Working on UTXO model

utxo/Cargo.lock

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utxo/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "ledger-utxo"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+async-trait = "0.1.73"
+bincode = { version = "1.3.3", features = ["i128"] }
+futures = "0.3.28"
+hex = "0.4.3"
+serde = { version = "1.0.188", features = ["derive"] }
+sha2 = "0.10.7"
+sqlx = { version = "0.7.1", features = ["runtime-tokio", "tls-native-tls", "sqlite"] }
+strum = "0.25.0"
+strum_macros = "0.25.2"
+thiserror = "1.0.48"
+tokio = { version = "1.32.0", features = ["full"] }
+
+[dev-dependencies]
+sqlx = { version = "0.7.1", features = ["sqlite"] }
+
+[features]
+default = []
+sqlite = ["sqlx/sqlite"]

utxo/src/account_id.rs

@@ -0,0 +1,24 @@
+use std::fmt::Display;
+
+use serde::Serialize;
+
+#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq, Serialize)]
+pub struct AccountId(pub [u8; 32]);
+
+impl AccountId {
+    pub fn new() -> Self {
+        Self([0; 32])
+    }
+}
+
+impl Display for AccountId {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", hex::encode(self.0))
+    }
+}
+
+impl AsRef<[u8]> for AccountId {
+    fn as_ref(&self) -> &[u8] {
+        &self.0
+    }
+}

utxo/src/amount.rs

@@ -0,0 +1,42 @@
+use crate::Asset;
+use serde::Serialize;
+
+pub type AmountCents = i128;
+
+/// Amount
+///
+/// The cents are stored in their lowest denomination, or their "cents".  For
+/// instance a Bitcoin would be represented with a `precision` of 8, or dollars
+/// in a 2 or 3.
+///
+/// For instance, if the dollar Asset has a `precision` of `2`, an `cents` of
+/// 1255 will represent `12.55 USD`.
+///
+/// Amount will abstract all the math operations that can be performed with the
+/// amounts, guarding that the `Asset` are the same before performing any
+/// operation.
+///
+///
+/// The `cents` and `Asset.id` must be used to store amounts in the storge
+/// layer. Float or string representations should be used to display
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+pub struct Amount {
+    asset: Asset,
+    cents: AmountCents,
+}
+
+impl Amount {
+    pub fn new(asset: Asset, cents: AmountCents) -> Self {
+        Self { asset, cents }
+    }
+
+    #[inline]
+    pub fn asset(&self) -> &Asset {
+        &self.asset
+    }
+
+    #[inline]
+    pub fn cents(&self) -> AmountCents {
+        self.cents
+    }
+}

utxo/src/asset.rs

@@ -0,0 +1,24 @@
+use serde::{Deserialize, Serialize};
+use std::fmt::Display;
+
+pub type AssetId = u32;
+
+/// An asset
+///
+/// The asset definition is just a u32 number, which is meaningless for the
+/// code, as long as each asset has an unique id.
+///
+/// The asset struct also has a precision, which is a u8 number (from 0-255)
+/// which is used by amount when converting the inner_amount to a human readable
+/// format.
+#[derive(Copy, Clone, Debug, Eq, Hash, PartialEq, Serialize, Deserialize)]
+pub struct Asset {
+    pub id: AssetId,
+    precision: u8,
+}
+
+impl Display for Asset {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.id)
+    }
+}

utxo/src/asset_manager.rs

@@ -0,0 +1,43 @@
+use crate::{amount::AmountCents, asset::AssetId, Amount, Asset, Error};
+use std::{collections::HashMap, sync::Arc};
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct AssetManager {
+    assets: HashMap<AssetId, AssetDefinition>,
+}
+
+#[derive(Clone, Debug, Eq, PartialEq, serde::Deserialize)]
+pub struct AssetDefinition {
+    #[serde(flatten)]
+    asset: Asset,
+    name: Arc<str>,
+}
+
+impl AssetManager {
+    pub fn new(assets: Vec<AssetDefinition>) -> Self {
+        Self {
+            assets: assets
+                .into_iter()
+                .map(|asset| (asset.asset.id, asset))
+                .collect(),
+        }
+    }
+
+    pub fn asset(&self, id: AssetId) -> Result<Asset, Error> {
+        self.assets
+            .get(&id)
+            .map(|asset| asset.asset)
+            .ok_or(Error::AssetNotFound(id))
+    }
+
+    pub fn asset_name(&self, asset: &Asset) -> Result<Arc<str>, Error> {
+        self.assets
+            .get(&asset.id)
+            .map(|asset| asset.name.clone())
+            .ok_or(Error::AssetNotFound(asset.id))
+    }
+
+    pub fn amount(&self, id: AssetId, cents: AmountCents) -> Result<Amount, Error> {
+        self.asset(id).map(|asset| Amount::new(asset, cents))
+    }
+}

utxo/src/error.rs

@@ -0,0 +1,16 @@
+use crate::{asset::AssetId, storage, transaction, AccountId};
+
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("Transaction: {0}")]
+    Transaction(#[from] transaction::Error),
+
+    #[error("Storage: {0}")]
+    Storage(#[from] storage::Error),
+
+    #[error("Asset {0} is not defined")]
+    AssetNotFound(AssetId),
+
+    #[error("Not enough funds (asset {1}) for account {0}")]
+    InsufficientBalance(AccountId, AssetId),
+}

utxo/src/ledger.rs

@@ -0,0 +1,116 @@
+use crate::{
+    amount::AmountCents, storage, AccountId, Amount, AssetManager, Batch, Error, PaymentId,
+    Storage, Transaction,
+};
+use futures::TryStreamExt;
+use std::{collections::HashMap, sync::Arc};
+
+#[derive(Clone, Debug)]
+pub struct Ledger<B, I, S>
+where
+    B: Batch,
+    I: TryStreamExt<Ok = (PaymentId, AmountCents), Error = storage::Error> + Unpin,
+    S: Storage<B, I>,
+{
+    storage: Arc<S>,
+    asset_manager: Arc<AssetManager>,
+    _phantom_batch: std::marker::PhantomData<B>,
+    _phantom_iterator: std::marker::PhantomData<I>,
+}
+
+impl<B, I, S> Ledger<B, I, S>
+where
+    B: Batch,
+    I: TryStreamExt<Ok = (PaymentId, AmountCents), Error = storage::Error> + Unpin,
+    S: Storage<B, I>,
+{
+    pub fn new(storage: S, asset_manager: AssetManager) -> Self {
+        Self {
+            storage: Arc::new(storage),
+            asset_manager: Arc::new(asset_manager),
+            _phantom_batch: std::marker::PhantomData,
+            _phantom_iterator: std::marker::PhantomData,
+        }
+    }
+
+    pub async fn get_balance(&self, account: AccountId) -> Result<Vec<Amount>, Error> {
+        self.storage
+            .get_balance(account)
+            .await?
+            .into_iter()
+            .map(|(asset, cents)| self.asset_manager.amount(asset, cents))
+            .collect::<Result<Vec<_>, _>>()
+    }
+
+    async fn normalize_payments_to_spend(
+        &self,
+        payments: Vec<(AccountId, Amount)>,
+    ) -> Result<Vec<(AccountId, Amount)>, Error> {
+        let mut to_spend = HashMap::new();
+        let mut balances = HashMap::new();
+        for (account_id, amount) in payments.into_iter() {
+            if balances.get(&account_id).is_none() {
+                balances.insert(account_id, self.get_balance(account_id).await?);
+            }
+            let id = (account_id, *amount.asset());
+            if let Some(value) = to_spend.get_mut(&id) {
+                *value += amount.cents();
+            } else {
+                to_spend.insert(id, amount.cents());
+            }
+        }
+
+        for ((account, asset), mut to_spend_cents) in to_spend.into_iter() {
+            let mut payment_ids: Vec<PaymentId> = vec![];
+            let mut iterator = self.storage.get_unspend_payments(account, asset.id).await?;
+            while let Some((payment_id, cents)) = iterator.try_next().await? {
+                payment_ids.push(payment_id);
+                to_spend_cents -= cents;
+                if to_spend_cents < 0 {
+                    // We have enough payment_id to to cover the to_spend_cents
+                    // Any negative number will be the return to the account
+                    break;
+                }
+            }
+        }
+
+        /*
+               to_spend
+                   .into_iter()
+                   .map(|((account_id, asset), cents)| (account_id, Amount::new(asset, cents)))
+                   .collect::<Vec<_>>()
+                   .into_iter()
+                   .map(|(id, to_debit)| {
+                       balances
+                           .get(&id)
+                           .ok_or_else(|| Error::InsufficientBalance(id, to_debit.asset().id))
+                           .map(|balances| {
+                               if let Some(available) = balances
+                                   .iter()
+                                   .find(|asset| asset.asset() == to_debit.asset())
+                                   .map(|amount| amount.cents())
+                               {
+                                   if to_debit.cents() > available {
+                                       Err(Error::InsufficientBalance(id, to_debit.asset().id))
+                                   } else {
+                                       Ok((id, to_debit))
+                                   }
+                               } else {
+                                   Err(Error::InsufficientBalance(id, to_debit.asset().id))
+                               }
+                           })
+                   })
+                   .collect::<Result<Result<Vec<_>, _>, _>>()?
+        */
+        todo!()
+    }
+
+    pub async fn new_transaction<'a>(
+        &self,
+        from: Vec<(AccountId, Amount)>,
+        to: Vec<(AccountId, Amount)>,
+    ) -> Result<Transaction<'a, B, I, S>, Error> {
+        let from = self.normalize_payments_to_spend(from).await?;
+        todo!()
+    }
+}

utxo/src/lib.rs

@@ -0,0 +1,25 @@
+mod account_id;
+mod amount;
+mod asset;
+mod asset_manager;
+mod error;
+mod ledger;
+mod payment;
+#[cfg(any(feature = "sqlite", test))]
+mod sqlite;
+mod status;
+mod storage;
+mod transaction;
+
+pub use self::{
+    account_id::AccountId,
+    amount::Amount,
+    asset::Asset,
+    asset_manager::AssetManager,
+    error::Error,
+    ledger::Ledger,
+    payment::{Payment, PaymentId},
+    status::Status,
+    storage::{Batch, Storage},
+    transaction::Transaction,
+};

utxo/src/payment.rs

@@ -0,0 +1,23 @@
+use crate::{AccountId, Amount};
+use serde::Serialize;
+
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+pub struct PaymentId {
+    pub transaction: AccountId,
+    pub position: usize,
+}
+
+impl ToString for PaymentId {
+    fn to_string(&self) -> String {
+        format!("{}:{}", hex::encode(self.transaction), self.position)
+    }
+}
+
+#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
+pub struct Payment {
+    pub id: PaymentId,
+    pub to: AccountId,
+    pub amount: Amount,
+    #[serde(skip)]
+    pub spent_by: Option<AccountId>,
+}

utxo/src/sqlite/mod.rs

@@ -0,0 +1,81 @@
+use std::marker::PhantomData;
+
+use crate::{
+    storage::{self, Error},
+    AccountId, Payment, PaymentId,
+};
+use sqlx::{Sqlite, Transaction as SqlxTransaction};
+
+pub struct Batch<'a> {
+    inner: SqlxTransaction<'a, Sqlite>,
+    x: PhantomData<&'a ()>,
+}
+
+#[async_trait::async_trait]
+impl<'a> storage::Batch for Batch<'a> {
+    async fn spend_payment(
+        &mut self,
+        payment_id: PaymentId,
+        transaction_id: AccountId,
+    ) -> Result<(), Error> {
+        let result = sqlx::query(
+            r#"
+                UPDATE payments SET spent_by = ?
+                WHERE transaction_id = ? AND position_id = ? AND spent_by IS NULL
+            "#,
+        )
+        .bind(transaction_id.to_string())
+        .bind(payment_id.transaction.to_string())
+        .bind(payment_id.position.to_string())
+        .execute(&mut *self.inner)
+        .await
+        .map_err(|e| Error::Storage(e.to_string()))?;
+        if result.rows_affected() == 1 {
+            Ok(())
+        } else {
+            Err(Error::NoUpdate)
+        }
+    }
+
+    async fn rollback(self) -> Result<(), Error> {
+        self.inner
+            .rollback()
+            .await
+            .map_err(|e| Error::Storage(e.to_string()))
+    }
+
+    async fn commit(self) -> Result<(), Error> {
+        self.inner
+            .commit()
+            .await
+            .map_err(|e| Error::Storage(e.to_string()))
+    }
+
+    async fn store_new_payments(&mut self, payments: &[Payment]) -> Result<(), Error> {
+        for payment in payments.iter() {
+            sqlx::query(
+                r#"
+                INSERT INTO payments(transaction_id, position_id, to, amount, asset, spent_by)
+                VALUES (?, ?, ?, ?, ?, ?)
+            "#,
+            )
+            .bind(payment.id.transaction.to_string())
+            .bind(payment.id.position.to_string())
+            .bind(payment.to.to_string())
+            .bind(payment.amount.cents().to_string())
+            .bind(payment.amount.asset().id)
+            .bind(payment.spent_by.map(|id| id.to_string()))
+            .execute(&mut *self.inner)
+            .await
+            .map_err(|e| Error::Storage(e.to_string()))?;
+        }
+        Ok(())
+    }
+
+    async fn store_transaction(&mut self) -> Result<(), Error> {
+        todo!()
+    }
+}
+
+#[cfg(test)]
+mod test {}

utxo/src/status.rs

@@ -0,0 +1,120 @@
+use strum_macros::Display;
+
+/// Transaction status
+#[derive(Clone, Eq, PartialEq, Debug, Display)]
+pub enum Status {
+    /// Pending status
+    ///
+    /// A transaction has been created. At this status the transaction can be
+    /// Cancelled.
+    /// From Processing it can be moved to Settled or Failed.
+    Pending,
+    /// Processing
+    ///
+    /// The transaction leaves the Pending status and it cannot longer be
+    /// Cancelled by an external event.
+    Processing,
+    /// Cancelled.
+    ///
+    /// The transaction has been Cancelled, the funds that were burned are
+    /// released and can be used again.
+    Cancelled,
+    /// Settled
+    ///
+    /// The transaction is settled, the inputs used to create the transaction
+    /// are forever burned.
+    Settled,
+    /// Failed
+    ///
+    /// The transaction has failed, the inputs used to create the transaction
+    /// are released and can be used again.
+    Failed,
+}
+
+impl Default for Status {
+    fn default() -> Self {
+        Self::Pending
+    }
+}
+
+impl Status {
+    /// Checks if the current status can transition to the new state.
+    pub fn can_transition_to(&self, new_status: &Status) -> bool {
+        if self == new_status {
+            false
+        } else {
+            match self {
+                Self::Pending => true,
+                Self::Processing => {
+                    matches!(new_status, Self::Cancelled | Self::Settled | Self::Failed)
+                }
+                _ => false,
+            }
+        }
+    }
+
+    /// Checks if the transaction status is finalized
+    pub fn is_finalized(&self) -> bool {
+        matches!(self, Self::Cancelled | Self::Settled | Self::Failed)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn pending() {
+        let status = Status::Pending;
+        assert!(!status.can_transition_to(&Status::Pending));
+        assert!(status.can_transition_to(&Status::Processing));
+        assert!(status.can_transition_to(&Status::Cancelled));
+        assert!(status.can_transition_to(&Status::Settled));
+        assert!(status.can_transition_to(&Status::Failed));
+        assert!(!status.is_finalized());
+    }
+
+    #[test]
+    fn processing() {
+        let status = Status::Processing;
+        assert!(!status.can_transition_to(&Status::Pending));
+        assert!(!status.can_transition_to(&Status::Processing));
+        assert!(status.can_transition_to(&Status::Cancelled));
+        assert!(status.can_transition_to(&Status::Settled));
+        assert!(status.can_transition_to(&Status::Failed));
+        assert!(!status.is_finalized());
+    }
+
+    #[test]
+    fn cancelled() {
+        let status = Status::Cancelled;
+        assert!(!status.can_transition_to(&Status::Pending));
+        assert!(!status.can_transition_to(&Status::Processing));
+        assert!(!status.can_transition_to(&Status::Cancelled));
+        assert!(!status.can_transition_to(&Status::Settled));
+        assert!(!status.can_transition_to(&Status::Failed));
+        assert!(status.is_finalized());
+    }
+
+    #[test]
+    fn settled() {
+        let status = Status::Settled;
+        assert!(!status.can_transition_to(&Status::Pending));
+        assert!(!status.can_transition_to(&Status::Processing));
+        assert!(!status.can_transition_to(&Status::Cancelled));
+        assert!(!status.can_transition_to(&Status::Settled));
+        assert!(!status.can_transition_to(&Status::Failed));
+        assert!(status.is_finalized());
+    }
+
+    #[test]
+    fn failed() {
+        let status = Status::Failed;
+        assert!(!status.can_transition_to(&Status::Pending));
+        assert!(!status.can_transition_to(&Status::Processing));
+        assert!(!status.can_transition_to(&Status::Cancelled));
+        assert!(!status.can_transition_to(&Status::Settled));
+        assert!(!status.can_transition_to(&Status::Failed));
+        assert!(status.is_finalized());
+    }
+}

utxo/src/storage.rs

@@ -0,0 +1,43 @@
+use crate::{amount::AmountCents, asset::AssetId, AccountId, Payment, PaymentId};
+use futures::TryStreamExt;
+
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("Storage error: {0}")]
+    Storage(String),
+
+    #[error("No storage update when expecting")]
+    NoUpdate,
+}
+
+#[async_trait::async_trait]
+pub trait Batch {
+    async fn spend_payment(
+        &mut self,
+        payment_id: PaymentId,
+        transaction_id: AccountId,
+    ) -> Result<(), Error>;
+
+    async fn rollback(self) -> Result<(), Error>;
+
+    async fn commit(self) -> Result<(), Error>;
+
+    async fn store_new_payments(&mut self, outputs: &[Payment]) -> Result<(), Error>;
+
+    async fn store_transaction(&mut self) -> Result<(), Error>;
+}
+
+#[async_trait::async_trait]
+pub trait Storage<B, I>
+where
+    B: Batch,
+    I: TryStreamExt<Ok = (PaymentId, AmountCents), Error = Error> + Unpin,
+{
+    async fn get_payment(&self, id: PaymentId) -> Result<Payment, Error>;
+
+    async fn begin(&self) -> Result<B, Error>;
+
+    async fn get_balance(&self, account: AccountId) -> Result<Vec<(AssetId, AmountCents)>, Error>;
+
+    async fn get_unspend_payments(&self, account: AccountId, asset: AssetId) -> Result<I, Error>;
+}

utxo/src/transaction/error.rs

@@ -0,0 +1,33 @@
+use crate::{amount::AmountCents, storage, Asset, Status};
+
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("Payment {0} is already spent")]
+    SpentPayment(usize),
+
+    #[error(
+        "Payment {0} is not a valid amount. Spending {1} and issuing {2}. Both amounts must match"
+    )]
+    InvalidAmount(Asset, AmountCents, AmountCents),
+
+    #[error("Missing input payment for asset {0}")]
+    MissingSpendingAsset(Asset),
+
+    #[error("Missing output payment for asset {0}")]
+    MissingPaymentAsset(Asset),
+
+    #[error("Transaction updates are not allowed")]
+    TransactionUpdatesNotAllowed,
+
+    #[error("Mismatch between spend and create payment assets")]
+    MismatchSpendingPayingAssets,
+
+    #[error("Status transition from {0} to {1} is not allowed")]
+    StatusTransitionNotAllowed(Status, Status),
+
+    #[error("Storage: {0}")]
+    Storage(#[from] storage::Error),
+
+    #[error("Overflow")]
+    Overflow,
+}

utxo/src/transaction/mod.rs

@@ -0,0 +1,182 @@
+use crate::{
+    amount::AmountCents, storage, AccountId, Asset, Batch, Payment, PaymentId, Status, Storage,
+};
+use futures::{future::join_all, TryStreamExt};
+use sha2::{Digest, Sha256};
+use std::collections::HashMap;
+
+mod error;
+
+pub use error::Error;
+
+/// Transactions
+///
+/// Transactions are the core components of the ledger. The transactions are a
+/// list of unspent payments that are about to be spend, to create a new set of
+/// Payments, that can be spend in the future. This model is heavily inspired in
+/// Bitcoin's UTXO model. The terms in this context are payments, spend and
+/// create instead of unspent transactions, input and output.
+///
+/// This simple architecture allows to track accounts pretty efficiently,
+/// because all that matters are unspent payments owned by a given account.
+/// Every spent payment is stored for historical reasons but it is not relevant
+/// for any calculations regarding available funds.
+///
+/// The transaction has a few rules, for instance the sum of spend Payments
+/// should be the same as create Payments, for each easy. There is no 'fee'
+/// concept, so any mismatch in any direction will error the constructor.
+///
+/// Transactions are immutable after they are finalized, and the payments can
+/// only be re-usable if the transaction failed or was cancelled. Once the
+/// transaction settles the spent payments are forever spent. Any rollback
+/// should be a new transaction, initiated by a higher layer.
+///
+/// The spent payments are unavailable until the transaction is finalized,
+/// either as settled, cancelled or failed. A higher layer should split any
+/// available payment to be spend into a new transaction, and then finalize the
+/// transaction, and reserve only the exact amount to be spent, otherwise
+/// unrelated funds will be held unspendable until the transaction is finalized.
+#[derive(Debug, Clone)]
+pub struct Transaction<'a, B, I, S>
+where
+    B: Batch,
+    I: TryStreamExt<Ok = (PaymentId, AmountCents), Error = storage::Error> + Unpin,
+    S: Storage<B, I>,
+{
+    storage: &'a S,
+    id: Option<AccountId>,
+    spend: Vec<Payment>,
+    create: Vec<Payment>,
+    status: Status,
+    _phantom_batch: std::marker::PhantomData<B>,
+    _phantom_iterator: std::marker::PhantomData<I>,
+}
+
+impl<'a, B, I, S> Transaction<'a, B, I, S>
+where
+    B: Batch,
+    I: TryStreamExt<Ok = (PaymentId, AmountCents), Error = storage::Error> + Unpin,
+    S: Storage<B, I>,
+{
+    pub async fn new(
+        storage: &'a S,
+        input_ids: Vec<PaymentId>,
+    ) -> Result<Transaction<'a, B, I, S>, Error> {
+        let futures = input_ids
+            .into_iter()
+            .map(|id| storage.get_payment(id))
+            .collect::<Vec<_>>();
+        let spend = join_all(futures)
+            .await
+            .into_iter()
+            .collect::<Result<Vec<Payment>, _>>()?;
+        for (i, input) in spend.iter().enumerate() {
+            if input.spent_by.is_some() {
+                return Err(Error::SpentPayment(i));
+            }
+        }
+
+        Ok(Self {
+            storage,
+            id: None,
+            spend,
+            status: Status::default(),
+            create: Vec::new(),
+            _phantom_batch: std::marker::PhantomData,
+            _phantom_iterator: std::marker::PhantomData,
+        })
+    }
+
+    pub fn change_status(&mut self, new_status: Status) -> Result<(), Error> {
+        if self.status.can_transition_to(&new_status) {
+            self.status = new_status;
+            Ok(())
+        } else {
+            Err(Error::StatusTransitionNotAllowed(
+                self.status.clone(),
+                new_status,
+            ))
+        }
+    }
+
+    fn validate(&mut self) -> Result<(), Error> {
+        let mut sha256 = Sha256::new();
+        let mut debit = HashMap::<Asset, AmountCents>::new();
+        let mut credit = HashMap::<Asset, AmountCents>::new();
+
+        for (i, input) in self.spend.iter().enumerate() {
+            if input.spent_by.is_some() {
+                return Err(Error::SpentPayment(i));
+            }
+            if let Some(value) = debit.get_mut(input.amount.asset()) {
+                *value = input
+                    .amount
+                    .cents()
+                    .checked_add(*value)
+                    .ok_or(Error::Overflow)?;
+            } else {
+                debit.insert(*input.amount.asset(), input.amount.cents());
+            }
+            let bytes: Vec<u8> = bincode::serialize(&input).unwrap();
+            sha256.update(&bytes);
+        }
+
+        for (i, output) in self.create.iter().enumerate() {
+            if output.spent_by.is_some() {
+                return Err(Error::SpentPayment(i));
+            }
+            if let Some(value) = credit.get_mut(output.amount.asset()) {
+                *value = output
+                    .amount
+                    .cents()
+                    .checked_add(*value)
+                    .ok_or(Error::Overflow)?;
+            } else {
+                credit.insert(*output.amount.asset(), output.amount.cents());
+            }
+            let bytes: Vec<u8> = bincode::serialize(&output).unwrap();
+            sha256.update(&bytes);
+        }
+
+        for (asset, credit_amount) in credit.into_iter() {
+            if let Some(debit_amount) = debit.remove(&asset) {
+                if debit_amount != credit_amount {
+                    return Err(Error::InvalidAmount(asset, debit_amount, credit_amount));
+                }
+            } else {
+                return Err(Error::MissingSpendingAsset(asset));
+            }
+        }
+
+        if let Some((asset, _)) = debit.into_iter().next() {
+            return Err(Error::MissingPaymentAsset(asset));
+        }
+
+        self.id = Some(AccountId(sha256.finalize().into()));
+        Ok(())
+    }
+
+    pub fn spent(&self) -> &[Payment] {
+        &self.spend
+    }
+
+    pub fn created(&self) -> &[Payment] {
+        &self.create
+    }
+
+    pub async fn persist(mut self) -> Result<Transaction<'a, B, I, S>, Error> {
+        if self.status.is_finalized() {
+            return Err(Error::TransactionUpdatesNotAllowed);
+        }
+        self.validate()?;
+        let mut batch = self.storage.begin().await?;
+        batch.store_new_payments(&self.create).await?;
+        let id = self.id.as_ref().unwrap();
+        for input in self.spend.iter_mut() {
+            batch.spend_payment(input.id, *id).await?;
+            input.spent_by = Some(*id);
+        }
+        batch.commit().await?;
+        Ok(self)
+    }
+}