bin/dao: remove schema.rs

bin/dao/daod/src/schema.rs

@@ -1,1343 +0,0 @@
-use std::{
-    any::{Any, TypeId},
-    collections::HashMap,
-    hash::Hasher,
-    io,
-    time::Instant,
-};
-
-use darkfi_serial::Encodable;
-use incrementalmerkletree::Tree;
-use log::debug;
-use pasta_curves::{
-    arithmetic::CurveAffine,
-    group::{
-        ff::{Field, PrimeField},
-        Curve, Group,
-    },
-    pallas,
-};
-use rand::rngs::OsRng;
-
-use darkfi::{
-    crypto::{
-        keypair::{Keypair, PublicKey, SecretKey},
-        proof::{ProvingKey, VerifyingKey},
-        schnorr::{SchnorrPublic, SchnorrSecret, Signature},
-        types::{DrkCircuitField, DrkSpendHook, DrkUserData, DrkValue},
-        util::{pedersen_commitment_u64, poseidon_hash},
-        Proof,
-    },
-    zk::{
-        circuit::{BurnContract, MintContract},
-        vm::ZkCircuit,
-        vm_stack::empty_witnesses,
-    },
-    zkas::decoder::ZkBinary,
-};
-
-use crate::contract::{dao_contract, example_contract, money_contract};
-
-// TODO: Anonymity leaks in this proof of concept:
-//
-// * Vote updates are linked to the proposal_bulla
-// * Nullifier of vote will link vote with the coin when it's spent
-
-// TODO: strategize and cleanup Result/Error usage
-// TODO: fix up code doc
-
-type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
-
-#[derive(Eq, PartialEq)]
-pub struct HashableBase(pub pallas::Base);
-
-// FIXME: TODO: This should need Hash, use something else like a b58 string.
-impl std::hash::Hash for HashableBase {
-    fn hash<H: Hasher>(&self, state: &mut H) {
-        let bytes = self.0.to_repr();
-        bytes.hash(state);
-    }
-}
-
-pub struct ZkBinaryContractInfo {
-    pub k_param: u32,
-    pub bincode: ZkBinary,
-    pub proving_key: ProvingKey,
-    pub verifying_key: VerifyingKey,
-}
-pub struct ZkNativeContractInfo {
-    pub proving_key: ProvingKey,
-    pub verifying_key: VerifyingKey,
-}
-
-pub enum ZkContractInfo {
-    Binary(ZkBinaryContractInfo),
-    Native(ZkNativeContractInfo),
-}
-
-pub struct ZkContractTable {
-    // Key will be a hash of zk binary contract on chain
-    table: HashMap<String, ZkContractInfo>,
-}
-
-impl ZkContractTable {
-    fn new() -> Self {
-        Self { table: HashMap::new() }
-    }
-
-    fn add_contract(&mut self, key: String, bincode: ZkBinary, k_param: u32) {
-        let witnesses = empty_witnesses(&bincode);
-        let circuit = ZkCircuit::new(witnesses, bincode.clone());
-        let proving_key = ProvingKey::build(k_param, &circuit);
-        let verifying_key = VerifyingKey::build(k_param, &circuit);
-        let info = ZkContractInfo::Binary(ZkBinaryContractInfo {
-            k_param,
-            bincode,
-            proving_key,
-            verifying_key,
-        });
-        self.table.insert(key, info);
-    }
-
-    fn add_native(&mut self, key: String, proving_key: ProvingKey, verifying_key: VerifyingKey) {
-        self.table.insert(
-            key,
-            ZkContractInfo::Native(ZkNativeContractInfo { proving_key, verifying_key }),
-        );
-    }
-
-    pub fn lookup(&self, key: &String) -> Option<&ZkContractInfo> {
-        self.table.get(key)
-    }
-}
-
-// ANCHOR: transaction
-pub struct Transaction {
-    pub func_calls: Vec<FuncCall>,
-    // TODO: this is wrong. It should be Vec<Vec<Signature>>
-    // each Vec<Signature> correspond to ONE function call
-    pub signatures: Vec<Signature>,
-}
-// ANCHOR_END: transaction
-
-impl Transaction {
-    /// Verify ZK contracts for the entire tx
-    /// In real code, we could parallelize this for loop
-    /// TODO: fix use of unwrap with Result type stuff
-    fn zk_verify(&self, zk_bins: &ZkContractTable) {
-        for func_call in &self.func_calls {
-            let proofs_public_vals = &func_call.call_data.zk_public_values();
-
-            assert_eq!(
-                proofs_public_vals.len(),
-                func_call.proofs.len(),
-                "proof_public_vals.len()={} and func_call.proofs.len()={} do not match",
-                proofs_public_vals.len(),
-                func_call.proofs.len()
-            );
-            for (i, (proof, (key, public_vals))) in
-                func_call.proofs.iter().zip(proofs_public_vals.iter()).enumerate()
-            {
-                match zk_bins.lookup(key).unwrap() {
-                    ZkContractInfo::Binary(info) => {
-                        let verifying_key = &info.verifying_key;
-                        let verify_result = proof.verify(verifying_key, public_vals);
-                        assert!(verify_result.is_ok(), "verify proof[{}]='{}' failed", i, key);
-                    }
-                    ZkContractInfo::Native(info) => {
-                        let verifying_key = &info.verifying_key;
-                        let verify_result = proof.verify(verifying_key, public_vals);
-                        assert!(verify_result.is_ok(), "verify proof[{}]='{}' failed", i, key);
-                    }
-                };
-                debug!(target: "demo", "zk_verify({}) passed [i={}]", key, i);
-            }
-        }
-    }
-
-    fn verify_sigs(&self) {
-        let mut unsigned_tx_data = vec![];
-        for (i, (func_call, signature)) in
-            self.func_calls.iter().zip(self.signatures.clone()).enumerate()
-        {
-            func_call.encode(&mut unsigned_tx_data).expect("failed to encode data");
-            let signature_pub_keys = func_call.call_data.signature_public_keys();
-            // TODO: Wrong must be fixed
-            for signature_pub_key in signature_pub_keys {
-                let verify_result = signature_pub_key.verify(&unsigned_tx_data[..], &signature);
-                assert!(verify_result, "verify sigs[{}] failed", i);
-            }
-            debug!(target: "demo", "verify_sigs({}) passed", i);
-        }
-    }
-}
-
-fn sign(signature_secrets: &[SecretKey], func_calls: &[FuncCall]) -> Vec<Signature> {
-    let mut signatures = vec![];
-    let mut unsigned_tx_data = vec![];
-    for (_i, (signature_secret, func_call)) in
-        signature_secrets.iter().zip(func_calls.iter()).enumerate()
-    {
-        func_call.encode(&mut unsigned_tx_data).expect("failed to encode data");
-        let signature = signature_secret.sign(&unsigned_tx_data[..]);
-        signatures.push(signature);
-    }
-    signatures
-}
-
-type ContractId = pallas::Base;
-type FuncId = pallas::Base;
-
-// ANCHOR: funccall
-pub struct FuncCall {
-    pub contract_id: ContractId,
-    pub func_id: FuncId,
-    pub call_data: Box<dyn CallDataBase>,
-    pub proofs: Vec<Proof>,
-}
-// ANCHOR_END: funccall
-
-impl Encodable for FuncCall {
-    fn encode<W: io::Write>(&self, mut w: W) -> core::result::Result<usize, io::Error> {
-        let mut len = 0;
-        len += self.contract_id.encode(&mut w)?;
-        len += self.func_id.encode(&mut w)?;
-        len += self.proofs.encode(&mut w)?;
-        len += self.call_data.encode_bytes(&mut w)?;
-        Ok(len)
-    }
-}
-
-// ANCHOR: calldatabase_trait
-pub trait CallDataBase {
-    // Public values for verifying the proofs
-    // Needed so we can convert internal types so they can be used in Proof::verify()
-    fn zk_public_values(&self) -> Vec<(String, Vec<DrkCircuitField>)>;
-
-    // For upcasting to CallData itself so it can be read in state_transition()
-    fn as_any(&self) -> &dyn Any;
-
-    // Public keys we will use to verify transaction signatures.
-    fn signature_public_keys(&self) -> Vec<PublicKey>;
-
-    fn encode_bytes(
-        &self,
-        writer: &mut dyn std::io::Write,
-    ) -> core::result::Result<usize, std::io::Error>;
-}
-// ANCHOR_END: calldatabase_trait
-
-type GenericContractState = Box<dyn Any>;
-
-pub struct StateRegistry {
-    pub states: HashMap<HashableBase, GenericContractState>,
-}
-
-impl StateRegistry {
-    fn new() -> Self {
-        Self { states: HashMap::new() }
-    }
-
-    fn register(&mut self, contract_id: ContractId, state: GenericContractState) {
-        debug!(target: "StateRegistry::register()", "contract_id: {:?}", contract_id);
-        self.states.insert(HashableBase(contract_id), state);
-    }
-
-    //pub fn lookup_mut<'a, S: 'static>(&'a mut self, contract_id: ContractId) -> Option<&'a mut S> {
-    pub fn lookup_mut<S: 'static>(&mut self, contract_id: ContractId) -> Option<&mut S> {
-        self.states.get_mut(&HashableBase(contract_id)).and_then(|state| state.downcast_mut())
-    }
-
-    //pub fn lookup<'a, S: 'static>(&'a self, contract_id: ContractId) -> Option<&'a S> {
-    pub fn lookup<S: 'static>(&self, contract_id: ContractId) -> Option<&S> {
-        self.states.get(&HashableBase(contract_id)).and_then(|state| state.downcast_ref())
-    }
-}
-
-pub trait UpdateBase {
-    fn apply(self: Box<Self>, states: &mut StateRegistry);
-}
-
-///////////////////////////////////////////////////
-///// Example contract
-///////////////////////////////////////////////////
-pub async fn example() -> Result<()> {
-    debug!(target: "demo", "Stage 0. Example contract");
-    // Lookup table for smart contract states
-    let mut states = StateRegistry::new();
-
-    // Initialize ZK binary table
-    let mut zk_bins = ZkContractTable::new();
-
-    let zk_example_foo_bincode = include_bytes!("../proof/foo.zk.bin");
-    let zk_example_foo_bin = ZkBinary::decode(zk_example_foo_bincode)?;
-    zk_bins.add_contract("example-foo".to_string(), zk_example_foo_bin, 13);
-
-    let example_state = example_contract::state::State::new();
-    states.register(*example_contract::CONTRACT_ID, example_state);
-
-    //// Wallet
-
-    let foo_w = example_contract::foo::wallet::Foo { a: 5, b: 10 };
-    let signature_secret = SecretKey::random(&mut OsRng);
-
-    let builder = example_contract::foo::wallet::Builder { foo: foo_w, signature_secret };
-    let func_call = builder.build(&zk_bins);
-    let func_calls = vec![func_call];
-
-    let signatures = sign(&[signature_secret], &func_calls);
-    let tx = Transaction { func_calls, signatures };
-
-    //// Validator
-
-    let mut updates = vec![];
-    // Validate all function calls in the tx
-    for (idx, func_call) in tx.func_calls.iter().enumerate() {
-        if func_call.func_id == *example_contract::foo::FUNC_ID {
-            debug!("example_contract::foo::state_transition()");
-
-            let update = example_contract::foo::validate::state_transition(&states, idx, &tx)
-                .expect("example_contract::foo::validate::state_transition() failed!");
-            updates.push(update);
-        }
-    }
-
-    // Atomically apply all changes
-    for update in updates {
-        update.apply(&mut states);
-    }
-
-    tx.zk_verify(&zk_bins);
-    tx.verify_sigs();
-
-    Ok(())
-}
-
-pub async fn demo() -> Result<()> {
-    // Example smart contract
-    //// TODO: this will be moved to a different file
-    example().await?;
-
-    // Money parameters
-    let xdrk_supply = 1_000_000;
-    let xdrk_token_id = pallas::Base::random(&mut OsRng);
-
-    // Governance token parameters
-    let gdrk_supply = 1_000_000;
-    let gdrk_token_id = pallas::Base::random(&mut OsRng);
-
-    // DAO parameters
-    let dao_proposer_limit = 110;
-    let dao_quorum = 110;
-    let dao_approval_ratio_quot = 1;
-    let dao_approval_ratio_base = 2;
-
-    // Lookup table for smart contract states
-    let mut states = StateRegistry::new();
-
-    // Initialize ZK binary table
-    let mut zk_bins = ZkContractTable::new();
-
-    debug!(target: "demo", "Loading dao-mint.zk");
-    let zk_dao_mint_bincode = include_bytes!("../proof/dao-mint.zk.bin");
-    let zk_dao_mint_bin = ZkBinary::decode(zk_dao_mint_bincode)?;
-    zk_bins.add_contract("dao-mint".to_string(), zk_dao_mint_bin, 13);
-
-    debug!(target: "demo", "Loading money-transfer contracts");
-    {
-        let start = Instant::now();
-        let mint_pk = ProvingKey::build(11, &MintContract::default());
-        debug!("Mint PK: [{:?}]", start.elapsed());
-        let start = Instant::now();
-        let burn_pk = ProvingKey::build(11, &BurnContract::default());
-        debug!("Burn PK: [{:?}]", start.elapsed());
-        let start = Instant::now();
-        let mint_vk = VerifyingKey::build(11, &MintContract::default());
-        debug!("Mint VK: [{:?}]", start.elapsed());
-        let start = Instant::now();
-        let burn_vk = VerifyingKey::build(11, &BurnContract::default());
-        debug!("Burn VK: [{:?}]", start.elapsed());
-
-        zk_bins.add_native("money-transfer-mint".to_string(), mint_pk, mint_vk);
-        zk_bins.add_native("money-transfer-burn".to_string(), burn_pk, burn_vk);
-    }
-    debug!(target: "demo", "Loading dao-propose-main.zk");
-    let zk_dao_propose_main_bincode = include_bytes!("../proof/dao-propose-main.zk.bin");
-    let zk_dao_propose_main_bin = ZkBinary::decode(zk_dao_propose_main_bincode)?;
-    zk_bins.add_contract("dao-propose-main".to_string(), zk_dao_propose_main_bin, 13);
-    debug!(target: "demo", "Loading dao-propose-burn.zk");
-    let zk_dao_propose_burn_bincode = include_bytes!("../proof/dao-propose-burn.zk.bin");
-    let zk_dao_propose_burn_bin = ZkBinary::decode(zk_dao_propose_burn_bincode)?;
-    zk_bins.add_contract("dao-propose-burn".to_string(), zk_dao_propose_burn_bin, 13);
-    debug!(target: "demo", "Loading dao-vote-main.zk");
-    let zk_dao_vote_main_bincode = include_bytes!("../proof/dao-vote-main.zk.bin");
-    let zk_dao_vote_main_bin = ZkBinary::decode(zk_dao_vote_main_bincode)?;
-    zk_bins.add_contract("dao-vote-main".to_string(), zk_dao_vote_main_bin, 13);
-    debug!(target: "demo", "Loading dao-vote-burn.zk");
-    let zk_dao_vote_burn_bincode = include_bytes!("../proof/dao-vote-burn.zk.bin");
-    let zk_dao_vote_burn_bin = ZkBinary::decode(zk_dao_vote_burn_bincode)?;
-    zk_bins.add_contract("dao-vote-burn".to_string(), zk_dao_vote_burn_bin, 13);
-    let zk_dao_exec_bincode = include_bytes!("../proof/dao-exec.zk.bin");
-    let zk_dao_exec_bin = ZkBinary::decode(zk_dao_exec_bincode)?;
-    zk_bins.add_contract("dao-exec".to_string(), zk_dao_exec_bin, 13);
-
-    // State for money contracts
-    let cashier_signature_secret = SecretKey::random(&mut OsRng);
-    let cashier_signature_public = PublicKey::from_secret(cashier_signature_secret);
-    let faucet_signature_secret = SecretKey::random(&mut OsRng);
-    let faucet_signature_public = PublicKey::from_secret(faucet_signature_secret);
-
-    ///////////////////////////////////////////////////
-
-    let money_state =
-        money_contract::state::State::new(cashier_signature_public, faucet_signature_public);
-    states.register(*money_contract::CONTRACT_ID, money_state);
-
-    /////////////////////////////////////////////////////
-
-    let dao_state = dao_contract::State::new();
-    states.register(*dao_contract::CONTRACT_ID, dao_state);
-
-    /////////////////////////////////////////////////////
-    ////// Create the DAO bulla
-    /////////////////////////////////////////////////////
-    debug!(target: "demo", "Stage 1. Creating DAO bulla");
-
-    //// Wallet
-
-    //// Setup the DAO
-    let dao_keypair = Keypair::random(&mut OsRng);
-    let dao_bulla_blind = pallas::Base::random(&mut OsRng);
-
-    let signature_secret = SecretKey::random(&mut OsRng);
-    // Create DAO mint tx
-    let builder = dao_contract::mint::wallet::Builder {
-        dao_proposer_limit,
-        dao_quorum,
-        dao_approval_ratio_quot,
-        dao_approval_ratio_base,
-        gov_token_id: gdrk_token_id,
-        dao_pubkey: dao_keypair.public,
-        dao_bulla_blind,
-        _signature_secret: signature_secret,
-    };
-    let func_call = builder.build(&zk_bins);
-    let func_calls = vec![func_call];
-
-    let signatures = sign(&[signature_secret], &func_calls);
-    let tx = Transaction { func_calls, signatures };
-
-    //// Validator
-
-    let mut updates = vec![];
-    // Validate all function calls in the tx
-    for (idx, func_call) in tx.func_calls.iter().enumerate() {
-        // So then the verifier will lookup the corresponding state_transition and apply
-        // functions based off the func_id
-        if func_call.func_id == *dao_contract::mint::FUNC_ID {
-            debug!("dao_contract::mint::state_transition()");
-
-            let update = dao_contract::mint::validate::state_transition(&states, idx, &tx)
-                .expect("dao_contract::mint::validate::state_transition() failed!");
-            updates.push(update);
-        }
-    }
-
-    // Atomically apply all changes
-    for update in updates {
-        update.apply(&mut states);
-    }
-
-    tx.zk_verify(&zk_bins);
-    tx.verify_sigs();
-
-    // Wallet stuff
-
-    // In your wallet, wait until you see the tx confirmed before doing anything below
-    // So for example keep track of tx hash
-    //assert_eq!(tx.hash(), tx_hash);
-
-    // We need to witness() the value in our local merkle tree
-    // Must be called as soon as this DAO bulla is added to the state
-    let dao_leaf_position = {
-        let state = states.lookup_mut::<dao_contract::State>(*dao_contract::CONTRACT_ID).unwrap();
-        state.dao_tree.witness().unwrap()
-    };
-
-    // It might just be easier to hash it ourselves from keypair and blind...
-    let dao_bulla = {
-        assert_eq!(tx.func_calls.len(), 1);
-        let func_call = &tx.func_calls[0];
-        let call_data = func_call.call_data.as_any();
-        assert_eq!((*call_data).type_id(), TypeId::of::<dao_contract::mint::validate::CallData>());
-        let call_data = call_data.downcast_ref::<dao_contract::mint::validate::CallData>().unwrap();
-        call_data.dao_bulla.clone()
-    };
-    debug!(target: "demo", "Create DAO bulla: {:?}", dao_bulla.0);
-
-    ///////////////////////////////////////////////////
-    //// Mint the initial supply of treasury token
-    //// and send it all to the DAO directly
-    ///////////////////////////////////////////////////
-    debug!(target: "demo", "Stage 2. Minting treasury token");
-
-    let state = states.lookup_mut::<money_contract::State>(*money_contract::CONTRACT_ID).unwrap();
-    state.wallet_cache.track(dao_keypair.secret);
-
-    //// Wallet
-
-    // Address of deployed contract in our example is dao_contract::exec::FUNC_ID
-    // This field is public, you can see it's being sent to a DAO
-    // but nothing else is visible.
-    //
-    // In the python code we wrote:
-    //
-    //   spend_hook = b"0xdao_ruleset"
-    //
-    let spend_hook = *dao_contract::exec::FUNC_ID;
-    // The user_data can be a simple hash of the items passed into the ZK proof
-    // up to corresponding linked ZK proof to interpret however they need.
-    // In out case, it's the bulla for the DAO
-    let user_data = dao_bulla.0;
-
-    let builder = money_contract::transfer::wallet::Builder {
-        clear_inputs: vec![money_contract::transfer::wallet::BuilderClearInputInfo {
-            value: xdrk_supply,
-            token_id: xdrk_token_id,
-            signature_secret: cashier_signature_secret,
-        }],
-        inputs: vec![],
-        outputs: vec![money_contract::transfer::wallet::BuilderOutputInfo {
-            value: xdrk_supply,
-            token_id: xdrk_token_id,
-            public: dao_keypair.public,
-            serial: pallas::Base::random(&mut OsRng),
-            coin_blind: pallas::Base::random(&mut OsRng),
-            spend_hook,
-            user_data,
-        }],
-    };
-
-    let func_call = builder.build(&zk_bins)?;
-    let func_calls = vec![func_call];
-
-    let signatures = sign(&[cashier_signature_secret], &func_calls);
-    let tx = Transaction { func_calls, signatures };
-
-    //// Validator
-
-    let mut updates = vec![];
-    // Validate all function calls in the tx
-    for (idx, func_call) in tx.func_calls.iter().enumerate() {
-        // So then the verifier will lookup the corresponding state_transition and apply
-        // functions based off the func_id
-        if func_call.func_id == *money_contract::transfer::FUNC_ID {
-            debug!("money_contract::transfer::state_transition()");
-
-            let update = money_contract::transfer::validate::state_transition(&states, idx, &tx)
-                .expect("money_contract::transfer::validate::state_transition() failed!");
-            updates.push(update);
-        }
-    }
-
-    // Atomically apply all changes
-    for update in updates {
-        update.apply(&mut states);
-    }
-
-    tx.zk_verify(&zk_bins);
-    tx.verify_sigs();
-
-    //// Wallet
-    // DAO reads the money received from the encrypted note
-
-    let state = states.lookup_mut::<money_contract::State>(*money_contract::CONTRACT_ID).unwrap();
-    let mut recv_coins = state.wallet_cache.get_received(&dao_keypair.secret);
-    assert_eq!(recv_coins.len(), 1);
-    let dao_recv_coin = recv_coins.pop().unwrap();
-    let treasury_note = dao_recv_coin.note;
-
-    // Check the actual coin received is valid before accepting it
-
-    let coords = dao_keypair.public.0.to_affine().coordinates().unwrap();
-    let coin = poseidon_hash::<8>([
-        *coords.x(),
-        *coords.y(),
-        DrkValue::from(treasury_note.value),
-        treasury_note.token_id,
-        treasury_note.serial,
-        treasury_note.spend_hook,
-        treasury_note.user_data,
-        treasury_note.coin_blind,
-    ]);
-    assert_eq!(coin, dao_recv_coin.coin.0);
-
-    assert_eq!(treasury_note.spend_hook, *dao_contract::exec::FUNC_ID);
-    assert_eq!(treasury_note.user_data, dao_bulla.0);
-
-    debug!("DAO received a coin worth {} xDRK", treasury_note.value);
-
-    ///////////////////////////////////////////////////
-    //// Mint the governance token
-    //// Send it to three hodlers
-    ///////////////////////////////////////////////////
-    debug!(target: "demo", "Stage 3. Minting governance token");
-
-    //// Wallet
-
-    // Hodler 1
-    let gov_keypair_1 = Keypair::random(&mut OsRng);
-    // Hodler 2
-    let gov_keypair_2 = Keypair::random(&mut OsRng);
-    // Hodler 3: the tiebreaker
-    let gov_keypair_3 = Keypair::random(&mut OsRng);
-
-    let state = states.lookup_mut::<money_contract::State>(*money_contract::CONTRACT_ID).unwrap();
-    state.wallet_cache.track(gov_keypair_1.secret);
-    state.wallet_cache.track(gov_keypair_2.secret);
-    state.wallet_cache.track(gov_keypair_3.secret);
-
-    let gov_keypairs = vec![gov_keypair_1, gov_keypair_2, gov_keypair_3];
-
-    // Spend hook and user data disabled
-    let spend_hook = DrkSpendHook::from(0);
-    let user_data = DrkUserData::from(0);
-
-    let output1 = money_contract::transfer::wallet::BuilderOutputInfo {
-        value: 400000,
-        token_id: gdrk_token_id,
-        public: gov_keypair_1.public,
-        serial: pallas::Base::random(&mut OsRng),
-        coin_blind: pallas::Base::random(&mut OsRng),
-        spend_hook,
-        user_data,
-    };
-
-    let output2 = money_contract::transfer::wallet::BuilderOutputInfo {
-        value: 400000,
-        token_id: gdrk_token_id,
-        public: gov_keypair_2.public,
-        serial: pallas::Base::random(&mut OsRng),
-        coin_blind: pallas::Base::random(&mut OsRng),
-        spend_hook,
-        user_data,
-    };
-
-    let output3 = money_contract::transfer::wallet::BuilderOutputInfo {
-        value: 200000,
-        token_id: gdrk_token_id,
-        public: gov_keypair_3.public,
-        serial: pallas::Base::random(&mut OsRng),
-        coin_blind: pallas::Base::random(&mut OsRng),
-        spend_hook,
-        user_data,
-    };
-
-    assert!(2 * 400000 + 200000 == gdrk_supply);
-
-    let builder = money_contract::transfer::wallet::Builder {
-        clear_inputs: vec![money_contract::transfer::wallet::BuilderClearInputInfo {
-            value: gdrk_supply,
-            token_id: gdrk_token_id,
-            signature_secret: cashier_signature_secret,
-        }],
-        inputs: vec![],
-        outputs: vec![output1, output2, output3],
-    };
-
-    let func_call = builder.build(&zk_bins)?;
-    let func_calls = vec![func_call];
-
-    let signatures = sign(&[cashier_signature_secret], &func_calls);
-    let tx = Transaction { func_calls, signatures };
-
-    //// Validator
-
-    let mut updates = vec![];
-    // Validate all function calls in the tx
-    for (idx, func_call) in tx.func_calls.iter().enumerate() {
-        // So then the verifier will lookup the corresponding state_transition and apply
-        // functions based off the func_id
-        if func_call.func_id == *money_contract::transfer::FUNC_ID {
-            debug!("money_contract::transfer::state_transition()");
-
-            let update = money_contract::transfer::validate::state_transition(&states, idx, &tx)
-                .expect("money_contract::transfer::validate::state_transition() failed!");
-            updates.push(update);
-        }
-    }
-
-    // Atomically apply all changes
-    for update in updates {
-        update.apply(&mut states);
-    }
-
-    tx.zk_verify(&zk_bins);
-    tx.verify_sigs();
-
-    //// Wallet
-
-    let mut gov_recv = vec![None, None, None];
-    // Check that each person received one coin
-    for (i, key) in gov_keypairs.iter().enumerate() {
-        let gov_recv_coin = {
-            let state =
-                states.lookup_mut::<money_contract::State>(*money_contract::CONTRACT_ID).unwrap();
-            let mut recv_coins = state.wallet_cache.get_received(&key.secret);
-            assert_eq!(recv_coins.len(), 1);
-            let recv_coin = recv_coins.pop().unwrap();
-            let note = &recv_coin.note;
-
-            assert_eq!(note.token_id, gdrk_token_id);
-            // Normal payment
-            assert_eq!(note.spend_hook, pallas::Base::from(0));
-            assert_eq!(note.user_data, pallas::Base::from(0));
-
-            let coords = key.public.0.to_affine().coordinates().unwrap();
-            let coin = poseidon_hash::<8>([
-                *coords.x(),
-                *coords.y(),
-                DrkValue::from(note.value),
-                note.token_id,
-                note.serial,
-                note.spend_hook,
-                note.user_data,
-                note.coin_blind,
-            ]);
-            assert_eq!(coin, recv_coin.coin.0);
-
-            debug!("Holder{} received a coin worth {} gDRK", i, note.value);
-
-            recv_coin
-        };
-        gov_recv[i] = Some(gov_recv_coin);
-    }
-    // unwrap them for this demo
-    let gov_recv: Vec<_> = gov_recv.into_iter().map(|r| r.unwrap()).collect();
-
-    ///////////////////////////////////////////////////
-    // DAO rules:
-    // 1. gov token IDs must match on all inputs
-    // 2. proposals must be submitted by minimum amount
-    // 3. all votes >= quorum
-    // 4. outcome > approval_ratio
-    // 5. structure of outputs
-    //   output 0: value and address
-    //   output 1: change address
-    ///////////////////////////////////////////////////
-
-    ///////////////////////////////////////////////////
-    // Propose the vote
-    // In order to make a valid vote, first the proposer must
-    // meet a criteria for a minimum number of gov tokens
-    ///////////////////////////////////////////////////
-    debug!(target: "demo", "Stage 4. Propose the vote");
-
-    //// Wallet
-
-    // TODO: look into proposal expiry once time for voting has finished
-
-    let user_keypair = Keypair::random(&mut OsRng);
-
-    let (money_leaf_position, money_merkle_path) = {
-        let state = states.lookup::<money_contract::State>(*money_contract::CONTRACT_ID).unwrap();
-        let tree = &state.tree;
-        let leaf_position = gov_recv[0].leaf_position;
-        let root = tree.root(0).unwrap();
-        let merkle_path = tree.authentication_path(leaf_position, &root).unwrap();
-        (leaf_position, merkle_path)
-    };
-
-    // TODO: is it possible for an invalid transfer() to be constructed on exec()?
-    //       need to look into this
-    let signature_secret = SecretKey::random(&mut OsRng);
-    let input = dao_contract::propose::wallet::BuilderInput {
-        secret: gov_keypair_1.secret,
-        note: gov_recv[0].note.clone(),
-        leaf_position: money_leaf_position,
-        merkle_path: money_merkle_path,
-        signature_secret,
-    };
-
-    let (dao_merkle_path, dao_merkle_root) = {
-        let state = states.lookup::<dao_contract::State>(*dao_contract::CONTRACT_ID).unwrap();
-        let tree = &state.dao_tree;
-        let root = tree.root(0).unwrap();
-        let merkle_path = tree.authentication_path(dao_leaf_position, &root).unwrap();
-        (merkle_path, root)
-    };
-
-    let dao_params = dao_contract::mint::wallet::DaoParams {
-        proposer_limit: dao_proposer_limit,
-        quorum: dao_quorum,
-        approval_ratio_base: dao_approval_ratio_base,
-        approval_ratio_quot: dao_approval_ratio_quot,
-        gov_token_id: gdrk_token_id,
-        public_key: dao_keypair.public,
-        bulla_blind: dao_bulla_blind,
-    };
-
-    let proposal = dao_contract::propose::wallet::Proposal {
-        dest: user_keypair.public,
-        amount: 1000,
-        serial: pallas::Base::random(&mut OsRng),
-        token_id: xdrk_token_id,
-        blind: pallas::Base::random(&mut OsRng),
-    };
-
-    let builder = dao_contract::propose::wallet::Builder {
-        inputs: vec![input],
-        proposal,
-        dao: dao_params.clone(),
-        dao_leaf_position,
-        dao_merkle_path,
-        dao_merkle_root,
-    };
-
-    let func_call = builder.build(&zk_bins);
-    let func_calls = vec![func_call];
-
-    let signatures = sign(&[signature_secret], &func_calls);
-    let tx = Transaction { func_calls, signatures };
-
-    //// Validator
-
-    let mut updates = vec![];
-    // Validate all function calls in the tx
-    for (idx, func_call) in tx.func_calls.iter().enumerate() {
-        if func_call.func_id == *dao_contract::propose::FUNC_ID {
-            debug!(target: "demo", "dao_contract::propose::state_transition()");
-
-            let update = dao_contract::propose::validate::state_transition(&states, idx, &tx)
-                .expect("dao_contract::propose::validate::state_transition() failed!");
-            updates.push(update);
-        }
-    }
-
-    // Atomically apply all changes
-    for update in updates {
-        update.apply(&mut states);
-    }
-
-    tx.zk_verify(&zk_bins);
-    tx.verify_sigs();
-
-    //// Wallet
-
-    // Read received proposal
-    let (proposal, proposal_bulla) = {
-        assert_eq!(tx.func_calls.len(), 1);
-        let func_call = &tx.func_calls[0];
-        let call_data = func_call.call_data.as_any();
-        assert_eq!(
-            (*call_data).type_id(),
-            TypeId::of::<dao_contract::propose::validate::CallData>()
-        );
-        let call_data =
-            call_data.downcast_ref::<dao_contract::propose::validate::CallData>().unwrap();
-
-        let header = &call_data.header;
-        let note: dao_contract::propose::wallet::Note =
-            header.enc_note.decrypt(&dao_keypair.secret).unwrap();
-
-        // TODO: check it belongs to DAO bulla
-
-        // Return the proposal info
-        (note.proposal, call_data.header.proposal_bulla)
-    };
-    debug!(target: "demo", "Proposal now active!");
-    debug!(target: "demo", "  destination: {:?}", proposal.dest);
-    debug!(target: "demo", "  amount: {}", proposal.amount);
-    debug!(target: "demo", "  token_id: {:?}", proposal.token_id);
-    debug!(target: "demo", "  dao_bulla: {:?}", dao_bulla.0);
-    debug!(target: "demo", "Proposal bulla: {:?}", proposal_bulla);
-
-    ///////////////////////////////////////////////////
-    // Proposal is accepted!
-    // Start the voting
-    ///////////////////////////////////////////////////
-
-    // Copying these schizo comments from python code:
-    // Lets the voting begin
-    // Voters have access to the proposal and dao data
-    //   vote_state = VoteState()
-    // We don't need to copy nullifier set because it is checked from gov_state
-    // in vote_state_transition() anyway
-    //
-    // TODO: what happens if voters don't unblind their vote
-    // Answer:
-    //   1. there is a time limit
-    //   2. both the MPC or users can unblind
-    //
-    // TODO: bug if I vote then send money, then we can double vote
-    // TODO: all timestamps missing
-    //       - timelock (future voting starts in 2 days)
-    // Fix: use nullifiers from money gov state only from
-    // beginning of gov period
-    // Cannot use nullifiers from before voting period
-
-    debug!(target: "demo", "Stage 5. Start voting");
-
-    // We were previously saving updates here for testing
-    // let mut updates = vec![];
-
-    // User 1: YES
-
-    let (money_leaf_position, money_merkle_path) = {
-        let state = states.lookup::<money_contract::State>(*money_contract::CONTRACT_ID).unwrap();
-        let tree = &state.tree;
-        let leaf_position = gov_recv[0].leaf_position;
-        let root = tree.root(0).unwrap();
-        let merkle_path = tree.authentication_path(leaf_position, &root).unwrap();
-        (leaf_position, merkle_path)
-    };
-
-    let signature_secret = SecretKey::random(&mut OsRng);
-    let input = dao_contract::vote::wallet::BuilderInput {
-        secret: gov_keypair_1.secret,
-        note: gov_recv[0].note.clone(),
-        leaf_position: money_leaf_position,
-        merkle_path: money_merkle_path,
-        signature_secret,
-    };
-
-    let vote_option: bool = true;
-    // assert!(vote_option || !vote_option); // wtf
-
-    // We create a new keypair to encrypt the vote.
-    // For the demo MVP, you can just use the dao_keypair secret
-    let vote_keypair_1 = Keypair::random(&mut OsRng);
-
-    let builder = dao_contract::vote::wallet::Builder {
-        inputs: vec![input],
-        vote: dao_contract::vote::wallet::Vote {
-            vote_option,
-            vote_option_blind: pallas::Scalar::random(&mut OsRng),
-        },
-        vote_keypair: vote_keypair_1,
-        proposal: proposal.clone(),
-        dao: dao_params.clone(),
-    };
-    debug!(target: "demo", "build()...");
-    let func_call = builder.build(&zk_bins);
-    let func_calls = vec![func_call];
-
-    let signatures = sign(&[signature_secret], &func_calls);
-    let tx = Transaction { func_calls, signatures };
-
-    //// Validator
-
-    let mut updates = vec![];
-    // Validate all function calls in the tx
-    for (idx, func_call) in tx.func_calls.iter().enumerate() {
-        if func_call.func_id == *dao_contract::vote::FUNC_ID {
-            debug!(target: "demo", "dao_contract::vote::state_transition()");
-
-            let update = dao_contract::vote::validate::state_transition(&states, idx, &tx)
-                .expect("dao_contract::vote::validate::state_transition() failed!");
-            updates.push(update);
-        }
-    }
-
-    // Atomically apply all changes
-    for update in updates {
-        update.apply(&mut states);
-    }
-
-    tx.zk_verify(&zk_bins);
-    tx.verify_sigs();
-
-    //// Wallet
-
-    // Secret vote info. Needs to be revealed at some point.
-    // TODO: look into verifiable encryption for notes
-    // TODO: look into timelock puzzle as a possibility
-    let vote_note_1 = {
-        assert_eq!(tx.func_calls.len(), 1);
-        let func_call = &tx.func_calls[0];
-        let call_data = func_call.call_data.as_any();
-        assert_eq!((*call_data).type_id(), TypeId::of::<dao_contract::vote::validate::CallData>());
-        let call_data = call_data.downcast_ref::<dao_contract::vote::validate::CallData>().unwrap();
-
-        let header = &call_data.header;
-        let note: dao_contract::vote::wallet::Note =
-            header.enc_note.decrypt(&vote_keypair_1.secret).unwrap();
-        note
-    };
-    debug!(target: "demo", "User 1 voted!");
-    debug!(target: "demo", "  vote_option: {}", vote_note_1.vote.vote_option);
-    debug!(target: "demo", "  value: {}", vote_note_1.vote_value);
-
-    // User 2: NO
-
-    let (money_leaf_position, money_merkle_path) = {
-        let state = states.lookup::<money_contract::State>(*money_contract::CONTRACT_ID).unwrap();
-        let tree = &state.tree;
-        let leaf_position = gov_recv[1].leaf_position;
-        let root = tree.root(0).unwrap();
-        let merkle_path = tree.authentication_path(leaf_position, &root).unwrap();
-        (leaf_position, merkle_path)
-    };
-
-    let signature_secret = SecretKey::random(&mut OsRng);
-    let input = dao_contract::vote::wallet::BuilderInput {
-        secret: gov_keypair_2.secret,
-        note: gov_recv[1].note.clone(),
-        leaf_position: money_leaf_position,
-        merkle_path: money_merkle_path,
-        signature_secret,
-    };
-
-    let vote_option: bool = false;
-    // assert!(vote_option || !vote_option); // wtf
-
-    // We create a new keypair to encrypt the vote.
-    let vote_keypair_2 = Keypair::random(&mut OsRng);
-
-    let builder = dao_contract::vote::wallet::Builder {
-        inputs: vec![input],
-        vote: dao_contract::vote::wallet::Vote {
-            vote_option,
-            vote_option_blind: pallas::Scalar::random(&mut OsRng),
-        },
-        vote_keypair: vote_keypair_2,
-        proposal: proposal.clone(),
-        dao: dao_params.clone(),
-    };
-    debug!(target: "demo", "build()...");
-    let func_call = builder.build(&zk_bins);
-    let func_calls = vec![func_call];
-
-    let signatures = sign(&[signature_secret], &func_calls);
-    let tx = Transaction { func_calls, signatures };
-
-    //// Validator
-
-    let mut updates = vec![];
-    // Validate all function calls in the tx
-    for (idx, func_call) in tx.func_calls.iter().enumerate() {
-        if func_call.func_id == *dao_contract::vote::FUNC_ID {
-            debug!(target: "demo", "dao_contract::vote::state_transition()");
-
-            let update = dao_contract::vote::validate::state_transition(&states, idx, &tx)
-                .expect("dao_contract::vote::validate::state_transition() failed!");
-            updates.push(update);
-        }
-    }
-
-    // Atomically apply all changes
-    for update in updates {
-        update.apply(&mut states);
-    }
-
-    tx.zk_verify(&zk_bins);
-    tx.verify_sigs();
-
-    //// Wallet
-
-    // Secret vote info. Needs to be revealed at some point.
-    // TODO: look into verifiable encryption for notes
-    // TODO: look into timelock puzzle as a possibility
-    let vote_note_2 = {
-        assert_eq!(tx.func_calls.len(), 1);
-        let func_call = &tx.func_calls[0];
-        let call_data = func_call.call_data.as_any();
-        assert_eq!((*call_data).type_id(), TypeId::of::<dao_contract::vote::validate::CallData>());
-        let call_data = call_data.downcast_ref::<dao_contract::vote::validate::CallData>().unwrap();
-
-        let header = &call_data.header;
-        let note: dao_contract::vote::wallet::Note =
-            header.enc_note.decrypt(&vote_keypair_2.secret).unwrap();
-        note
-    };
-    debug!(target: "demo", "User 2 voted!");
-    debug!(target: "demo", "  vote_option: {}", vote_note_2.vote.vote_option);
-    debug!(target: "demo", "  value: {}", vote_note_2.vote_value);
-
-    // User 3: YES
-
-    let (money_leaf_position, money_merkle_path) = {
-        let state = states.lookup::<money_contract::State>(*money_contract::CONTRACT_ID).unwrap();
-        let tree = &state.tree;
-        let leaf_position = gov_recv[2].leaf_position;
-        let root = tree.root(0).unwrap();
-        let merkle_path = tree.authentication_path(leaf_position, &root).unwrap();
-        (leaf_position, merkle_path)
-    };
-
-    let signature_secret = SecretKey::random(&mut OsRng);
-    let input = dao_contract::vote::wallet::BuilderInput {
-        secret: gov_keypair_3.secret,
-        note: gov_recv[2].note.clone(),
-        leaf_position: money_leaf_position,
-        merkle_path: money_merkle_path,
-        signature_secret,
-    };
-
-    let vote_option: bool = true;
-    // assert!(vote_option || !vote_option); // wtf
-
-    // We create a new keypair to encrypt the vote.
-    let vote_keypair_3 = Keypair::random(&mut OsRng);
-
-    let builder = dao_contract::vote::wallet::Builder {
-        inputs: vec![input],
-        vote: dao_contract::vote::wallet::Vote {
-            vote_option,
-            vote_option_blind: pallas::Scalar::random(&mut OsRng),
-        },
-        vote_keypair: vote_keypair_3,
-        proposal: proposal.clone(),
-        dao: dao_params.clone(),
-    };
-    debug!(target: "demo", "build()...");
-    let func_call = builder.build(&zk_bins);
-    let func_calls = vec![func_call];
-
-    let signatures = sign(&[signature_secret], &func_calls);
-    let tx = Transaction { func_calls, signatures };
-
-    //// Validator
-
-    let mut updates = vec![];
-    // Validate all function calls in the tx
-    for (idx, func_call) in tx.func_calls.iter().enumerate() {
-        if func_call.func_id == *dao_contract::vote::FUNC_ID {
-            debug!(target: "demo", "dao_contract::vote::state_transition()");
-
-            let update = dao_contract::vote::validate::state_transition(&states, idx, &tx)
-                .expect("dao_contract::vote::validate::state_transition() failed!");
-            updates.push(update);
-        }
-    }
-
-    // Atomically apply all changes
-    for update in updates {
-        update.apply(&mut states);
-    }
-
-    tx.zk_verify(&zk_bins);
-    tx.verify_sigs();
-
-    //// Wallet
-
-    // Secret vote info. Needs to be revealed at some point.
-    // TODO: look into verifiable encryption for notes
-    // TODO: look into timelock puzzle as a possibility
-    let vote_note_3 = {
-        assert_eq!(tx.func_calls.len(), 1);
-        let func_call = &tx.func_calls[0];
-        let call_data = func_call.call_data.as_any();
-        assert_eq!((*call_data).type_id(), TypeId::of::<dao_contract::vote::validate::CallData>());
-        let call_data = call_data.downcast_ref::<dao_contract::vote::validate::CallData>().unwrap();
-
-        let header = &call_data.header;
-        let note: dao_contract::vote::wallet::Note =
-            header.enc_note.decrypt(&vote_keypair_3.secret).unwrap();
-        note
-    };
-    debug!(target: "demo", "User 3 voted!");
-    debug!(target: "demo", "  vote_option: {}", vote_note_3.vote.vote_option);
-    debug!(target: "demo", "  value: {}", vote_note_3.vote_value);
-
-    // Every votes produces a semi-homomorphic encryption of their vote.
-    // Which is either yes or no
-    // We copy the state tree for the governance token so coins can be used
-    // to vote on other proposals at the same time.
-    // With their vote, they produce a ZK proof + nullifier
-    // The votes are unblinded by MPC to a selected party at the end of the
-    // voting period.
-    // (that's if we want votes to be hidden during voting)
-
-    let mut yes_votes_value = 0;
-    let mut yes_votes_blind = pallas::Scalar::from(0);
-    let mut yes_votes_commit = pallas::Point::identity();
-
-    let mut all_votes_value = 0;
-    let mut all_votes_blind = pallas::Scalar::from(0);
-    let mut all_votes_commit = pallas::Point::identity();
-
-    // We were previously saving votes to a Vec<Update> for testing.
-    // However since Update is now UpdateBase it gets moved into update.apply().
-    // So we need to think of another way to run these tests.
-    //assert!(updates.len() == 3);
-
-    for (i, note /* update*/) in [vote_note_1, vote_note_2, vote_note_3]
-        .iter() /*.zip(updates)*/
-        .enumerate()
-    {
-        let vote_commit = pedersen_commitment_u64(note.vote_value, note.vote_value_blind);
-        //assert!(update.value_commit == all_vote_value_commit);
-        all_votes_commit += vote_commit;
-        all_votes_blind += note.vote_value_blind;
-
-        let yes_vote_commit = pedersen_commitment_u64(
-            note.vote.vote_option as u64 * note.vote_value,
-            note.vote.vote_option_blind,
-        );
-        //assert!(update.yes_vote_commit == yes_vote_commit);
-
-        yes_votes_commit += yes_vote_commit;
-        yes_votes_blind += note.vote.vote_option_blind;
-
-        let vote_option = note.vote.vote_option;
-
-        if vote_option {
-            yes_votes_value += note.vote_value;
-        }
-        all_votes_value += note.vote_value;
-        let vote_result: String = if vote_option { "yes".to_string() } else { "no".to_string() };
-
-        debug!("Voter {} voted {}", i, vote_result);
-    }
-
-    debug!("Outcome = {} / {}", yes_votes_value, all_votes_value);
-
-    assert!(all_votes_commit == pedersen_commitment_u64(all_votes_value, all_votes_blind));
-    assert!(yes_votes_commit == pedersen_commitment_u64(yes_votes_value, yes_votes_blind));
-
-    ///////////////////////////////////////////////////
-    // Execute the vote
-    ///////////////////////////////////////////////////
-
-    //// Wallet
-
-    // Used to export user_data from this coin so it can be accessed by DAO::exec()
-    let user_data_blind = pallas::Base::random(&mut OsRng);
-
-    let user_serial = pallas::Base::random(&mut OsRng);
-    let user_coin_blind = pallas::Base::random(&mut OsRng);
-    let dao_serial = pallas::Base::random(&mut OsRng);
-    let dao_coin_blind = pallas::Base::random(&mut OsRng);
-    let input_value = treasury_note.value;
-    let input_value_blind = pallas::Scalar::random(&mut OsRng);
-    let tx_signature_secret = SecretKey::random(&mut OsRng);
-    let exec_signature_secret = SecretKey::random(&mut OsRng);
-
-    let (treasury_leaf_position, treasury_merkle_path) = {
-        let state = states.lookup::<money_contract::State>(*money_contract::CONTRACT_ID).unwrap();
-        let tree = &state.tree;
-        let leaf_position = dao_recv_coin.leaf_position;
-        let root = tree.root(0).unwrap();
-        let merkle_path = tree.authentication_path(leaf_position, &root).unwrap();
-        (leaf_position, merkle_path)
-    };
-
-    let input = money_contract::transfer::wallet::BuilderInputInfo {
-        leaf_position: treasury_leaf_position,
-        merkle_path: treasury_merkle_path,
-        secret: dao_keypair.secret,
-        note: treasury_note,
-        user_data_blind,
-        value_blind: input_value_blind,
-        signature_secret: tx_signature_secret,
-    };
-
-    let builder = money_contract::transfer::wallet::Builder {
-        clear_inputs: vec![],
-        inputs: vec![input],
-        outputs: vec![
-            // Sending money
-            money_contract::transfer::wallet::BuilderOutputInfo {
-                value: 1000,
-                token_id: xdrk_token_id,
-                public: user_keypair.public,
-                serial: proposal.serial,
-                coin_blind: proposal.blind,
-                spend_hook: pallas::Base::from(0),
-                user_data: pallas::Base::from(0),
-            },
-            // Change back to DAO
-            money_contract::transfer::wallet::BuilderOutputInfo {
-                value: xdrk_supply - 1000,
-                token_id: xdrk_token_id,
-                public: dao_keypair.public,
-                serial: dao_serial,
-                coin_blind: dao_coin_blind,
-                spend_hook: *dao_contract::exec::FUNC_ID,
-                // TODO: should be DAO bulla
-                user_data: proposal_bulla,
-            },
-        ],
-    };
-
-    let transfer_func_call = builder.build(&zk_bins)?;
-
-    let builder = dao_contract::exec::wallet::Builder {
-        proposal,
-        dao: dao_params,
-        yes_votes_value,
-        all_votes_value,
-        yes_votes_blind,
-        all_votes_blind,
-        user_serial,
-        user_coin_blind,
-        dao_serial,
-        dao_coin_blind,
-        input_value,
-        input_value_blind,
-        hook_dao_exec: *dao_contract::exec::FUNC_ID,
-        signature_secret: exec_signature_secret,
-    };
-    let exec_func_call = builder.build(&zk_bins);
-    let func_calls = vec![transfer_func_call, exec_func_call];
-
-    let signatures = sign(&[tx_signature_secret, exec_signature_secret], &func_calls);
-    let tx = Transaction { func_calls, signatures };
-
-    {
-        // Now the spend_hook field specifies the function DAO::exec()
-        // so Money::transfer() must also be combined with DAO::exec()
-
-        assert_eq!(tx.func_calls.len(), 2);
-        let transfer_func_call = &tx.func_calls[0];
-        let transfer_call_data = transfer_func_call.call_data.as_any();
-
-        assert_eq!(
-            (*transfer_call_data).type_id(),
-            TypeId::of::<money_contract::transfer::validate::CallData>()
-        );
-        let transfer_call_data =
-            transfer_call_data.downcast_ref::<money_contract::transfer::validate::CallData>();
-        let transfer_call_data = transfer_call_data.unwrap();
-        // At least one input has this field value which means DAO::exec() is invoked.
-        assert_eq!(transfer_call_data.inputs.len(), 1);
-        let input = &transfer_call_data.inputs[0];
-        assert_eq!(input.revealed.spend_hook, *dao_contract::exec::FUNC_ID);
-        let user_data_enc = poseidon_hash::<2>([dao_bulla.0, user_data_blind]);
-        assert_eq!(input.revealed.user_data_enc, user_data_enc);
-    }
-
-    //// Validator
-
-    let mut updates = vec![];
-    // Validate all function calls in the tx
-    for (idx, func_call) in tx.func_calls.iter().enumerate() {
-        if func_call.func_id == *dao_contract::exec::FUNC_ID {
-            debug!("dao_contract::exec::state_transition()");
-
-            let update = dao_contract::exec::validate::state_transition(&states, idx, &tx)
-                .expect("dao_contract::exec::validate::state_transition() failed!");
-            updates.push(update);
-        } else if func_call.func_id == *money_contract::transfer::FUNC_ID {
-            debug!("money_contract::transfer::state_transition()");
-
-            let update = money_contract::transfer::validate::state_transition(&states, idx, &tx)
-                .expect("money_contract::transfer::validate::state_transition() failed!");
-            updates.push(update);
-        }
-    }
-
-    // Atomically apply all changes
-    for update in updates {
-        update.apply(&mut states);
-    }
-
-    // Other stuff
-    tx.zk_verify(&zk_bins);
-    tx.verify_sigs();
-
-    //// Wallet
-
-    Ok(())
-}