BTCfi Market
Growth trajectory
Bitcoin DeFi has been one of the breakout trends of the 2024–2025 cycle:
That is a 28x growth in 18 months. The market is expanding fast and still early.
What is driving growth
- Bitcoin holders want to generate yield without selling BTC or giving up custody
- Institutional interest in BTC-collateralized lending (cleaner regulatory profile than altcoins)
- Maturing cross-chain infrastructure making BTC accessible on other chains
- Bitcoin’s “digital gold” narrative evolving toward “productive asset”
Current BTCfi players
Key observation (updated 2026-08-04): Ethereum and Bitcoin L2/sidechains still dominate BTCfi by volume, but the “None are on Stellar” claim from the original June survey is no longer accurate and should not be reused as-is. Two Stellar-relevant players now exist:
- Solv Protocol already runs an audited SolvBTC deployment on Soroban mainnet with real trading volume ($179K/day Q4 2025 → $372K/day Q1 2026 per Messari). It is fully custodial/wrapped, not privacy-preserving - it doesn’t compete with Writz’s trust model, but it kills the “we’re the only BTCfi thing on Stellar” talking point.
- Templar Protocol is the sharper risk: it already proved native-BTC lending without wrapping on NEAR (via Bitcoin light client + MPC chain signatures, $4M pre-seed, audited, mainnet), and separately already has a live, Halborn-audited Soroban vault on Stellar (via Blend, currently XLM-collateral only) plus a cross-chain bridge (
omni-sdk) that explicitly lists Stellar among its supported chains. They have not yet connected native BTC collateral to the Stellar vault - but all the components exist in their own GitHub org today, and their corecontractsrepo is under active daily development.
Privacy Market
Why privacy matters in DeFi
Public blockchain DeFi has a fundamental problem: every position, every trade, every liquidation threshold is visible to anyone. This creates:- Front-running: Bots watch liquidation thresholds and exploit them
- Competitive intelligence leakage: Institutional players don’t want competitors seeing their positions
- Personal financial exposure: Individuals don’t want their net worth and borrowing behavior public
- Regulatory uncertainty: Some jurisdictions treat DeFi activity differently based on public visibility
Privacy in crypto - 2026 state
Zero-knowledge proofs have moved from experimental to practical infrastructure:- Proof generation is orders of magnitude faster than 2022 - GPU/FPGA-accelerated provers produce basic proofs in milliseconds
- ZK has gone from research tool to production infrastructure (Starknet, zkSync, Aztec, etc.)
- The regulatory conversation has shifted toward “selective transparency” - private by default, auditable on request
Stellar’s privacy position
Stellar launched Protocol X-Ray in January 2026, making it uniquely positioned:
Stellar is the only major blockchain with ZK privacy infrastructure that is simultaneously compliance-friendly. This is critical for institutional adoption.
Stellar Ecosystem
Key metrics (2025–2026)
- USDC volume: $500M/month on Stellar - the dominant stablecoin, real usage not speculation
- Network operations: Surpassed 1 billion network operations in Q3 2025
- Soroban maturity: Smart contracts moved from early experimentation to production-grade deployments
- RWA tokenization: Hit $3B target set by SDF
- Protocol 23 (Whisk, Sep 2025): Parallel smart contract execution - significantly faster network
DeFi protocols on Stellar
Gap (revised 2026-08-04): No protocol on Stellar handles real, non-custodial BTC (native UTXO, SPV-verified, no wrapping) as collateral. Solv fills the “some form of BTC exists on Stellar” gap with a fully custodial wrapped token. Templar has live Soroban infrastructure plus proven native-BTC-without-wrapping tech (on NEAR) but has not yet combined the two. The specific gap Writz occupies - trustless SPV-verified native BTC + ZK-private positions, on Stellar - is still open.
USDC + Stellar = unique combination
USDC is the world’s most regulated and trusted stablecoin. On Stellar, USDC is natively issued by Circle - not bridged. This means:- No bridge risk on the USDC side
- Stellar USDC is the same USDC that businesses already use for payments, remittances, and treasury
- Users borrowing USDC on Writz are getting a real, liquid, institutionally recognized asset
Competitive Analysis
Direct competitors to Writz Protocol
Nobody is building exactly what Writz is building. The closest analogues are: On privacy + DeFi: Aztec Network (Ethereum), Penumbra (Cosmos) - but none handle BTC natively and none are on Stellar. On BTCfi: Stacks, RSK, Interlay - but none have ZK privacy and none are on Stellar. On Stellar DeFi: Blend - but no BTC support and no privacy.Indirect competitors
The competitive moat
Writz’s moat is technical first-mover advantage in a specific niche:- First Bitcoin SPV client on Soroban - takes 12–18 months to build and audit
- First integration of Stellar’s ZK privacy (Protocol X-Ray) with BTC collateral
- Open SDK creates ecosystem lock-in - once Stellar wallets/protocols build on Writz SPV, switching is costly
Update - 2026-08-04: Solv Protocol + Templar Protocol findings
Deeper research (prompted by evaluating a potential Solv integration) surfaced two corrections to the picture above: Solv Protocol is live on Stellar Soroban mainnet (solv-finance/SolvBTC-Stellar-Contract, audited, real trading volume). It does not threaten Writz’s moat directly - SolvBTC is custodial (third-party custodians + FROST threshold-signature reserve, NAV oracle, blacklist/pausable token) and serves the opposite customer flow (USDC holders wanting BTC-denominated yield, not BTC holders wanting private loans). Its relevance is narrative, not architectural: it retires the “nothing BTC-related exists on Stellar” talking point and means Writz has to lead with “trustless + private,” not “first.”
Templar Protocol is a more serious signal. On NEAR, it already runs a mainnet, audited, $4M-pre-seed-funded lending product that takes native BTC as collateral with no wrapping, using a Bitcoin light client plus MPC/chain-signature threshold custody (NEAR’s chain-abstraction stack) instead of Writz’s SPV-proof + P2WSH-covenant approach - architecturally different (MPC threshold trust vs. pure cryptographic verification) but marketed with similar “no custodian, no wrapping” language. Separately, Templar already has a live, Halborn-audited Soroban vault on Stellar (via a Blend lending-market adapter, part of Upshift’s multi-chain vault rollout), currently limited to XLM collateral. Its own omni-sdk bridge already lists Stellar among its 10+ supported chains, and its core contracts repo shows same-day commit activity as of this writing. Templar has not yet routed native BTC collateral into its Stellar vault - but every component needed to do so (BTC light client, MPC custody, cross-chain bridge with Stellar support, audited Soroban vault) already exists in their GitHub org. This is the most credible fast-follower risk identified so far - closer and faster-moving than Babylon Labs (no Stellar presence at all) precisely because Templar’s Stellar infrastructure is already shipped, audited, and live; only the BTC-collateral wiring is missing.
Corrected 2026-10-26: this update originally called the combination of native-BTC verification without wrapping and ZK-private position sizes Writz’s “unreplicated core claim”. That no longer describes the product: Writz v1 has no privacy (positions are public on chain; privacy is a separate, later edition), and its cooperative release path uses a protocol co-signing key. The differentiator Writz states is native BTC collateral without custody or wrapping: the BTC stays in the user’s own script with a time-locked exit to the user’s key alone, and Stellar verifies it through an SPV light client. Babylon also keeps Bitcoin in the owner’s own script with a time-lock exit, so Writz does not claim a stronger custody guarantee than Babylon; it differs by lending against that Bitcoin on Stellar. What this update found still holds: Templar shortens the window before someone else assembles the pieces.
Market Sizing
Total Addressable Market (TAM)
BTCfi TAM: $8.6B TVL and growing. If Writz captures 5% of BTCfi TVL by 2028, that is $430M+ in TVL. Protocol revenues at 1–2% annualized on TVL = $4.3M–$8.6M/year from lending alone. Privacy DeFi TAM: The privacy DeFi category is emerging. Aztec raised $100M. Penumbra raised $23M. The market for private financial infrastructure is early but large. LATAM remittances (future product): $150B/year market where Stellar already has distribution. BTC→USDC private remittances would be a natural extension after the core protocol is established.Serviceable Addressable Market (SAM)
Near-term realistic targets:- Bitcoin holders on Stellar-adjacent ecosystems (existing Stellar users with BTC)
- Privacy-conscious individuals in LATAM with BTC savings
- Crypto-native companies needing ZK Proof of Reserve (post-FTX demand is structural)
- Stellar DeFi protocols wanting BTC exposure
Timing Assessment
Why now:- Protocol X-Ray launched January 2026 - the ZK infrastructure is production-ready TODAY
- BTCfi is in a growth phase - early but proven market
- Stellar has real USDC liquidity - not a chicken-and-egg problem on the output side
- Soroban has matured - Protocol 23 brought parallel execution; smart contracts are production-grade
- The summa-tx Rust SPV library exists - no need to build cryptographic primitives from scratch
Last updated: 2026-08-04 (Solv Protocol + Templar Protocol competitive findings added - original survey dated 2026-06-22)