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

[s6pa1rta3n-lab]

Overview

This pull request implements a complete Textile EVM Storage and Decentralized Identity Bridge, addressing and resolving #213.

The bridge enables interoperability between EVM networks (Ethereum, Polygon, Arbitrum, Base) and Textile distributed storage infrastructure (Textile Hub Buckets, ThreadDB, and Filecoin).

Payout Stipulations Checklist (#213)

• Create a Textile bridge to or solution for a popular blockchain or web3 community (Ethereum / EVM).
• Integrate Textile Hub APIs, Buckets, ThreadDB, and Filecoin storage deals.
• Implement deterministic Decentralized Identity (DID) derivation from standard EVM wallet signatures (EIP-191 / EIP-712).
• Deployable EVM smart contract (TextileStorageBridge.sol) anchoring CIDs, bucket records, and Filecoin deals on-chain.
• Cryptographic oracle attestation service validating off-chain persistence before on-chain execution.
• Zero mocked assertions: genuine cryptographic primitives (secp256k1, Ed25519, keccak256, sha256).
• Complete source code delivered in bridges/evm-storage-bridge/.
• Comprehensive documentation and tutorial guide delivered in docs/docs/tutorials/evm-storage-bridge.md.
• Navigation updated in docs/mkdocs.yml.

Implemented Components

1. DID and Key Derivation (src/identity.ts): Deterministic RFC 8410 Ed25519 key derivation from EVM wallet personal signatures via PBKDF2/SHA-256 and HMAC-SHA-512.
2. On-Chain Smart Contract (src/contracts/TextileStorageBridge.sol): Solidity registry recording dataset CIDs, metadata URIs, Filecoin deal IDs, and verifying cryptographic oracle attestations with anti-replay protection.
3. Cryptographic Oracle Service (src/oracle.ts): secp256k1 attestation generator certifying data hash and CID persistence.
4. Bridge Orchestrator (src/bridge.ts): High-level client coordinating wallet authentication, dataset staging, CID computation, and contract calldata encoding.
5. Comprehensive Test Suite (test/bridge.test.ts): 9 tests across 5 test suites validating cryptographic signing, verification, and end-to-end bridge workflows.
6. Documentation (docs/docs/tutorials/evm-storage-bridge.md): Complete guide including target market analysis, expected demand, audience reach plans, and testing instructions.

Verification

Executed test suite:

• Command: cd bridges/evm-storage-bridge && npm test
• Results: 9 passing tests, 0 failures.

Payout Routing

• EVM (Base/Arbitrum/Polygon/ETH): 0xF46C9F6d70C50BF81ef3588AB523a90a594a2F89
• Stellar: GCL6OXAMLD75BMTINA6EMRUDWK5THQUSHMYNLSNBCJAPZJHNYJTUNIBC