pyethereum block decode example

pyeth-block-decode.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "# mkdir pyeth\n",
    "# cd pyeth\n",
    "# pipenv --two\n",
    "# pipenv install git+https://github.com/ethereum/pyethereum@develop#egg=ethereum\n",
    "# pipenv install jupyter\n",
    "# pipenv shell\n",
    "# jupyter notebook"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import ethereum"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "from ethereum.block import Block\n",
    "from ethereum.block import BlockHeader\n",
    "from ethereum.utils import parse_as_bin"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import rlp"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# raw hex of block https://etherscan.io/block/3598320\n",
    "block_data = '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'"
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  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "block_bin = parse_as_bin(block_data)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "block = rlp.decode(block_bin, Block)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[('header', ethereum.block.BlockHeader),\n",
       " ('transactions', <rlp.sedes.lists.CountableList at 0x108fe8a10>),\n",
       " ('uncles', <rlp.sedes.lists.CountableList at 0x108fe8a50>)]"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "block.fields"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<BlockHeader(#3598320 575d5e6a)>"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "block.header"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[('prevhash', <rlp.sedes.binary.Binary at 0x108e22110>),\n",
       " ('uncles_hash', <rlp.sedes.binary.Binary at 0x108e22110>),\n",
       " ('coinbase', <rlp.sedes.binary.Binary at 0x108e130d0>),\n",
       " ('state_root', <rlp.sedes.binary.Binary at 0x108e22150>),\n",
       " ('tx_list_root', <rlp.sedes.binary.Binary at 0x108e22150>),\n",
       " ('receipts_root', <rlp.sedes.binary.Binary at 0x108e22150>),\n",
       " ('bloom', <rlp.sedes.big_endian_int.BigEndianInt at 0x108e220d0>),\n",
       " ('difficulty', <rlp.sedes.big_endian_int.BigEndianInt at 0x108dfc410>),\n",
       " ('number', <rlp.sedes.big_endian_int.BigEndianInt at 0x108dfc410>),\n",
       " ('gas_limit', <rlp.sedes.big_endian_int.BigEndianInt at 0x108dfc410>),\n",
       " ('gas_used', <rlp.sedes.big_endian_int.BigEndianInt at 0x108dfc410>),\n",
       " ('timestamp', <rlp.sedes.big_endian_int.BigEndianInt at 0x108dfc410>),\n",
       " ('extra_data', <rlp.sedes.binary.Binary at 0x108dfc2d0>),\n",
       " ('mixhash', <rlp.sedes.binary.Binary at 0x108dfc2d0>),\n",
       " ('nonce', <rlp.sedes.binary.Binary at 0x108dfc2d0>)]"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "block.header.fields"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'53e106c52d0239a68f1684f4872845fe57446aaef4cce908abce2fcef8ea7b45'"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "block.header.prevhash.encode('hex')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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