[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Crypto](https://evolu.dev/docs/api-reference/common/Crypto) › Entropy64

```ts
const Entropy64: length(64)(Entropy);
```

Defined in: [packages/common/src/Crypto.ts:126](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Crypto.ts#L126)

Cryptographic entropy of exactly 64 bytes.