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src/state.cairo

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+
+
+// https://developer.bitcoin.org/reference/block_chain.html#block-headers
+#[derive(Drop, Clone)]
+struct Header {
+    pub version: u32,
+    pub prev_block_hash: u256,
+    pub merkle_root_hash: u256,
+    pub time: u32,
+    pub bits: u32,
+    pub nonce: u32
+}
+
+// https://developer.bitcoin.org/reference/transactions.html#txin-a-transaction-input-non-coinbase
+#[derive(Drop, Clone)]
+pub struct TxIn {
+    txid: u256,
+    index: u32,
+    script: ByteArray,
+    sequence: u32,
+}
+
+// https://developer.bitcoin.org/reference/transactions.html#txout-a-transaction-output
+#[derive(Drop, Clone)]
+pub struct TxOut {
+    value: i64, // TODO: why signed?
+    pk_script: ByteArray
+}
+
+// https://developer.bitcoin.org/reference/transactions.html#raw-transaction-format
+#[derive(Drop, Clone)]
+pub struct Transaction {
+    pub version: i32,
+    pub inputs: Span<TxIn>,
+    pub outputs: Span<TxOut>,
+    pub lock_time: u32,
+}
+
+#[derive(Drop, Clone)]
+pub struct Block {
+    pub header: Header,
+    // TODO: how to handle coinbase transactions?
+    pub txs: Span<Transaction>
+}
+
+#[derive(Drop, Clone)]
+pub struct ChainState {
+    pub block_height: u32, // not u256?
+    pub total_work: u256,
+    pub best_block_hash: u256,
+    pub current_target: u32,
+    pub epoch_start_time: u32,
+    pub prev_timestamps: Span<u32>,
+    // TODO: utreexo_roots?
+}
+
+trait BlockValidator {
+    fn validate_and_apply(block: Block) -> Result<ChainState, ByteArray>;
+}