frozeman

/**
 * Base contract that all upgradeable contracts should use.
 * 
 * Contracts implementing this interface are all called using delegatecall from
 * a dispatcher. As a result, the _sizes and _dest variables are shared with the
 * dispatcher contract, which allows the called contract to update these at will.
 * 
 * _sizes is a map of function signatures to return value sizes. Due to EVM
 * limitations, these need to be populated by the target contract, so the
 * dispatcher knows how many bytes of data to return from called functions.

frozeman

This is outdated: The ERC-20 is here: ethereum/EIPs#20

Token

Methods

totalSupply

frozeman

// Open the wallet console: Menu -> Develop -> Toggle console ...
// Run the following script

_.each(Wallets.find().fetch(), function(item){
    if(item.address)
        Wallets.update(item._id, {$set: {address: item.address.toLowerCase()}}); 
});
_.each(CustomContracts.find().fetch(), function(item){
    if(item.address)
        CustomContracts.update(item._id, {$set: {address: item.address.toLowerCase()}}); 

frozeman

Mapping
bytes10 + bytes2(0) + <whatever> (bytes20) or bytes20 //
0x112233445566778899001122 0000 000000000000112233445566778899001122

MappingWithGrouping
bytes6 + <whatever> (max bytes4) or bytes4 + bytes2(0) + <whatever>  or bytes20 (max bytes20)
0x112233445566 11223344 0000 00000000000000000001122334455667788

frozeman

Block creation

Pandora and Vanguard orchestration when producing a new block.

Terminology

Orchestrator - client written in go. Its responsibility is to orchestrate the Pandora and Vanguard to verify blocks.

Pandora - modified fork of go-ethereum (geth). Responsible to create valid execution blocks. P2P is enabled to share txpool and propagate blocks. It requires symbiotic connection with the orchestrator/validator client.

Vanguard - modified fork of prysm client. Responsible to run consensus algorithm (CASPER) with add execution layer data for shard0.

frozeman

/// @dev Verifies that a hash has been signed by the given signer.
    /// @param hash Any 32 byte hash.
    /// @param signerAddress Address that should have signed the given hash.
    /// @param signature Proof that the hash has been signed by signer.
    /// @return True if the address recovered from the provided signature matches the input signer address.
    function isValidSignature(
        bytes32 hash,
        address signerAddress,
        bytes memory signature
    )

frozeman

/*
Basically "web3" comes from Mist,
but "Web3" CAN come from  the dapp.

A Dapp has 3 ways to use web3.
2. and 3. would work when in Mist and outside.
*/

// 1. simply use, web3 comes already defined

frozeman

• eth://inigomontoya.eth -> calls resolver.addr() -> shows account page with balance or something
• http://inigomontoya.eth -> calls resolver.a() -> will resolve a normal DNS ip
• bzz://inigomontoya.eth -> calls resolver.multiHash() -> will resoslve using swarm
• ipfs://inigomontoya.eth -> calls resolver.multiHash() -> will resoslve using ipfs
• inigomontoya.eth -> will default to swarm and calls resolver.multiHash() -> will resoslve using swarm

frozeman

[
  {
    "inputs": [],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "constructor"
  },
  {
    "anonymous": false,
    "inputs": [

frozeman

TODO: update web3.js examples ?

• uses BN instead of BigNumber
• added websockets and new events for these providers (web3.currentProvider.on 'connect', 'end', 'error', 'timeout')
• changed web3.eth.sendRawTransaction -> web3.eth.sendSignedTransaction
• added web3.eth.subscription
  • web3.eth.subscription('logs', {address: '0x12', topics: [], fromBlock: ''}) allows only fromBlock, use web3.eth.getPastLogs for a specifc range of past blocks.
  • subscriptions return events like:
    • for "logs": "error", "log", "deleted/reverted"
    • for syncing: "error", "started", "processing", "ended"