
DeFi3 min read
Spark Vulnerability Mitigated
A vulnerability was identified via responsible disclosure and has been mitigated in the Spark protocol. It affects multi-input Spark spends only; single-input spends are unaffected. Your wall
MARA Holdings sent 7,500 BTC, worth roughly $480 million, to a wallet tagged “Two Prime” over the past several hours, per Arkham Intelligence data, in 15 transactions of 500 BTC each. MARA ho

MARA Holdings sent 7,500 BTC, worth roughly $480 million, to a wallet tagged “Two Prime” over the past several hours, per Arkham Intelligence data, in 15 transactions of 500 BTC each. MARA holds 36,303 BTC total as of Aug. 3, so this transfer moves about 21% of that balance.
In July 2025, MARA led a $20 million investment in Two Prime, joined by additional participation from Susquehanna Crypto, and expanded the Bitcoin allocation it runs through the firm from 500 BTC to 2,000 BTC.
Two Prime is an SEC-registered investment advisor managing roughly $1.75 billion in institutional trading, lending, and Bitcoin yield strategies, with its lending arm ranked the largest CeFi lender in the United States in Galaxy Research’s Q1 2025 report on crypto leverage.
MARA Transfers 7,500 BTCThis is the second time in six months MARA has routed a large batch of BTC to Two Prime under the same shrug of a caveat. On Feb. 6, 2026, MARA moved 1,318 BTC (~$86.9 million) to Two Prime, BitGo, and Galaxy Digital over a 10-hour window.
MARA rewrote its 2026 treasury policy to allow selling Bitcoin held anywhere on its balance sheet. That’s the policy change that made this kind of large-scale movement possible at all.
It’s already used that authority once at scale: between March 4 and March 25, MARA sold 15,133 BTC for roughly $1.1 billion specifically to repurchase $1 billion of convertible notes at a 9% discount, cutting convertible debt by about 30%. Across the full first quarter, MARA sold 20,880 BTC (~$1.5 billion) and ended the period holding 35,303 BTC.