60 lines
2.2 KiB
Rust
60 lines
2.2 KiB
Rust
//! Implementation of Zcash consensus checks.
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//!
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//! More specifically, this crate implements *semantic* validity checks,
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//! as defined below.
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//!
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//! ## Verification levels.
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//!
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//! Zebra's implementation of the Zcash consensus rules is oriented
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//! around three telescoping notions of validity:
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//!
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//! 1. *Structural Validity*, or whether the format and structure of the
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//! object are valid. For instance, Sprout-on-BCTV14 proofs are not
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//! allowed in version 4 transactions, and a transaction with a spend
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//! or output description must include a binding signature.
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//!
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//! 2. *Semantic Validity*, or whether the object could potentially be
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//! valid, depending on the chain state. For instance, a transaction
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//! that spends a UTXO must supply a valid unlock script; a shielded
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//! transaction must have valid proofs, etc.
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//!
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//! 3. *Contextual Validity*, or whether a semantically valid
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//! transaction is actually valid in the context of a particular
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//! chain state. For instance, a transaction that spends a
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//! UTXO is only valid if the UTXO remains unspent; a
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//! shielded transaction spending some note must reveal a nullifier
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//! not already in the nullifier set, etc.
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//!
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//! *Structural validity* is enforced by the definitions of data
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//! structures in `zebra-chain`. *Semantic validity* is enforced by the
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//! code in this crate. *Contextual validity* is enforced in
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//! `zebra-state` when objects are committed to the chain state.
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#![doc(html_favicon_url = "https://zfnd.org/wp-content/uploads/2022/03/zebra-favicon-128.png")]
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#![doc(html_logo_url = "https://zfnd.org/wp-content/uploads/2022/03/zebra-icon.png")]
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#![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_consensus")]
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mod block;
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mod checkpoint;
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mod config;
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#[allow(dead_code)]
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mod parameters;
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mod primitives;
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mod script;
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pub mod transaction;
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pub mod chain;
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#[allow(missing_docs)]
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pub mod error;
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pub use block::VerifyBlockError;
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pub use checkpoint::{
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CheckpointList, VerifyCheckpointError, MAX_CHECKPOINT_BYTE_COUNT, MAX_CHECKPOINT_HEIGHT_GAP,
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};
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pub use config::Config;
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pub use error::BlockError;
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pub use primitives::groth16;
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/// A boxed [`std::error::Error`].
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pub type BoxError = Box<dyn std::error::Error + Send + Sync + 'static>;
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