# STRC and bitcoin-backed instruments > Source: https://timechain.wiki/wiki/strc-and-bitcoin-backed-instruments · TimechainWiki, the Bitcoin encyclopedia. (note · investing) > Strategy's preferred-equity stack — STRK, STRF, STRD, and STRC (all issued in 2025), plus adjacent instruments — is the most-developed Bitcoin-collateralized-securities framework as of 2026. The structural innovation: preferred-equity securities paying USD-denominated dividends (typically 8-10% annual) backed by Strategy's substantial Bitcoin reserves. Investors receive USD income; Strategy retains Bitcoin ownership and services preferred dividends from operational cash flow and Bitcoin-collateralized borrowing rather than Bitcoin sales. Two effects make the stack important: it gives institutional allocators Bitcoin-backed exposure with fixed-income-style yield characteristics suitable for income-oriented mandates, and it monetizes the Bitcoin treasury so that issuance proceeds can fund further Bitcoin acquisition. Adjacent Bitcoin-backed instruments — collateralized lending products, structured notes, emerging Bitcoin-denominated insurance — round out an early-stage category for which Strategy's stack is the principal current case study. --- ## Why this note matters The preferred-equity stack and broader Bitcoin-backed-instruments category represent the principal corporate-finance innovation built on Bitcoin's establishment as institutional asset. Understanding the structure, the institutional logic, and the broader category implications is the precondition for engaging the post-2024 Bitcoin-collateralized-securities landscape. This note treats the Bitcoin-backed-instruments category; [MicroStrategy and Strategy](https://timechain.wiki/wiki/microstrategy-and-strategy.md) treats the principal issuer; [Bitcoin yield products](https://timechain.wiki/wiki/bitcoin-yield-products.md) treats the broader yield-product context. --- ## Strategy's preferred-equity stack The principal current case study: **STRK (Strategy preferred-equity series).** The foundational preferred-equity series; an 8% perpetual preferred launched via an underwritten offering completed February 2025. Backed by Strategy's Bitcoin reserves and operational cash flow. **STRF ("Strife").** A 10% perpetual preferred issued March 2025; similar structure with specific subordination details. **STRD.** A non-cumulative 10% perpetual preferred issued June 2025; junior to STRF in the dividend-priority stack. **STRC ("Stretch").** A variable-rate series issued July 2025 — the largest US IPO of 2025, at roughly $2.5B — with a par-anchored monthly-adjusting dividend designed to trade near $100. **Additional series.** Strategy continues issuing additional preferred-equity series — including the euro-denominated STRE (November 2025) — and the stack grows over time. **The aggregate.** Strategy's total preferred-equity outstanding exceeds $20-30B by 2026; this is a substantial fraction of total Bitcoin-collateralized-securities outstanding globally. The structural mechanics: - **Preferred-equity securities** rank senior to common equity but junior to debt - **USD dividends** paid from operational cash flow plus Bitcoin-collateralized borrowing - **Bitcoin appreciation** flows to common-equity holders (preferred holders receive only USD dividends; no appreciation participation) - **Bear-market protection** depends on Strategy's ability to maintain dividend payments during Bitcoin drawdowns (operational cash flow plus Bitcoin-collateralized borrowing capacity) The investor base: - **Fixed-income institutional allocators** with mandate to seek USD-income securities; the preferred-equity stack provides Bitcoin-backed yield - **Wealth-management allocators** building yield portfolios for retirees and income-focused clients - **Some institutional Bitcoin-curious allocators** who prefer income to appreciation exposure - **Family offices and high-net-worth individuals** seeking diversified Bitcoin-backed exposure The accretive-issuance logic. Strategy issues preferred-equity at par or above; uses proceeds to acquire additional Bitcoin; pays preferred dividends from operational cash flow and Bitcoin-collateralized borrowing. As long as the spread between Bitcoin's long-horizon appreciation and the preferred-dividend yield is positive (which Strategy's thesis requires), the issuance produces positive carry for common equity. This is structurally similar to bank-spread-banking (borrow short, lend long) but operates on Bitcoin appreciation rather than interest-rate spread. --- ## The broader Bitcoin-backed-instruments category Beyond Strategy's preferred-equity stack, the broader category includes: **Bitcoin-collateralized lending.** Companies like Unchained Capital, Ledn, BitFi (and various others) offer USD loans collateralized by Bitcoin held as collateral. Loan-to-value ratios typically 30-50% (conservative; protects against Bitcoin drawdowns). Annual interest rates have varied substantially (8-15%+ historically). The structure: borrowers retain Bitcoin price exposure (loan denominated in USD; Bitcoin appreciation accrues to borrower); lenders earn USD interest. The product is appropriate for Bitcoin holders who want USD liquidity without selling Bitcoin (avoiding capital-gains realization; maintaining long-horizon thesis). Operational concerns: rehypothecation risk (lenders re-pledging Bitcoin collateral); custodial risk (BlockFi 2022 failure as canonical example of operational risk); regulatory risk (specific lending products may face regulatory restrictions). **Bitcoin-backed structured notes.** Various financial institutions offer structured notes with Bitcoin underlying exposure. Notes typically combine Bitcoin price exposure with specific payoff structures (capped upside, downside protection, leverage). Small market currently; growing with institutional adoption. **Bitcoin-denominated insurance.** Emerging category: insurance products denominated in Bitcoin rather than USD. Limited current market; structurally interesting for long-term Bitcoin holders facing USD-denominated alternative. **Bitcoin futures and options.** See [Bitcoin derivatives](https://timechain.wiki/wiki/bitcoin-derivatives.md) — derivatives are technically "Bitcoin-backed" instruments though typically not categorized this way. **Bitcoin-collateralized DeFi protocols.** Various decentralized lending protocols accept Bitcoin (typically wrapped Bitcoin) as collateral. Generally smaller share than centralized lending; the Bitcoin-not-crypto editorial position keeps these adjacent rather than central to the section. --- ## Tradeoffs and design choices **Preferred-equity vs direct Bitcoin holding.** Preferred-equity provides USD income but no Bitcoin appreciation; direct Bitcoin provides appreciation but no income. Different investor profiles favor different products. **Bitcoin-collateralized lending vs Bitcoin sale.** Lending preserves Bitcoin position and Bitcoin upside; sale realizes Bitcoin gains immediately. For long-horizon Bitcoin holders, lending can be tax-advantageous (no capital-gains realization) but introduces rehypothecation and counterparty risk. **Structured-note complexity vs simple Bitcoin exposure.** Structured notes can produce specific payoff profiles but at the cost of complexity, fees, and counterparty risk. For most investors, simple Bitcoin holding (or simple ETF exposure) is preferable. **The "yield from Bitcoin without selling" framing.** Multiple Bitcoin-backed instruments enable yield generation without Bitcoin sales. The framing is attractive but contains specific risks (rehypothecation, counterparty, custody) that vary by product. **The Strategy-specific concentration in preferred-equity.** Strategy is the dominant issuer of Bitcoin-backed preferred-equity. The concentration creates structural concerns: if Strategy faces operational difficulties, the preferred-equity stack value would be affected substantially. Investors should understand this is exposure to Strategy specifically, not to Bitcoin generally. **Capital-structure innovation vs capital-structure complexity.** Strategy's preferred-equity stack is genuinely innovative; the structure also adds capital-structure complexity that creates analytical and operational challenges for investors. **Substantive analytical critique** of broader Bitcoin-backed-instrument dynamics lives in [Custody concentration risks](https://timechain.wiki/wiki/custody-concentration-risks.md) (Criticisms) and adjacent engagement. --- ## Open questions for further development - **Will Strategy's preferred-equity-stack approach be replicated by other companies?** Metaplanet, Semler, and others have not yet developed comparable preferred-equity offerings; the trajectory is unclear. - **What is the long-run sustainability of preferred-equity dividend payments?** Depends on Strategy's operational cash flow and Bitcoin-collateralized borrowing capacity; the structural question. - **How does the broader Bitcoin-collateralized-lending category evolve?** Substantial growth post-2024 ETF approval; the trajectory depends on regulatory clarity and counterparty risk management. - **Will Bitcoin-denominated insurance and similar Bitcoin-native products grow?** Currently very early; the trajectory depends on broader Bitcoin monetary adoption. - **What is the appropriate regulatory framework for Bitcoin-backed structured products?** SEC and CFTC have engaged various Bitcoin-product categories; the framework is still evolving. --- ## Canonical sources for this note - **Strategy investor materials** on preferred-equity stack — primary source - **STRK, STRF, STRC prospectus documents** — security-specific details - **Various Bitcoin-collateralized-lending product disclosures** - **Various academic engagement** with Bitcoin-collateralized securities (very limited) - **Coin Center** structured-product analysis - [The Big Print - Lawrence Lepard](https://timechain.wiki/wiki/the-big-print-lawrence-lepard.md) — adjacent late-cycle-debasement framework - [Speculative Attack - Pierre Rochard](https://timechain.wiki/wiki/speculative-attack-pierre-rochard.md) — corporate-treasury thesis - [Broken Money - Lyn Alden](https://timechain.wiki/wiki/broken-money-lyn-alden.md) — macro framework --- ## Related notes - [MicroStrategy and Strategy](https://timechain.wiki/wiki/microstrategy-and-strategy.md) — principal issuer case study - [Corporate treasury adoption](https://timechain.wiki/wiki/corporate-treasury-adoption.md) — broader phenomenon - [Bitcoin ETFs](https://timechain.wiki/wiki/bitcoin-etfs.md) — adjacent institutional vehicle - [Bitcoin yield products](https://timechain.wiki/wiki/bitcoin-yield-products.md) — adjacent yield category - [Bitcoin derivatives](https://timechain.wiki/wiki/bitcoin-derivatives.md) — adjacent structured-product context - [Bitcoin as a macro asset](https://timechain.wiki/wiki/bitcoin-as-a-macro-asset.md) — macro positioning - [Portfolio approaches to Bitcoin](https://timechain.wiki/wiki/portfolio-approaches-to-bitcoin.md) — framework anchor - [Centralized exchanges](https://timechain.wiki/wiki/centralized-exchanges.md) — operational venue context - [Custody concentration risks](https://timechain.wiki/wiki/custody-concentration-risks.md) — substantive analytical engagement (home: criticisms) - [The ETF approval and Wall Street capture debate](https://timechain.wiki/wiki/the-etf-approval-and-wall-street-capture-debate.md) — adjacent controversy (home: controversies) - [Strategic Bitcoin Reserve concept](https://timechain.wiki/wiki/strategic-bitcoin-reserve-concept.md) — adjacent sovereign-policy (home: regulation) - [Bitcoin and dollar hegemony](https://timechain.wiki/wiki/bitcoin-and-dollar-hegemony.md) — adjacent macro framework (home: regulation) - [Tax treatment of Bitcoin](https://timechain.wiki/wiki/tax-treatment-of-bitcoin.md) — tax context (home: regulation) - [Wall Street securitization of Bitcoin](https://timechain.wiki/wiki/wall-street-securitization-of-bitcoin.md) — institutional history (home: history) - [Mt. Gox](https://timechain.wiki/wiki/mt-gox.md) — formative custodial-failure (home: history) - [Public Bitcoin miners landscape](https://timechain.wiki/wiki/public-bitcoin-miners-landscape.md) — adjacent corporate sector (home: mining) - [Bitcoin banking and credit](https://timechain.wiki/wiki/bitcoin-banking-and-credit.md) — adjacent banking-and-credit framework (home: economics) - [Speculative Attack - Pierre Rochard](https://timechain.wiki/wiki/speculative-attack-pierre-rochard.md) — foundational thesis paper - [The Big Print - Lawrence Lepard](https://timechain.wiki/wiki/the-big-print-lawrence-lepard.md) — late-cycle framework - [Broken Money - Lyn Alden](https://timechain.wiki/wiki/broken-money-lyn-alden.md) — macro framework - [The Bitcoin Standard - Saifedean Ammous](https://timechain.wiki/wiki/the-bitcoin-standard-saifedean-ammous.md) — monetary foundation - [Michael Saylor](https://timechain.wiki/wiki/michael-saylor.md) — Strategy architect - [Pierre Rochard](https://timechain.wiki/wiki/pierre-rochard.md) — corporate-treasury thesis analyst - [Caitlin Long](https://timechain.wiki/wiki/caitlin-long.md) — banking-infrastructure context - [Larry Lepard](https://timechain.wiki/wiki/larry-lepard.md) — late-cycle Bitcoin-allocation - [Lyn Alden](https://timechain.wiki/wiki/lyn-alden.md) — macro framework - [Saifedean Ammous](https://timechain.wiki/wiki/saifedean-ammous.md) — monetary framework