Ethereum for Ruby

A straightforward library to build, sign, and broadcast Ethereum transactions. It allows the separation of key and node management. Sign transactions and handle keys anywhere you can run Ruby and broadcast transactions through any local or remote node. Sign messages and recover signatures for authentication.

What you get:

• Secp256k1 Key-Pairs and Encrypted Ethereum Key-Stores (JSON)
• EIP-55 Checksummed Ethereum Addresses
• EIP-155 Replay protection with Chain IDs (with presets)
• EIP-191 Ethereum Signed Messages (with prefix and type)
• EIP-712 Ethereum Signed Type Data
• EIP-1271 Smart-Contract Authentification
• EIP-1559 Ethereum Type-2 Transactions (with priority fee and max gas fee)
• EIP-2028 Call-data intrinsic gas cost estimates (plus access lists)
• EIP-2718 Ethereum Transaction Envelopes (and types)
• EIP-2930 Ethereum Type-1 Transactions (with access lists)
• ABI-Encoder and Decoder (including type parser)
• RLP-Encoder and Decoder (including sedes)
• RPC-Client (IPC/HTTP) for Execution-Layer APIs
• Solidity bindings (compile contracts from Ruby)
• Full smart-contract support (deploy, transact, and call)

Contents:

• 1. Installation
• 2. Usage
  • 2.1. Ethereum Keys and Addresses (EIP-55)
  • 2.2. Ethereum Signatures (EIP-191, EIP-712)
  • 2.3. Ethereum Chains (EIP-155)
  • 2.4. Ethereum Transactions (EIP-1559, EIP-2718, EIP-2930)
  • 2.5. Ethereum ABI Encoder and Decoder
  • 2.6. Ethereum RLP Encoder and Decoder
  • 2.7. Ethereum RPC-Client
  • 2.8. Solidity Compiler Bindings
  • 2.9. Interact with Smart Contract
• 3. Documentation
• 4. Testing
• 5. Contributing
• 6. License and Credits

1. Installation

Add this line to your application's Gemfile:

gem "eth"

Or install it yourself as:

gem install eth

2. Usage

Check out and for full details.

2.1. Ethereum Keys and Addresses (EIP-55)

Generate a random Secp256k1 key-pair.

key = Eth::Key.new
# => #<Eth::Key:0x00005574a6ba80b8 @private_key=#<Secp256k1::PrivateKey:0x00005574a6b9a0a8 @data=")&\x86P\xB5\x16\xD9]\xFA;\x1F\xF6\xD9\xCF\xE3Vj/\xE2\x81\xC0\x9D\xE9\x05o!q\x82G\x9A\x10Q">, @public_key=#<Secp256k1::PublicKey:0x00005574a6b9bf98>>

Create an password-encrypted Ethereum key-store.

my_key = Eth::Key.new priv: "30137644b564785d01420f8043f043d74dcca64008e57c59f8ce713a0005a54b"
key_store = Eth::Key::Encrypter.perform my_key, "secret-password-1337"
# => "{\"crypto\":{\"cipher\":\"aes-128-ctr\",\"cipherparams\":{\"iv\":\"7e5c0fe1e27f4ea61b0f4427dd63555f\"},\"ciphertext\":\"6353653bba494cdae6bcd510febc980cdc6f7b23cfbdf950d7a909a69625c8fd\",\"kdf\":\"pbkdf2\",\"kdfparams\":{\"c\":262144,\"dklen\":32,\"prf\":\"hmac-sha256\",\"salt\":\"cce96286f3c32267fc91f756365307fe6a4c83b6b2a73c69535f721fa407736c\"},\"mac\":\"3361ffd2b158a1d7bca5a5fd86a251ba3e9d80b602c867a2e0f47023a0e17a57\"},\"id\":\"642ee9fc-72e4-4d0a-902f-247c0b59bfda\",\"version\":3}"
restored_key = Eth::Key::Decrypter.perform key_store, "secret-password-1337"
# => "30137644b564785d01420f8043f043d74dcca64008e57c59f8ce713a0005a54b"

Manage Ethereum address objects adhering to EIP-55 checksum format.

address = Eth::Address.new "0xd496b23d61f88a8c7758fca7560dcfac7b3b01f9"
# => #<Eth::Address:0x00005574a6bd4fc8 @address="0xd496b23d61f88a8c7758fca7560dcfac7b3b01f9">
address.valid?
# => true
address.checksummed # EIP 55
# => "0xD496b23D61F88A8C7758fca7560dCFac7b3b01F9"

See /spec or Documentation for more details about key-pairs, encrypting/decrypting key-stores with a secret, and checksummed addresses.

2.2. Ethereum Signatures (EIP-191, EIP-712)

Manage keypairs to sign messages in EIP-191 (personal_sign) format or typed data in EIP-712 (sign_typed_data) format.

key = Eth::Key.new priv: "268be6f4a68c40f6862b7ac9aed8f701dc25a95ddb9a44d8b1f520b75f440a9a"
# => #<Eth::Key:0x00005574a699adc0 @private_key=#<Secp256k1::PrivateKey:0x00005574a6998200 @data="&\x8B\xE6\xF4\xA6\x8C@\xF6\x86+z\xC9\xAE\xD8\xF7\x01\xDC%\xA9]\xDB\x9AD\xD8\xB1\xF5 \xB7_D\n\x9A">, @public_key=#<Secp256k1::PublicKey:0x00005574a6998160>>
key.public_hex
# => "04b45200621c013a5fbab999ac33b0c836328a04afa0255ffbe6ea0f6fd97e187b02199886d942a9f50f7e279a2bc74c93b2afcbd7255489939f9b36a5eae5e281"
key.address.to_s
# => "0xD496b23D61F88A8C7758fca7560dCFac7b3b01F9"
key.personal_sign "Hello World!"
# => "ac6a59417d8688c8144f01a662384fa691636b48a071d4b7c13902bb87ca472b0bce1d7a758f39a5759ed5e937ce61f50dd1b83158371f8d0faeb9b7d81c194225"

Recover and verify personal signatures respecting EIPs 155, 191, and 712.

address = Eth::Address.new "0xd496b23d61f88a8c7758fca7560dcfac7b3b01f9"
# => #<Eth::Address:0x00005574a6bd4fc8 @address="0xd496b23d61f88a8c7758fca7560dcfac7b3b01f9">
signature = "ac6a59417d8688c8144f01a662384fa691636b48a071d4b7c13902bb87ca472b0bce1d7a758f39a5759ed5e937ce61f50dd1b83158371f8d0faeb9b7d81c19422d"
# => "ac6a59417d8688c8144f01a662384fa691636b48a071d4b7c13902bb87ca472b0bce1d7a758f39a5759ed5e937ce61f50dd1b83158371f8d0faeb9b7d81c19422d"
recovered_key = Eth::Signature.personal_recover "Hello World!", signature, Eth::Chain::GOERLI
# => "04b45200621c013a5fbab999ac33b0c836328a04afa0255ffbe6ea0f6fd97e187b02199886d942a9f50f7e279a2bc74c93b2afcbd7255489939f9b36a5eae5e281"
Eth::Util.public_key_to_address(recovered_key).to_s
# => "0xD496b23D61F88A8C7758fca7560dCFac7b3b01F9"
Eth::Signature.verify "Hello World!", signature, address, Eth::Chain::GOERLI
# => true

See /spec or Documentation for signing typed data as per EIP-712.

2.3. Ethereum Chains (EIP-155)

Manage Ethereum chain IDs for EIP-155 replay protection.

chain_id = Eth::Chain::OPTIMISM
# => 10
v = Eth::Chain.to_v 0, Eth::Chain::OPTIMISM
# => 55
recovery_id = Eth::Chain.to_recovery_id v, Eth::Chain::OPTIMISM
# => 0
chain_id = Eth::Chain.to_chain_id v
# => 10

2.4. Ethereum Transactions (EIP-1559, EIP-2718, EIP-2930)

Create an EIP-1559-conform transaction:

payload = {
  chain_id: Eth::Chain::GOERLI,
  nonce: 5,
  priority_fee: 3 * Eth::Unit::GWEI,
  max_gas_fee: 69 * Eth::Unit::GWEI,
  gas_limit: 230_420,
  to: "0xCaA29806044A08E533963b2e573C1230A2cd9a2d",
  value: 0.069423 * Eth::Unit::ETHER,
}
# => {:chain_id=>5, :nonce=>5, :priority_fee=>0.3e10, :max_gas_fee=>0.69e11, :gas_limit=>230420, :to=>"0xCaA29806044A08E533963b2e573C1230A2cd9a2d", :value=>0.69423e17}
tx = Eth::Tx.new payload
# => #<Eth::Tx::Eip1559:0x0000557e35fc5a68 @access_list=[], @amount=69423000000000000, @chain_id=5, @destination="CaA29806044A08E533963b2e573C1230A2cd9a2d", @gas_limit=230420, @max_fee_per_gas=69000000000, @max_priority_fee_per_gas=3000000000, @payload="", @sender="", @signature_r=0, @signature_s=0, @signature_y_parity=nil, @signer_nonce=5, @type=2>
my_key = Eth::Key.new priv: "30137644b564785d01420f8043f043d74dcca64008e57c59f8ce713a0005a54b"
# => #<Eth::Key:0x0000557e36243178 @private_key=#<Secp256k1::PrivateKey:0x0000557e36242d40 @data="0\x13vD\xB5dx]\x01B\x0F\x80C\xF0C\xD7M\xCC\xA6@\b\xE5|Y\xF8\xCEq:\x00\x05\xA5K">, @public_key=#<Secp256k1::PublicKey:0x0000557e36242cf0>>
tx.sign my_key
# => "cba302c0ebf8d0205a78ae97f560419b407e32e2426f416abc95a9bfc9dac09c"
tx.hex
# => "02f873050584b2d05e00851010b872008303841494caa29806044a08e533963b2e573c1230a2cd9a2d87f6a3d9c63df00080c080a03aa187d10b138d3e0155729adb961cd89e10f988ba2d19d6869770b9e5a23d10a04d40864600136ae214916043c7d63b849c98db757e95c86983a036982816e1af"

This gem also supports access lists and ABI-encoded data payloads. See /spec or Documentation for more details about the various supported transaction types (legacy, type-1, type-2), payload parameters, and how to estimate intrinsic gas costs.

2.5. Ethereum ABI Encoder and Decoder

Encode and decode Ethereum application binary interface data (ABI).

Eth::Util.bin_to_hex Eth::Abi.encode(["string", "address"], ["Hello, Bob!", "0xd496b23d61f88a8c7758fca7560dcfac7b3b01f9"])
# => "0000000000000000000000000000000000000000000000000000000000000040000000000000000000000000d496b23d61f88a8c7758fca7560dcfac7b3b01f9000000000000000000000000000000000000000000000000000000000000000b48656c6c6f2c20426f6221000000000000000000000000000000000000000000"
Eth::Abi.decode(["string", "address"], "0000000000000000000000000000000000000000000000000000000000000040000000000000000000000000d496b23d61f88a8c7758fca7560dcfac7b3b01f9000000000000000000000000000000000000000000000000000000000000000b48656c6c6f2c20426f6221000000000000000000000000000000000000000000")
# => ["Hello, Bob!", "0xd496b23d61f88a8c7758fca7560dcfac7b3b01f9"]

2.6. Ethereum RLP Encoder and Decoder

Serialize and deserialize Ethereum recursive-length prefix data (RLP).

Eth::Util.bin_to_hex Eth::Rlp.encode ["Hello, Bob!", "0xd496b23d61f88a8c7758fca7560dcfac7b3b01f9"]
# => "f78b48656c6c6f2c20426f6221aa307864343936623233643631663838613863373735386663613735363064636661633762336230316639"
Eth::Rlp.decode "f78b48656c6c6f2c20426f6221aa307864343936623233643631663838613863373735386663613735363064636661633762336230316639"
# => ["Hello, Bob!", "0xd496b23d61f88a8c7758fca7560dcfac7b3b01f9"]

Or ;-)

Eth::Rlp.decode "c7c0c1c0c3c0c1c0"
# => [[], [[]], [[], [[]]]]

2.7. Ethereum RPC-Client

Create an IPC- or HTTP-RPC-API client to seamlessly query the chain state, e.g., Infura over HTTPS with access token:

infura = Eth::Client.create "https://mainnet.infura.io/v3/#{access_token}"
# => #<Eth::Client::Http:0x000055d43f3ca460 @gas_limit=21000, @host="mainnet.infura.io", @id=0, @max_fee_per_gas=0.2e11, @max_priority_fee_per_gas=0, @port=443, @ssl=true, @uri=#<URI::HTTPS https://mainnet.infura.io/v3/31b...d93>>
deposit_contract = Eth::Address.new "0x00000000219ab540356cBB839Cbe05303d7705Fa"
# => #<Eth::Address:0x000055d43f381738 @address="0x00000000219ab540356cBB839Cbe05303d7705Fa">
infura.get_balance deposit_contract
# => 9087314000069000000000069

Or set up a local development environment with geth --dev:

cli = Eth::Client.create "/tmp/geth.ipc"
# => #<Eth::Client::Ipc:0x000055d43f51c390 @gas_limit=21000, @id=0, @max_fee_per_gas=0.2e11, @max_priority_fee_per_gas=0, @path="/tmp/geth.ipc">
cli.eth_coinbase
# => {"jsonrpc"=>"2.0", "id"=>1, "result"=>"0x6868074fb21c48dfad0c448fbabd99383a6598e4"}
tx = cli.transfer_and_wait(Eth::Key.new.address, 1337 * Eth::Unit::ETHER)
# => "0x141c6dff40df34fe4fce5a65588d2161dab3e0e977fb8049ff7d79bc901034f7"
cli.eth_get_transaction_by_hash tx
# => {"jsonrpc"=>"2.0", "id"=>8, "result"=> {"blockHash"=>"0x47e742038c75851348dbda87b15fde044d54c442c371f43bea881a44d5589de3", "blockNumber"=>"0x1", "from"=>"0x6868074fb21c48dfad0c448fbabd99383a6598e4", "gas"=>"0x5208", "gasPrice"=>"0x342770c1", "maxFeePerGas"=>"0x77359401", "maxPriorityFeePerGas"=>"0x1", "hash"=>"0x141c6dff40df34fe4fce5a65588d2161dab3e0e977fb8049ff7d79bc901034f7", "input"=>"0x", "nonce"=>"0x0", "to"=>"0x311c61e5dc6123ad016bb7fd687d283c327bcd5f", "transactionIndex"=>"0x0", "value"=>"0x487a9a304539440000", "type"=>"0x2", "accessList"=>[], "chainId"=>"0x539", "v"=>"0x0", "r"=>"0xb42477d69eae65a3a3d91d9cb173e4a45a403fb0a15fa729dbfdc9d13211d7b5", "s"=>"0x4a2f98fc2b61c2d7c907520bc8c6ebe42ea6fe1cb6824f95e4b30e9464395100"}}
cli.get_balance "0x311c61e5dc6123ad016bb7fd687d283c327bcd5f"
# => 1337000000000000000000
cli.get_nonce cli.eth_coinbase["result"]
# => 1

Check out Eth::Api for a list of supported RPC-APIs or consult the Documentation for more details.

2.8. Solidity Compiler Bindings

Link a system-level Solidity compiler (solc) to your Ruby library and compile contracts.

solc = Eth::Solidity.new
# => #<Eth::Solidity:0x000055f05040c6d0 @compiler="/usr/bin/solc">
contract = solc.compile "spec/fixtures/contracts/greeter.sol"
# => {"Greeter"=>
#   {"abi"=>
#     [{"inputs"=>[{"internalType"=>"string", "name"=>"message", "type"=>"string"}], "stateMutability"=>"nonpayable", "type"=>"constructor"},
#      {"inputs"=>[], "name"=>"greet", "outputs"=>[{"internalType"=>"string", "name"=>"", "type"=>"string"}], "stateMutability"=>"view", "type"=>"function"},
#      {"inputs"=>[], "name"=>"kill", "outputs"=>[], "stateMutability"=>"nonpayable", "type"=>"function"}],
#    "bin"=>
#     "6080604052348015...6c634300080c0033"},
#  "Mortal"=>
#   {"abi"=>[{"inputs"=>[], "stateMutability"=>"nonpayable", "type"=>"constructor"}, {"inputs"=>[], "name"=>"kill", "outputs"=>[], "stateMutability"=>"nonpayable", "type"=>"function"}],
#    "bin"=>
#     "6080604052348015...6c634300080c0033"}}

The contract["Greeter"]["bin"] could be directly used to deploy the contract as Eth::Tx payload. Check out the Documentation for more details.

2.9. Interact with Smart Contract

Create, compile, and deploy smart contracts.

contract = Eth::Contract.from_file(file: 'spec/fixtures/contracts/dummy.sol')
# => #<Eth::Contract::Dummy:0x00007fbeee936598>
cli = Eth::Client.create "/tmp/geth.ipc"
# => #<Eth::Client::Ipc:0x00007fbeee946128 @gas_limit=21000, @id=0, @max_fee_per_gas=0.2e11, @max_priority_fee_per_gas=0, @path="/tmp/geth.ipc">
address = cli.deploy_and_wait(contract)
# => "0x2f2faa160420cee087ded96bad52475147136bd8"

Transact with or call the deployed contract.

cli.transact_and_wait(contract, "set", 1234)
# => "0x49ca4c0a5729da19a1d2574de9a444a9cd3219bdad81745b54f9cf3bb83b6a06"
cli.call(contract, "get")
# => 1234

Or call an existing contract, e.g., the ENS registry:

ens_registry_abi = '[{"inputs":[{"internalType":"contract ENS","name":"_old","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"node","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"label","type":"bytes32"},{"indexed":false,"internalType":"address","name":"owner","type":"address"}],"name":"NewOwner","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"node","type":"bytes32"},{"indexed":false,"internalType":"address","name":"resolver","type":"address"}],"name":"NewResolver","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"node","type":"bytes32"},{"indexed":false,"internalType":"uint64","name":"ttl","type":"uint64"}],"name":"NewTTL","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"node","type":"bytes32"},{"indexed":false,"internalType":"address","name":"owner","type":"address"}],"name":"Transfer","type":"event"},{"constant":true,"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"old","outputs":[{"internalType":"contract ENS","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"node","type":"bytes32"}],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"node","type":"bytes32"}],"name":"recordExists","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"node","type":"bytes32"}],"name":"resolver","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"node","type":"bytes32"},{"internalType":"address","name":"owner","type":"address"}],"name":"setOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"node","type":"bytes32"},{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"resolver","type":"address"},{"internalType":"uint64","name":"ttl","type":"uint64"}],"name":"setRecord","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"node","type":"bytes32"},{"internalType":"address","name":"resolver","type":"address"}],"name":"setResolver","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"node","type":"bytes32"},{"internalType":"bytes32","name":"label","type":"bytes32"},{"internalType":"address","name":"owner","type":"address"}],"name":"setSubnodeOwner","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"node","type":"bytes32"},{"internalType":"bytes32","name":"label","type":"bytes32"},{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"resolver","type":"address"},{"internalType":"uint64","name":"ttl","type":"uint64"}],"name":"setSubnodeRecord","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"node","type":"bytes32"},{"internalType":"uint64","name":"ttl","type":"uint64"}],"name":"setTTL","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"node","type":"bytes32"}],"name":"ttl","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"payable":false,"stateMutability":"view","type":"function"}]'
ens_registry_address = "0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e"
ens_registry_name = "ENSRegistryWithFallback"
ens_registry = Eth::Contract.from_abi(name: ens_registry_name, address: ens_registry_address, abi: ens_registry_abi)
# => #<Eth::Contract::ENSRegistryWithFallback:0x000055bece570980>
ens_registry.address
# => "0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e"
cli.call(ens_registry, "old")
# => "0x112234455c3a32fd11230c42e7bccd4a84e02010"

The gem also comes with an EIP-1271 smart-contract authentification interface.

cli.is_valid_signature contract, hash, signature
# => true

3. Documentation

The documentation can be found at: https://q9f.github.io/eth.rb

For any specific version, docs can be generated by yard:

gem install bundler rdoc yard
git checkout v0.5.0
yard doc

The goal is to have 100% API documentation available.

4. Testing

The test suite expects working local HTTP and IPC endpoints with a prefunded developer account, e.g.:

geth --dev --http --ipcpath /tmp/geth.ipc &

To run tests, simply use rspec. Note, that the Ethereum test fixtures are also required.

git submodule update --init --recursive
bundle install
rspec

The goal is to have 100% specification coverage for all code inside this gem.

5. Contributing

Pull requests are welcome! To contribute, please consider the following:

• Code should be fully documented. Run yard doc and make sure it does not yield any warnings or undocumented sets.
• Code should be fully covered by tests. Run rspec to make sure all tests pass. The CI has an integration that will assis you to identify uncovered lines of code and get coverage up to 100%.
• Code should be formatted properly. Try to eliminate the most common issues such as trailing white-spaces or duplicate new-lines. Usage of the rufo gem is recommended.
• Submit pull requests, questions, or issues to Github: https://github.com/q9f/eth.rb

6. License and Credits

The eth gem is licensed under the conditions of Apache 2.0. Please see AUTHORS for contributors and copyright notices.

This gem is a complete rewrite of the old eth gem by Steve Ellis.

• https://github.com/se3000/ruby-eth/ (MIT)

It is not only a rewrite of the eth gem but also a partial merge of the ethereum gem by Marek Kirejczyk and Yuta Kurotaki.

• https://github.com/EthWorks/ethereum.rb (MIT)

This gem also includes a revised version of the ABI gem by Jan Xie and Zhang Yaning.

• https://github.com/cryptape/ruby-ethereum-abi (MIT)

It also contains a condensed version of the RLP gem by Jan Xie and Zhang Yaning.

• https://github.com/cryptape/ruby-rlp (MIT)