MARA's Slipstream is now available as a permissionless public service, requiring no client software. This service is particularly important for users transferring funds from vulnerable COLDCARD wallets. Multi-signature expenditures expose all public keys and spending conditions; if the transaction enters the public mempool, attackers can immediately compare these keys with their pre-computed weak COLDCARD private key database and broadcast a double-spend transaction with higher fees before the transaction is confirmed, provided they control the majority of the keys. Slipstream submits transactions directly to miners, avoiding entry into the public mempool before being mined. MARA recommends using conservative fees to prevent transactions from getting stuck. Aside from standard Bitcoin network fees, this service is currently free.
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Banco Santander's Form 13F-HR, filed July 29, 2026, reports 129,615 shares of BlackRock's iShares Bitcoin Trust worth $4.31M as of June 30 — its first-ever disclosed spot-bitcoin-ETF position, alongside a first ether-ETF holding. What the filing shows is a quarter-end snapshot of ETF shares; what it does not show is motive, or bitcoin on the bank's balance sheet.




Agave v4.2 targets mainnet feature activations on 17 August 2026, but the slot-time change is only step one of a five-step reduction — 400ms to 350ms, not the 200ms end state. Alpenglow's complete code ships with this release; its activation is set for v4.3.






