Allow more than one attestation event per CFD

We can now pass more than one set of `nonce_pks` when creating a CFD.
Each set corresponds to (and is identified by) a different oracle
event, allowing us to construct CFDs which can be settled via oracle
attestation at more than one point in time.

We also remember the CET-event relationship in `CfdTransactions`. This
is needed so that we can select the correct CET when the oracle
attests to the outcome of an event. Additionally, we save the
`nonce_pks` to more easily verify the adaptor signatures.

cfd_protocol/src/lib.rs

@@ -5,8 +5,8 @@ pub mod interval;
 
 pub use protocol::{
     close_transaction, commit_descriptor, compute_adaptor_pk, create_cfd_transactions,
-    finalize_spend_transaction, lock_descriptor, punish_transaction, renew_cfd_transactions,
-    spending_tx_sighash, CfdTransactions, PartyParams, Payout, PunishParams, TransactionExt,
-    WalletExt,
+    finalize_spend_transaction, generate_payouts, lock_descriptor, punish_transaction,
+    renew_cfd_transactions, spending_tx_sighash, Announcement, Cets, CfdTransactions, PartyParams,
+    Payout, PunishParams, TransactionExt, WalletExt,
 };
 pub use secp256k1_zkp;

cfd_protocol/src/protocol.rs

@@ -21,6 +21,7 @@ use bdk::FeeRate;
 use itertools::Itertools;
 use secp256k1_zkp::{self, schnorrsig, EcdsaAdaptorSignature, SecretKey, Signature, SECP256K1};
 use std::collections::HashMap;
+use std::hash::Hasher;
 use std::iter::FromIterator;
 use std::num::NonZeroU8;
 use std::ops::RangeInclusive;
@@ -72,19 +73,19 @@ where
 /// * `taker` - The initial parameters of the taker.
 /// * `taker_punish_params` - The punish parameters of the taker.
 /// * `oracle_pk` - The public key of the oracle.
-/// * `nonce_pks` - One R-value per price digit signed by the oracle. Their order matches a big
-///   endian encoding of the price.
+/// * `cet_timelock` - Relative timelock of the CET transaction with respect to the commit
+///   transaction.
 /// * `refund_timelock` - Relative timelock of the refund transaction with respect to the commit
 ///   transaction.
-/// * `payouts` - All the possible ways in which the contract can be settled, according to the
-///   conditions of the bet.
+/// * `payouts_per_event` - All the possible ways in which the contract can be settled, according to
+///   the conditions of the bet. The key is the event at which the oracle will attest the price.
 /// * `identity_sk` - The secret key of the caller, used to sign and encsign different transactions.
 pub fn create_cfd_transactions(
     (maker, maker_punish_params): (PartyParams, PunishParams),
     (taker, taker_punish_params): (PartyParams, PunishParams),
-    (oracle_pk, nonce_pks): (schnorrsig::PublicKey, &[schnorrsig::PublicKey]),
+    oracle_pk: schnorrsig::PublicKey,
     (cet_timelock, refund_timelock): (u32, u32),
-    payouts: Vec<Payout>,
+    payouts_per_event: HashMap<Announcement, Vec<Payout>>,
     identity_sk: SecretKey,
 ) -> Result<CfdTransactions> {
     let lock_tx = lock_transaction(
@@ -109,9 +110,9 @@ pub fn create_cfd_transactions(
             taker.address,
             taker_punish_params,
         ),
-        (oracle_pk, nonce_pks),
+        oracle_pk,
         (cet_timelock, refund_timelock),
-        payouts,
+        payouts_per_event,
         identity_sk,
     )
 }
@@ -130,9 +131,9 @@ pub fn renew_cfd_transactions(
         Address,
         PunishParams,
     ),
-    (oracle_pk, nonce_pks): (schnorrsig::PublicKey, &[schnorrsig::PublicKey]),
+    oracle_pk: schnorrsig::PublicKey,
     (cet_timelock, refund_timelock): (u32, u32),
-    payouts: Vec<Payout>,
+    payouts_per_event: HashMap<Announcement, Vec<Payout>>,
     identity_sk: SecretKey,
 ) -> Result<CfdTransactions> {
     build_cfds(
@@ -149,9 +150,9 @@ pub fn renew_cfd_transactions(
             taker_address,
             taker_punish_params,
         ),
-        (oracle_pk, nonce_pks),
+        oracle_pk,
         (cet_timelock, refund_timelock),
-        payouts,
+        payouts_per_event,
         identity_sk,
     )
 }
@@ -170,9 +171,9 @@ fn build_cfds(
         Address,
         PunishParams,
     ),
-    (oracle_pk, nonce_pks): (schnorrsig::PublicKey, &[schnorrsig::PublicKey]),
+    oracle_pk: schnorrsig::PublicKey,
     (cet_timelock, refund_timelock): (u32, u32),
-    payouts: Vec<Payout>,
+    payouts_per_event: HashMap<Announcement, Vec<Payout>>,
     identity_sk: SecretKey,
 ) -> Result<CfdTransactions> {
     let commit_tx = CommitTransaction::new(
@@ -215,24 +216,31 @@ fn build_cfds(
         (tx.into_inner(), sig)
     };
 
-    let cets = payouts
-        .into_iter()
-        .map(|payout| {
-            let cet = ContractExecutionTx::new(
-                &commit_tx,
-                payout.clone(),
-                &maker_address,
-                &taker_address,
-                nonce_pks,
-                cet_timelock,
-            )?;
-
-            let encsig = cet.encsign(identity_sk, &oracle_pk)?;
-
-            Ok((cet.into_inner(), encsig, payout.digits))
-        })
-        .collect::<Result<Vec<_>>>()
-        .context("cannot build and sign all cets")?;
+    let mut cets = vec![];
+    for (event, payouts) in payouts_per_event.iter() {
+        let cets_tmp = payouts
+            .iter()
+            .map(|payout| {
+                let cet = ContractExecutionTx::new(
+                    &commit_tx,
+                    payout.clone(),
+                    &maker_address,
+                    &taker_address,
+                    event.nonce_pks.as_slice(),
+                    cet_timelock,
+                )?;
+
+                let encsig = cet.encsign(identity_sk, &oracle_pk)?;
+
+                Ok((cet.into_inner(), encsig, payout.digits.clone()))
+            })
+            .collect::<Result<Vec<_>>>()
+            .context("cannot build and sign all cets")?;
+        cets.push(Cets {
+            event: event.clone(),
+            cets: cets_tmp,
+        });
+    }
 
     Ok(CfdTransactions {
         lock: lock_tx,
@@ -341,10 +349,42 @@ pub struct PunishParams {
 pub struct CfdTransactions {
     pub lock: PartiallySignedTransaction,
     pub commit: (Transaction, EcdsaAdaptorSignature),
-    pub cets: Vec<(Transaction, EcdsaAdaptorSignature, interval::Digits)>,
+    pub cets: Vec<Cets>,
     pub refund: (Transaction, Signature),
 }
 
+/// Group of CETs associated with a particular oracle announcement.
+///
+/// All of the adaptor signatures included will be _possibly_ unlocked
+/// by the attestation corresponding to the announcement. In practice,
+/// only one of the adaptor signatures should be unlocked if the
+/// payout intervals are constructed correctly. To check if an adaptor
+/// signature can be unlocked by a price attestation, verify whether
+/// the price attested to lies within its interval.
+#[derive(Debug, Clone)]
+pub struct Cets {
+    pub event: Announcement,
+    pub cets: Vec<(Transaction, EcdsaAdaptorSignature, interval::Digits)>,
+}
+
+#[derive(Debug, Clone, Eq)]
+pub struct Announcement {
+    pub id: String,
+    pub nonce_pks: Vec<schnorrsig::PublicKey>,
+}
+
+impl std::hash::Hash for Announcement {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.id.hash(state)
+    }
+}
+
+impl PartialEq for Announcement {
+    fn eq(&self, other: &Self) -> bool {
+        self.id.eq(&other.id)
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct Payout {
     digits: interval::Digits,
@@ -352,23 +392,23 @@ pub struct Payout {
     taker_amount: Amount,
 }
 
-impl Payout {
-    pub fn new(
-        range: RangeInclusive<u64>,
-        maker_amount: Amount,
-        taker_amount: Amount,
-    ) -> Result<Vec<Self>> {
-        let digits = interval::Digits::new(range).context("invalid interval")?;
-        Ok(digits
-            .into_iter()
-            .map(|digits| Self {
-                digits,
-                maker_amount,
-                taker_amount,
-            })
-            .collect())
-    }
+pub fn generate_payouts(
+    range: RangeInclusive<u64>,
+    maker_amount: Amount,
+    taker_amount: Amount,
+) -> Result<Vec<Payout>> {
+    let digits = interval::Digits::new(range).context("invalid interval")?;
+    Ok(digits
+        .into_iter()
+        .map(|digits| Payout {
+            digits,
+            maker_amount,
+            taker_amount,
+        })
+        .collect())
+}
 
+impl Payout {
     fn into_txouts(self, maker_address: &Address, taker_address: &Address) -> Vec<TxOut> {
         let txouts = [
             (self.maker_amount, maker_address),
@@ -464,7 +504,7 @@ mod tests {
 
         let orig_maker_amount = 1000;
         let orig_taker_amount = 1000;
-        let payouts = Payout::new(
+        let payouts = generate_payouts(
             0..=10_000,
             Amount::from_sat(orig_maker_amount),
             Amount::from_sat(orig_taker_amount),
@@ -498,7 +538,7 @@ mod tests {
 
         let orig_maker_amount = dummy_dust_limit.as_sat() - 1;
         let orig_taker_amount = 1000;
-        let payouts = Payout::new(
+        let payouts = generate_payouts(
             0..=10_000,
             Amount::from_sat(orig_maker_amount),
             Amount::from_sat(orig_taker_amount),

cfd_protocol/tests/cfds.rs

@@ -8,12 +8,14 @@ use bdk::SignOptions;
 use bitcoin::util::psbt::PartiallySignedTransaction;
 use cfd_protocol::{
     close_transaction, commit_descriptor, compute_adaptor_pk, create_cfd_transactions,
-    finalize_spend_transaction, interval, lock_descriptor, punish_transaction,
-    renew_cfd_transactions, spending_tx_sighash, CfdTransactions, Payout, PunishParams,
-    TransactionExt, WalletExt,
+    finalize_spend_transaction, generate_payouts, interval, lock_descriptor, punish_transaction,
+    renew_cfd_transactions, spending_tx_sighash, Announcement, Cets, CfdTransactions, Payout,
+    PunishParams, TransactionExt, WalletExt,
 };
 use rand::{thread_rng, CryptoRng, RngCore};
 use secp256k1_zkp::{schnorrsig, EcdsaAdaptorSignature, SecretKey, Signature, SECP256K1};
+use std::collections::HashMap;
+use std::iter::FromIterator;
 use std::str::FromStr;
 
 #[test]
@@ -26,25 +28,38 @@ fn create_cfd() {
     let maker_wallet = build_wallet(&mut rng, Amount::from_btc(0.4).unwrap(), 5).unwrap();
     let taker_wallet = build_wallet(&mut rng, Amount::from_btc(0.4).unwrap(), 5).unwrap();
 
-    let oracle_data = OliviaData::example();
-    let oracle_pk = oracle_data.pk;
-    let nonce_pks = oracle_data.nonce_pks.clone();
+    let oracle_data_0 = OliviaData::example_0();
+    let oracle_data_1 = OliviaData::example_1();
 
-    let payouts = vec![
-        Payout::new(
-            0..=40_000,
-            Amount::from_btc(1.5).unwrap(),
-            Amount::from_btc(0.5).unwrap(),
-        )
-        .unwrap(),
-        Payout::new(
-            40_001..=70_000,
-            Amount::ZERO,
-            Amount::from_btc(2.0).unwrap(),
-        )
-        .unwrap(),
-    ]
-    .concat();
+    let oracle_pk = oracle_data_0.pk;
+
+    let event_0 = oracle_data_0.announcement();
+    let event_1 = oracle_data_1.announcement();
+
+    let payouts_per_event = HashMap::from_iter([
+        (
+            event_0.clone(),
+            generate_payouts(0..=50_000, Amount::ZERO, Amount::from_btc(2.0).unwrap()).unwrap(),
+        ),
+        (
+            event_1.clone(),
+            [
+                generate_payouts(
+                    40_001..=70_000,
+                    Amount::from_btc(0.5).unwrap(),
+                    Amount::from_btc(1.5).unwrap(),
+                )
+                .unwrap(),
+                generate_payouts(
+                    70_001..=100_000,
+                    Amount::from_btc(1.5).unwrap(),
+                    Amount::from_btc(0.5).unwrap(),
+                )
+                .unwrap(),
+            ]
+            .concat(),
+        ),
+    ]);
 
     let cet_timelock = 0;
     let refund_timelock = 0;
@@ -53,11 +68,16 @@ fn create_cfd() {
         &mut rng,
         (&maker_wallet, maker_lock_amount),
         (&taker_wallet, taker_lock_amount),
-        (oracle_pk, &nonce_pks),
-        payouts,
+        oracle_pk,
+        payouts_per_event,
         (cet_timelock, refund_timelock),
     );
 
+    assert_contains_cets_for_event(&maker_cfd_txs.cets, &event_0);
+    assert_contains_cets_for_event(&maker_cfd_txs.cets, &event_1);
+    assert_contains_cets_for_event(&taker_cfd_txs.cets, &event_0);
+    assert_contains_cets_for_event(&taker_cfd_txs.cets, &event_1);
+
     let lock_desc = lock_descriptor(maker.pk, taker.pk);
     let lock_amount = maker_lock_amount + taker_lock_amount;
 
@@ -70,7 +90,7 @@ fn create_cfd() {
     verify_cfd_sigs(
         (&maker_cfd_txs, maker.pk, maker.pub_pk),
         (&taker_cfd_txs, taker.pk, taker.pub_pk),
-        (oracle_pk, &nonce_pks),
+        (oracle_pk, vec![event_0, event_1]),
         (&lock_desc, lock_amount),
         (&commit_desc, commit_amount),
     );
@@ -96,7 +116,7 @@ fn create_cfd() {
             taker.rev_sk,
             taker_addr,
         ),
-        oracle_data,
+        &[oracle_data_0, oracle_data_1],
         (lock_desc, lock_amount),
         (commit_desc, commit_amount),
     );
@@ -112,20 +132,23 @@ fn renew_cfd() {
     let maker_wallet = build_wallet(&mut rng, Amount::from_btc(0.4).unwrap(), 5).unwrap();
     let taker_wallet = build_wallet(&mut rng, Amount::from_btc(0.4).unwrap(), 5).unwrap();
 
-    let oracle_data = OliviaData::example();
+    let oracle_data = OliviaData::example_0();
     let oracle_pk = oracle_data.pk;
-    let nonce_pks = oracle_data.nonce_pks.clone();
-
-    let payouts = vec![
-        Payout::new(0..=10_000, Amount::from_btc(2.0).unwrap(), Amount::ZERO).unwrap(),
-        Payout::new(
-            10_001..=50_000,
-            Amount::ZERO,
-            Amount::from_btc(2.0).unwrap(),
-        )
-        .unwrap(),
-    ]
-    .concat();
+    let event = oracle_data.announcement();
+
+    let payouts_per_event = HashMap::from_iter([(
+        event,
+        vec![
+            generate_payouts(0..=10_000, Amount::from_btc(2.0).unwrap(), Amount::ZERO).unwrap(),
+            generate_payouts(
+                10_001..=50_000,
+                Amount::ZERO,
+                Amount::from_btc(2.0).unwrap(),
+            )
+            .unwrap(),
+        ]
+        .concat(),
+    )]);
 
     let cet_timelock = 0;
     let refund_timelock = 0;
@@ -134,8 +157,8 @@ fn renew_cfd() {
         &mut rng,
         (&maker_wallet, maker_lock_amount),
         (&taker_wallet, taker_lock_amount),
-        (oracle_pk, &nonce_pks),
-        payouts,
+        oracle_pk,
+        payouts_per_event,
         (cet_timelock, refund_timelock),
     );
 
@@ -147,21 +170,28 @@ fn renew_cfd() {
     let (taker_rev_sk, taker_rev_pk) = make_keypair(&mut rng);
     let (taker_pub_sk, taker_pub_pk) = make_keypair(&mut rng);
 
-    let payouts = vec![
-        Payout::new(
-            0..=50_000,
-            Amount::from_btc(1.5).unwrap(),
-            Amount::from_btc(0.5).unwrap(),
-        )
-        .unwrap(),
-        Payout::new(
-            50_001..=70_000,
-            Amount::from_btc(0.5).unwrap(),
-            Amount::from_btc(1.5).unwrap(),
-        )
-        .unwrap(),
-    ]
-    .concat();
+    let oracle_data = OliviaData::example_1();
+    let oracle_pk = oracle_data.pk;
+    let event = oracle_data.announcement();
+
+    let payouts_per_event = HashMap::from_iter([(
+        event.clone(),
+        vec![
+            generate_payouts(
+                0..=50_000,
+                Amount::from_btc(1.5).unwrap(),
+                Amount::from_btc(0.5).unwrap(),
+            )
+            .unwrap(),
+            generate_payouts(
+                50_001..=70_000,
+                Amount::from_btc(0.5).unwrap(),
+                Amount::from_btc(1.5).unwrap(),
+            )
+            .unwrap(),
+        ]
+        .concat(),
+    )]);
 
     let maker_cfd_txs = renew_cfd_transactions(
         maker_cfd_txs.lock,
@@ -183,9 +213,9 @@ fn renew_cfd() {
                 publish_pk: taker_pub_pk,
             },
         ),
-        (oracle_pk, &nonce_pks),
+        oracle_pk,
         (cet_timelock, refund_timelock),
-        payouts.clone(),
+        payouts_per_event.clone(),
         maker.sk,
     )
     .unwrap();
@@ -210,13 +240,16 @@ fn renew_cfd() {
                 publish_pk: taker_pub_pk,
             },
         ),
-        (oracle_pk, &nonce_pks),
+        oracle_pk,
         (cet_timelock, refund_timelock),
-        payouts,
+        payouts_per_event,
         taker.sk,
     )
     .unwrap();
 
+    assert_contains_cets_for_event(&maker_cfd_txs.cets, &event);
+    assert_contains_cets_for_event(&taker_cfd_txs.cets, &event);
+
     let lock_desc = lock_descriptor(maker.pk, taker.pk);
     let lock_amount = maker_lock_amount + taker_lock_amount;
 
@@ -229,7 +262,7 @@ fn renew_cfd() {
     verify_cfd_sigs(
         (&maker_cfd_txs, maker.pk, maker_pub_pk),
         (&taker_cfd_txs, taker.pk, taker_pub_pk),
-        (oracle_pk, &nonce_pks),
+        (oracle_pk, vec![event]),
         (&lock_desc, lock_amount),
         (&commit_desc, commit_amount),
     );
@@ -255,7 +288,7 @@ fn renew_cfd() {
             taker_rev_sk,
             taker_addr,
         ),
-        oracle_data,
+        &[oracle_data],
         (lock_desc, lock_amount),
         (commit_desc, commit_amount),
     )
@@ -271,17 +304,19 @@ fn collaboratively_close_cfd() {
     let maker_wallet = build_wallet(&mut rng, Amount::from_btc(0.4).unwrap(), 5).unwrap();
     let taker_wallet = build_wallet(&mut rng, Amount::from_btc(0.4).unwrap(), 5).unwrap();
 
-    let oracle_data = OliviaData::example();
+    let oracle_data = OliviaData::example_0();
     let oracle_pk = oracle_data.pk;
-    let nonce_pks = oracle_data.nonce_pks;
+    let event = oracle_data.announcement();
 
-    let payouts = vec![Payout::new(
-        0..=100_000,
-        Amount::from_btc(1.5).unwrap(),
-        Amount::from_btc(0.5).unwrap(),
-    )
-    .unwrap()]
-    .concat();
+    let payouts_per_event = HashMap::from_iter([(
+        event,
+        generate_payouts(
+            0..=100_000,
+            Amount::from_btc(1.5).unwrap(),
+            Amount::from_btc(0.5).unwrap(),
+        )
+        .unwrap(),
+    )]);
 
     let cet_timelock = 0;
     let refund_timelock = 0;
@@ -290,8 +325,8 @@ fn collaboratively_close_cfd() {
         &mut rng,
         (&maker_wallet, maker_lock_amount),
         (&taker_wallet, taker_lock_amount),
-        (oracle_pk, &nonce_pks),
-        payouts,
+        oracle_pk,
+        payouts_per_event,
         (cet_timelock, refund_timelock),
     );
 
@@ -335,8 +370,8 @@ fn create_cfd_txs(
     rng: &mut (impl RngCore + CryptoRng),
     (maker_wallet, maker_lock_amount): (&bdk::Wallet<(), bdk::database::MemoryDatabase>, Amount),
     (taker_wallet, taker_lock_amount): (&bdk::Wallet<(), bdk::database::MemoryDatabase>, Amount),
-    (oracle_pk, nonce_pks): (schnorrsig::PublicKey, &[schnorrsig::PublicKey]),
-    payouts: Vec<Payout>,
+    oracle_pk: schnorrsig::PublicKey,
+    payouts_per_event: HashMap<Announcement, Vec<Payout>>,
     (cet_timelock, refund_timelock): (u32, u32),
 ) -> (
     CfdTransactions,
@@ -362,6 +397,7 @@ fn create_cfd_txs(
     let taker_params = taker_wallet
         .build_party_params(taker_lock_amount, taker_pk)
         .unwrap();
+
     let maker_cfd_txs = create_cfd_transactions(
         (
             maker_params.clone(),
@@ -377,9 +413,9 @@ fn create_cfd_txs(
                 publish_pk: taker_pub_pk,
             },
         ),
-        (oracle_pk, nonce_pks),
+        oracle_pk,
         (cet_timelock, refund_timelock),
-        payouts.clone(),
+        payouts_per_event.clone(),
         maker_sk,
     )
     .unwrap();
@@ -398,9 +434,9 @@ fn create_cfd_txs(
                 publish_pk: taker_pub_pk,
             },
         ),
-        (oracle_pk, nonce_pks),
+        oracle_pk,
         (cet_timelock, refund_timelock),
-        payouts,
+        payouts_per_event,
         taker_sk,
     )
     .unwrap();
@@ -440,7 +476,7 @@ struct CfdKeys {
 fn verify_cfd_sigs(
     (maker_cfd_txs, maker_pk, maker_publish_pk): (&CfdTransactions, PublicKey, PublicKey),
     (taker_cfd_txs, taker_pk, taker_publish_pk): (&CfdTransactions, PublicKey, PublicKey),
-    (oracle_pk, nonce_pks): (schnorrsig::PublicKey, &[schnorrsig::PublicKey]),
+    (oracle_pk, events): (schnorrsig::PublicKey, Vec<Announcement>),
     (lock_desc, lock_amount): (&Descriptor<PublicKey>, Amount),
     (commit_desc, commit_amount): (&Descriptor<PublicKey>, Amount),
 ) {
@@ -460,44 +496,69 @@ fn verify_cfd_sigs(
         &taker_pk.key,
     )
     .expect("valid taker refund sig");
-    for (tx, _, digits) in taker_cfd_txs.cets.iter() {
-        maker_cfd_txs
+
+    for grouped_taker_cets in taker_cfd_txs.cets.iter() {
+        let grouped_maker_cets = maker_cfd_txs
             .cets
             .iter()
-            .find(|(maker_tx, maker_encsig, _)| {
-                maker_tx.txid() == tx.txid()
-                    && verify_cet_encsig(
-                        tx,
-                        maker_encsig,
-                        digits,
-                        &maker_pk.key,
-                        (oracle_pk, nonce_pks),
-                        commit_desc,
-                        commit_amount,
-                    )
-                    .is_ok()
-            })
-            .expect("one valid maker cet encsig per cet");
+            .find(|grouped_maker_cets| grouped_maker_cets.event == grouped_taker_cets.event)
+            .expect("both parties to have the same set of payouts");
+        let event = events
+            .iter()
+            .find(|event| event.id == grouped_maker_cets.event.id)
+            .expect("event to exist");
+        for (tx, _, digits) in grouped_taker_cets.cets.iter() {
+            grouped_maker_cets
+                .cets
+                .iter()
+                .find(|(maker_tx, maker_encsig, _)| {
+                    maker_tx.txid() == tx.txid()
+                        && verify_cet_encsig(
+                            tx,
+                            maker_encsig,
+                            digits,
+                            &maker_pk.key,
+                            (oracle_pk, event.nonce_pks.as_slice()),
+                            commit_desc,
+                            commit_amount,
+                        )
+                        .is_ok()
+                })
+                .expect("one valid maker cet encsig per cet");
+        }
     }
-    for (tx, _, msg_nonce_pairs) in maker_cfd_txs.cets.iter() {
-        taker_cfd_txs
+
+    for grouped_maker_cets in maker_cfd_txs.cets.iter() {
+        let grouped_taker_cets = taker_cfd_txs
             .cets
             .iter()
-            .find(|(taker_tx, taker_encsig, _)| {
-                taker_tx.txid() == tx.txid()
-                    && verify_cet_encsig(
-                        tx,
-                        taker_encsig,
-                        msg_nonce_pairs,
-                        &taker_pk.key,
-                        (oracle_pk, nonce_pks),
-                        commit_desc,
-                        commit_amount,
-                    )
-                    .is_ok()
-            })
-            .expect("one valid taker cet encsig per cet");
+            .find(|grouped_taker_cets| grouped_taker_cets.event == grouped_maker_cets.event)
+            .expect("both parties to have the same set of payouts");
+        let event = events
+            .iter()
+            .find(|event| event.id == grouped_maker_cets.event.id)
+            .expect("event to exist");
+        for (tx, _, digits) in grouped_maker_cets.cets.iter() {
+            grouped_taker_cets
+                .cets
+                .iter()
+                .find(|(taker_tx, taker_encsig, _)| {
+                    taker_tx.txid() == tx.txid()
+                        && verify_cet_encsig(
+                            tx,
+                            taker_encsig,
+                            digits,
+                            &taker_pk.key,
+                            (oracle_pk, event.nonce_pks.as_slice()),
+                            commit_desc,
+                            commit_amount,
+                        )
+                        .is_ok()
+                })
+                .expect("one valid taker cet encsig per cet");
+        }
     }
+
     encverify_spend(
         &taker_cfd_txs.commit.0,
         &maker_cfd_txs.commit.1,
@@ -557,7 +618,7 @@ fn check_cfd_txs(
         SecretKey,
         Address,
     ),
-    oracle_data: OliviaData,
+    oracle_data_list: &[OliviaData],
     (lock_desc, lock_amount): (Descriptor<PublicKey>, Amount),
     (commit_desc, commit_amount): (Descriptor<PublicKey>, Amount),
 ) {
@@ -604,51 +665,77 @@ fn check_cfd_txs(
 
     // CETs:
 
-    let unlocked_cets = maker_cfd_txs.cets.clone().into_iter().filter_map({
-        |(tx, _, digits)| {
-            let price = oracle_data.price;
+    for Cets { event, cets } in maker_cfd_txs.cets.clone().into_iter() {
+        let oracle_data = oracle_data_list
+            .iter()
+            .find(|data| data.id == event.id)
+            .expect("every cet to correspond to an existing event");
+        let price = oracle_data.price;
+        let oracle_attestations = oracle_data.attestations.clone();
+
+        let taker_cets = taker_cfd_txs
+            .cets
+            .iter()
+            .find_map(
+                |Cets {
+                     event: other_event,
+                     cets,
+                 }| (other_event.id == event.id).then(|| cets),
+            )
+            .expect("same events for taker and maker");
+
+        cets.into_iter().for_each(|(tx, _, digits)| {
             if !digits.range().contains(&price) {
-                return None;
+                return;
             }
 
-            let oracle_attestations = oracle_data.attestations.clone();
             build_and_check_cet(
                 tx,
-                &taker_cfd_txs.cets,
+                taker_cets,
                 (&maker_sk, &maker_pk),
                 &taker_pk,
                 (price, &oracle_attestations),
                 (&signed_commit_tx_maker, &commit_desc, commit_amount),
             )
-            .expect("valid maker cet");
+            .expect("valid unlocked maker cet");
+        });
+    }
 
-            Some(())
-        }
-    });
-    assert_eq!(unlocked_cets.count(), 1, "Expected to unlock only 1 CET");
+    for Cets { event, cets } in taker_cfd_txs.cets.clone().into_iter() {
+        let oracle_data = oracle_data_list
+            .iter()
+            .find(|data| data.id == event.id)
+            .expect("every cet to correspond to an existing event");
+        let price = oracle_data.price;
+        let oracle_attestations = oracle_data.attestations.clone();
 
-    let unlocked_cets = taker_cfd_txs
-        .cets
-        .into_iter()
-        .filter_map(|(tx, _, digits)| {
-            let price = oracle_data.price;
+        let maker_cets = maker_cfd_txs
+            .cets
+            .iter()
+            .find_map(
+                |Cets {
+                     event: other_event,
+                     cets,
+                 }| (other_event.id == event.id).then(|| cets),
+            )
+            .expect("same events for taker and maker");
+
+        cets.into_iter().for_each(|(tx, _, digits)| {
             if !digits.range().contains(&price) {
-                return None;
+                return;
             }
 
             build_and_check_cet(
                 tx,
-                &maker_cfd_txs.cets,
+                maker_cets,
                 (&taker_sk, &taker_pk),
                 &maker_pk,
-                (price, &oracle_data.attestations),
-                (&signed_commit_tx_maker, &commit_desc, commit_amount),
+                (price, &oracle_attestations),
+                (&signed_commit_tx_taker, &commit_desc, commit_amount),
             )
-            .expect("valid taker cet");
-
-            Some(())
+            .expect("valid unlocked taker cet");
         });
-    assert_eq!(unlocked_cets.count(), 1, "Expected to unlock only 1 CET");
+    }
 
     // Punish transactions:
 
@@ -930,6 +1017,7 @@ fn make_keypair(rng: &mut (impl RngCore + CryptoRng)) -> (SecretKey, PublicKey)
 }
 
 struct OliviaData {
+    id: String,
     pk: schnorrsig::PublicKey,
     nonce_pks: Vec<schnorrsig::PublicKey>,
     price: u64,
@@ -937,74 +1025,163 @@ struct OliviaData {
 }
 
 impl OliviaData {
+    fn example_0() -> Self {
+        Self::example(
+            Self::EVENT_ID_0,
+            Self::PRICE_0,
+            &Self::NONCE_PKS_0,
+            &Self::ATTESTATIONS_0,
+        )
+    }
+
+    fn example_1() -> Self {
+        Self::example(
+            Self::EVENT_ID_1,
+            Self::PRICE_1,
+            &Self::NONCE_PKS_1,
+            &Self::ATTESTATIONS_1,
+        )
+    }
+
     /// An example of all the data necessary from `olivia` to test the
     /// CFD protocol.
     ///
     /// Data comes from this event:
     /// https://outcome.observer/h00.ooo/x/BitMEX/BXBT/2021-10-05T02:00:00.price[n:20].
-    pub fn example() -> Self {
-        let pk = schnorrsig::PublicKey::from_str(
-            "ddd4636845a90185991826be5a494cde9f4a6947b1727217afedc6292fa4caf7",
-        )
-        .unwrap();
+    fn example(id: &str, price: u64, nonce_pks: &[&str], attestations: &[&str]) -> Self {
+        let oracle_pk = schnorrsig::PublicKey::from_str(Self::OLIVIA_PK).unwrap();
 
-        let nonce_pks = [
-            "d02d163cf9623f567c4e3faf851a9266ac1ede13da4ca4141f3a7717fba9a739",
-            "bc310f26aa5addbc382f653d8530aaead7c25e3546abc24639f490e36d4bdb88",
-            "2661375f570dcc32300d442e85b6d72dfa3232dccda45e8fb4a2d1e758d1d374",
-            "fcc68fbf071d391b14c0867cb4defb5a8abc12418dff3dfc2f84fd4025cb2716",
-            "cf5c2b7fe3851c64a7ff9635a9bfc50cdd301401d002f2da049f4c6a20e8457b",
-            "14f1005d8c2832a2c4666dd732dd9bb3af9c8f70ebcdaec96869b1ca0c8e0de6",
-            "299ee1c9c20fab8b067adf452a7d7661b5e7f5dd6bc707562805002e7cb8443e",
-            "bcb4e5a594346de298993a7a31762f598b5224b977e23182369e9ed3e5127f78",
-            "25e09a16ee5d469069abfb62cd5e1f20af50cf15241f571e64fa28b127304574",
-            "3ed5a1422f43299caf281123aba88bd4bc61ec863f4afb79c7ce7663ad44db5d",
-            "a7e0f61212735c192c4bf16e0a3e925e65f9f3feb6f1e5e8d6f5c18cf2dbb5a8",
-            "a36a631015d9036d0c321fea7cf12f589aa196e7279b4a290de5112c2940e540",
-            "b5bdd931f81970139e7301ac654b378077c3ed993ca7893ed93fee5fc6f7a782",
-            "00090816e256b41e042dce38bde99ab3cf9482f9b066836988d3ed54833638e8",
-            "3530408e93c251f5f488d3b1c608157177c459d6fab1966abebf765bcc9338d2",
-            "603269ce88d112ff7fcfcaab82f228be97deca37f8190084d509c71b51a30432",
-            "f0587414fcc6c56aef11d4a1d287ad6b55b237c5b8a5d5d93eb9ca06f6466ccf",
-            "763009afb0ffd99c7b835488cb3b0302f3b78f59bbfd5292bedab8ef9da8c1b7",
-            "3867af9048309a05004a164bdea09899f23ff1d83b6491b2b53a1b7b92e0eb2e",
-            "688118e6b59e27944c277513db2711a520f4283c7c53a11f58d9f6a46d82c964",
-        ]
-        .iter()
-        .map(|pk| schnorrsig::PublicKey::from_str(pk).unwrap())
-        .collect();
-
-        let attestations = [
-            "5bc7663195971daaa1e3e6a81b4bca65882791644bc446fc060cbc118a3ace0f",
-            "721d0cb56a0778a1ca7907f81a0787f34385b13f854c845c4c5539f7f6267958",
-            "044aeef0d525c8ff48758c80939e95807bc640990cc03f53ab6fc0b262045221",
-            "79f5175423ec6ee69c8d0e55251db85f3015c2edfa5a03095443fbbf35eb2282",
-            "233b9ec549e9cc7c702109d29636db85a3ec63a66f3b53444bcc7586d36ca439",
-            "2961a00320b7c9a70220060019a6ca88e18c205fadd2f873c174e5ccbbed527e",
-            "bdb76e8f81c39ade4205ead9b68118757fc49ec22769605f26ef904b235283d6",
-            "6e75dafedf4ed685513ec1f5c93508de4fad2be05b46001ac00c03474f4690e1",
-            "cfcfc27eb9273b343b3042f0386e77efe329066be079788bb00ab47d72f26780",
-            "2d931ffd2963e74566365674583abc427bdb6ae571c4887d81f1920f0850665d",
-            "33b6f1112fa046cbc04be44c615e70519702662c1f72d8d49b3c4613614a8a46",
-            "19e569b15410fa9a758c1a6c211eae8c1547efbe0ac6a7709902be93415f2f09",
-            "d859dd5c9a58e1836d1eea3ebe7f48198a681d29e5a5cd6922532d2e94a53a1d",
-            "3387eb2ad5e64cd102167766bb72b447f4a2e5129d161e422f9d41cd7d1cc281",
-            "db35a9778a1e3abc8d8ab2f4a79346ae2154c9e0b4932d859d1f3e244f67ae76",
-            "c3be969e8b889cfb2ece71123e6be5538a2d3a1229637b18bccc179073c38059",
-            "6f73263f430e10b82d0fd06c4ddd3b8a6b58c3e756745bd0d9e71a399e517921",
-            "0818c9c245d7d2162cd393c562a121f80405a27d22ae465e95030c31ebb4bd24",
-            "b7c03f0bd6d63bd78ad4ea0f3452ff9717ba65ca42038e6e90a1aa558b7942dc",
-            "90c4d8ec9f408ccb62a62daa993c20f2f86799e1fdea520c6d060418e55fd216",
-        ]
-        .iter()
-        .map(|pk| SecretKey::from_str(pk).unwrap())
-        .collect();
+        let id = id.to_string();
+
+        let nonce_pks = nonce_pks
+            .iter()
+            .map(|pk| schnorrsig::PublicKey::from_str(pk).unwrap())
+            .collect();
+
+        let attestations = attestations
+            .iter()
+            .map(|pk| SecretKey::from_str(pk).unwrap())
+            .collect();
 
         Self {
-            pk,
+            id,
+            pk: oracle_pk,
             nonce_pks,
             attestations,
-            price: 49262,
+            price,
+        }
+    }
+
+    fn announcement(&self) -> Announcement {
+        Announcement {
+            id: self.id.clone(),
+            nonce_pks: self.nonce_pks.clone(),
         }
     }
+
+    const OLIVIA_PK: &'static str =
+        "ddd4636845a90185991826be5a494cde9f4a6947b1727217afedc6292fa4caf7";
+
+    const EVENT_ID_0: &'static str = "/x/BitMEX/BXBT/2021-10-05T02:00:00.price[n:20]";
+    const NONCE_PKS_0: [&'static str; 20] = [
+        "d02d163cf9623f567c4e3faf851a9266ac1ede13da4ca4141f3a7717fba9a739",
+        "bc310f26aa5addbc382f653d8530aaead7c25e3546abc24639f490e36d4bdb88",
+        "2661375f570dcc32300d442e85b6d72dfa3232dccda45e8fb4a2d1e758d1d374",
+        "fcc68fbf071d391b14c0867cb4defb5a8abc12418dff3dfc2f84fd4025cb2716",
+        "cf5c2b7fe3851c64a7ff9635a9bfc50cdd301401d002f2da049f4c6a20e8457b",
+        "14f1005d8c2832a2c4666dd732dd9bb3af9c8f70ebcdaec96869b1ca0c8e0de6",
+        "299ee1c9c20fab8b067adf452a7d7661b5e7f5dd6bc707562805002e7cb8443e",
+        "bcb4e5a594346de298993a7a31762f598b5224b977e23182369e9ed3e5127f78",
+        "25e09a16ee5d469069abfb62cd5e1f20af50cf15241f571e64fa28b127304574",
+        "3ed5a1422f43299caf281123aba88bd4bc61ec863f4afb79c7ce7663ad44db5d",
+        "a7e0f61212735c192c4bf16e0a3e925e65f9f3feb6f1e5e8d6f5c18cf2dbb5a8",
+        "a36a631015d9036d0c321fea7cf12f589aa196e7279b4a290de5112c2940e540",
+        "b5bdd931f81970139e7301ac654b378077c3ed993ca7893ed93fee5fc6f7a782",
+        "00090816e256b41e042dce38bde99ab3cf9482f9b066836988d3ed54833638e8",
+        "3530408e93c251f5f488d3b1c608157177c459d6fab1966abebf765bcc9338d2",
+        "603269ce88d112ff7fcfcaab82f228be97deca37f8190084d509c71b51a30432",
+        "f0587414fcc6c56aef11d4a1d287ad6b55b237c5b8a5d5d93eb9ca06f6466ccf",
+        "763009afb0ffd99c7b835488cb3b0302f3b78f59bbfd5292bedab8ef9da8c1b7",
+        "3867af9048309a05004a164bdea09899f23ff1d83b6491b2b53a1b7b92e0eb2e",
+        "688118e6b59e27944c277513db2711a520f4283c7c53a11f58d9f6a46d82c964",
+    ];
+    const PRICE_0: u64 = 49262;
+    const ATTESTATIONS_0: [&'static str; 20] = [
+        "5bc7663195971daaa1e3e6a81b4bca65882791644bc446fc060cbc118a3ace0f",
+        "721d0cb56a0778a1ca7907f81a0787f34385b13f854c845c4c5539f7f6267958",
+        "044aeef0d525c8ff48758c80939e95807bc640990cc03f53ab6fc0b262045221",
+        "79f5175423ec6ee69c8d0e55251db85f3015c2edfa5a03095443fbbf35eb2282",
+        "233b9ec549e9cc7c702109d29636db85a3ec63a66f3b53444bcc7586d36ca439",
+        "2961a00320b7c9a70220060019a6ca88e18c205fadd2f873c174e5ccbbed527e",
+        "bdb76e8f81c39ade4205ead9b68118757fc49ec22769605f26ef904b235283d6",
+        "6e75dafedf4ed685513ec1f5c93508de4fad2be05b46001ac00c03474f4690e1",
+        "cfcfc27eb9273b343b3042f0386e77efe329066be079788bb00ab47d72f26780",
+        "2d931ffd2963e74566365674583abc427bdb6ae571c4887d81f1920f0850665d",
+        "33b6f1112fa046cbc04be44c615e70519702662c1f72d8d49b3c4613614a8a46",
+        "19e569b15410fa9a758c1a6c211eae8c1547efbe0ac6a7709902be93415f2f09",
+        "d859dd5c9a58e1836d1eea3ebe7f48198a681d29e5a5cd6922532d2e94a53a1d",
+        "3387eb2ad5e64cd102167766bb72b447f4a2e5129d161e422f9d41cd7d1cc281",
+        "db35a9778a1e3abc8d8ab2f4a79346ae2154c9e0b4932d859d1f3e244f67ae76",
+        "c3be969e8b889cfb2ece71123e6be5538a2d3a1229637b18bccc179073c38059",
+        "6f73263f430e10b82d0fd06c4ddd3b8a6b58c3e756745bd0d9e71a399e517921",
+        "0818c9c245d7d2162cd393c562a121f80405a27d22ae465e95030c31ebb4bd24",
+        "b7c03f0bd6d63bd78ad4ea0f3452ff9717ba65ca42038e6e90a1aa558b7942dc",
+        "90c4d8ec9f408ccb62a62daa993c20f2f86799e1fdea520c6d060418e55fd216",
+    ];
+
+    const EVENT_ID_1: &'static str = "/x/BitMEX/BXBT/2021-10-05T08:00:00.price[n:20]";
+    const NONCE_PKS_1: [&'static str; 20] = [
+        "150df2e64f39706e726eaa1fe081af3edf376d9644723e135a99328fd194caca",
+        "b90629cedc7cb8430b4d15c84bbe1fe173e70e626d40c465e64de29d4879e20f",
+        "ae14ffb8701d3e224b6632a1bb7b099c8aa90979c3fb788422daa08bca25fa68",
+        "3717940a7e8c35b48b3596498ed93e4d54ba01a2bcbb645d30dae2fc98f087a8",
+        "91beb5da91cc8b4ee6ae603e7ae41cc041d5ea2c13bae9f0e630c69f6c0adfad",
+        "c51cafb450b01f30ec8bd2b4b5fed6f7e179f49945959f0d7609b4b9c5ab3781",
+        "75f2d9332aa1b2d84446a4b2aa276b4c2853659ab0ba74f0881289d3ab700f0c",
+        "5367de73acb53e69b0a4f777e564f87055fede5d4492ddafae876a815fa6166c",
+        "2087a513adb1aa2cc8506ca58306723ed13ba82e054f5bf29fcbeef1ab915c5a",
+        "71c980fb6adae9c121405628c91daffcc5ab52a8a0b6f53c953e8a0236b05782",
+        "d370d22f06751fc649f6ee930ac7f8f3b00389fdad02883a8038a81c46c33b19",
+        "fa6f7d37dc88b510c250dcae1023cce5009d5beb85a75f5b8b10c973b62348aa",
+        "a658077f9c963d1f41cf63b7ebf6e08331f5d201554b3af7814673108abe1bf3",
+        "8a816bf4caa2d6114b2e4d3ab9bff0d470ee0b90163c78c9b67f90238ead9319",
+        "c2519a4e764a65204c469062e260d8565f7730847c507b92c987e478ca91abe1",
+        "59cb6b5beac6511a671076530cc6cc9f1926f54c640828f38c363b110dd8a0cd",
+        "4625b1f3ab9ee01455fa1a98d15fc8d73a7cf41becb4ca5c6eab88db0ba7c114",
+        "82a4de403c604fe40aa3804c5ada6af54c425c0576980b50f259d32dc1a0fcff",
+        "5c4fb87b3812982759ed7264676e713e4e477a41759261515b04797db393ef62",
+        "f3f6b9134c0fdd670767fbf478fd0dd3430f195ce9c21cabb84f3c1dd4848a11",
+    ];
+    const PRICE_1: u64 = 49493;
+    const ATTESTATIONS_1: [&'static str; 20] = [
+        "605f458e9a7bd216ff522e45f6cd14378c03ccfd4d35a69b9b6ce5c4ebfc89fa",
+        "edc7215277d2c24a7a4659ff8831352db609fcc467fead5e27fdada172cdfd86",
+        "1c2d76fcbe724b1fabd2622b991e90bbb2ea9244489de960747134c9fd695dcb",
+        "26b4f078c9ca2233b18b0e42c4bb9867e5de8ee35b500e30b28d9b1742322e49",
+        "2b59aeaacb80056b45dc12d6525d5c75343ef75730623c8d9893e2b681bf4b85",
+        "782e38e777d527e7cb0028a6d03e8f760c6202dbc5ac605f67f995919dee6182",
+        "a902f37f71a78e4bcf431a778024bd775db6d7ade0626a9e7bc4cdf0b1e52dfd",
+        "3927eb5ef3b56817c08709e0af1bb643ad4d95dbf5a92a49e1e9c8c811e929c4",
+        "9ff44fa9d8377a3531792cd6362e4a5b24b86d85602749d301f8449859065b77",
+        "6a2156ff0aaef174b36d5f8adc597fdcb26f306f7ef6e9a485faabc8eb29da2e",
+        "53445b507c0de312959fe4566b82db93987dd0b854f1a33bbad7768512bcaf69",
+        "793c40e0ec3a830c46658bfaed7df74e3fc6781e421e00db5b5f46b26ce4d092",
+        "db7f800da2f22878c8fc8368047308146e1ebd6316c389303c07ebeed7488fc9",
+        "73921d09e0d567a03f3a411c0f3455f9f652bbede808a694cca0fa94619f5ba9",
+        "3d4bd70d93f20aa6b1621ccd077c90bcdee47ce2bae15155434a77a3153a3235",
+        "90fc10577ab737e311b43288a266490f222a6ecb9f9667e01d7a54c0437d145f",
+        "51d350616c6fdf90254240b757184fc0dd226328adb42be214ec25832854950e",
+        "bab3a6269e172ac590fd36683724f087b4add293bb0ee4ef3d21fb5929985c75",
+        "d65a4c71062fc0b0210bb3e239f60d826a37d28caadfc52edd7afde6e91ff818",
+        "ea5dfd972784808a15543f850c7bc86bff2b51cff81ec68fc4c3977d5e7d38de",
+    ];
+}
+
+fn assert_contains_cets_for_event(cets: &[Cets], event: &Announcement) {
+    assert!(!cets
+        .iter()
+        .find(|cet| cet.event.id == event.id)
+        .expect("cet to correspond to existing event")
+        .cets
+        .is_empty());
 }

daemon/src/model/cfd.rs

@@ -11,6 +11,7 @@ use rust_decimal::prelude::{FromPrimitive, ToPrimitive};
 use rust_decimal::Decimal;
 use rust_decimal_macros::dec;
 use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
 use std::fmt;
 use std::ops::{Neg, RangeInclusive};
 use std::time::{Duration, SystemTime};
@@ -1060,6 +1061,6 @@ pub struct Dlc {
     /// The fully signed lock transaction ready to be published on chain
     pub lock: (Transaction, Descriptor<PublicKey>),
     pub commit: (Transaction, EcdsaAdaptorSignature, Descriptor<PublicKey>),
-    pub cets: Vec<(Transaction, EcdsaAdaptorSignature, RangeInclusive<u64>)>,
+    pub cets: HashMap<String, Vec<(Transaction, EcdsaAdaptorSignature, RangeInclusive<u64>)>>,
     pub refund: (Transaction, Signature),
 }

daemon/src/monitor.rs

@@ -25,7 +25,7 @@ pub struct StartMonitoring {
 pub struct MonitorParams {
     lock: (Txid, Descriptor<PublicKey>),
     commit: (Txid, Descriptor<PublicKey>),
-    cets: Vec<(Txid, Script, RangeInclusive<u64>)>,
+    cets: HashMap<String, Vec<(Txid, Script, RangeInclusive<u64>)>>,
     refund: (Txid, Script, u32),
 }
 
@@ -221,6 +221,9 @@ where
 
     async fn handle_oracle_attestation(&mut self, attestation: oracle::Attestation) -> Result<()> {
         for (order_id, MonitorParams { cets, .. }) in self.cfds.clone().into_iter() {
+            let cets = cets
+                .get(&attestation.id)
+                .context("No CET for oracle event found")?;
             let (txid, script_pubkey) =
                 match cets.iter().find_map(|(txid, script_pubkey, range)| {
                     range
@@ -468,9 +471,16 @@ impl MonitorParams {
             commit: (dlc.commit.0.txid(), dlc.commit.2),
             cets: dlc
                 .cets
-                .into_iter()
-                .map(|(tx, _, range)| (tx.txid(), script_pubkey.clone(), range))
-                .collect(),
+                .iter()
+                .map(|(event_id, cets)| {
+                    (
+                        event_id.clone(),
+                        cets.iter()
+                            .map(|(tx, _, range)| (tx.txid(), script_pubkey.clone(), range.clone()))
+                            .collect::<Vec<_>>(),
+                    )
+                })
+                .collect::<HashMap<_, _>>(),
             refund: (
                 dlc.refund.0.txid(),
                 script_pubkey,

daemon/src/setup_contract.rs

@@ -9,14 +9,20 @@ use bdk::descriptor::Descriptor;
 use cfd_protocol::secp256k1_zkp::EcdsaAdaptorSignature;
 use cfd_protocol::{
     commit_descriptor, compute_adaptor_pk, create_cfd_transactions, interval, lock_descriptor,
-    spending_tx_sighash, PartyParams, PunishParams,
+    spending_tx_sighash, Announcement, PartyParams, PunishParams,
 };
 use futures::stream::FusedStream;
 use futures::{Sink, SinkExt, StreamExt};
 use std::collections::HashMap;
+use std::iter::FromIterator;
 use std::ops::RangeInclusive;
 
-/// Given an initial set of parameters, sets up the CFD contract with the other party.
+/// Given an initial set of parameters, sets up the CFD contract with
+/// the other party.
+///
+/// TODO: Replace `nonce_pks` argument with set of
+/// `daemon::oracle::Announcement`, which can be mapped into
+/// `cfd_protocol::Announcement`.
 pub async fn new(
     mut sink: impl Sink<SetupMsg, Error = anyhow::Error> + Unpin,
     mut stream: impl FusedStream<Item = SetupMsg> + Unpin,
@@ -61,17 +67,23 @@ pub async fn new(
         )
     }
 
-    let payouts = payout_curve::calculate(
-        cfd.order.price,
-        cfd.quantity_usd,
-        params.maker().lock_amount,
-        (params.taker().lock_amount, cfd.order.leverage),
-    )?;
+    let payouts = HashMap::from_iter([(
+        Announcement {
+            id: "dummy_id_to_be_replaced".to_string(),
+            nonce_pks: nonce_pks.clone(),
+        },
+        payout_curve::calculate(
+            cfd.order.price,
+            cfd.quantity_usd,
+            params.maker().lock_amount,
+            (params.taker().lock_amount, cfd.order.leverage),
+        )?,
+    )]);
 
     let own_cfd_txs = create_cfd_transactions(
         (params.maker().clone(), *params.maker_punish()),
         (params.taker().clone(), *params.taker_punish()),
-        (oracle_pk, &nonce_pks),
+        oracle_pk,
         (
             model::cfd::Cfd::CET_TIMELOCK,
             cfd.refund_timelock_in_blocks(),
@@ -84,6 +96,7 @@ pub async fn new(
     sink.send(SetupMsg::Msg1(Msg1::from(own_cfd_txs.clone())))
         .await
         .context("Failed to send Msg1")?;
+
     let msg1 = stream
         .select_next_some()
         .await
@@ -122,15 +135,22 @@ pub async fn new(
     )
     .context("Punish adaptor signature does not verify")?;
 
-    verify_cets(
-        (&oracle_pk, &[]),
-        &params.other,
-        &own_cets,
-        &msg1.cets,
-        &commit_desc,
-        commit_amount,
-    )
-    .context("CET signatures don't verify")?;
+    for own_grouped_cets in &own_cets {
+        let other_cets = msg1
+            .cets
+            .get(&own_grouped_cets.event.id)
+            .context("Expect event to exist in msg")?;
+
+        verify_cets(
+            (&oracle_pk, &nonce_pks),
+            &params.other,
+            own_grouped_cets.cets.as_slice(),
+            other_cets.as_slice(),
+            &commit_desc,
+            commit_amount,
+        )
+        .context("CET signatures don't verify")?;
+    }
 
     let lock_tx = own_cfd_txs.lock;
     let refund_tx = own_cfd_txs.refund.0;
@@ -144,11 +164,6 @@ pub async fn new(
     )
     .context("Refund signature does not verify")?;
 
-    let mut cet_by_digits = own_cets
-        .into_iter()
-        .map(|(tx, _, digits)| (digits.range(), (tx, digits)))
-        .collect::<HashMap<_, _>>();
-
     let mut signed_lock_tx = wallet.sign(lock_tx).await?;
     sink.send(SetupMsg::Msg2(Msg2 {
         signed_lock: signed_lock_tx.clone(),
@@ -168,6 +183,37 @@ pub async fn new(
     // need some fallback handling (after x time) to spend the outputs in a different way so the
     // other party cannot hold us hostage
 
+    let cets = own_cets
+        .into_iter()
+        .map(|grouped_cets| {
+            let event_id = grouped_cets.event.id;
+            let other_cets = msg1
+                .cets
+                .get(&event_id)
+                .with_context(|| format!("Counterparty CETs for event {} missing", event_id))?;
+            let cets = grouped_cets
+                .cets
+                .into_iter()
+                .map(|(tx, _, digits)| {
+                    let other_encsig = other_cets
+                        .iter()
+                        .find_map(|(other_range, other_encsig)| {
+                            (other_range == &digits.range()).then(|| other_encsig)
+                        })
+                        .with_context(|| {
+                            format!(
+                                "Missing counterparty adaptor signature for CET corresponding to
+                                 price range {:?}",
+                                digits.range()
+                            )
+                        })?;
+                    Ok((tx, *other_encsig, digits.range()))
+                })
+                .collect::<Result<Vec<_>>>()?;
+            Ok((event_id, cets))
+        })
+        .collect::<Result<HashMap<_, _>>>()?;
+
     Ok(Dlc {
         identity: sk,
         identity_counterparty: params.other.identity_pk,
@@ -176,16 +222,7 @@ pub async fn new(
         address: params.own.address,
         lock: (signed_lock_tx.extract_tx(), lock_desc),
         commit: (commit_tx, msg1.commit, commit_desc),
-        cets: msg1
-            .cets
-            .into_iter()
-            .map(|(range, sig)| {
-                let (cet, digits) = cet_by_digits.remove(&range).context("unknown CET")?;
-
-                Ok((cet, sig, digits.range()))
-            })
-            .collect::<Result<Vec<_>>>()
-            .context("Failed to re-map CETs")?,
+        cets,
         refund: (refund_tx, msg1.refund),
     })
 }

daemon/src/wire.rs

@@ -10,6 +10,7 @@ use cfd_protocol::secp256k1_zkp::EcdsaAdaptorSignature;
 use cfd_protocol::{CfdTransactions, PartyParams, PunishParams};
 use serde::de::DeserializeOwned;
 use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
 use std::fmt;
 use std::marker::PhantomData;
 use std::ops::RangeInclusive;
@@ -228,19 +229,29 @@ impl From<Msg0> for (PartyParams, PunishParams) {
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Msg1 {
     pub commit: EcdsaAdaptorSignature,
-    pub cets: Vec<(RangeInclusive<u64>, EcdsaAdaptorSignature)>,
+    pub cets: HashMap<String, Vec<(RangeInclusive<u64>, EcdsaAdaptorSignature)>>,
     pub refund: Signature,
 }
 
 impl From<CfdTransactions> for Msg1 {
     fn from(txs: CfdTransactions) -> Self {
+        let cets = txs
+            .cets
+            .into_iter()
+            .map(|grouped_cets| {
+                (
+                    grouped_cets.event.id,
+                    grouped_cets
+                        .cets
+                        .into_iter()
+                        .map(|(_, encsig, digits)| (digits.range(), encsig))
+                        .collect::<Vec<_>>(),
+                )
+            })
+            .collect::<HashMap<_, _>>();
         Self {
             commit: txs.commit.1,
-            cets: txs
-                .cets
-                .into_iter()
-                .map(|(_, sig, digits)| (digits.range(), sig))
-                .collect(),
+            cets,
             refund: txs.refund.1,
         }
     }