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Update SWC-120.md #298

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17 changes: 17 additions & 0 deletions entries/docs/SWC-120.md
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# Please note, this content is no longer actively maintained.

The content of the SWC registry has not been thoroughly updated since 2020. It is known to be incomplete and may contain errors as well as crucial omissions.

For currently maintained guidance on known Smart Contract vulnerabilities written primarily as guidance for security reviewers, please see the
[EEA EthTrust Security Levels specification](https://entethalliance.org/specs/ethtrust-sl). As well as the latest release version, an
[Editor's draft](https://entethalliance.github.io/eta-registry/security-levels-spec.html) is available,
that represents the latest work of the group developing the specification.

General guidance for developers on what to consider to ensure security, that is currently maintained, is also available through the
[Smart Contract Security Verification Standard (SCSVS)](https://github.com/ComposableSecurity/SCSVS).

# Title

Weak Sources of Randomness from Chain Attributes
Expand All @@ -23,6 +35,11 @@ Ability to generate random numbers is very helpful in all kinds of applications.
- [When can BLOCKHASH be safely used for a random number? When would it be unsafe?](https://ethereum.stackexchange.com/questions/419/when-can-blockhash-be-safely-used-for-a-random-number-when-would-it-be-unsafe)
- [The Run smart contract](https://etherscan.io/address/0xcac337492149bdb66b088bf5914bedfbf78ccc18)

### EEA EthTrust Security Levels Specification

- [**[M] Sources of Randomness**](https://entethalliance.org/specs/ethtrust-sl/#req-2-random-enough)
- [**[M] Document Special Code Use**](https://entethalliance.org/specs/ethtrust-sl/#req-2-documented)

## Samples

### guess_the_random_number.sol
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