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diff --git a/core/vm/contracts.go b/core/vm/contracts.go
index 6f894790f..2c533bfdd 100644
--- a/core/vm/contracts.go
+++ b/core/vm/contracts.go
@@ -36,6 +36,7 @@ import (
 	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/crypto/secp256r1"
 	"github.com/ethereum/go-ethereum/params"
+	"github.com/holiman/uint256"
 	"golang.org/x/crypto/ripemd160"

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#/bin/bash

# view a diff based on a branch that recreates the strucutre
# of actual geth

git clone git@github.com:ethereum-optimism/optimism.git
cd optimism

git checkout only-l2geth

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const bcrypto = require('bcrypto');
const random = require('bcrypto/lib/random');
const BN = require('bcrypto/lib/bn.js');
const urkel = require('urkel/radix');
//const urkel = require('urkel/trie');
const {BLAKE2b} = bcrypto;
const {randomBytes} = random;
const {Tree, Proof} = urkel;

const dir = process.cwd();

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const {NodeClient} = require('hs-client');
const sha3 = require('bcrypto/lib/sha3');
const TX = require('hsd/lib/primitives/tx');

const client = new NodeClient({
  host: '127.0.0.1',
  port: 12037
});

(async () => {

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{
  "hash": "30f4c0b5832e8a86231f04d9be0820c6df0f6da3be7ba44b0d92a0469b0c30e8",
  "witnessHash": "5cb8a7eeecc50a159516827d3f006176568859402bacca21a0ed42fd53f647f0",
  "mtime": 1589852464,
  "version": 0,
  "inputs": [
    {
      "prevout": {
        "hash": "0090099cae23b7c7b877f7391782e8fe3ba0a94c61251ad9e192506ff719b20d",

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{
  "outputs": [
    {
      "outpoint": {
        "hash": "87109e75e6b28cb2d4695fab9f2c091d894840b28aaa961528f64dc838b181c4",
        "index": 1
      },
      "output": {
        "value": 136503385487,
        "address": "hs1q9rpvmy58x6alnry6u0fy6zfd9fsq3sstcev9g0",

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-----BEGIN PGP PUBLIC KEY BLOCK-----
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#!/bin/bash

# First argument must be the path to
# the hsd gitrepo, ie ./hsd-auction $PWD/hsd

HSD_="$1/bin/hsd"
HSW_CLI="$1/bin/hsw-cli"
HSD_CLI="$1/bin/hsd-cli"

export HSD_NETWORK=regtest

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#!/bin/bash

# Run from the root of the gitrepo
# Starts hsd, can pass debug as arg to run with
# debugger.

DIR="$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
ROOTDIR=$(echo $(cd $DIR/.. && pwd))

NODE="$ROOTDIR/bin/node"

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## Output Structuring

In a UTXO-based blockchain, the typical transaction output consists of a
_locking script_, or _predicate_, combined with an output value.

A typical bitcoin output exists as a struct of:

fig. 16

``` c