
## Blockchain with Go

Simple example to understand and learn about Blockchain. 

```bash
go build
```

Next
```bash
$ ./blockchain history
Mining the block with data "GenesisBlock"
00002bcb38688ce4b1ca7b4b7dd28a079d5de93c01e8fae26e326f8b1c983fc3

Prev. hash:
Data: GenesisBlock
Hash: 00002bcb38688ce4b1ca7b4b7dd28a079d5de93c01e8fae26e326f8b1c983fc3
PoW Validation: true

$ ./blockchain add -data "Pay 1 BTC for a car"
Mining the block with data "Pay 1 BTC for a car"
0000613f831bf20420fe5465405b23631d5422514161d8fa9db4b1abe69d6d1b

Done!

$ ./blockchain history
Prev. hash: 00002bcb38688ce4b1ca7b4b7dd28a079d5de93c01e8fae26e326f8b1c983fc3
Data: Pay 1 BTC for a car
Hash: 0000613f831bf20420fe5465405b23631d5422514161d8fa9db4b1abe69d6d1b
PoW Validation: true

Prev. hash:
Data: GenesisBlock
Hash: 00002bcb38688ce4b1ca7b4b7dd28a079d5de93c01e8fae26e326f8b1c983fc3
PoW Validation: true

```


Meet the Socket Team at BlackHat and DEF CON in Las Vegas, Aug 4-6

github.com/douglasmakey/blockchain

blockchain

(Experimental) An ambiguous license classifier was found.

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Ambiguous License Classifier

Source files are encoded using a non-standard text encoding.

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Bad text encoding

Package version is not a valid semantic version (semver).

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Bad semver

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Bad dependency semver

Source files contain bidirectional unicode control characters. This could indicate a Trojan source supply chain attack. See: trojansource.codes for more information.

What are bidirectional unicode control characters?

Bidirectional unicode control characters

This package has multiple bin scripts with the same name. This can cause non-deterministic behavior when installing or could be a sign of a supply chain attack.

What is bin script confusion?

Bin script confusion

This Chrome extension includes a content script '{scriptFile}' that runs on websites matching '{matches}'.

What are Chrome extension content scripts?

Chrome Extension Content Script

This Chrome extension requests access to '{host}'.

What are Chrome extension host permissions?

Chrome Extension Host Permission

This Chrome extension uses the '{permission}' permission.

What are Chrome extension permissions?

Chrome Extension Permission

This Chrome extension requests broad access to websites with the pattern '{host}'.

What are Chrome extension wildcard host permissions?

Chrome Extension Wildcard Host Permission

Semantic versions published out of chronological order.

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Chronological version anomaly

Project maintainer's SSH key has been compromised.

What is a compromised SSH key?

Compromised SSH key

(Experimental) Copyleft license information was found.

What do I need to know about license files?

Copyleft License

Contains a Critical Common Vulnerability and Exposure (CVE).

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Title

Critical CVE

Contains a high severity Common Vulnerability and Exposure (CVE).

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High CVE

Uses debug, reflection and dynamic code execution features.

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Debug access

The maintainer of the package marked it as deprecated. This could indicate that a single version should not be used, or that the package is no longer maintained and any new vulnerabilities will not be fixed.

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Deprecated

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Deprecated SPDX exception

(Experimental) License is deprecated which may have legal implications regarding the package's use.

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Deprecated license

Package name is similar to other popular packages and may not be the package you want.

What is a typosquat?

Possible typosquat attack

Dynamic require can indicate the package is performing dangerous or unsafe dynamic code execution.

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Dynamic require

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Empty package

Package accesses environment variables, which may be a sign of credential stuffing or data theft.

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Environment variable access

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Name

Extraneous dependency

Contains a dependency which resolves to a file. This can obfuscate analysis and serves no useful purpose.

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File dependency

Accesses the file system, and could potentially read sensitive data.

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Filesystem access

Package has a dependency with a floating version range. This can cause issues if the dependency publishes a new major version.

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Wildcard dependency

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Git dependency

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GitHub dependency

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AI-detected potential code anomaly

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AI-detected potential malware

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AI-detected potential security risk

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Native code

Contains high entropy strings. This could be a sign of encrypted data, leaked secrets or obfuscated code.

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High entropy strings

Contains unicode homoglyphs which can be used in supply chain confusion attacks.

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Unicode homoglyphs

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HTTP dependency

Install scripts are run when the package is installed. The majority of malware in npm is hidden in install scripts.

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Install scripts

Package has an invalid manifest file and can cause installation problems if you try to use it.

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Invalid manifest file

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What are invisible characters?

Invisible chars

(Experimental) Package license has recently changed.

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License change

(Experimental) Contains an SPDX license exception.

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License exception

This package is not allowed per your license policy. Review the package's license to ensure compliance.

What is a license policy violation?

License Policy Violation

Contains long string literals, which may be a sign of obfuscated or packed code.

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Long strings

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

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Major refactor

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Known malware

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Manifest confusion

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Medium CVE

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Low CVE

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Minified code

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Misc. License Issues

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Non-existent author

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Modified license exception

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Modified license

What is network access?

Network access

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New author

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No contributors or author data

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No bug tracker

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No repository

Package does not have any tests. This is a strong signal of a poorly maintained or low quality package.

github.com/douglasmakey/blockchain

Blockchain with Go

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