SCRU128: Sortable, Clock and Random number-based Unique identifier

SCRU128 ID is yet another attempt to supersede [UUID] for the users who need decentralized, globally unique time-ordered identifiers. SCRU128 is inspired by [ULID] and [KSUID] and has the following features:

• 128-bit unsigned integer type
• Sortable by generation time (as integer and as text)
• 25-digit case-insensitive textual representation (Base36)
• 48-bit millisecond Unix timestamp that ensures useful life until year 10889
• Up to 281 trillion time-ordered but unpredictable unique IDs per millisecond
• 80-bit three-layer randomness for global uniqueness

```rust use scru128::{scru128, scru128_string};

// generate a new identifier object let x = scru128(); println!("{}", x); // e.g. "036Z951MHJIKZIK2GSL81GR7L" println!("{}", x.to_u128()); // as a 128-bit unsigned integer

// generate a textual representation directly println!("{}", scru128_string()); // e.g. "036Z951MHZX67T63MQ9XE6Q0J" ```

See [SCRU128 Specification] for details.

Crate features

Default features:

• std enables the primary scru128() and scru128_string() functions and configures Scru128Generator with the system clock and default random number generator. Without std, this crate provides limited functionality available under no_std environments. Note that the no_std support is experimental.

Optional features:

• serde enables serialization/deserialization via serde.

License

Licensed under the Apache License, Version 2.0.

See also

• docs.rs/scru128