---
language:
- en
tags:
- solidity
- blockchain
- ethereum
- smart-contract
pretty_name: Zellic Smart Contract Source Index
size_categories:
- 100K<n<1M
---
# Zellic 2023 Smart Contract Source Index

Zellic is making publicly available a dataset of known Ethereum mainnet smart contract source code.

Our aim is to provide a contract source code dataset that is readily available to the public to download in bulk. We believe this dataset will help advance the frontier of smart contract security research. Applications include static analysis, machine learning, and more. This effort is part of Zellic’s mission to create a world with no smart contract hacks.

## Methodology

First, we accumulated a list of all deployed contracts on Ethereum mainnet as of block 16860349. This does not include contracts that have been `SELFDESTRUCT`ed. We progressively built up this index by performing a full sync from the genesis block using the modified Geth instance. Whenever a new contract was created, we added it to our index. When a contract `SELFDESTRUCT`ed, we removed it from the index. This list is available in this dataset as the file `address_bytecodehash_index`.

Next, we collected contract source code from publicly available online sources. All data was obtained from publicly accessible resources.

Finally, we calculated all of the Keccak256 hashes of the deployed runtime EVM bytecode of each contract. We deduplicated contract source code by bytecode hash. In other words, we organized the contract source code set by the bytecode hash of their corresponding verified contracts. For example, if source codes A and B are both verified against smart contracts X and Y with the same deployed EVM bytecode, we only include one of A or B in this dataset. Choosing among duplicates was arbitrarily.

## Dataset Statistics

**Number of unique source codes, by bytecode hash**: 149,386

**Contracts with code available**: 3,897,319 (This is more than the previous number, because MANY contracts share identical bytecode)

**Number of smart contracts in global index**: 30,586,657 (not all have source code available, see Methodology)

| **Chars (wc -c)** | **Words (wc -w)** | **LoC (code)** | **LoC (comments)** | **LoC (whitespace)** | **LoC (total)** |
|-------------------|-------------------|----------------|--------------------|----------------------|-----------------|
| 6,473,548,073     | 712,444,206       | 90,562,628     | 62,503,873         | 24,485,549           | 177,552,050     |

**Unique words**: 939,288

## Dataset Structure

### Index

The `address_bytecodehash_index` file contains a list of known smart contract addresses mapped to the Keccak256 hash of their EVM bytecode.

Look up the smart contract address in this file to find the source. This file also serves as a list of all deployed smart contracts as of block 16860349.

**Not all contracts in the index file will have source code available.** This is a list of **all** deployed smart contracts as of block 16860349. (See Methodology).

Excerpt of data from the index for preview purposes:

```
...
00012e87fa9172d0c613f69d0abf752bb00310ec:4f5a5f6706dc853cb3ae2279729e0d7e24dda128a77358144e4c0fd3e5d60e98
00012c8ef0fef0a06e1644ab91107fe8584fb91e:a828ef7f5f6d2ebb1203de12878e16aa5ba6984c12ededff4e19876233533505
00012df38ea3a6dabefb8407a59219a0c7dd0bc8:c279544d07d9631b1e37d835cadfe7098d60e508cf8f18a89ddb8b176d56874d
00012d92a0e7ee1b19f8e018267c97a3a7e99aa7:0865cec1e9ac3048b12a85fc3b9fbc682c3831784e3396416635df4cb88c3fdd
00012f07e281c1d8a9d790358050b6015eef942c:ab7af4c77ed6371c7eda04ba317a134f0b06593c0dc2851bf4c709a367ea50ed
00012e198745e53293bf09ddec8da1284963fded:ce33220d5c7f0d09d75ceff76c05863c5e7d6e801c70dfe7d5d45d4c44e80654
00012ec2c9fc4a1692176da5202a44a4aea5e177:ce33220d5c7f0d09d75ceff76c05863c5e7d6e801c70dfe7d5d45d4c44e80654
...
```

### Contract Sources

Smart Contract sources are organized by folder in the `organized_contracts` directory.

For example, a contract with the bytecode hash `beef3d7d1884c4fee50548cfe762415fe494e3feb1e6ca181352ef023ba1ff7a` would be in the directory `organized_contracts/be/beef3d7d1884c4fee50548cfe762415fe494e3feb1e6ca181352ef023ba1ff7a/`.

Each folder for a smart contract contains the source files as well as a `metadata.json` that contains information about the contract such as the compiler version and optimizations used. These settings can be used to attempt to reproduce the build.

Example of metadata.json for preview purposes (unminified for ease of viewing):

```json
{
  "ContractName": "MageSpace",
  "CompilerVersion": "v0.8.10+commit.fc410830",
  "Runs": 200,
  "OptimizationUsed": false,
  "BytecodeHash": "c2f8f4e79a9d7c23d8a398768e1476f03f0e11c44fc7441c021e098c71678d03"
}
```

#### Source Formats

Contracts may come in one of three source formats. Single file, multiple files, and [Solidity Compiler JSON](https://docs.soliditylang.org/en/v0.8.19/using-the-compiler.html#compiler-api).

For multiple file contacts, each `.sol` file will be included in the directory.

Single file contracts will be named `main.sol`. Some contracts are written in Vyper, not Solidity. These will be named `main.vy`.

For Solidity Compiler Input JSON, the compiler input will be stored in `contract.json`.

**Not all contract code is in Solidity. Some contract code is in Vyper, or other languages! Check metadata.json!**

As a quick-and-dirty script, to extract all of the source code, you can use this bash script:

```bash
mkdir code
cd organized_contracts/
for f in * ; do
    echo $f
    cat $f/*/contract.json | jq '.sources | to_entries[].value.content' -r  > ../code/"$f".txt
    cat $f/*/*.sol > ../code/"$f".txt
done
```

### Other Fun Facts

Top 100 words:

<details>
  <summary>Click to expand</summary>
<pre>
23189252 the
20816285 address
16207663 uint256
14793579 to
13746030 function
9952507 returns
9069124 0
8256548 a
8189582 of
6854095 is
6783298 dev
6363279 return
5555811 if
5497552 memory
5403232 from
5203839 amount
5146685 internal
4838549 value
4753195 be
4700814 external
4676440 owner
4535518 this
4477899 view
4463166 for
4205382 bool
3770805 contract
3732595 token
3719841 and
3578693 public
3447968 string
3422923 tokenid
3243596 require
3134425 1
3063929 in
2996585 bytes
2976900 data
2831472 by
2748878 transfer
2729742 account
2605117 that
2588692 param
2535414 private
2465042 an
2418190 solidity
2377723 uint
2333621 call
2326567 not
2319841 virtual
2295154 zero
2220201 sender
2118342 as
2113922 sol
2024428 target
1945888 event
1919425 s
1901005 or
1899022 pure
1884128 tokens
1859283 must
1850785 it
1796854 with
1783457 contracts
1760318 b
1742610 revert
1711696 spender
1698735 bytes32
1655261 recipient
1645305 i
1608529 indexed
1585283 true
1575421 2
1551352 when
1528254 can
1475879 length
1466789 override
1444666 will
1356364 approve
1355666 8
1314732 notice
1304351 implementation
1293963 are
1291253 import
1290551 on
1267019 balance
1257438 available
1253286 log
1232433 pragma
1211177 since
1193506 msgsender
1193496 result
1190481 liquidity
1185869 msg
1181724 operator
1178211 errormessage
1176497 slot
1156971 set
1154460 openzeppelin
1148764 cannot
1123141 erc20
1115019 abi
</pre>
</details>

## Notices

The smart contract source code in this dataset were obtained from publicly available sources. You should always abide by the appropriate code and software licenses, as well as all applicable copyright law.

THE DATASET/SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE DATASET/SOFTWARE OR THE USE OR OTHER DEALINGS IN THE DATASET/SOFTWARE.