ethers

library itmap {
    struct entry {
        // Equal to the index of the key of this item in keys, plus 1.
        uint keyIndex;
        uint value;
    }

    struct itmap {
        mapping(uint => entry) data;
        uint[] keys;

ethers

/*
In Ethereum, a contract can be written so that it returns a value for eth_call.
A Dapp can then check for success or error value of eth_call, before calling eth_sendTransaction,
to take advantage of eth_call effectively being a "preview" of the code flow that the transaction
will take.  In traditional client-server, clients can't ask servers beforehand what's going to
happen when the client makes a call; with Dapps contracts can be written so that clients can ask
for a "preview" of what is going to happen, before any funds/ethers are actually utilized
(eth_call does not cost any ethers).

Note: it is possible that in between eth_call and when eth_sendTransaction is actually mined,

ethers

pyepm -a 29d33c02a200937995e632c4597b4dca8e503978 testBulkDeploy.yaml
PyEPM 0.9.6
=====
Deploying testBulkDeploy.yaml...
Loading testBulkDeploy.yaml...
Parsing testBulkDeploy.yaml...
deploy: 
    Deploying btcBulkStoreHeaders.py...
      Contract will be available at 0xb8e116ddf8b8d451e04c5733a96a853b9036e883
Waiting for transaction... took 3s

ethers

pyepm -a 29d33c02a200937995e632c4597b4dca8e503978 testBulkDeploy.yaml
PyEPM 0.9.5-2-g13e13e7-dirty
=====
Deploying testBulkDeploy.yaml...
Loading testBulkDeploy.yaml...
Parsing testBulkDeploy.yaml...
deploy: 
    Deploying btcBulkStoreHeaders.py...
      Contract will be available at 0xcf2d91e4a42568344d6222f08003db3104f3cddd
Waiting for transaction.. took 2s

ethers

pyepm -a f52a423ecad0b6c70b5adf69edbe51b9db11c7c9 testBulkDeploy.yaml    
PyEPM 0.9.6
=====
Deploying testBulkDeploy.yaml...
Loading testBulkDeploy.yaml...
Parsing testBulkDeploy.yaml...
deploy: 
    Deploying btcBulkStoreHeaders.py...
      Contract will be available at 0x6da764a088e1d16610f38b305eb4f320f1cb227c
Waiting for transaction.

ethers

pyepm -a 9409fe90e19bc99a9316e9f80bb3ede98cffac75 testBulkDeploy.yaml 
PyEPM 0.9.6-2-ga67094c
=====
Deploying testBulkDeploy.yaml...
Loading testBulkDeploy.yaml...
Parsing testBulkDeploy.yaml...
deploy: 
    Deploying btcBulkStoreHeaders.py...
      Contract will be available at 0xdc6b46483528c59c7354f3f84e27e79f41ad1e55
Waiting for transaction............................................. took 45s

ethers

# Found from https://snipt.net/akaihola/move-untracked-files-outside-a-git-repository/

git ls-files --others --exclude-standard -z | cpio -pmd0 ../untracked/
# git clean -d -f

# git ls-files: print a
# * null-delimited (-z) list of 
# * untracked (--others)
# * non-ignored (--exclude-standard) files.
# cpio:

ethers

byte = range(32)

def flipBytes(n):
    numByte = 32
    mask = 0xff
    i = 0
    while i < numByte:
        b = n & mask
        b /= 2 ** (i*8)
        b *= 2 ** ((numByte-i-1)*8)

ethers

data byte[32]

def flipBytes(n):
    numByte = 5
    mask = 0xff
    i = 0
    while i < numByte:
        b = n & mask
        b /= 2^(i*8)
        b *= 2^((numByte-i-1)*8)

ethers

storageTrie.get(key, function(err, found) {
            if (found || (!found && val.toString('hex') === '00')) {
              gasLeft = gasLeft.add(100);
            } else if (!found && val.toString('hex') !== '00') {
              gasLeft = gasLeft.sub(100);
            } else if (found && val.toString('hex') === '00') {
              gasLeft = gasLeft.add(200);
            }

            if (val.toString('hex') === '00') {