo Ardoino, CEO of Tether and CTO of Bitfinex, said Lightning can handle higher volumes with predictable settlement, lower costs, and reduced onchain congestion, which matter for institutional use cases. Fidelity Digital Assets noted average Lightning capacity is up 384% since 2020 and called it transformative for financial institutions. Blockstream highlighted Core Lightning work on latency and LSP support, plus Greenlight for lean deployments.
