BTCFi on Stellar
Costa Rica / Colombia
Joined July 2026
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Bitcoin SPV inside a Soroban contract, in one picture.
The contract does not call a Bitcoin node.
The caller brings 6 headers, a Merkle proof, and the raw transaction.
The contract checks the math.
A liquidator has to learn one thing: the position is under the line.
They do not have to learn the size, the debt, or who you are.
Should they get a proof, or a public health factor?
The proofs on testnet come from a dev ceremony. One contributor.
That key is not a mainnet key. A real ceremony needs people who do not trust us, and who delete their randomness when the round is over.
Documented as a single-contributor dev ceremony. Those keys do not go to mainnet.
docs.writz.xyz/developers/ru…
Liquidez sin perder el rendimiento de tu BTC
¿Y si pudieras pedir USDC prestado sin vender tu Bitcoin?
Conoce a Writz: un protocolo de préstamos respaldados en BTC sobre Stellar, sin bridges, sin wrapping y sin custodios. Tu BTC se queda en Bitcoin. @WritzProtocol ⭐
The testnet app is public.
What works today is on the site. What does not work yet is also on the site.
We will not paper over that.
Site: writz.xyz
App: testnet.writz.xyz/
Docs: docs.writz.xyz/docs/architec…
Code: github.com/WritzProtocol/wri…
Do you know what Writz is?
Come say hi to us during HackMeridian and Meridian.
We love connecting with the community!
What if you could borrow USDC without selling your Bitcoin?
Writz is a BTC-backed lending protocol on blockchain with no bridging, wrapping or custodians, so your BTC stays on Bitcoin. Meet the team at HackMeridian 🇵🇹 @WritzProtocol
Presidente @nayibbukele, le escribimos con una propuesta concreta.
Somos Writz Protocol, una startup de cuatro latinoamericanos, de Costa Rica y Colombia, que construye infraestructura financiera para Bitcoin sobre Stellar.
El dato que nos trae aquí: El Salvador mantiene una reserva de más de 7,800 BTC, cerca de US$650 millones a precio de hoy. Y el país está invirtiendo en grande: al 14 de agosto, Dos Escuelas por Día sumaba 900 centros escolares intervenidos y US$858 millones invertidos.
Writz permite usar bitcoin como garantía sin venderlo:
- El BTC nunca sale de la red Bitcoin. Queda bloqueado en un script que nadie puede mover por su cuenta. Sin custodio, sin puentes, sin tokens envueltos.
- Un contrato en Stellar verifica ese bloqueo contra la propia cadena de Bitcoin y entrega dólares digitales (USDC).
- Al pagar, el BTC se libera. Si el protocolo dejara de existir, el dueño recupera su BTC por sí solo al vencer el plazo.
Un ejemplo con números: 100 BTC, con una garantía conservadora del 200%, respaldan unos US$4.2 millones en USDC. Eso equivale a cuatro escuelas al costo promedio del programa.
Por eso queremos ofrecerle firmar una carta de intención no vinculante (LOI) para diseñar un piloto: liquidez en stablecoins para seguir invirtiendo en escuelas, agua y electricidad, sin que el país venda su bitcoin. Hoy estamos en testnet, con lanzamiento en mainnet previsto para 2027 tras una auditoría externa.
Ayúdanos a que esta propuesta llegue a la mesa:
1. Dale repost.
2. Comenta mencionando a @nayibbukele y @PresidenciaSV .
#ElSalvador #Bitcoin
Privacy on Writz, without the slide version.
We have ZK work on testnet. We will not say your position is hidden on mainnet until that is the product you can click.
Two contracts, on purpose. One is a non-ZK lending path. One is a commitment-tree path with Groth16.
They were built to be separable. Launch order is a product decision. It is not a post.
Architecture: docs.writz.xyz
What we are actually building.
The core is BTC-collateral lending on Stellar: SPV in, USDC out.
In parallel, Instaward 1 is a scoped USDC Earn sprint. That sprint is not a rebrand of Writz.
Most lending protocols publish your collateral, your debt, and how close you are to liquidation.
Should a DeFi position be a public billboard?
Wrapped BTC is an IOU.
A good IOU is still an IOU. An issuer holds BTC and mints a token on another chain.
Writz is a script on Bitcoin and a verifier on Soroban. The collateral never becomes a token named BTC.
How the BTC gets locked.
A P2WSH output on Bitcoin. Two paths out. Only two.
Path A: you and the protocol sign.
Path B: the timelock expires, you sign alone.
The relayer is public on testnet: api.testnet.writz.xyz
Give it a txid. It returns the headers and the proof shaped for the call.
Docs: docs.writz.xyz