X-RAY

seed = SHA256(signature + hashedUserId + walletIndex)
shadowKeypair = Keypair.fromSeed(seed)

#[account]
pub struct Post {
    pub author: Pubkey,      // Shadow wallet (untraceable)
    pub target: String,      // Target profile URL
    pub content: String,     // Post content
    pub bid: u64,            // Boost amount in lamports
    pub timestamp: i64,      // Unix timestamp
    pub bump: u8,            // PDA bump
}

import { Keypair } from "@solana/web3.js";
import { createHash } from "crypto";

function sha256(data: string): Buffer {
  return createHash("sha256").update(data).digest();
}

function deriveSeed(signature: string, hashedUserId: string, walletIndex: number): Uint8Array {
  const derived = sha256(signature + ":" + hashedUserId + ":" + walletIndex);
  return new Uint8Array(derived);
}

function generateShadowWallet(signature: string, hashedUserId: string, walletIndex: number): Keypair {
  const derivedSeed = deriveSeed(signature, hashedUserId, walletIndex);
  return Keypair.fromSeed(derivedSeed);
}

// 1. Fund shadow wallet anonymously via ZK mixer
await privacyCash.deposit(amount, publicWallet);
await privacyCash.withdraw(shadowWallet.publicKey);

// 2. Create anonymous post on-chain
await program.methods
  .createPost(target, content, boostAmount)
  .accounts({
    author: shadowWallet.publicKey,  // Untraceable
    post: postPDA,
    systemProgram: SystemProgram.programId,
  })
  .signers([shadowWallet])
  .rpc();