Institutional trading and lending desk Secure Digital Markets (SDM) said it sent a $1 million payment to cryptocurrency exchange Kraken over the Lightning Network on Jan. 28.
SDM claimed in a Thursday statement shared with Cointelegraph that it is the largest publicly reported Lightning transaction to date and a proof‑of‑concept for seven‑figure transfers between regulated counterparties.
The payment cleared in 0.43 seconds and was routed via Voltage’s managed Lightning infrastructure, which provides node management, pre‑provisioned liquidity, and uptime guarantees aimed at exchanges and trading desks.
The previously publicized “record” single payment milestone was about 1.24 Bitcoin (BTC), roughly $140,000 at the time, highlighting the rarity of six‑figure Lightning payments, let alone a clean, seven‑figure transfer in one shot.
Voltage CEO Graham Krizek called the transaction an “important moment for Lightning and for institutional Bitcoin payments,” saying that a $1 million Lightning transfer highlighted the “its ability to meet enterprise requirements.”
Related: Lightning Network could nab 5% of stablecoin flows by 2028: Voltage CEO
Lightning metrics remain small, but growing
The transfer comes against a backdrop of mixed Lightning metrics. Capacity on public Lightning channels fell from over 5,400 BTC in late 2023 to about 4,200 BTC by mid 2025, before rebounding to a new all-time high capacity of over 5,600 BTC by December.
That’s still a small pool of capital relative to Bitcoin’s market value, and most documented usage has skewed toward smaller payments.
Bitfinex, for example, had long capped Lightning deposits at 0.04 BTC before recently lifting limits to 0.5 BTC per payment and 2 BTC per channel.
Fidelity and Blockstream see institutional potential
Fidelity Digital Assets, which published a 2025 report on Lightning using Voltage data, argued that the Lightning Network not only enhanced Bitcoin’s utility but also bolstered its investment case.
Related: Tether leads $8M funding for Lightning startup focused on stablecoins
Fidelity noted that average Lightning capacity had increased by 384% since 2020, adding that the network presented a “transformative opportunity for both new and existing financial institutions.”
Blockstream, a Bitcoin‑focused infrastructure company, pushed a similar narrative in its Q4 2025 quarterly update.
The company highlighted Core Lightning releases focused on latency reduction and Lightning Service Provider (LSP) support, and pitched its Greenlight platform as a way for apps, exchanges and services to offer trust‑minimized Lightning functionality with minimal infrastructure burden, with an explicit roadmap for enterprise‑focused Lightning deployments.
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