---
id: "blake2b256hash"
kind: "datatype"
status: "stable"
is_pii: false
categories: ["cryptography"]
langs: ["common"]
quality: 85
url: "http://registry.apicrafter.io/datatype/blake2b256hash"
---

# BLAKE2b-256 hash (`blake2b256hash`)

Digest of the BLAKE2b hash function with a 256-bit output. It is written as 64 hexadecimal digits. Other 256-bit digests (SHA-256, SHA3-256, Keccak-256, BLAKE3 and Streebog-256) have the same length, so the value alone does not tell them apart: use the field name or context.

- Parent datatype: `hash`
- Personal data (PII): no
- Categories: Cryptographic identifiers (cryptography)
- Countries: global
- Languages: Common to most languages (common)
- Classification: identifier

## Detection

Regular expression (Python `re`):

```
^[0-9a-fA-F]{64}$
```

## Examples

- `0e5751c026e543b2e8ab2eb06099daa1d1e5df47778f7787faab45cdf12fe3a8` — BLAKE2b-256 hash of the empty string
- `bddd813c634239723171ef3fee98579b94964e3bb1cb3e427262c8c068d52319` — BLAKE2b-256 hash of the string 'abc'
- `0e5751c026e543b2e8ab2eb06099daa1d1e5df47778f7787faab45cdf12fe3a` (invalid example) — one hex digit short (63 instead of 64)

## Metacrafter rules

2 rules: 1 match the field name, 1 match values.

- `blake2b256hash` (data, `basic/crypto.yaml`)
- `blake2b256hash_by_field` (field, `basic/crypto.yaml`)

## Supported by tools

- `metacrafter`

## Sources

- wikipedia: <https://en.wikipedia.org/wiki/BLAKE_(hash_function)>
- doc: <https://www.rfc-editor.org/rfc/rfc7693>

## Quality

Score 85/100. Missing: mapping (Wikidata, Schema.org, ...), translation.

JSON: <http://registry.apicrafter.io/api/v1/datatypes/blake2b256hash.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/any/cryptography/blake2b256hash.yaml>