API REST construida con NestJS que integra almacenamiento descentralizado en IPFS (via Pinata) con minteo automático de NFTs en Somnia Network (blockchain EVM).
Producción: https://backend-blockchain-sapiens-lab.vercel.app
- Arquitectura
- Cómo funciona
- Blockchain — Somnia Network
- Variables de entorno
- Endpoints
- CORS
- Instalación y ejecución
Cliente (Frontend)
│
▼
NestJS API ──────────────────────────────────────┐
│ │
├─► PinataService │
│ └─ Pinata SDK v2 │
│ └─ IPFS (archivos públicos) │
│ │
└─► BlockchainService │
└─ ethers.js v6 │
└─ Somnia Shannon Testnet (RPC) │
└─ Contrato ERC-721 │
Stack:
- NestJS 11 — framework HTTP
- Pinata SDK 2 — almacenamiento IPFS
- ethers.js 6 — interacción blockchain
- Somnia Network — blockchain EVM de destino
Cuando se llama a POST /pinata/upload-json, ocurre lo siguiente en orden:
1. El cliente envía: { name, description, attributes[] }
│
▼
2. Se construye el JSON de metadatos NFT:
{
name, description,
image: "<URL fija en Pinata>",
attributes: [...]
}
│
▼
3. PinataService sube el JSON a IPFS de forma pública
→ Devuelve CID + public_url
│
▼
4. BlockchainService.safeMint(public_url)
→ Firma y envía la transacción con la wallet auto-custodia
→ Espera confirmación en la blockchain
→ Extrae el tokenId del evento Transfer
│
▼
5. Se devuelve al cliente:
{
tokenUrl: "https://shannon-explorer.somnia.network/token/.../instance/<tokenId>",
ipfs: { cid, public_url, gateway_url, ipfs_url },
nft: { tokenId, transactionHash, blockNumber, gasUsed, mintedTo, uri },
explorer: { contractUrl, tokenUrl, transactionUrl }
}
| Campo | Valor |
|---|---|
| Nombre | Somnia Shannon Testnet |
| RPC URL | configurado en RPC_URL (variable de entorno) |
| Explorador | https://shannon-explorer.somnia.network |
| Token nativo | STT |
| Campo | Valor |
|---|---|
| Dirección | 0xE16EcfeE6067B4918AF3eAF09Dd134FFdaE92D4D |
| Estándar | ERC-721 |
| Función usada | safeMint(address to, string uri) |
| Ver contrato | https://shannon-explorer.somnia.network/token/0xE16EcfeE6067B4918AF3eAF09Dd134FFdaE92D4D |
El servicio usa una wallet cuya clave privada está en la variable PRIVATE_KEY. Esta wallet:
- Firma todas las transacciones de minteo
- Es la destinataria (
to) de los NFTs minteados - Necesita tener balance de STT para pagar el gas
El tokenId se extrae del evento Transfer(address from, address to, uint256 tokenId) que emite el contrato al mintear.
https://shannon-explorer.somnia.network/token/0xE16EcfeE6067B4918AF3eAF09Dd134FFdaE92D4D/instance/<tokenId>
Crea un archivo .env en la raíz del proyecto:
# Pinata — IPFS
PINATA_JWT=tu_jwt_de_pinata
GATEWAY_URL=https://tu-gateway.mypinata.cloud
# Blockchain — Somnia Network
RPC_URL=https://dream-rpc.somnia.network
PRIVATE_KEY=tu_clave_privada_sin_0x
CONTRACT_ADDRESS=0xE16EcfeE6067B4918AF3eAF09Dd134FFdaE92D4D
# Servidor
PORT=3000Obtén tu JWT en app.pinata.cloud/developers/keys.
Sube metadatos a IPFS y mintea el NFT automáticamente.
Body:
{
"name": "Mi NFT",
"description": "Descripción del NFT",
"attributes": [
{ "trait_type": "Color", "value": "Azul" }
]
}Respuesta:
{
"success": true,
"message": "JSON subido a IPFS y NFT minteado exitosamente en Somnia Network",
"tokenUrl": "https://shannon-explorer.somnia.network/token/0xE16EcfeE6067B4918AF3eAF09Dd134FFdaE92D4D/instance/6",
"ipfs": {
"cid": "bafybei...",
"public_url": "https://ipfs.io/ipfs/bafybei...",
"gateway_url": "https://gateway.pinata.cloud/ipfs/bafybei...",
"ipfs_url": "ipfs://bafybei..."
},
"nft": {
"tokenId": "6",
"transactionHash": "0xabc...",
"blockNumber": 1000000,
"gasUsed": "85000",
"mintedTo": "0xTuWallet...",
"uri": "https://ipfs.io/ipfs/bafybei..."
},
"explorer": {
"contractUrl": "https://shannon-explorer.somnia.network/token/0xE16EcfeE6067B4918AF3eAF09Dd134FFdaE92D4D",
"tokenUrl": "https://shannon-explorer.somnia.network/token/0xE16EcfeE6067B4918AF3eAF09Dd134FFdaE92D4D/instance/6",
"transactionUrl": "https://shannon-explorer.somnia.network/tx/0xabc..."
}
}Sube un archivo binario a IPFS.
Body: multipart/form-data con campo file.
Mintea un NFT usando una URI ya existente (por ejemplo, un public_url previo).
Body:
{ "uri": "https://ipfs.io/ipfs/bafybei..." }Recupera un archivo de IPFS por su CID.
Recupera un JSON de IPFS por su CID.
Lista todos los archivos subidos a Pinata.
Elimina un archivo de Pinata por su ID.
La API acepta solicitudes únicamente desde los siguientes orígenes:
| Origen |
|---|
https://sapientlab.vercel.app |
http://localhost:3000 |
http://localhost:5173 |
https://sapient-lab-api-fkadhxgthve3hycv.eastus-01.azurewebsites.net |
# Instalar dependencias
npm install
# Desarrollo con hot-reload
npm run start:dev
# Producción
npm run build
npm run start:prodLa API quedará disponible en http://localhost:3000 (o el PORT que configures).
# unit tests
$ npm run test
# e2e tests
$ npm run test:e2e
# test coverage
$ npm run test:covWhen you're ready to deploy your NestJS application to production, there are some key steps you can take to ensure it runs as efficiently as possible. Check out the deployment documentation for more information.
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