README

Go 420coin

Official Golang implementation of the 420coin protocol.

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Automated builds are available for stable releases and the unstable master branch. Binary archives are published at https://420integrated.com/downloads/.

Building the source on Ubuntu 16.04

sudo apt-get update sudo apt-get -y upgrade sudo curl -O https://storage.googleapis.com/golang/go1.8.3.linux-amd64.tar.gz sudo tar -xvf go1.8.3.linux-amd64.tar.gz sudo mv go /usr/local nano ~/.profile

Add export PATH=$PATH:/usr/local/go/bin to the file:

source ~/.profile git clone https://github.com/420integrated/go-420coin.git sudo apt-get install -y build-essential cd go-420coin make g420 ./build/bin/g420 account new ./build/bin/g420

For prerequisites and detailed build instructions please read the Installation Instructions on the wiki.

Building g420 requires both a Go (version 1.13 or later) and a C compiler. You can install them using your favourite package manager. Once the dependencies are installed, run

make g420

or, to build the full suite of utilities:

make all

Executables

The go-420coin project comes with several wrappers/executables found in the cmd directory.

Command Description
g420 Our main 420coin CLI client. It is the entry point into the 420coin network (main-, test- or private net), capable of running as a full node (default), archive node (retaining all historical state) or a light node (retrieving data live). It can be used by other processes as a gateway into the 420coin network via JSON RPC endpoints exposed on top of HTTP, WebSocket and/or IPC transports. g420 --help and the CLI Wiki page for command line options.
abigen Source code generator to convert 420coin contract definitions into easy to use, compile-time type-safe Go packages. It operates on plain 420coin contract ABIs with expanded functionality if the contract bytecode is also available. However, it also accepts Solidity source files, making development much more streamlined. Please see our Native DApps wiki page for details.
bootnode Stripped down version of our 420coin client implementation that only takes part in the network node discovery protocol, but does not run any of the higher level application protocols. It can be used as a lightweight bootstrap node to aid in finding peers in private networks.
evm Developer utility version of the EVM (420coin Virtual Machine) that is capable of running bytecode snippets within a configurable environment and execution mode. Its purpose is to allow isolated, fine-grained debugging of EVM opcodes (e.g. evm --code 60ff60ff --debug run).
g420rpctest Developer utility tool to support our 420coin/rpc-test test suite which validates baseline conformity to the 420coin JSON RPC specs. Please see the test suite's readme for details.
rlpdump Developer utility tool to convert binary RLP (Recursive Length Prefix) dumps (data encoding used by the 420coin protocol both network as well as consensus wise) to user-friendlier hierarchical representation (e.g. rlpdump --hex CE0183FFFFFFC4C304050583616263).
puppeth a CLI wizard that aids in creating a new 420coin network.

Running g420

Going through all the possible command line flags is out of scope here (please consult our CLI Wiki page), but we've enumerated a few common parameter combos to get you up to speed quickly on how you can run your own g420 instance.

Full node on the main 420coin network

By far the most common scenario is people wanting to simply interact with the 420coin network: create accounts; transfer funds; deploy and interact with contracts. For this particular use-case the user doesn't care about years-old historical data, so we can fast-sync quickly to the current state of the network. To do so:

$ g420 console

This command will:

  • Start g420 in fast sync mode (default, can be changed with the --syncmode flag), causing it to download more data in exchange for avoiding processing the entire history of the 420coin network, which is very CPU intensive.
  • Start up g420's built-in interactive JavaScript console, (via the trailing console subcommand) through which you can invoke all official web3 methods as well as g420's own management APIs. This tool is optional and if you leave it out you can always attach to an already running g420 instance with g420 attach.

Configuration

As an alternative to passing the numerous flags to the g420 binary, you can also pass a configuration file via:

$ g420 --config /path/to/your_config.toml

To get an idea how the file should look like you can use the dumpconfig subcommand to export your existing configuration:

$ g420 --your-favourite-flags dumpconfig

Note: This works only with g420 v1.6.0 and above.

Programmatically interfacing g420 nodes

As a developer, sooner rather than later you'll want to start interacting with g420 and the 420coin network via your own programs and not manually through the console. To aid this, g420 has built-in support for a JSON-RPC based APIs (standard APIs such as JSON-RPC and g420 specific APIs such as Management-APIs). These can be exposed via HTTP, WebSockets and IPC (UNIX sockets on UNIX based platforms, and named pipes on Windows).

The IPC interface is enabled by default and exposes all the APIs supported by g420, whereas the HTTP and WS interfaces need to manually be enabled and only expose a subset of APIs due to security reasons. These can be turned on/off and configured as you'd expect.

HTTP based JSON-RPC API options:

  • --http Enable the HTTP-RPC server
  • --http.addr HTTP-RPC server listening interface (default: localhost)
  • --http.port HTTP-RPC server listening port (default: 6174)
  • --http.api API's offered over the HTTP-RPC interface (default: 420,net,web3)
  • --http.corsdomain Comma separated list of domains from which to accept cross origin requests (browser enforced)
  • --ws Enable the WS-RPC server
  • --ws.addr WS-RPC server listening interface (default: localhost)
  • --ws.port WS-RPC server listening port (default: 8546)
  • --ws.api API's offered over the WS-RPC interface (default: 420,net,web3)
  • --ws.origins Origins from which to accept websockets requests
  • --ipcdisable Disable the IPC-RPC server
  • --ipcapi API's offered over the IPC-RPC interface (default: admin,debug,420,miner,net,personal,shh,txpool,web3)
  • --ipcpath Filename for IPC socket/pipe within the datadir (explicit paths escape it)

You'll need to use your own programming environments' capabilities (libraries, tools, etc) to connect via HTTP, WS or IPC to a g420 node configured with the above flags and you'll need to speak JSON-RPC on all transports. You can reuse the same connection for multiple requests!

Note: Please understand the security implications of opening up an HTTP/WS based transport before doing so! Hackers on the internet are actively trying to subvert 420coin nodes with exposed APIs! Further, all browser tabs can access locally running web servers, so malicious web pages could try to subvert locally available APIs!

Operating a private network

Maintaining your own private network is more involved as a lot of configurations taken for granted in the official networks need to be manually set up.

Defining the private genesis state

First, you'll need to create the genesis state of your networks, which all nodes need to be aware of and agree upon. This consists of a small JSON file (e.g. call it genesis.json):

{
  "config": {
    "chainId": <arbitrary positive integer>,
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0
  },
  "alloc": {},
  "coinbase": "0x0000000000000000000000000000000000000000",
  "difficulty": "0x20000",
  "extraData": "",
  "smokeLimit": "0x2fefd8",
  "nonce": "0x0000000000000042",
  "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "timestamp": "0x00"
}

The above fields should be fine for most purposes, although we'd recommend changing the nonce to some random value so you prevent unknown remote nodes from being able to connect to you. If you'd like to pre-fund some accounts for easier testing, create the accounts and populate the alloc field with their addresses.

"alloc": {
  "0x0000000000000000000000000000000000000001": {
    "balance": "111111111"
  },
  "0x0000000000000000000000000000000000000002": {
    "balance": "222222222"
  }
}

With the genesis state defined in the above JSON file, you'll need to initialize every g420 node with it prior to starting it up to ensure all blockchain parameters are correctly set:

$ g420 init path/to/genesis.json
Creating the rendezvous point

With all nodes that you want to run initialized to the desired genesis state, you'll need to start a bootstrap node that others can use to find each other in your network and/or over the internet. The clean way is to configure and run a dedicated bootnode:

$ bootnode --genkey=boot.key
$ bootnode --nodekey=boot.key

With the bootnode online, it will display an enode URL that other nodes can use to connect to it and exchange peer information. Make sure to replace the displayed IP address information (most probably [::]) with your externally accessible IP to get the actual enode URL.

Note: You could also use a full-fledged g420 node as a bootnode, but it's the less recommended way.

Starting up your member nodes

With the bootnode operational and externally reachable (you can try telnet <ip> <port> to ensure it's indeed reachable), start every subsequent g420 node pointed to the bootnode for peer discovery via the --bootnodes flag. It will probably also be desirable to keep the data directory of your private network separated, so do also specify a custom --datadir flag.

$ g420 --datadir=path/to/custom/data/folder --bootnodes=<bootnode-enode-url-from-above>

Note: Since your network will be completely cut off from the main and test networks, you'll also need to configure a miner to process transactions and create new blocks for you.

Running a private miner

Mining on the public 420coin network is a complex task as it's only feasible using GPUs, requiring an OpenCL or CUDA enabled ethminer instance. For information on such a setup, please consult the Mining 420coin page on the 420integrated website.

In a private network setting, however a single CPU miner instance is more than enough for practical purposes as it can produce a stable stream of blocks at the correct intervals without needing heavy resources (consider running on a single thread, no need for multiple ones either). To start a g420 instance for mining, run it with all your usual flags, extended by:

$ g420 <usual-flags> --mine --miner.threads=1 --fourtwentycoinbase=0x0000000000000000000000000000000000000000

Which will start mining blocks and transactions on a single CPU thread, crediting all proceedings to the account specified by --fourtwentycoinbase. You can further tune the mining by changing the default smoke limit blocks converge to (--targetsmokelimit) and the price transactions are accepted at (--smokeprice).

Contribution

Thank you for considering to help out with the source code! We welcome contributions from anyone on the internet, and are grateful for even the smallest of fixes!

If you'd like to contribute to go-420coin, please fork, fix, commit and send a pull request for the maintainers to review and merge into the main code base. If you wish to submit more complex changes though, please check up with the core devs first on our gitter channel to ensure those changes are in line with the general philosophy of the project and/or get some early feedback which can make both your efforts much lighter as well as our review and merge procedures quick and simple.

Please make sure your contributions adhere to our coding guidelines:

  • Code must adhere to the official Go formatting guidelines (i.e. uses gofmt).
  • Code must be documented adhering to the official Go commentary guidelines.
  • Pull requests need to be based on and opened against the master branch.
  • Commit messages should be prefixed with the package(s) they modify.
    • E.g. "420, rpc: make trace configs optional"

Please see the Developers' Guide for more details on configuring your environment, managing project dependencies, and testing procedures.

License

The go-420coin library (i.e. all code outside of the cmd directory) is licensed under the GNU Lesser General Public License v3.0, also included in our repository in the COPYING.LESSER file.

The go-420coin binaries (i.e. all code inside of the cmd directory) is licensed under the GNU General Public License v3.0, also included in our repository in the COPYING file.

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Documentation

Overview

    Package fourtwentycoin defines interfaces for interacting with the 420coin network.

    Index

    Constants

    This section is empty.

    Variables

    View Source
    var NotFound = errors.New("not found")

      NotFound is returned by API methods if the requested item does not exist.

      Functions

      This section is empty.

      Types

      type CallMsg

      type CallMsg struct {
      	From       common.Address  // the sender of the 'transaction'
      	To         *common.Address // the destination contract (nil for contract creation)
      	Smoke      uint64          // if 0, the call executes with near-infinite smoke
      	SmokePrice *big.Int        // marleys <-> smoke exchange ratio
      	Value      *big.Int        // amount in marleys sent along with the call
      	Data       []byte          // input data, usually an ABI-encoded contract method invocation
      }

        CallMsg contains parameters for contract calls.

        type ChainReader

        type ChainReader interface {
        	BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error)
        	BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error)
        	HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error)
        	HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error)
        	TransactionCount(ctx context.Context, blockHash common.Hash) (uint, error)
        	TransactionInBlock(ctx context.Context, blockHash common.Hash, index uint) (*types.Transaction, error)
        
        	// This method subscribes to notifications about changes of the head block of
        	// the canonical chain.
        	SubscribeNewHead(ctx context.Context, ch chan<- *types.Header) (Subscription, error)
        }

          ChainReader provides access to the blockchain. The methods in this interface access raw data from either the canonical chain (when requesting by block number) or any blockchain fork that was previously downloaded and processed by the node. The block number argument can be nil to select the latest canonical block. Reading block headers should be preferred over full blocks whenever possible.

          The returned error is NotFound if the requested item does not exist.

          type ChainStateReader

          type ChainStateReader interface {
          	BalanceAt(ctx context.Context, account common.Address, blockNumber *big.Int) (*big.Int, error)
          	StorageAt(ctx context.Context, account common.Address, key common.Hash, blockNumber *big.Int) ([]byte, error)
          	CodeAt(ctx context.Context, account common.Address, blockNumber *big.Int) ([]byte, error)
          	NonceAt(ctx context.Context, account common.Address, blockNumber *big.Int) (uint64, error)
          }

            ChainStateReader wraps access to the state trie of the canonical blockchain. Note that implementations of the interface may be unable to return state values for old blocks. In many cases, using CallContract can be preferable to reading raw contract storage.

            type ChainSyncReader

            type ChainSyncReader interface {
            	SyncProgress(ctx context.Context) (*SyncProgress, error)
            }

              ChainSyncReader wraps access to the node's current sync status. If there's no sync currently running, it returns nil.

              type ContractCaller

              type ContractCaller interface {
              	CallContract(ctx context.Context, call CallMsg, blockNumber *big.Int) ([]byte, error)
              }

                A ContractCaller provides contract calls, essentially transactions that are executed by the EVM but not mined into the blockchain. ContractCall is a low-level method to execute such calls. For applications which are structured around specific contracts, the abigen tool provides a nicer, properly typed way to perform calls.

                type FilterQuery

                type FilterQuery struct {
                	BlockHash *common.Hash     // used by fourtwenty_getLogs, return logs only from block with this hash
                	FromBlock *big.Int         // beginning of the queried range, nil means genesis block
                	ToBlock   *big.Int         // end of the range, nil means latest block
                	Addresses []common.Address // restricts matches to events created by specific contracts
                
                	// The Topic list restricts matches to particular event topics. Each event has a list
                	// of topics. Topics matches a prefix of that list. An empty element slice matches any
                	// topic. Non-empty elements represent an alternative that matches any of the
                	// contained topics.
                	//
                	// Examples:
                	// {} or nil          matches any topic list
                	// {{A}}              matches topic A in first position
                	// {{}, {B}}          matches any topic in first position AND B in second position
                	// {{A}, {B}}         matches topic A in first position AND B in second position
                	// {{A, B}, {C, D}}   matches topic (A OR B) in first position AND (C OR D) in second position
                	Topics [][]common.Hash
                }

                  FilterQuery contains options for contract log filtering.

                  type LogFilterer

                  type LogFilterer interface {
                  	FilterLogs(ctx context.Context, q FilterQuery) ([]types.Log, error)
                  	SubscribeFilterLogs(ctx context.Context, q FilterQuery, ch chan<- types.Log) (Subscription, error)
                  }

                    LogFilterer provides access to contract log events using a one-off query or continuous event subscription.

                    Logs received through a streaming query subscription may have Removed set to true, indicating that the log was reverted due to a chain reorganisation.

                    type PendingContractCaller

                    type PendingContractCaller interface {
                    	PendingCallContract(ctx context.Context, call CallMsg) ([]byte, error)
                    }

                      PendingContractCaller can be used to perform calls against the pending state.

                      type PendingStateEventer

                      type PendingStateEventer interface {
                      	SubscribePendingTransactions(ctx context.Context, ch chan<- *types.Transaction) (Subscription, error)
                      }

                        A PendingStateEventer provides access to real time notifications about changes to the pending state.

                        type PendingStateReader

                        type PendingStateReader interface {
                        	PendingBalanceAt(ctx context.Context, account common.Address) (*big.Int, error)
                        	PendingStorageAt(ctx context.Context, account common.Address, key common.Hash) ([]byte, error)
                        	PendingCodeAt(ctx context.Context, account common.Address) ([]byte, error)
                        	PendingNonceAt(ctx context.Context, account common.Address) (uint64, error)
                        	PendingTransactionCount(ctx context.Context) (uint, error)
                        }

                          A PendingStateReader provides access to the pending state, which is the result of all known executable transactions which have not yet been included in the blockchain. It is commonly used to display the result of ’unconfirmed’ actions (e.g. wallet value transfers) initiated by the user. The PendingNonceAt operation is a good way to retrieve the next available transaction nonce for a specific account.

                          type SmokeEstimator

                          type SmokeEstimator interface {
                          	EstimateSmoke(ctx context.Context, call CallMsg) (uint64, error)
                          }

                            SmokeEstimator wraps EstimateSmoke, which tries to estimate the smoke needed to execute a specific transaction based on the pending state. There is no guarantee that this is the true smoke limit requirement as other transactions may be added or removed by miners, but it should provide a basis for setting a reasonable default.

                            type SmokePricer

                            type SmokePricer interface {
                            	SuggestSmokePrice(ctx context.Context) (*big.Int, error)
                            }

                              SmokePricer wraps the smoke price oracle, which monitors the blockchain to determine the optimal smoke price given current fee market conditions.

                              type Subscription

                              type Subscription interface {
                              	// Unsubscribe cancels the sending of events to the data channel
                              	// and closes the error channel.
                              	Unsubscribe()
                              	// Err returns the subscription error channel. The error channel receives
                              	// a value if there is an issue with the subscription (e.g. the network connection
                              	// delivering the events has been closed). Only one value will ever be sent.
                              	// The error channel is closed by Unsubscribe.
                              	Err() <-chan error
                              }

                                Subscription represents an event subscription where events are delivered on a data channel.

                                type SyncProgress

                                type SyncProgress struct {
                                	StartingBlock uint64 // Block number where sync began
                                	CurrentBlock  uint64 // Current block number where sync is at
                                	HighestBlock  uint64 // Highest alleged block number in the chain
                                	PulledStates  uint64 // Number of state trie entries already downloaded
                                	KnownStates   uint64 // Total number of state trie entries known about
                                }

                                  SyncProgress gives progress indications when the node is synchronising with the 420coin network.

                                  type TransactionReader

                                  type TransactionReader interface {
                                  	// TransactionByHash checks the pool of pending transactions in addition to the
                                  	// blockchain. The isPending return value indicates if the transaction has been
                                  	// mined yet. Note that the transaction may not be part of the canonical chain even if
                                  	// it's not pending.
                                  	TransactionByHash(ctx context.Context, txHash common.Hash) (tx *types.Transaction, isPending bool, err error)
                                  	// TransactionReceipt returns the receipt of a mined transaction. Note that the
                                  	// transaction may not be included in the current canonical chain even if a receipt
                                  	// exists.
                                  	TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error)
                                  }

                                    TransactionReader provides access to past transactions and their receipts. Implementations may impose arbitrary restrictions on the transactions and receipts that can be retrieved. Historic transactions may not be available.

                                    Avoid relying on this interface if possible. Contract logs (through the LogFilterer interface) are more reliable and usually safer in the presence of chain reorganisations.

                                    The returned error is NotFound if the requested item does not exist.

                                    type TransactionSender

                                    type TransactionSender interface {
                                    	SendTransaction(ctx context.Context, tx *types.Transaction) error
                                    }

                                      TransactionSender wraps transaction sending. The SendTransaction method injects a signed transaction into the pending transaction pool for execution. If the transaction was a contract creation, the TransactionReceipt method can be used to retrieve the contract address after the transaction has been mined.

                                      The transaction must be signed and have a valid nonce to be included. Consumers of the API can use package accounts to maintain local private keys and need can retrieve the next available nonce using PendingNonceAt.

                                      Source Files

                                      Directories

                                      Path Synopsis
                                      420
                                      Package fourtwenty implements the 420coin protocol.
                                      Package fourtwenty implements the 420coin protocol.
                                      downloader
                                      Package downloader contains the manual full chain synchronisation.
                                      Package downloader contains the manual full chain synchronisation.
                                      fetcher
                                      Package fetcher contains the announcement based header, blocks or transaction synchronisation.
                                      Package fetcher contains the announcement based header, blocks or transaction synchronisation.
                                      filters
                                      Package filters implements an 420coin filtering system for block, transactions and log events.
                                      Package filters implements an 420coin filtering system for block, transactions and log events.
                                      tracers
                                      Package tracers is a collection of JavaScript transaction tracers.
                                      Package tracers is a collection of JavaScript transaction tracers.
                                      Package 420client provides a client for the 420coin RPC API.
                                      Package 420client provides a client for the 420coin RPC API.
                                      Package fourtwentydb defines the interfaces for an 420coin data store.
                                      Package fourtwentydb defines the interfaces for an 420coin data store.
                                      leveldb
                                      Package leveldb implements the key-value database layer based on LevelDB.
                                      Package leveldb implements the key-value database layer based on LevelDB.
                                      memorydb
                                      Package memorydb implements the key-value database layer based on memory maps.
                                      Package memorydb implements the key-value database layer based on memory maps.
                                      Package 420stats implements the network stats reporting service.
                                      Package 420stats implements the network stats reporting service.
                                      Package accounts implements high level 420coin account management.
                                      Package accounts implements high level 420coin account management.
                                      abi
                                      Package abi implements the 420coin ABI (Application Binary Interface).
                                      Package abi implements the 420coin ABI (Application Binary Interface).
                                      abi/bind
                                      Package bind generates 420coin contract Go bindings.
                                      Package bind generates 420coin contract Go bindings.
                                      keystore
                                      Package keystore implements encrypted storage of secp256k1 private keys.
                                      Package keystore implements encrypted storage of secp256k1 private keys.
                                      usbwallet
                                      Package usbwallet implements support for USB hardware wallets.
                                      Package usbwallet implements support for USB hardware wallets.
                                      usbwallet/trezor
                                      Package trezor contains the wire protocol.
                                      Package trezor contains the wire protocol.
                                      cmd
                                      bootnode
                                      bootnode runs a bootstrap node for the 420coin Discovery Protocol.
                                      bootnode runs a bootstrap node for the 420coin Discovery Protocol.
                                      checkpoint-admin
                                      checkpoint-admin is a utility that can be used to query checkpoint information and register stable checkpoints into an oracle contract.
                                      checkpoint-admin is a utility that can be used to query checkpoint information and register stable checkpoints into an oracle contract.
                                      evm
                                      evm executes EVM code snippets.
                                      evm executes EVM code snippets.
                                      faucet
                                      faucet is a 420coin faucet backed by a light client.
                                      faucet is a 420coin faucet backed by a light client.
                                      p2psim
                                      p2psim provides a command-line client for a simulation HTTP API.
                                      p2psim provides a command-line client for a simulation HTTP API.
                                      puppeth
                                      puppeth is a command to assemble and maintain private networks.
                                      puppeth is a command to assemble and maintain private networks.
                                      rlpdump
                                      rlpdump is a pretty-printer for RLP data.
                                      rlpdump is a pretty-printer for RLP data.
                                      utils
                                      Package utils contains internal helper functions for go-420coin commands.
                                      Package utils contains internal helper functions for go-420coin commands.
                                      Package common contains various helper functions.
                                      Package common contains various helper functions.
                                      bitutil
                                      Package bitutil implements fast bitwise operations.
                                      Package bitutil implements fast bitwise operations.
                                      compiler
                                      Package compiler wraps the Solidity and Vyper compiler executables (solc; vyper).
                                      Package compiler wraps the Solidity and Vyper compiler executables (solc; vyper).
                                      hexutil
                                      Package hexutil implements hex encoding with 0x prefix.
                                      Package hexutil implements hex encoding with 0x prefix.
                                      math
                                      Package math provides integer math utilities.
                                      Package math provides integer math utilities.
                                      mclock
                                      Package mclock is a wrapper for a monotonic clock source
                                      Package mclock is a wrapper for a monotonic clock source
                                      prque
                                      Package prque implements a priority queue data structure supporting arbitrary value types and int64 priorities.
                                      Package prque implements a priority queue data structure supporting arbitrary value types and int64 priorities.
                                      Package consensus implements different 420coin consensus engines.
                                      Package consensus implements different 420coin consensus engines.
                                      clique
                                      Package clique implements the proof-of-authority consensus engine.
                                      Package clique implements the proof-of-authority consensus engine.
                                      ethash
                                      Package ethash implements the ethash proof-of-work consensus engine.
                                      Package ethash implements the ethash proof-of-work consensus engine.
                                      contracts
                                      checkpointoracle
                                      Package checkpointoracle is a an on-chain light client checkpoint oracle.
                                      Package checkpointoracle is a an on-chain light client checkpoint oracle.
                                      Package core implements the 420coin consensus protocol.
                                      Package core implements the 420coin consensus protocol.
                                      asm
                                      Provides support for dealing with EVM assembly instructions (e.g., disassembling them).
                                      Provides support for dealing with EVM assembly instructions (e.g., disassembling them).
                                      rawdb
                                      Package rawdb contains a collection of low level database accessors.
                                      Package rawdb contains a collection of low level database accessors.
                                      state
                                      Package state provides a caching layer atop the 420coin state trie.
                                      Package state provides a caching layer atop the 420coin state trie.
                                      vm/runtime
                                      Package runtime provides a basic execution model for executing EVM code.
                                      Package runtime provides a basic execution model for executing EVM code.
                                      blake2b
                                      Package blake2b implements the BLAKE2b hash algorithm defined by RFC 7693 and the extendable output function (XOF) BLAKE2Xb.
                                      Package blake2b implements the BLAKE2b hash algorithm defined by RFC 7693 and the extendable output function (XOF) BLAKE2Xb.
                                      bn256
                                      Package bn256 implements the Optimal Ate pairing over a 256-bit Barreto-Naehrig curve.
                                      Package bn256 implements the Optimal Ate pairing over a 256-bit Barreto-Naehrig curve.
                                      bn256/cloudflare
                                      Package bn256 implements a particular bilinear group at the 128-bit security level.
                                      Package bn256 implements a particular bilinear group at the 128-bit security level.
                                      bn256/google
                                      Package bn256 implements a particular bilinear group.
                                      Package bn256 implements a particular bilinear group.
                                      secp256k1
                                      Package secp256k1 wraps the bitcoin secp256k1 C library.
                                      Package secp256k1 wraps the bitcoin secp256k1 C library.
                                      Package event deals with subscriptions to real-time events.
                                      Package event deals with subscriptions to real-time events.
                                      Package graphql provides a GraphQL interface to 420coin node data.
                                      Package graphql provides a GraphQL interface to 420coin node data.
                                      les
                                      Package les implements the Light 420coin Subprotocol.
                                      Package les implements the Light 420coin Subprotocol.
                                      checkpointoracle
                                      Package checkpointoracle is a wrapper of checkpoint oracle contract with additional rules defined.
                                      Package checkpointoracle is a wrapper of checkpoint oracle contract with additional rules defined.
                                      flowcontrol
                                      Package flowcontrol implements a client side flow control mechanism
                                      Package flowcontrol implements a client side flow control mechanism
                                      Package light implements on-demand retrieval capable state and chain objects for the 420coin Light Client.
                                      Package light implements on-demand retrieval capable state and chain objects for the 420coin Light Client.
                                      Package log15 provides an opinionated, simple toolkit for best-practice logging that is both human and machine readable.
                                      Package log15 provides an opinionated, simple toolkit for best-practice logging that is both human and machine readable.
                                      Go port of Coda Hale's Metrics library <https://github.com/rcrowley/go-metrics> Coda Hale's original work: <https://github.com/codahale/metrics>
                                      Go port of Coda Hale's Metrics library <https://github.com/rcrowley/go-metrics> Coda Hale's original work: <https://github.com/codahale/metrics>
                                      exp
                                      Hook go-metrics into expvar on any /debug/metrics request, load all vars from the registry into expvar, and execute regular expvar handler
                                      Hook go-metrics into expvar on any /debug/metrics request, load all vars from the registry into expvar, and execute regular expvar handler
                                      prometheus
                                      Package prometheus exposes go-metrics into a Prometheus format.
                                      Package prometheus exposes go-metrics into a Prometheus format.
                                      Package miner implements 420coin block creation and mining.
                                      Package miner implements 420coin block creation and mining.
                                      Package node sets up multi-protocol 420coin nodes.
                                      Package node sets up multi-protocol 420coin nodes.
                                      p2p
                                      discover/v4wire
                                      Package v4wire implements the Discovery v4 Wire Protocol.
                                      Package v4wire implements the Discovery v4 Wire Protocol.
                                      discv5
                                      Package discv5 is a prototype implementation of Discvery v5.
                                      Package discv5 is a prototype implementation of Discvery v5.
                                      dnsdisc
                                      Package dnsdisc implements node discovery via DNS (EIP-1459).
                                      Package dnsdisc implements node discovery via DNS (EIP-1459).
                                      enr
                                      Package enr implements 420coin Node Records as defined in EIP-778.
                                      Package enr implements 420coin Node Records as defined in EIP-778.
                                      nat
                                      Package nat provides access to common network port mapping protocols.
                                      Package nat provides access to common network port mapping protocols.
                                      netutil
                                      Package netutil contains extensions to the net package.
                                      Package netutil contains extensions to the net package.
                                      rlpx
                                      Package rlpx implements the RLPx transport protocol.
                                      Package rlpx implements the RLPx transport protocol.
                                      simulations
                                      Package simulations simulates p2p networks.
                                      Package simulations simulates p2p networks.
                                      Package rlp implements the RLP serialization format.
                                      Package rlp implements the RLP serialization format.
                                      Package rpc implements bi-directional JSON-RPC 2.0 on multiple transports.
                                      Package rpc implements bi-directional JSON-RPC 2.0 on multiple transports.
                                      signer
                                      fourbyte
                                      Package fourbyte contains the 4byte database.
                                      Package fourbyte contains the 4byte database.
                                      rules/deps
                                      Package deps Code generated by go-bindata.
                                      Package deps Code generated by go-bindata.
                                      Package tests implements execution of 420coin JSON tests.
                                      Package tests implements execution of 420coin JSON tests.
                                      Package trie implements Merkle Patricia Tries.
                                      Package trie implements Merkle Patricia Tries.
                                      internal
                                      420api
                                      Package fourtwentyapi implements the general 420coin API functions.
                                      Package fourtwentyapi implements the general 420coin API functions.
                                      debug
                                      Package debug interfaces Go runtime debugging facilities.
                                      Package debug interfaces Go runtime debugging facilities.
                                      guide
                                      Package guide is a small test suite to ensure snippets in the dev guide work.
                                      Package guide is a small test suite to ensure snippets in the dev guide work.
                                      jsre
                                      Package jsre provides execution environment for JavaScript.
                                      Package jsre provides execution environment for JavaScript.
                                      jsre/deps
                                      Package deps Code generated by go-bindata.
                                      Package deps Code generated by go-bindata.
                                      testlog
                                      Package testlog provides a log handler for unit tests.
                                      Package testlog provides a log handler for unit tests.
                                      utesting
                                      Package utesting provides a standalone replacement for package testing.
                                      Package utesting provides a standalone replacement for package testing.
                                      web3ext
                                      package web3ext contains g420 specific web3.js extensions.
                                      package web3ext contains g420 specific web3.js extensions.