Provncloud SDK (Rust)

Universal, no-std Rust SDK for privacy-preserving digital signatures and data anchoring.

Provncloud SDK allows you to cryptographically sign data and anchor it to blockchain networks (like Arweave AO and Solana) without revealing the raw content. It strictly adheres to JCS (RFC 8785) for canonical JSON serialization, ensuring signatures verified in Rust can be validated across any other supported language.

🚀 Installation

Add to your Cargo.toml:

[dependencies]

provn-sdk = "0.3.0"

For no_std environments (e.g., Solana programs):

[dependencies]

provn-sdk = { version = "0.3.0", default-features = false, features = ["alloc"] }

💻 Usage

use provn_sdk::{Claim, sign_claim, verify_claim, generate_keypair};

fn main() {
    // 1. Generate a new Ed25519 keypair
    let key = generate_keypair();

    // 2. Create a claim with the data you want to anchor
    let claim = Claim::new("AI Model Accuracy: 99.2%".to_string());

    // 3. Sign the claim
    let signed = sign_claim(&claim, &key).expect("Signing failed");

    // 4. Verify the claim (Offline)
    let is_valid = verify_claim(&signed).expect("Verification failed");
    println!("Signature valid: {}", is_valid);
}

🛠 Features

Standard Compliance: Uses JCS (RFC 8785) for deterministic JSON serialization.
no-std Support: Fully compatible with embedded and blockchain runtimes.
Cross-Language: Signatures are interoperable with Provn SDKs in Python, JS/TS, Go, and Java.
Safety: Robust validation of payload sizes (2KB limit) and timestamp bounds.

📚 Resources

⚖️ License