HugCoin — Source Verification

Verified source code for the HugCoin contract deployed to Ethereum mainnet on August 23, 2016.

Contract	0xb83CAb8BAbC0B9298dF5D5283c30bF0D89D23b1E
Block	2,123,297
Creation TX	0x55113c4d...
Compiler	Solidity v0.3.5, optimizer enabled
Author	Jon Romero (@jonromero)
Original source	jonromero/ethereum_contracts/HugCoin.eth

Verify

./verify.sh

Requires node and curl. Downloads the solc binary automatically on first run.

✅ EXACT MATCH
   Runtime bytecode: 1715 bytes
   Compiler: solc v0.3.5+commit.5f97274a (optimizer enabled)
   Contract: 0xb83CAb8BAbC0B9298dF5D5283c30bF0D89D23b1E

Also matches exactly with v0.3.3 and v0.3.4 (optimizer enabled). The creation bytecode (3,100 bytes, excluding 96-byte constructor args) is also a byte-perfect match.

Source

HugCoin.sol compiles to a byte-perfect match of the on-chain runtime bytecode (1,715 bytes).

The original source was published on jon.io and GitHub alongside a blog post explaining the contract. The file is lightly renamed from .eth to .sol for compiler compatibility; no code changes were made.

How It Works

HugCoin is an ERC-20-compatible "infinite hug" token with a social twist:

• Unlimited supply — everyone can give as many hugs as they want, forever
• transfer(address, uint256) — mints 1 HugCoin to the recipient (value arg is ignored)
• giveHugTo(string name, address _to) — mints 1 HugCoin AND permanently records the recipient's name in a Member[] array on-chain
• hugged(uint256) — retrieves a hug record: {member: address, name: string, memberSince: timestamp}
• totalHuggers() — total number of unique addresses ever hugged
• destroy() — owner-only selfdestruct
• The constructor sent the first hug to Jon Romero himself: giveHugTo("Jon V", deployer)

The contract was deployed as version "0.2" of the concept — two earlier iterations (0xb723... and 0x84da...) were deployed and destroyed at blocks 2,104,929 and 2,104,949 before this final version.

Function Selectors

Selector	Function
06fdde03	name()
33af4b59	totalHuggers()
70a08231	balanceOf(address)
797b0f84	giveHugTo(string,address)
83197ef0	destroy()
95d89b41	symbol()
a9059cbb	transfer(address,uint256)
bf8161de	hugged(uint256)

Constructor Arguments

The constructor accepts a string sym parameter, which overrides the default symbol '<3'. The deployer passed "🤗" (hugging face emoji), making the on-chain symbol the 🤗 emoji.

ABI-encoded constructor arg (96 bytes):

0000000000000000000000000000000000000000000000000000000000000020  // offset
0000000000000000000000000000000000000000000000000000000000000004  // length: 4 bytes
f09fa49700000000000000000000000000000000000000000000000000000000  // 🤗 (U+1F917, UTF-8: f0 9f a4 97)