prestwich

Keybase proof

I hereby claim:

• I am prestwich on github.
• I am frdwrd (https://keybase.io/frdwrd) on keybase.
• I have a public key whose fingerprint is 46D3 0F12 AEF7 DB4F 306F 65DF 519E 010A 7902 8CCC

To claim this, I am signing this object:

prestwich

Verifying that +prestwich is my blockchain ID. https://onename.com/prestwich

prestwich

from riemann import simple

outpoint = simple.outpoint(tx_id, index)

# Spend a P2PKH output:
tx_ins = [simple.unsigned_input(outpoint)]

# Spend a P2SH output
tx_ins += [simple.unsigned_input(
	outpoint=outpoint,

prestwich

import riemann
from riemann.encoding import addresses

# Switch to Litecoin
riemann.select_network('litecoin_main')
addresses.make_p2pkh_address(pubkey_bytes)

# Switch to Bitcoin Cash
riemann.select_network('bitcoin_cash_main')
addresses.make_p2pkh_address(pubkey_bytes)

prestwich

from riemann.script import serialization

p2pkh_pk_script = 'OP_DUP OP_HASH160 {} OP_EQUALVERIFY OP_CHECKSIG'
script = p2pkh_script.format(pubkey_hash_hex)

stack_script = '{} {}'.format(sig_hex, pubkey_hex)
stack_script = serialization.serialize(stack_script)

prestwich

import riemann
from riemann import networks
from riemann.script import examples
from riemann.encoding import addresses

pubkey_0 = '00' * 33
pubkey_1 = '11' * 33

msig = examples.msig_two_two
msig = msig.format(pk0=pubkey_0, pk1=pubkey_1)

prestwich

# I do not recommend using pyethereum, as it is broken on windows
# I do not recommend web3.py as it sucks :)

# $ pip install eth_abi
# $ pip install pycryptodomex

import json
import eth_abi

from Cryptodome.Hash import keccak

prestwich

// This is an alpha contract designed to be proxied
// It is NOT production ready

contract Nonfungiblizer {

    bool initDone;
    address owner;
    address asset;
    uint256 value;

prestwich

import riemann
from riemann import simple, utils
from riemann.encoding import addresses as addr


riemann.select_network('zcash_sapling_main')

# Needs a 32 byte hash, alice's pubkey, a timeout, and bob's pubkey
htlc_redeem_script = (
    'OP_IF '

prestwich

What is a ScriptSig anyway?

Bitcoin legacy transactions (and Zcash transparent sends) use "ScriptSigs" to prove authorization. A ScriptSig contains the user's signature andm maybe some other information. They let the protocol check that the tx came from someone allowed to spend those Bitcoin. Most users never interact with them directly, and with the advent of SegWit, they're slowly being phased out of Bitcoin. But it's still worth knowing how they work.

Basics