feat: Textile EVM storage and decentralized identity bridge (resolves #213)

bridges/evm-storage-bridge/.gitignore

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+node_modules/
+dist/
+package-lock.json
+*.log

bridges/evm-storage-bridge/README.md

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+# Textile EVM Storage Bridge
+
+A decentralized identity and off-chain storage bridge connecting EVM networks (Ethereum, Polygon, Arbitrum, Base) to Textile Hub Buckets, ThreadDB, and Filecoin storage deals.
+
+## Overview
+
+The Textile EVM Storage Bridge solves the interoperability barrier between EVM smart contracts and Textile distributed storage infrastructure. It provides:
+
+1. **Deterministic Decentralized Identity (DID):** Derives Libp2p/Ed25519 identity keypairs deterministically from standard EVM wallet signatures (EIP-191 and EIP-712). Users control their Textile Buckets and ThreadDB instances directly from MetaMask or any Web3 wallet without managing separate seed phrases.
+2. **On-Chain Storage Anchoring:** An EVM smart contract (`TextileStorageBridge.sol`) that records dataset CIDs, bucket associations, size metrics, and Filecoin storage deal metadata on-chain.
+3. **Cryptographic Oracle Attestation:** Secp256k1 oracle signing certifying that off-chain data has been persisted and verified against its content-addressed root CID before state transitions are executed on-chain.
+4. **EIP-712 Storage Intents:** Gasless or relayed storage authorizations signed by dataset owners and verified cryptographically.
+
+## Architecture
+
+```
++-------------------+        EIP-191 / EIP-712 Sign        +-----------------------------+
+|    EVM Wallet     | -----------------------------------> | TextileEvmBridge (Identity) |
+| (MetaMask / Web3) |                                      |  - Deterministic PBKDF2     |
++-------------------+                                      |  - RFC 8410 Ed25519 Keypair |
+          |                                                +-----------------------------+
+          |                                                               |
+          | Data Staging                                                  | Authenticated API Access
+          v                                                               v
++-------------------+      Attestation Request             +-----------------------------+
+| Textile Buckets / | -----------------------------------> |        Textile Hub          |
+|     ThreadDB      |                                      |   (IPFS / Filecoin Deals)   |
++-------------------+                                      +-----------------------------+
+          |                                                               |
+          | Proof Generation                                              | Storage Deal Activation
+          v                                                               v
++-------------------+      verifyAndAnchorAttestation      +-----------------------------+
+|   TextileOracle   | -----------------------------------> |    TextileStorageBridge     |
+| (secp256k1 Sign)  |                                      |   (Solidity Smart Contract) |
++-------------------+                                      +-----------------------------+
+```
+
+## Core Modules
+
+| Module | File | Description |
+| :--- | :--- | :--- |
+| **Types** | `src/types.ts` | Shared type definitions for identities, datasets, deals, and attestations |
+| **Identity** | `src/identity.ts` | Deterministic Ed25519 derivation, EIP-191 challenges, and EIP-712 verification |
+| **Oracle** | `src/oracle.ts` | Secp256k1 attestation generation, verification, and nonce progression |
+| **Bridge** | `src/bridge.ts` | Coordinator linking Hub storage, CID computation, and contract calldata |
+| **Contract** | `src/contracts/TextileStorageBridge.sol` | Solidity registry enforcing access control and attestation verification |
+
+## Getting Started
+
+### Prerequisites
+
+- Node.js >= 18.0.0
+- npm >= 9.0.0
+
+### Installation
+
+```bash
+cd bridges/evm-storage-bridge
+npm install
+```
+
+### Build
+
+```bash
+npm run build
+```
+
+### Test Suite Execution
+
+Run the complete cryptographic and integration test suite:
+
+```bash
+npm test
+```
+
+## Usage Example
+
+```typescript
+import { Wallet } from "ethers";
+import { TextileEvmBridge, TextileOracle } from "@textile/evm-storage-bridge";
+
+const chainId = 137;
+const contractAddress = "0x1111111111111111111111111111111111111111";
+const oracleWallet = Wallet.createRandom();
+const userWallet = Wallet.createRandom();
+
+const bridge = new TextileEvmBridge({
+  hubHost: "https://api.hub.textile.io",
+  chainId,
+  contractAddress,
+  oracleAddress: oracleWallet.address,
+});
+
+const identity = await bridge.authenticateWallet(userWallet);
+
+const dataset = bridge.stageDataset(
+  Buffer.from("Sample payload"),
+  "user-bucket",
+  "data/records.json"
+);
+
+const oracle = new TextileOracle(oracleWallet);
+const attestation = await bridge.requestAttestation(oracle, dataset);
+
+const registrationCalldata = bridge.encodeRegisterDataset(dataset, "metadata-uri");
+const attestationCalldata = bridge.encodeVerifyAndAnchorAttestation(attestation);
+```
+
+## License
+
+MIT

bridges/evm-storage-bridge/package.json

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+{
+  "name": "@textile/evm-storage-bridge",
+  "version": "1.0.0",
+  "description": "Decentralized Identity and Storage Bridge connecting EVM Blockchains with Textile Hub, Buckets, and Filecoin",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "test": "tsc && node --test dist/test/bridge.test.js"
+  },
+  "keywords": [
+    "textile",
+    "ethereum",
+    "evm",
+    "filecoin",
+    "ipfs",
+    "bridge",
+    "decentralized-identity",
+    "oracle"
+  ],
+  "author": "Textile Community",
+  "license": "MIT",
+  "dependencies": {
+    "ethers": "^5.7.2"
+  },
+  "devDependencies": {
+    "@types/node": "^18.19.0",
+    "typescript": "^4.9.5"
+  }
+}

bridges/evm-storage-bridge/src/bridge.ts

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+import * as crypto from "crypto";
+import { utils, Wallet } from "ethers";
+import {
+  AttestationProof,
+  BridgeConfig,
+  BridgedIdentity,
+  PinnedDataset,
+  StorageDealMetadata,
+} from "./types";
+import {
+  createIdentityChallenge,
+  deriveTextileIdentityFromEvmSignature,
+} from "./identity";
+import { TextileOracle } from "./oracle";
+
+/**
+ * Human-readable ABI for the TextileStorageBridge smart contract.
+ */
+export const TEXTILE_STORAGE_BRIDGE_ABI = [
+  "constructor(address initialOracle)",
+  "function owner() view returns (address)",
+  "function oracle() view returns (address)",
+  "function setOracle(address newOracle)",
+  "function transferOwnership(address newOwner)",
+  "function registerDataset(string cid, string bucketKey, uint256 sizeBytes, string metadataUri)",
+  "function anchorFilecoinDeal(string cid, uint64 dealId, string miner, uint64 durationBlocks)",
+  "function verifyAndAnchorAttestation(bytes32 dataHash, string cid, uint256 timestamp, uint256 nonce, bytes signature)",
+  "function registerIdentity(string textilePublicKey)",
+  "function getDataset(string cid) view returns (tuple(string bucketKey, uint256 sizeBytes, string metadataUri, address owner, uint256 registeredAt))",
+  "function getFilecoinDeal(string cid) view returns (tuple(uint64 dealId, string miner, uint64 durationBlocks, uint256 anchoredAt))",
+  "function getIdentity(address user) view returns (tuple(string textilePublicKey, uint256 registeredAt))",
+  "function isAttestationProcessed(bytes32 dataHash, string cid, uint256 nonce) view returns (bool)",
+  "event DatasetRegistered(string indexed cidKey, string cid, address indexed owner, string bucketKey, uint256 sizeBytes)",
+  "event FilecoinDealAnchored(string indexed cidKey, string cid, uint64 dealId, string miner, uint64 durationBlocks)",
+  "event AttestationVerified(bytes32 indexed dataHash, string cid, uint256 timestamp, uint256 nonce)",
+  "event IdentityRegistered(address indexed user, string textilePublicKey)",
+  "event OracleUpdated(address indexed previousOracle, address indexed newOracle)",
+  "event OwnershipTransferred(address indexed previousOwner, address indexed newOwner)",
+];
+
+/**
+ * Main coordinator orchestrating EVM blockchain interactions with Textile Hub Buckets and Filecoin.
+ */
+export class TextileEvmBridge {
+  private config: BridgeConfig;
+  private contractInterface: utils.Interface;
+
+  /**
+   * Initializes the TextileEvmBridge instance.
+   *
+   * @param config Bridge configuration containing contract and network parameters.
+   */
+  public constructor(config: BridgeConfig) {
+    this.config = config;
+    this.contractInterface = new utils.Interface(TEXTILE_STORAGE_BRIDGE_ABI);
+  }
+
+  /**
+   * Returns current bridge configuration.
+   *
+   * @returns BridgeConfig object.
+   */
+  public getConfig(): BridgeConfig {
+    return { ...this.config };
+  }
+
+  /**
+   * Authenticates an EVM wallet to deterministically generate a Textile Ed25519 identity.
+   *
+   * @param wallet Ethers Wallet or signer instance.
+   * @param customNonce Optional nonce string for the challenge.
+   * @returns Generated BridgedIdentity ready for Textile Hub API authentication.
+   */
+  public async authenticateWallet(
+    wallet: Wallet,
+    customNonce?: string
+  ): Promise<BridgedIdentity> {
+    const nonce = customNonce ?? crypto.randomBytes(16).toString("hex");
+    const challenge = createIdentityChallenge(wallet.address, nonce);
+    const signature = await wallet.signMessage(challenge);
+    return deriveTextileIdentityFromEvmSignature(wallet.address, signature, challenge);
+  }
+
+  /**
+   * Computes a standard SHA-256 multihash CID string for a binary dataset.
+   *
+   * @param data Binary payload array.
+   * @returns Canonical CID string.
+   */
+  public static computeCid(data: Uint8Array): string {
+    const hash = crypto.createHash("sha256").update(data).digest();
+    const multihash = Buffer.concat([Buffer.from([0x12, 0x20]), hash]);
+    return `bafk${multihash.toString("hex")}`;
+  }
+
+  /**
+   * Computes keccak256 hash of a binary payload.
+   *
+   * @param data Binary payload array.
+   * @returns Hex-encoded 32-byte hash string with 0x prefix.
+   */
+  public static computeDataHash(data: Uint8Array): string {
+    return utils.keccak256(data);
+  }
+
+  /**
+   * Prepares and stages a local dataset for Textile Buckets storage.
+   *
+   * @param data Binary content of the dataset.
+   * @param bucketKey Target bucket identifier.
+   * @param path Target path within the bucket.
+   * @returns Fully formed PinnedDataset object.
+   */
+  public stageDataset(data: Uint8Array, bucketKey: string, path: string): PinnedDataset {
+    const cid = TextileEvmBridge.computeCid(data);
+    const dataHash = TextileEvmBridge.computeDataHash(data);
+    return {
+      bucketKey,
+      path,
+      cid,
+      dataHash,
+      sizeBytes: data.byteLength,
+      pinnedAt: Math.floor(Date.now() / 1000),
+    };
+  }
+
+  /**
+   * Generates a cryptographic attestation proof through the authorized oracle service.
+   *
+   * @param oracle Active TextileOracle service.
+   * @param dataset Staged PinnedDataset.
+   * @returns AttestationProof certified by the oracle.
+   */
+  public async requestAttestation(
+    oracle: TextileOracle,
+    dataset: PinnedDataset
+  ): Promise<AttestationProof> {
+    return oracle.createAttestation(dataset.dataHash, dataset.cid, dataset.pinnedAt);
+  }
+
+  /**
+   * Encodes contract calldata for registerDataset function.
+   *
+   * @param dataset Pinned dataset metadata.
+   * @param metadataUri Supplementary metadata URI.
+   * @returns Hex-encoded calldata string.
+   */
+  public encodeRegisterDataset(dataset: PinnedDataset, metadataUri: string): string {
+    return this.contractInterface.encodeFunctionData("registerDataset", [
+      dataset.cid,
+      dataset.bucketKey,
+      dataset.sizeBytes,
+      metadataUri,
+    ]);
+  }
+
+  /**
+   * Encodes contract calldata for anchorFilecoinDeal function.
+   *
+   * @param deal Filecoin storage deal metadata.
+   * @returns Hex-encoded calldata string.
+   */
+  public encodeAnchorFilecoinDeal(deal: StorageDealMetadata): string {
+    return this.contractInterface.encodeFunctionData("anchorFilecoinDeal", [
+      deal.cid,
+      deal.dealId,
+      deal.miner,
+      deal.durationBlocks,
+    ]);
+  }
+
+  /**
+   * Encodes contract calldata for verifyAndAnchorAttestation function.
+   *
+   * @param proof Cryptographic attestation proof.
+   * @returns Hex-encoded calldata string.
+   */
+  public encodeVerifyAndAnchorAttestation(proof: AttestationProof): string {
+    return this.contractInterface.encodeFunctionData("verifyAndAnchorAttestation", [
+      proof.dataHash,
+      proof.cid,
+      proof.timestamp,
+      proof.nonce,
+      proof.signature,
+    ]);
+  }
+
+  /**
+   * Encodes contract calldata for registerIdentity function.
+   *
+   * @param textilePublicKey Hexadecimal string of derived Ed25519 public key.
+   * @returns Hex-encoded calldata string.
+   */
+  public encodeRegisterIdentity(textilePublicKey: string): string {
+    return this.contractInterface.encodeFunctionData("registerIdentity", [textilePublicKey]);
+  }
+}