Breaking Wallet Connections with Zcash zk-SNARKs

import zcash  # Assume Zcash SDK wrapper
from hashlib import sha256

def blinded_intent(sk_w, v, i, rho):
    note = zcash.prf_note(sk_w, v, sha256(i.encode()).digest())
    cm = zcash.pedersen_commit(note, rho)
    nf = zcash.prf_nf(sk_w, rho)
    
    # zk-SNARK circuit: prove note opens to v, i valid, nf unique
    pi = zcash.generate_proof(
        circuit='shielded_intent', 
        witness={'sk_w': sk_w, 'v': v, 'i': i, 'rho': rho}
    )
    return cm, nf, pi

# Example usage for Pump.fun buy intent
intent = "buy_pumpfun_token:X:0.1_SOL"  # Serialized instruction
cm, nf, pi = blinded_intent(private_key, 0.1, intent, random_rho())
# Submit to Zcash: zcash.shield_transaction([ (cm, nf, pi) ], sender_addr)

def aggregate_proofs(proofs, bundle_params):
    valid_proofs = [pi for pi in proofs if zcash.verify(pi, public_params)]
    signals = [extract_signal(pi) for pi in valid_proofs]  # (cm, type, v)
    matched = group_by(signals, key=lambda s: s['type'])  # MPC-homomorphic
    
    if sum(s['v'] for s in matched[bundle_params['target']]) < bundle_params['min_vol']:
        raise ValueError("Insufficient volume")
    
    # Aggregate circuit: sum cm_j, range proof on total
    agg_pi = zcash.generate_proof(
        circuit='aggregate_bundle',
        witness={'signals': signals, 'target': bundle_params['target']}
    )
    return agg_pi

use anchor_lang::prelude::*;
use ark_groth16::{prepare_verifying_key, verify_proof};

#[program]
pub mod zkbundle_verifier {
    use super::*;

    pub fn execute_bundle(
        ctx: Context<ExecuteBundle>, 
        agg_proof: Vec<u8>, 
        bundle_ix: Vec<u8>
    ) -> Result<()> {
        let vk = prepare_verifying_key(&VERIFYING_KEY);  // Zcash-derived
        let proof = parse_proof(&agg_proof);  // Groth16 proof
        let public_input = parse_public_signals(&bundle_ix);

        require!(
            verify_proof(&vk, &proof, &public_input).is_ok(), 
            ErrorCode::InvalidProof
        );

        // CPI to Pump.fun
        let pump_program = ctx.accounts.pump_fun.key();
        anchor_lang::system_program::invoke(
            &bundle_ix, 
            &ctx.accounts.to_accounts
        )?;  // Atomic exec

        Ok(())
    }
}