Michael Saylor has reignited a long-running debate over Bitcoin custody after a public back-and-forth with Casa co-founder and CTO Jameson Lopp about whether institutional custodians can rehypothecate — or re-use — clients’ BTC.
The spat began after MicroStrategy’s Jan. 26 disclosure that the company bought 2,932 BTC for roughly $264.1 million (an average price of about $90,061 per coin). The filing also said that as of Jan. 25 MicroStrategy held 712,647 BTC, purchased for roughly $54.19 billion at an average cost near $76,037 each. The disclosure came amid an accelerating accumulation push: analyst Jesse Myers noted MicroStrategy had acquired 40,150 BTC so far in 2026 versus about 11,700 BTC mined year-to-date, arguing the scale of buying is structurally tightening supply and implying “the BTC price must go higher.”
That premise — that large institutional purchases translate into unencumbered, uniquely held UTXOs — was immediately questioned by Lopp. “Your thesis is sensible… under the assumption that he’s buying real bitcoin,” Lopp wrote, asking whether MicroStrategy actually verifies its bitcoin isn’t rehypothecated by third parties. “Does Strategy actually verify that their bitcoin only belongs to them and isn’t rehypothecated? I’m skeptical.”
Saylor’s initial reply was blunt: “We buy real bitcoin. We don’t rehypothecate.” As the thread unfolded, Lopp broadened the issue from MicroStrategy’s own practices to the incentives and opacity of intermediaries. He pressed what many in the space have been asking for years: what do auditors and custodians actually verify? Do they run nodes, confirm balances at specific addresses, and ensure no other client can claim the same coins — or do multiple layers of “trusted black boxes” introduce unspoken risk?
The exchange drew supporters on both sides. Some users demanded MicroStrategy publish addresses as a direct proof-of-reserve. Others warned that on-chain disclosure could create attack vectors or unsettle traditional financial counterparties. Attorney Jesse Kobernick of Miller Nash LLP defended the company’s controls, pointing to public filings that describe auditor procedures and the separation of BTC purchases from the equity sales and cash flows that fund them. Bitcoin pioneer Adam Back also pushed back on “paper bitcoin” fears, noting that major custodians like Coinbase and Fidelity — believed to be among MicroStrategy’s custodians — adhere to strict key-control and audit standards.
Lopp, however, remained unconvinced that outside observers can reliably know what’s being verified. “Are these auditors spinning up nodes, verifying balances at addresses, ensuring that no clients hold claims to the same BTC?” he wrote. “I’m skeptical, but ultimately we just don’t know — it’s a black box.”
Saylor later broadened his message into a prescriptive stance: “We buy real bitcoin. We audit our custodians. We don’t rehypothecate. You shouldn’t either.” The exchange highlights a recurring tension in crypto: institutional adoption and large-scale accumulation bring liquidity and demand, but they also revive questions about custody practices, proof-of-reserves, and how much transparency is realistic — or safe — for public companies.
At press time, Bitcoin traded around $88,001.
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