Blockchain od začátečníka 3 - transakce ověřené rostoucím binárním stromem (merkle tree)

Minule jsme začali pěkně řetězit bloky a při té příležitosti jsem zmínil, že dělat blok pro každý kousek informace, každou transakci, by mohlo být hodně neefektivní (tak například - v systémech Proof of Work se na nový blok čeká klidně 10 minut a stojí to nemálo výpočetního výkonu). Bude dávat smysl dát tam záznamů víc najednou, víc transakcí. Tyto budou potenciálně přicházet z různých směrů (minule jsem kupoval auto, ale někdo jiný ve stejný čas objednává zbytkové piliny s horou lepidla a nálepkou na povrchu v IKEA). Nechme teď stranou, podle čeho budou nody transakce do bloku vybírat (necháme si na jindy, ale je to zajímavé a důležité), spíše se soustřeďme, jak toho technicky dosáhnout.

Transakce a merkle tree

V první řadě každou transakci je dobré při vytvoření podepsat, aby s ní nešlo manipulovat. To už umíme - vezmeme atributy transakce (já použil jen čas a data, ale ty se ve skutečnosti budou typicky skládat z adres, input a output) a uděláme z toho hash a té se typicky říká txid.

Transakcí můžeme chtít do bloku dát poměrně dost, typicky tisíce, ale nechceme mít nějaký limit škálovatelnosti. Ne vždy je pro všechny účastníky nutné vidět všechno - ať už z hlediska soukromí nebo čistě z důvodů efektivity (výpočetní prostředky, čas, pásmo na stažení dat). Nezapomínejme například, že kromě velkých nodů (například těžařů a těch, co za úplatek ve formě gas fee pomáhají procesovat a ověřovat transakce i bloky) jsou v síti i peněženky spotřebitelů. Chci si jen pípnout a sednout do svého nového auta, ne stahovat romány z Internetu a zuřivě počítat.

Dává tedy smysl oddělit to podstatné, tedy identifikátor a důkazy do hlavičky bloku a samotná data, tedy naše transakce, dát do nějakého body, které ne každý musí nutně chtít stahovat.

Určitě bychom tedy mohli transakce naskládat do body a z jejich hash (txid) udělat spojením všech dohromady další hash a tu uložit ve hlavičce. Tím bychom měli jistotu, že jednak každá transakce není cinknutá (txid odpovídá) a ještě navíc nikdo do bloku žádnou nepřidal, neubral nebo nezměnil.

Tohle by určitě fungovalo, ale je tu jeden problém na straně klientů, kteří nemají zájem stahovat si všechny transakce k sobě a počítat (mohou jich být tisíce na blok) a v některých speciálních případech ani nechceme, aby bylo všechno takhle běžně vidět. Jak to udělat tak, aby wallet prodejce aut mohl ověřit, že transakce, kterou se mnou uzavřel, se úspěšně zapsala do blockchain aniž by musel stáhnout data celého bloku? Toho můžeme dosáhnout s použití merkle tree. Je to v podstatě něco jako binární vyhledávací strom, ale s tím, že nám nejde o hledání, ale jen ověření.

Vezme si tedy vždy dvojici transakcí a z jejich txid uděláme hash a pokračujeme další dvojí (když zbývá lichý počet, vezmeme stejnou transakci dvakrát). Pak rozjedeme další vrstvu - dvojice a z nich uděláme další hash. Takhle postupuje ve stromu nahoru (v mém příkladě tedy vlastně doprava) až nám nakonec zbyde jen jediná hash - merkle root.

Bez merkle tree si potřebuji stáhnout všechny transakce z body, abych si ověřil, že ta moje 7d11 mezi nimi je a že výsledná hash v block headeru souhlasí - pak tomu uvěřím. V případě merkle tree mohu jako peněžnka nodu říct, že tohle je moje txid a chci po něm důkaz, že v bloku opravdu je. Bude stačit, aby mi node poslal jen ty červeně označené údaje a já na základě nich už můžu příslušnou část stromu spočítat.

Stačilo mi získat od nodu 3 údaje, nikoli 8. To samozřejmě není žádný velký rozdíl, ale je to binární strom - s každou další vrstvou se zvýší počet ověřovacích operací pouze jednu zatímco množství transakcí na dvojnásobek! Tisíce i miliony transakcí tak najednou nejsou pro peněženku žádný problém - v této škále si to ukážeme právě teď v kódu.

Implementace v Pythonu

Napsal jsem si jednoduchou implementaci v Pythonu na vyzkoušení. Oproti minule jsem třídu Block rozdělil na header a body.

import hashlib
import time
import json
from typing import List
from collections import deque

class Block:
    def __init__(self, index, previous_hash, timestamp, transactions, hash, merkle_root):
        self.header = {
            'index': index,
            'previous_hash': previous_hash,
            'timestamp': timestamp,
            'hash': hash,
            'merkle_root': merkle_root
        }
        self.body = {
            'transactions': transactions
        }

    def to_dict(self):
        return {
            'header': self.header,
            'body': {'transactions': [transaction.to_dict() for transaction in self.body['transactions']]}
        }

Dále jsem si udělal třídu Transaction a MerkleTree. Není to nic složitého. V build_merkle_tree se vytváří strom ve smyčce tak dlouho, dokud nezbyde jen jediná hash (jsme na vrcholku stromu) a pokud máme lichý počet, txid duplikujeme. Všechno ostatní jsou vlastně jen metody na vytištění výstupu a debug, které použijeme později.

class Transaction:
    def __init__(self, txid, timestamp, data ) -> None:
        self.txid = txid
        self.timestamp = timestamp
        self.data = data

    def to_dict(self):
        return {
            'txid': self.txid,
            'timestamp': self.timestamp,
            'data': self.data
        }

class MerkleTree:
    def __init__(self, transactions: List[Transaction]):
        self.transactions = transactions
        self.tree = []
        self.root = self.build_merkle_tree()

    def build_merkle_tree(self):
        # Build the Merkle tree
        self.tree = deque([transaction.txid for transaction in self.transactions])
        levels = [list(self.tree)]  # Store each level of the tree

        while len(self.tree) > 1:
            if len(self.tree) % 2 != 0:
                # Append the hash of the last transaction again
                self.tree.append(self.tree[-2])
            new_level = deque()
            for i in range(0, len(self.tree), 2):
                new_level.append(hashlib.sha256((self.tree[i] + self.tree[i + 1]).encode('utf-8')).hexdigest())
            self.tree = new_level
            levels.append(list(self.tree))  # Store the new level

        # Print the Merkle tree
        print("*** Merkle Tree ***")
        for i, level in enumerate(levels):
            print(f"Level {i}: {' '.join(hash[:6] for hash in level)}")
        print()
        
        return self.tree[0]

    def get_levels(self):
        # Build the Merkle tree
        self.tree = deque([transaction.txid for transaction in self.transactions])
        levels = [list(self.tree)]  # Store each level of the tree

        while len(self.tree) > 1:
            if len(self.tree) % 2 != 0:
                # Append the hash of the last transaction again
                self.tree.append(self.tree[-2])
            new_level = deque()
            for i in range(0, len(self.tree), 2):
                new_level.append(hashlib.sha256((self.tree[i] + self.tree[i + 1]).encode('utf-8')).hexdigest())
            self.tree = new_level
            levels.append(list(self.tree))  # Store the new level

        return levels

    def get_root_hash(self):
        return self.root

Tady jsou potřebné změny v samotné třídě Blockchain, nic zásadního.

class Blockchain:
    def __init__(self):
        # Create the genesis block with index 0 and arbitrary previous hash
        timestamp = int(time.time())
        genesis_transactions = [Transaction(hashlib.sha256(str(timestamp).encode('utf-8')).hexdigest(), timestamp, "Genesis block")]
        genesis_merkle_tree = MerkleTree(genesis_transactions)
        genesis_merkle_root = genesis_merkle_tree.get_root_hash()
        self.genesis_block = Block(0, "0", int(time.time()), genesis_transactions, self.calculate_hash(0, "0", int(time.time()), genesis_merkle_root), genesis_merkle_root)
        self.blockchain = [self.genesis_block]
        
    def calculate_hash(self, index, previous_hash, timestamp, merkle_root):
        value = str(index) + str(previous_hash) + str(timestamp) + str(merkle_root)
        return hashlib.sha256(value.encode('utf-8')).hexdigest()

    def create_new_block(self, transactions):
        # Calculate merkle tree root
        merkle_tree = MerkleTree(transactions)
        merkle_root = merkle_tree.get_root_hash()
        
        # Create the new block
        latest_block = self.get_latest_block()
        index = latest_block.header['index'] + 1
        timestamp = int(time.time())
        hash = self.calculate_hash(index, latest_block.header['hash'], timestamp, merkle_root)
        new_block = Block(index, latest_block.header['hash'], timestamp, transactions, hash, merkle_root)
        self.blockchain.append(new_block)
        return new_block

    def get_latest_block(self):
        # Get the latest block in the blockchain
        return self.blockchain[-1]

    def validate_blockchain(self):
        for i in range(1, len(self.blockchain)):
            current_block = self.blockchain[i]
            previous_block = self.blockchain[i - 1]

            # Check if the current block's hash is correct
            if current_block.header['hash'] != self.calculate_hash(current_block.header['index'], current_block.header['previous_hash'], current_block.header['timestamp'], current_block.header['merkle_root']):
                return False

            # Check if the current block's previous hash matches the hash of the previous block
            if current_block.header['previous_hash'] != previous_block.header['hash']:
                return False

            # Validate the Merkle tree
            merkle_tree = MerkleTree(current_block.body['transactions'])
            if merkle_tree.get_root_hash() != current_block.header['merkle_root']:
                return False

        return True
    
    def to_json(self):
        return json.dumps([block.to_dict() for block in self.blockchain], indent=4)

Vyzkoušejme si založit blockchain a v něm dva bloky, jeden s 8 a druhý se 7 transakcemi. Na konzoli uvidíme, jak se vytváří merkle tree a taky JSON výsledných bloků a následný výpis z ověřování. Jsme “velký node”, takže si spočítáme merkel tree z txid transakcí znova a porovnáme výsledek.

*** Merkle Tree ***
Level 0: 2f1fc8

*** Merkle Tree ***
Level 0: 574cb0 c42fbd b87ed1 3a4596 71cf1b fbe4af 17a4c1 8477d1
Level 1: 8f8093 9b5dab 42d951 dbc688
Level 2: c19934 7670a9
Level 3: 98c366

*** Merkle Tree ***
Level 0: 77fcf7 5883fe 40e837 11e4f6 f1c7ce 3b5446 c28a4a
Level 1: 08e932 0be540 7acd2d 166520
Level 2: 9faa9e a30491
Level 3: fb23e3
[
    {
        "header": {
            "index": 0,
            "previous_hash": "0",
            "timestamp": 1712639581,
            "hash": "8f4a70c190aecfa52140df94da64f35ab421f93a71215ce9ee925b4bae476e0c",
            "merkle_root": "2f1fc8f9a46e6b041f6a30e1edc333efdbc8439d45eda37483b57faeabdebe71"
        },
        "body": {
            "transactions": [
                {
                    "txid": "2f1fc8f9a46e6b041f6a30e1edc333efdbc8439d45eda37483b57faeabdebe71",
                    "timestamp": 1712639581,
                    "data": "Genesis block"
                }
            ]
        }
    },
    {
        "header": {
            "index": 1,
            "previous_hash": "8f4a70c190aecfa52140df94da64f35ab421f93a71215ce9ee925b4bae476e0c",
            "timestamp": 1712639581,
            "hash": "926fc5be2ba59f2dd99bcff1b7354afb2a2fbe859a6300cd477a1160cff7dffe",
            "merkle_root": "98c3662171cb67c678be2d3603537a1f5b78fbf0282929c674421a0777cdfb3a"
        },
        "body": {
            "transactions": [
                {
                    "txid": "574cb0eee99efe4ebf7e15c4cba2a80de481e439d712154f2322ce1ae9356fe2",
                    "timestamp": 1712639581,
                    "data": "Transaction 1 for the first block"
                },
                {
                    "txid": "c42fbd20b187e47f1633488f79c3356c5bb56643bf50c6b7493923a4646db713",
                    "timestamp": 1712639581,
                    "data": "Transaction 2 for the first block"
                },
                {
                    "txid": "b87ed193952dbe1961822099ba2f07cd3ab7ff772dca2f6fcfd92c63b84af0e6",
                    "timestamp": 1712639581,
                    "data": "Transaction 3 for the first block"
                },
                {
                    "txid": "3a45962d7b9bc2ea719158c5ea26e0febc8e236863b55aa9b779e36913345511",
                    "timestamp": 1712639581,
                    "data": "Transaction 4 for the first block"
                },
                {
                    "txid": "71cf1bee03a73b987f25e4f00f2da13185d046f129a4760b4e5e68b0de47b629",
                    "timestamp": 1712639581,
                    "data": "Transaction 5 for the first block"
                },
                {
                    "txid": "fbe4af2b99317925370c69e20abe314c24aa15e26cd2ac7431f61b1c6651a617",
                    "timestamp": 1712639581,
                    "data": "Transaction 6 for the first block"
                },
                {
                    "txid": "17a4c191f1b17aff53ac1f37a959f0e6de56d285fcd8039817e200c20db5dd2a",
                    "timestamp": 1712639581,
                    "data": "Transaction 7 for the first block"
                },
                {
                    "txid": "8477d1eb1ec4bacabbc3b688955ea9afa62cee2e3f6f16fc5a5ef63c295e7013",
                    "timestamp": 1712639581,
                    "data": "Transaction 8 for the first block"
                }
            ]
        }
    },
    {
        "header": {
            "index": 2,
            "previous_hash": "926fc5be2ba59f2dd99bcff1b7354afb2a2fbe859a6300cd477a1160cff7dffe",
            "timestamp": 1712639581,
            "hash": "3a8ba51c7048f789924bfb122bd52fc106559d044525466029c9081c76922b72",
            "merkle_root": "fb23e38310339f23d22eeb3da565566f311f042ef88b894c4dd0cbc43ace966d"
        },
        "body": {
            "transactions": [
                {
                    "txid": "77fcf7fe04863229815b2c3824465111b7484f0774f3662d7557332e0f0495fc",
                    "timestamp": 1712639581,
                    "data": "Transaction 1 for the second block"
                },
                {
                    "txid": "5883fe29fcd8de631a0d5258296aea79b48557ad500e31cec2b8724eed2a33ac",
                    "timestamp": 1712639581,
                    "data": "Transaction 2 for the second block"
                },
                {
                    "txid": "40e83746666f079f38b9da84e0c9a48bfd1f779346b69ff9154b8e6839bf9f4e",
                    "timestamp": 1712639581,
                    "data": "Transaction 3 for the second block"
                },
                {
                    "txid": "11e4f6dc14ecc40f0856dbf35c6d5d3e5915272db321b79e47265d4701ca749f",
                    "timestamp": 1712639581,
                    "data": "Transaction 4 for the second block"
                },
                {
                    "txid": "f1c7ce2f519c8129c58e59751af194025a4c87cfb61e17d6391f404bac272f04",
                    "timestamp": 1712639581,
                    "data": "Transaction 5 for the second block"
                },
                {
                    "txid": "3b5446982e7924fcdfa8a5091562fb97ca33d2a84b8b3213139fa497f95a9ac3",
                    "timestamp": 1712639581,
                    "data": "Transaction 6 for the second block"
                },
                {
                    "txid": "c28a4a574250d5f79955e660acbfdb1a02446c5f1b65fd7896990685c190f2d1",
                    "timestamp": 1712639581,
                    "data": "Transaction 7 for the second block"
                }
            ]
        }
    }
]
*** Merkle Tree ***
Level 0: 574cb0 c42fbd b87ed1 3a4596 71cf1b fbe4af 17a4c1 8477d1
Level 1: 8f8093 9b5dab 42d951 dbc688
Level 2: c19934 7670a9
Level 3: 98c366

*** Merkle Tree ***
Level 0: 77fcf7 5883fe 40e837 11e4f6 f1c7ce 3b5446 c28a4a
Level 1: 08e932 0be540 7acd2d 166520
Level 2: 9faa9e a30491
Level 3: fb23e3



The blockchain is valid.

Zkusme data trochu cinknout - nejdřív změníme data v transakci.

# Tamper with the blockchain
tampered_transaction = Transaction("012345678", int(time.time()), "Some data for the tampered block")
my_blockchain.blockchain[1].body['transactions'][0] = tampered_transaction

# Print the blockchain
print(my_blockchain.to_json())

# Validate the blockchain
if my_blockchain.validate_blockchain():
    print("\n\nThe blockchain is valid.")
else:
    print("\n\nThe blockchain is not valid.")
[
    {
        "header": {
            "index": 0,
            "previous_hash": "0",
            "timestamp": 1712639476,
            "hash": "5b78475eabc9cad18762ae856b5f663b08790406e8fdd43efbc6681183d6585c",
            "merkle_root": "cf282e724495fa8791e53b6950848209bbd3929d0f73374cd52af60d76810d5c"
        },
        "body": {
            "transactions": [
                {
                    "txid": "cf282e724495fa8791e53b6950848209bbd3929d0f73374cd52af60d76810d5c",
                    "timestamp": 1712639476,
                    "data": "Genesis block"
                }
            ]
        }
    },
    {
        "header": {
            "index": 1,
            "previous_hash": "5b78475eabc9cad18762ae856b5f663b08790406e8fdd43efbc6681183d6585c",
            "timestamp": 1712639476,
            "hash": "7aadce932d58f5a8c72c7600e349ee39a94ba72e27a7fd4aa05fbd4c6008b415",
            "merkle_root": "576d0882e35cb2fd3edf40a51c4f8400d3900e25c7d245845f723726ff480b1b"
        },
        "body": {
            "transactions": [
                {
                    "txid": "012345678",
                    "timestamp": 1712639519,
                    "data": "Some data for the tampered block"
                },
                {
                    "txid": "08b2cb7d5f73ffa2a5de6c9ca12ae49ee017f5622b33a8efed59e649838be5e1",
                    "timestamp": 1712639476,
                    "data": "Transaction 2 for the first block"
                },
                {
                    "txid": "cab62541057b9314d8463f7e792423f89f9658caea23f0282420f977ffe735f4",
                    "timestamp": 1712639476,
                    "data": "Transaction 3 for the first block"
                },
                {
                    "txid": "8605bc98bb69931553777004f25b566c48ada4bfe3d0e0486880511ba7d6767b",
                    "timestamp": 1712639476,
                    "data": "Transaction 4 for the first block"
                },
                {
                    "txid": "81d959118b3f28b8511ecac51d6498859da8d0e226d787e575abbe5d913e00b7",
                    "timestamp": 1712639476,
                    "data": "Transaction 5 for the first block"
                },
                {
                    "txid": "5cb6a8c659e10f07c8eac756ff9cbe2c9e1cfa62f2c71ff85fe11a61852d33c9",
                    "timestamp": 1712639476,
                    "data": "Transaction 6 for the first block"
                },
                {
                    "txid": "654dbc8a9acf74d94fd244717def0875c14bf7381228ff410b89bf00bf8e5f5e",
                    "timestamp": 1712639476,
                    "data": "Transaction 7 for the first block"
                },
                {
                    "txid": "2f7f119feb4a6d568e6b167992713fe97a66a0b60e62ab5f436902101ac5cc81",
                    "timestamp": 1712639476,
                    "data": "Transaction 8 for the first block"
                }
            ]
        }
    },
    {
        "header": {
            "index": 2,
            "previous_hash": "7aadce932d58f5a8c72c7600e349ee39a94ba72e27a7fd4aa05fbd4c6008b415",
            "timestamp": 1712639476,
            "hash": "7de79e826ad2b97788661a75ee8d7e135ab4afbd291c6b949e35ba4d28983a08",
            "merkle_root": "74a30d605ece659d477f15b208d1057aa7474b90283ea551430b9fd1de6504d8"
        },
        "body": {
            "transactions": [
                {
                    "txid": "e6a42b20068caea012a8a89814a11bbef43e6fc7a62f6f2a43e9012d90e5e03a",
                    "timestamp": 1712639476,
                    "data": "Transaction 1 for the second block"
                },
                {
                    "txid": "c5a5c5feec0f1b6a0527c1c0fd80c87fde0afa2660f24639ed7153a84d3f6dff",
                    "timestamp": 1712639476,
                    "data": "Transaction 2 for the second block"
                },
                {
                    "txid": "81eaa7d1d51a58b6489a312af7b02831c2ac16a03b49e3f6ce476be94376711a",
                    "timestamp": 1712639476,
                    "data": "Transaction 3 for the second block"
                },
                {
                    "txid": "5433a2f4f6bee30f6669a1e0d4ae84ea38dbc93f547dfad9463bfde6de4f9be9",
                    "timestamp": 1712639476,
                    "data": "Transaction 4 for the second block"
                },
                {
                    "txid": "25bc3000b773b0f8ea9a346bf8f1bb14d927c1053e8aa0cc9bc153404512fd8b",
                    "timestamp": 1712639476,
                    "data": "Transaction 5 for the second block"
                },
                {
                    "txid": "c694bd170acbdefaa8367add5191149e7e2c0cd7b2bc1d235c1802267687268b",
                    "timestamp": 1712639476,
                    "data": "Transaction 6 for the second block"
                },
                {
                    "txid": "092b61af600e2627322ce2f551e2f968f032585e102bc7f497f1f6e312ae1b88",
                    "timestamp": 1712639476,
                    "data": "Transaction 7 for the second block"
                }
            ]
        }
    }
]
*** Merkle Tree ***
Level 0: 012345 08b2cb cab625 8605bc 81d959 5cb6a8 654dbc 2f7f11
Level 1: 9cce19 b98c84 652199 a1bce0
Level 2: 1130a0 6ffbda
Level 3: 2b8de5



The blockchain is not valid.

A nebo zkusme jednu transakci nenápadně vymazat.

# Tamper with the blockchain by removing a transaction
del my_blockchain.blockchain[1].body['transactions'][0]

# Print the blockchain
print(my_blockchain.to_json())

# Validate the blockchain
if my_blockchain.validate_blockchain():
    print("\n\nThe blockchain is valid.")
else:
    print("\n\nThe blockchain is not valid.")
[
    {
        "header": {
            "index": 0,
            "previous_hash": "0",
            "timestamp": 1712639581,
            "hash": "8f4a70c190aecfa52140df94da64f35ab421f93a71215ce9ee925b4bae476e0c",
            "merkle_root": "2f1fc8f9a46e6b041f6a30e1edc333efdbc8439d45eda37483b57faeabdebe71"
        },
        "body": {
            "transactions": [
                {
                    "txid": "2f1fc8f9a46e6b041f6a30e1edc333efdbc8439d45eda37483b57faeabdebe71",
                    "timestamp": 1712639581,
                    "data": "Genesis block"
                }
            ]
        }
    },
    {
        "header": {
            "index": 1,
            "previous_hash": "8f4a70c190aecfa52140df94da64f35ab421f93a71215ce9ee925b4bae476e0c",
            "timestamp": 1712639581,
            "hash": "926fc5be2ba59f2dd99bcff1b7354afb2a2fbe859a6300cd477a1160cff7dffe",
            "merkle_root": "98c3662171cb67c678be2d3603537a1f5b78fbf0282929c674421a0777cdfb3a"
        },
        "body": {
            "transactions": [
                {
                    "txid": "c42fbd20b187e47f1633488f79c3356c5bb56643bf50c6b7493923a4646db713",
                    "timestamp": 1712639581,
                    "data": "Transaction 2 for the first block"
                },
                {
                    "txid": "b87ed193952dbe1961822099ba2f07cd3ab7ff772dca2f6fcfd92c63b84af0e6",
                    "timestamp": 1712639581,
                    "data": "Transaction 3 for the first block"
                },
                {
                    "txid": "3a45962d7b9bc2ea719158c5ea26e0febc8e236863b55aa9b779e36913345511",
                    "timestamp": 1712639581,
                    "data": "Transaction 4 for the first block"
                },
                {
                    "txid": "71cf1bee03a73b987f25e4f00f2da13185d046f129a4760b4e5e68b0de47b629",
                    "timestamp": 1712639581,
                    "data": "Transaction 5 for the first block"
                },
                {
                    "txid": "fbe4af2b99317925370c69e20abe314c24aa15e26cd2ac7431f61b1c6651a617",
                    "timestamp": 1712639581,
                    "data": "Transaction 6 for the first block"
                },
                {
                    "txid": "17a4c191f1b17aff53ac1f37a959f0e6de56d285fcd8039817e200c20db5dd2a",
                    "timestamp": 1712639581,
                    "data": "Transaction 7 for the first block"
                },
                {
                    "txid": "8477d1eb1ec4bacabbc3b688955ea9afa62cee2e3f6f16fc5a5ef63c295e7013",
                    "timestamp": 1712639581,
                    "data": "Transaction 8 for the first block"
                }
            ]
        }
    },
    {
        "header": {
            "index": 2,
            "previous_hash": "926fc5be2ba59f2dd99bcff1b7354afb2a2fbe859a6300cd477a1160cff7dffe",
            "timestamp": 1712639581,
            "hash": "3a8ba51c7048f789924bfb122bd52fc106559d044525466029c9081c76922b72",
            "merkle_root": "fb23e38310339f23d22eeb3da565566f311f042ef88b894c4dd0cbc43ace966d"
        },
        "body": {
            "transactions": [
                {
                    "txid": "77fcf7fe04863229815b2c3824465111b7484f0774f3662d7557332e0f0495fc",
                    "timestamp": 1712639581,
                    "data": "Transaction 1 for the second block"
                },
                {
                    "txid": "5883fe29fcd8de631a0d5258296aea79b48557ad500e31cec2b8724eed2a33ac",
                    "timestamp": 1712639581,
                    "data": "Transaction 2 for the second block"
                },
                {
                    "txid": "40e83746666f079f38b9da84e0c9a48bfd1f779346b69ff9154b8e6839bf9f4e",
                    "timestamp": 1712639581,
                    "data": "Transaction 3 for the second block"
                },
                {
                    "txid": "11e4f6dc14ecc40f0856dbf35c6d5d3e5915272db321b79e47265d4701ca749f",
                    "timestamp": 1712639581,
                    "data": "Transaction 4 for the second block"
                },
                {
                    "txid": "f1c7ce2f519c8129c58e59751af194025a4c87cfb61e17d6391f404bac272f04",
                    "timestamp": 1712639581,
                    "data": "Transaction 5 for the second block"
                },
                {
                    "txid": "3b5446982e7924fcdfa8a5091562fb97ca33d2a84b8b3213139fa497f95a9ac3",
                    "timestamp": 1712639581,
                    "data": "Transaction 6 for the second block"
                },
                {
                    "txid": "c28a4a574250d5f79955e660acbfdb1a02446c5f1b65fd7896990685c190f2d1",
                    "timestamp": 1712639581,
                    "data": "Transaction 7 for the second block"
                }
            ]
        }
    }
]
*** Merkle Tree ***
Level 0: c42fbd b87ed1 3a4596 71cf1b fbe4af 17a4c1 8477d1
Level 1: 61c0da 0aff40 523021 e86744
Level 2: 925f7e d42dce
Level 3: 45c4ef



The blockchain is not valid.

Větší efektivita na walletu díky merkle tree

Na závěr si vyzkoušejme jak by to vypadalo, kdyby bylo transakcí mnohem víc, třeba 4000.

# Create a new Blockchain
my_blockchain = Blockchain()

# Add 4000 transactions to a new block
transactions_data = [f"Transaction {i} for the first block" for i in range(1, 4001)]
transactions = []
for transaction_data in transactions_data:
    timestamp = int(time.time())
    txid = hashlib.sha256((str(timestamp) + transaction_data).encode('utf-8')).hexdigest()
    transaction = Transaction(txid, timestamp, transaction_data)
    transactions.append(transaction)

my_blockchain.create_new_block(transactions)
*** Merkle Tree ***
Level 0: 5ed52b

*** Merkle Tree ***
Level 0: d8c465 4c86fc c788fc f860a2 a42b1d db2d79 f94d99 c0c255 8054a3 0d2150 a1ac8c d0cb63 bc12fb 6504e2 737391 ddc113 8ed935 2792e3 63898d 802e62 d26a1b ec4186 649b24 d1d7b5 741c0c 4f8047 7928b6 9bfa32 7645d8 b08f91 900831 c663b3 ca98c3 004558 df35b2 043129 7c9fd6 b3f881 7228cb 855da2 53e6d7 cfb11d ccc213 fb2774 b9a4c6 51ff00 62091e 58a87f 4900a2 6e1100 942c89 1b1655 323a82 233b95 a96fa2 614036 8a1457 2d26a9 9e5ca8 61151c cadada becf08 97fa59 25f6e6 8e50c4 4e4aa4 d991e5 5bdfa4 4c1388 b21167 f60e74 95f1bc d81e6a 71cc14 afc6e3 3d7e22 d71ae0 036a3d ea3014 a9ea4b e131a9 f2b256 f8eb6d e776f7 180259 f32ee3 86be4f 0693ce 6ccffe 6d452d fe7517 f55104 8deba2 843e39 5504ea 4f4042 4ef261 bdbbf3 db3133 faf4a3 7eb24e f31c4c 79a358 72ec28 11bef4 c473ce 692ff7 043002 0ca651 a9a29b a2927d f30ea2 16b4e9 c9d286 9ec33a 4049f2 9900fe b87b5f 0f1de7 93e61c 65ecfe 7a6dd3 af60e4 1f122e 148920 23776a ce21a0 8ef4aa baa9a3 d0a606 3a74b7 c1742d 3a5834 1c7112 184da9 f8c753 725ff3 382f5d 373c9f e41c60 dbf7f4 fbfa72 a6a6be 0c650c a1c1c9 bd985c 73a207 ff15f6 e741f9 bd4615 982086 75fdf1 58ea9d c4fd0a 3b6094 b1e37c 1b90ae 047c1c fb3223 eb13d7 2f1093 d48aea 60b282 8b22b2 eb6e54 212810 c5607d d3ce74 f804d9 f95661 fd8004 4d6ca1 6fdf4f a09e5c b3f02a 9d3cf3 d67fae 98fbb2 ee87fe 333096 0f0e2b 7007b3 f54e2f 08119f def02c d2866d a3dee6 1d99a2 76e636 78941a 3fc043 049295 48e3bb f3cbec cebdb9 58bd1c 4789c5 ea7df8 912902 a0a665 ef3ad0 29e7aa 92c7d4 f5663c 5ae249 19bf57 06d42f 824613 85ffa5 b6ad0d ac6482 fd9f00 291f43 7d1eea d67281 cd4d7f ff0503 7c5c63 6c8f37 c23a0f 299f29 323dbc d0a7ad c88217 7ccb0c 1d35fc 1116c3 5a2a9c f296e1 b0c6f6 7219f2 d524bf 9e8674 5cc6fc b28d1d 289628 ff243b fe7e3b 7950ed bf0c71 8849dc 744ddb edc503 57d347 c2acf6 6453a5 3239bb 782a9c edc767 13bcb4 fda3d0 b093d2 0bf673 8cb138 b910ad e4ce8e 5dd2c0 28d64e 5f515c d56147 6c06ca 0891a0 40fa64 3bf212 8c8b0d 6fd552 ab79a3 3c07b2 509a64 882fa6 3fbc92 9425e9 bca9b2 b07b33 d51d8b 176c14 3b3899 148c87 f0fdf8 7785de d9457d 346363 01bba6 9389d0 0fd30a 8a3f7a 5d9e9e 7292cf f48e02 dc60e9 59c303 3a1dd5 a882ab c2f4ab 62fee8 d19797 3958ad 891246 66f20e 3aee68 cb8269 fc77ed 243812 482d8b 379c82 402623 24078b 29ff85 c91912 cd76c2 c826fd 3f053a 8d2361 f73d81 8b7b83 f37ed0 8c82d6 9439fa 0b5d91 e50095 b6bd8e 9a0127 4b5fb5 48d280 8ea119 c16e15 1768f8 83bd5b 6cf627 6ea264 200ab6 ddcd8b bacf87 4a9986 ca4fe9 fa9dfd 429c15 d63d92 3db71e 29c9fc 5ba959 c2d62b 18bedf 86970a 9e21a8 dd48f2 086e5b ab2df0 00013f e1712e 0f2127 c42058 f9605c d310db fe0d1b 058338 feb689 16bba4 7d133c 4322cc 85f940 524da3 639d32 d39ea7 d7dd8b ee1136 3524e4 e0f4c2 4311b0 11eafa 6e66ec 293988 289c15 81a3d1 810df9 742ddc 45addc 9827d7 cedf19 05f465 a6d7d0 a3033c d9e625 b4df1c 8ab23a 642c9a 030ae2 7be069 2428af 6c797e 2ce31a cb47fc 7e63a1 25ed08 ef7df6 b7c07e c705c6 068453 d4b5b8 007cb3 7bfea3 b6b722 a1e09b fd8576 8c9d3d 8ece48 b1cf02 54b3cf 3cd930 444a58 4bdfbe fcc8f7 741c08 212c24 7afc53 7b9480 472be5 beb09e 9f4ae2 1ed139 a223ef c93ad5 280390 60860e f3a971 3ff292 b12fbe b2bf62 bc3bf9 49fdf0 c2cd6a a78f97 a287ff d21501 40eacc 6b1b3c 628e97 49c1bf 0647cf 63ac0b 6cb66d ffb122 ede7ea 16a7b5 8b222e 1c2f28 67e02e d44731 1a7220 455a9a 0bf302 287c5e 25a2bf 0765a2 1d0a25 f28b3a 628667 2a74bf 1a31cd 3b2a6b a24acf 30cd31 3e2be3 d96884 809353 6d573d 294b27 978642 798858 cf4fc1 21b67b bf9204 ce322e f238bd e4f044 abe0a3 d19e9e fd4ded 630c12 e87c36 7932a6 0d79d9 2bc27f e36f88 cf6ca5 30c565 0c94c9 8f5adb f502c9 fcfd69 bb331f a400b8 89006f 69e724 7e7232 0fe74e 8747b4 d2edd3 15cbec 95a23e 527735 758d41 7fc269 7975a9 7ec1b7 700237 789a01 6a19b3 84f39a cd4643 eb5c60 9304c7 55fd4b 00497c 3d6de7 167e17 da2079 c99f1f 95e4dd a69ff9 aacef3 40806c 0031bc 13ea52 63fbb7 733575 7f209e 15160e cb0c21 cbdc87 e1fa98 c91132 e8a04b 5a9edf b96865 8f4975 cac010 9741c1 130fa5 f35d0c 6e3f11 27a178 e1ddbf efb94a c16f7a 50c7fc 0b9a26 6d0ade af7dac e3b792 b522b5 e54d7b b87bdf 1bef5f 7575e5 469008 dcb8ed b60301 301d4f fcd486 42cb0a 3aab12 ba8993 6f13ab 46243a 4490c7 ff9ae9 81c304 65ede8 0f3ffe b81b96 6130e1 8f1ab3 340b5f c5c1f4 20513c d383c6 88c500 b37233 36159e eb65d0 4c457c 69a502 e9955e 419d83 d8fed6 72f47f 8baa0a 961199 8027fe 79b404 e7c1bb c5d676 94a54a 9e09b9 a35705 bf17b5 a6f72d 9c4bfb aed578 baeb14 513a78 c98e4f b9082f 5a5456 308a32 2a636c f5d819 243d0b 82d03f 9937c2 b599c2 5cdb57 5ab6f0 4d1970 23ba2b 2d2ef0 a9d0bd 0d7654 819dd5 a31d27 e1c512 6285ad 60fbe4 5548ab 8f8c1c 726d1d 1e71a5 130b01 5de453 0e765c 22aa1f 0a504b a48579 7d3283 ba2acc c17fdd 6acbf2 360dfe c23cb1 b29fa5 1a19f0 246f3f 62c71b 618569 ac6aab cdd272 8a3f98 d2fda0 0dc95b 5a557d 8c2d0e 91bb66 e2f175 2eeed6 e2b34a 081dd6 7f733f 0a8dd2 5e2064 c0530c d1fd06 1903f8 743243 72d036 4ef9b0 e77c40 24640a f45f23 4f95ba aa29f3 abf25e 2d600a d06a94 58914c 358a3e 37efa0 8cd47f dc242b 84d993 3f2caf ed64ad 04677e a5864a 6e4936 719dfa 4d90e9 82a195 989018 c614c5 76a39a b1ecec d25d41 da3041 0f32a9 f3b6b1 5a37cf 389766 c299c8 3daa5d 7bd19b e2e888 226fa6 132e14 efc777 0777a4 e7f33b 86e93c 26f63b 1b9a9a 8d7639 53de80 49c44f b0f7ae 3d2e1b f78e0a 631751 c1c10e a15235 f16f3a b3b5ce f22eb7 91cc3b 962354 98d522 0ab157 c00a64 bf6eac 75e350 c1219e 979fa8 c06c71 cc347d 5cf9ca a08060 24879e 0ee6b3 f45a99 39ce37 e97b11 3bbf3b 2b5f6a 4a0912 b433ac ab2a2c 5a4f5b b2f048 ceab9b 8cc8a1 5960c7 955d1a 67bfbe f31f38 37ec31 867718 4b2776 661593 cb7c09 3462e4 943cbc 94547c c832df 628ecb 6d0b8e 65bc77 0b75ca 37bd39 f4363a 6e18ac 26a9a1 e057b2 d313ef 6ae19a 65874d 4022c4 b3c5e9 dbb79a 579624 a46bb8 66d462 dcb217 dab455 f933c3 25c031 2e8316 e1cda1 491a58 fca752 a972cf 53e1ca b22dc2 1eeeef 129a80 9ce466 f689e2 9e27f5 9f75eb fb94b1 45a379 7dea51 9c0020 cdab87 563ce8 fa228f 3a7240 3dd3c7 8a41bf 42fb8b 291c40 986718 6baf65 c0f4db 0e2a54 97d491 6e7b09 0f6688 88bced e07381 744e47 05d2b9 bd5d34 dd4fea 2b1227 f4931a a8f5c1 fbd2fd 3b5614 864e2a 817a59 531229 e7470e 81cdc1 e65746 b8cb42 158899 5c215b d851c9 8590ae 76a710 90ce38 4c2a4e 443495 400148 7aaa4e fc4869 13e030 450eab 3024ba 5c3fbc 16d11f 23ff1d 66f729 38af08 1a014b 5518d0 deadf7 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225272 1081b1 f9849e 5fbce5 34e5f3 c5f974 e088fb 04ef4b faa48c 0de03a ce579e 8afe8f afa3d5 3fc8c1 cdf872 f79d0e efc0fb 5130d3 995981 7f5cd4 5c4d74 56db93 c3c36c a551d2 4cd83c b0b142 6d4409 1e9ef2 3bfe45 7e9e42 fb60a4 bda058 d6fbd9 9436e3 413f83 5030c7 c877fe 602159 822f22 89e606 bc960a bcdfdd fe6c6f 3a5ff8 1d234b 7a66b5 84cb5a 682cbe ce04a3 aa785a 972ab5 0049bc a14161 557de7 158921 250e0d 8ee2e5 4c0239 b949e4 1a08eb b9f5cd e9d1ce c6791d f88bdf 7aa91f e7b6bc 759b32 60949d 405d43 e4fbcd feff3d 6d4dd1 71dee2 b91520 9016a8 fc098e 937299 eb6dd3 f69e49 8256ca 580722 c0c255 ef7e7e bb4a1e 49ee50 38330d 87641f c74fdf d6261d 8952a5 ad7c16 9e11e3 d239d8 81356b 52e648 12c015 8da857 98fc97 ff1b84 275859 d5af7b 3c3bec 21ae1f 2360c5 0fe8d5 cee836 67b499 3bbc9c bfa5c6 f45469 e48219 ddecac fb761c d9bd5b efb25f d01911 ba24e7 b3444b 1e5615 0d4fcc ff2d24 04c33f d12bf5 b4e9a6 e99ec8 4dcf3b ca758d 6e9b36 de5e55 795ab4 96670c 286042 e2a167 5472ae 1718d4 3b6e28 5a163a 9863ed 238190 f94f64 2bdbf0 d2d6fd bb7693 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d5747a 1cfce8 749738 0d4709 b59296 8fa167 af8b6d 6f0007 6010a0 889ed3 fb3784 dc472a 376705 cc69ba f45421 8e29fb 983141 26b9b9 c8d89b dd27f3 644987 38fb70 5e882a dc6106 aa7495 fa668c fe4d82 fe2a94 94baba 68d7c8 742519 2766c0 d4cc05 322279 cbf629 437722 65ad84 92f406 eb48b5 40a3c3 718408 fc8fb4 eef916 07e684 9c41df 2a603f 2d2f45 750038 0a198c 752fc4 a822eb 90df5b e14e83 e9b0a2 8e226a 21e944 981d6e 176022 b6c4c3 d270c8 08eda4 c3712a c0afc7 1740a8 5b7343 9253a6 2dcaf8 df0cc6 25d200 793027 84232e 445558 ab85c1 c68905 d6b690 d68e46 75474c 7e9a9a 19af78 9b6858 c712cd 169e46 170dfa 18ec60 c0ace7 84918b 4a0f3e 614ce0 3ebdfd de4cfd 936c79 ae259c 53193b 3ee35a be09e3 558b9a d511ea f58de3 c8a166 4e42b3 373506 992075 b89a4b 30d1b4 499989 5d0bd3 21f146 bb1409 4fc82e 33248c bcc429 989afa 573e59 c01ed3 af9690 5c0264 91d344 7c0839 0e4502 e07a35 8945b1 29c98a 9a91e1 1c69f7 faf254 53c101 969c06 4e3243 5816e7 1a0f87 f3cd3e f9bc28 e8841e 0dfc99 e9334d 9e315d c35e88 568282 3436b3 fca761 789759 33d8f6 d12486 b9f0b1 fba221 8de0c4 178266 469cf3 79e26f d7119f f7e9b4 1b58a2 5eb059 6e0761 73b7b8 186c94 3e3769 b22c6d 5c53c7 15f28c 1a7c9c 4afb33 67bd0e d4b645 f7590c 33839c dd188e 8e7afd d066e6 84b633 a50a19 423ac5 74f496 4f4e87 237139 444ceb fe0b2c 02c2ed 48b3ef e1454c 5c9061 223ad5 9b782b 1459e0 f972b8 94c886 a533ea 4430df d7da8c 355e39 d208a4 7801ec df9da4 2459c1 f04f70 d28ce6 43e4a1 e2a817 53f41a c95174 232c89 b3cce1 706060 9168df bf62e7 ee5c39 8a6732 23ca1c 8c7d02 3fab68 3f9901 e52323 a46ded 356bda e814ef f7f096 b1c762 59f63e eecd39 51e0a8 ba46fb 3eba64 f40295 02480e 4b7bab 1b2a7f a3fb2f b749d1 ba6337 a164e5 dec72a ce8d4d b51ca3 646afe 66d224 1f7dee d34b08 9d77cf df091e 91d780 1a3a3a a23870 002470 376296 25a94f aeb63a 80cfc0 e42b13 9c6a92 5a759c ea959d a1dd20 e821ae a00f4f f168a2 d23ae9 9528d4 1eb459 08029a 4c7e1a 304aea f40c01 4b915b 5b1299 1d5690 c95160 6bf65d 3ea7e5 7933cc 5a664b 614b64 bfe079 86dc36 502132 4251f7 f314a9 616631 7bbfa4 60a6ad 4c50a6 a32f13 3fcc25 8c18b1 72b927 919f15 1907b8 141abf 76f594 e7ed48 a10bc7 466b19 ff6ae5 4ee7fc e70ded c707d6 fd93a9 124e05 1f94a3 6bf69b 14b597 1ffdce 8ba238 0daf75 a50ee6 bf08b4 40a54d 50cf5d a144bd 430715 1244e3 71b926 ff9ecf 518286 a45ba9 235c03 501554 3fbec2 6b0e63 06c736 008d58 05fda3 875d1e 2da51d 6d703c 8fb4b9 181970 68392d eab88e 86c310 e63a3f 1d2f15 5a5131 132d31 d6e448 c5cbbd 4fbc7c 874ad4 8611d7 39e2a5 2ac455 b76a50 cd3edf 706add b6dcd8 bf4cd0 ec0200 6d974d 297287 d190f5 67927b bc00e2 a037af 1b80bc 41b9bc dee81d 1ca931 196b1a f02a3c fafd8e 55b297 17eef3 e9d747 604122 9930bd 4d95d4 a2e45d 0151c2 389433 bbabba dee040 5e1f05 9cd293 cd1836 d3cd5a 06f665 acbde4 a4ea11 9af807 0ce117 5e5253 fb0e53 06cb15 98f593 526310 540a08 1c76d0 bbb5a8 bf97c6 cecfe1 b1dcbc f248b5 d9832c c31049 de254a 0032e7 f9fc91 e89cfa 8b420b c12699 1d918b 7b4733 d94253 6c3515 db9411 25ae66 55c10b 0cf297 753546 72a8e4 68b223 fb2ab2 60bcac c94e10 4198cc a7941f 05eb6e 56d04d 44b429 cb1608 f7f0ac 46b5c2 269408 482282 7a71a5 833a65 8c4021 854c90 c22877 ed35f2 26b380
Level 3: d82e04 406cc0 afda40 0bcb46 890110 3ebebb 4a0df2 cf3430 f78aa4 8feba6 4e78f7 8d6bc7 d0780d 28aaac 7653d4 4416d4 e96c49 f48ba1 7e4377 8fd6ba 440362 930eb5 197024 b612bd 41ae7a 23bfcd 94f063 e5a9fb e1906e cc52f2 953913 737fcc 55e549 86d549 e157b1 c7b2a4 851ec9 731b4f 771c24 bbb4ff dc489f 9d9f4f a152bd 9e01da 336acd effe1a 925d1a b2efdb 1dc4e4 251e83 8a8fbc 22be05 766a72 e11b5b e2ed33 11dc0b e7dfae ecd834 60a1ce 7394e6 e866a1 5c2530 4f7642 83b26c de9d46 f45921 4b4c1a 72d391 048052 3b0b39 96d641 540d83 1183e2 2c20b8 c6ac91 1b8d27 a1fdd2 75a3ef aa365f b8921b 822a55 d04379 3f4174 cabe72 b7b3a6 a60805 4a0705 e113b3 15a2f0 cd53b2 24bbe8 618068 42f99f 545469 6db5f7 a1411c 37f07c 1582f6 88eb48 5c608d 566f35 d194a1 044e06 262a65 a16d26 e272b6 0ba302 2ee457 fa6926 230220 993d22 d612ad e4514e 80a1ab eb63e5 720ad6 497ba4 eaf45f 5fd43b 46d3ce 80b1af 285fdb adb18e 709cdf d268da 5aa6e6 53f9d6 1277ba b31de0 c822ac d89789 d9cdff c54529 d102e5 897fc8 4b4a00 66f014 cd2363 a32954 2efeb6 557480 c2197f 6dfb60 7936e7 47cbc7 958c8f c81a60 dd3b3f ca04e2 bbcafb ca4c2d 63d246 047cb3 26aa88 5a911b b33a16 cd2ed1 88b334 5f1563 095295 02a145 972f7a d74f4c 2884b3 fa0b79 4e4ccb b18a17 8fa1b5 8d63ff 91523a 316cc8 7ac292 6bbad9 6daed8 55d181 db6b80 ad2aa1 967dde a0347a 219b1d 2de0d1 19e4dc 0d59c5 b084ba fc63ea 67d275 9d1a23 b1b89d d1c20a ea76a1 74025a 3fa535 92028d c99060 f446f3 171361 f4aab9 f15250 047925 f4ae12 406c0a 9199f2 45e278 f56e64 381167 87cbbd 677de6 52ea81 17f660 227d2a 992343 19f8a0 f27f95 dc849e 2120b0 7380bc 42327c a80de0 4194bc a99abf 69080f 71eb4e 651acf 3be69e ee3213 545a10 fb0dee d32fbd 2727c6 623e48 cd21eb a570a0 de81f3 675c4b edcecf 43171f 6e511e 04b40a 613e8b e8505c bcf031 1ccfbc 9f6cdc 757ed9 0b4f71 8be66a 339d1c 718f63 6a7743 7258aa 3e058e f0d206 e597c4 140a1e f7085e 3725d3 335512 f431ed aa415d 6a32f5 7cb956 b23a83 cc78c4 8a22e4 7ecf15 e9b507 2aa179 39ee7c 3b5fbd 83e0a2 6aa5b5 c89e97 96931c 51bb66 583308 988cfa b0c98c a6b4bd ade8fe 8614de caaac3 d2f40a bf070e 6ba3e6 7cdc71 4ff1d0 97d289 b06230 18a959 df1237 e28b8b c5027a d9b9bb a2139d 3cc9c1 63b2e4 3f9bf6 1b6ad4 53f2ad 0dd876 750601 fe2359 cdcd47 782388 8235fa 4557fc c3aeca 5ce51d d49738 ff4b2b 57113c 3e6bca c5d148 444f00 2ac06f 8a2f07 07a349 83c803 db8a05 97691f f442ba 6cdb20 9b207e 101ed8 ef208a 0d15c6 5e9660 4746bb d0bb30 090540 334733 e76d08 e549f2 dd17ef 142f99 7ac95f b46274 fcfa46 4607bf c51cfb 885272 1da882 c03628 e2d70e f8d482 cca021 31e412 e6548b f8ec78 faa22e 8ca089 c5fbba 794096 0b2e60 015ff8 55e1f3 a2cc09 4df5a2 d83db5 f51d6b 694976 0c43fb 5b07a2 1e56a7 811cbb 3c0b9a 084733 c7279e bd8608 e1929c a4a7a8 fa1033 fa182a c09368 f4d508 91975b 400073 bf2111 99eb3c 300f64 b615b1 b84d19 a3f7af 5568b8 2c42b3 9b7a69 5769a2 39cae2 97a9d4 98bf98 a75b13 a2ecdf 33b82d 3d2358 6e642e 89a84f ebf124 895211 028ce5 8d93d6 00eb4a cd8caf 8b0e56 84d3bd 437f89 fd9c3f a889c9 3fb3ca 733122 b9fca8 c8fac4 44b624 caa796 f8b1ef 7e45d6 179155 cb84f4 0e100d 3e7718 9f99f0 d59355 12f62f 9f6868 62d9c8 55aefe e78077 22d482 755340 13299c af860e d1d094 42f6b7 cfa316 2898a5 4f620d 41e36a b101d4 ee5d6f fc016f 673f41 62d375 caf5cb d601e1 f9bb6b 4f248e b84ee1 0dfaa5 db56e9 393b77 08d51e 89a5f4 a90819 9a2ef0 98eaf3 6fee12 0e7969 1be914 56a8b7 5b235a bfabc5 1af18e 48536e 65f498 15cc43 691dc9 dc3687 9f9000 933525 a0e068 1d2257 acf96c 3eced2 8598f4 eed931 25043b 29a6f8 d91752 3888c4 c03b6b 6b5b05 f27f34 b7dfe4 a569c5 b741d7 a1aca4 530aad fbcd19 e52b0d f5b2e0 34be4c 8b2337 825506 75b9ce 2026bb ecdfba ca3728 8e0686 c961c0 80cef9 e9b228
Level 4: 785023 4fcd7f bb4051 d5f20f 041600 ba3520 c1c32f e558dd e2a288 c3e65b f37a7d d85d85 7a75ae 65967a 7af0b2 66b6e4 49528b acac72 5a153e 0b5184 219f25 a69909 bb97bd d03511 a007fe 6c0eb3 8d4286 6b29f4 20e053 702894 459366 57a92c 5feae1 eb8bb2 b5b51e ed0925 01929f d44463 434d01 8f4839 b91786 6f00f9 f3dd0f 60ce55 30935f d8bb8a a25f77 17a014 c1a374 559e6d 71338d d6e90b a23500 50a9fe 977df5 c450a3 2937fa e44ffd 399e72 c3354e af8827 e4d18e 6fc810 e551bb 3c0c54 02515d f50985 ddaeff 16968a 48f99f 1dc06e b07995 910b24 d8b51c 8d6463 f295b4 4c28f8 8237d2 7a19d8 0df04b 04464d b18430 dba147 2f0783 592b79 347c88 180af2 0de207 91ab97 7b4426 710249 c17598 90a8e9 34ae14 84db2f aec966 917ce9 d33d72 582770 777564 404428 c1fe87 c63083 d80788 b5673c 575f8a 927730 9ebeb2 696dd6 e373af d8bd3f af5d46 c16f43 05a6a5 0ad2e0 5a44e6 57e85d d6d8fe 7f1b1c eb7159 921226 c70b55 2dc774 bf8b37 888ced 6eed0f 31b520 ab5ca3 1efdf5 4882ce 44fc22 af0c81 89a6be 093363 d809d5 abfa91 640035 f9c020 625774 314cf0 bbfb27 80a12c 27dabc 8cdacf 4b04e2 3f970f d9e5d6 9637b1 e69cfb f97114 efa0ba efbf9a 4bfb4f 1b6707 5243cc 52b5ae 504366 351a97 efc089 eea98a ca13f2 636dec c4be4f 13cb03 f41749 5dcf1a 70d5f4 520e5a 0ccaac fd47a4 ad1221 8626d8 0728fa 72e4e2 1aa2f4 a137ae 3ecaa0 0d5433 a9fd8b 50a69c 4b8887 9467fa ec9e17 03815b 4b2536 37b777 062be8 e4e163 14bed8 5f0c4a 04f3e4 4c9855 ae6e5d 395b7c ddaf72 7cd29f 332a05 8da12b 2427c4 cb753a 5315c4 692fe6 b01d8a 744340 e8ed5d d7184b 17d7ad c32713 fd8756 d831e6 a1c155 898d82 531e48 e015eb 7128f0 38684c acb721 ef0217 70f5bc 925dd1 1ea2e1 3f8bb6 2a08d7 1a23ca 93d21a bd148f a48894 543ea2 103c52 f08262 e8b61c 7d4612 4a8559 4dbe69 019d56 868830 25b570 80b50f 2d5330 026aac 745b4e 09914e 022640 3c6dce d13a3a d5fd4b 5c6e59 fa5888 c0fb33 2d9dcf
Level 5: 0a6b0f f9cd19 290e9e 62e64e 5fd192 6b82ac 54fd90 9235e7 f5d5f6 d47d8f 6e8f7f c1e935 2db7c7 72d51c 37bd04 b9f74e 9388ee f7e10f 32d3df 0123a2 4a987a f62eda 11b4b4 19e41c ba0957 7720fd 2f54c2 257e9e 1f159e 62a597 c52d3f 3daea3 507d62 03e6c5 3bdb80 476fe4 e266df 879892 9dde2c 1f3fea f14aee dfe2ce 750794 e72434 43b1fe 0d76d8 3d5d87 a2750a ef863d e1e942 4dd739 be7996 9635f1 591971 afc482 39574c 410012 3deb4e 3e59f4 7bdc63 b49674 8cbc97 ae7216 51eaba ffd608 11685a 413c3e 30c680 a3ad3b e99804 855806 5d96d3 3a2959 cf9fbd 0b190e 6e2822 c8a8b5 bc97bd a12a37 53c131 16297f 594466 7e8fbd 0572c7 364c46 26034c aeefc7 e9d3cd 382242 ee99ce 5c873d aaa420 f00eee 9a553b d715f9 895750 8e8cae 782c8e 402384 f33ebf f3e563 ce97b1 9825da 76141a 9a8483 2520f2 c390fe a2f135 46e6b9 2ef684 b9546d 521ca5 e75101 932e28 8c18a0 9ed2b4 ef5739 cf216e 4a0833 66b189 3abc7f b23964 27a34b 91ebd9 71a85d
Level 6: 548509 ca0a4f 7b63cf d183cd 867fa8 813f60 5e7952 1844d0 4e06e6 44c98b 7eef0a 62b4ed 28931c 416690 6951af 7a7e2c d46236 fe4cd4 b1620a 778991 27392c 2cf755 694969 be4421 5f36db d970f7 87fe5c 591f56 917218 71a4d6 b91154 ec1aac 827c55 6d421d 27426b 9f2134 d5dab1 e5d134 e14e2f ce77f4 82d567 9ba14a 47b54e 8e7721 ea8122 ad1573 2603be e65713 c03cff 975af6 eceff0 85c486 3dcde0 b6beb5 bae648 c1c8d1 811c23 8ab8bb 929492 98fbcf 25bc47 826332 521405
Level 7: eb77c9 638cf5 a465aa 938873 1687f3 eb7d0b 3c221f 3ea5be 8c5029 eacfb3 876b01 cce3b8 c5f080 3905c5 693122 23bdb2 ec515e 574216 8acdac 1eb662 8a227c 0bc426 7ec3b8 39ccc7 bf70ec d4bdb1 ba505b 0c8264 bb1280 ed7c75 13f414 bf0012
Level 8: 141c83 5f13db 3e3cdc d93328 740c56 87ac14 d76463 ebe6d3 be6fea 4e2a08 f9e4ca 5d82ca 613e08 96f877 a9aa4b 1bd43f
Level 9: e535df 242cb2 0949e2 afdd7b 979b04 2d7a02 9bdf97 97ac8c
Level 10: de4d11 29aea8 b8c100 d30783
Level 11: dbf0cc 4c24ef
Level 12: e8d835

Tolik transakcí a přitom v merkle tree se dostaneme jen na 13 úrovní. Jak by pak vypadal příklad ověření ve walletu? Nejdříve si v roli nodu udělám celý strom a pak si představme, že peněžence pošlu jen ty části stromu, které se týkají její transakce. Šplhám tedy jen po relevantní části stromu. txid své transakce znám a merkle root si přečtu v headeru a k tomu mi stačí od nodu dostat jedinou hash (tu druhou do páru) za každou úroveň kromě root - tedy jestli dobře počítám, tak si musím stáhnout 12x 256-bitovou hash. To je o poznání méně, než 4000x txid. Výpis jsem tentokrát useknul, ať je to přehlednější a není tam tolik dat v nižších vrstvách stromu. Protože si ověřuji první transakci, která bylo v Level 0 hned nalevo, tak je krásně vidět, jak jdu jenom po té části stromu nejvíc nalevo. Co zcela nalevo vím a o jednu doprava potřebuji říct a nakonec musím dojít na stejný merkel root hash - tím je dokázáno, že moje transakce v tomto bloku opravdu je!

# To validate single transaction we do not need to see others and can get just one hash per level

# On regular node we can build full tree
merkle_tree = MerkleTree(transactions)
levels = merkle_tree.get_levels()

# Let's validate first transaction
next_left = levels[0][0]
for index, level in enumerate(levels):
    if len(level) != 1:
        hash_left = next_left
        hash_right = level[1]
        next_left = hashlib.sha256((hash_left + hash_right).encode('utf-8')).hexdigest()
        hash_provided = levels[index + 1][0]
        print(f"Level {index} -> left {hash_left[:6]} right {hash_right[:6]} --> Level {index+1} --> calculated {next_left[:6]}")
*** Merkle Tree ***
...
Level 7: 39d98e e283e5 08eef1 439065 7f811c c8eee1 3524d5 76c72e c46c0e c9c07a 0e226b e187e0 ee11c7 b77d15 97d54a e69842 3f80ff 4d66a1 d801c9 70b20d 81f7d8 c85947 92c77b 319724 ec433e a5fa70 79ee9c 4c23d8 3dd579 abf50a 4ecce5 d9e1d5
Level 8: ccb90c afc40c 1d27ea 6f5aa1 4720e0 a12979 683605 1130f4 0f74e7 c172b4 5d45b6 f4cda1 8421e6 277e63 3ae87e af02d5
Level 9: 232000 cd54cf 1008e5 6066cc 5e688f d7b1bf 4b6ca2 f8ba28
Level 10: 6de5fe 56b6f6 7a77ee 7d797d
Level 11: 7c1208 7e6da8
Level 12: 4dee3a

Level 0 -> left 401e90 right 74e167 --> Level 1 --> calculated 94c6f7
Level 1 -> left 94c6f7 right 7452e4 --> Level 2 --> calculated 2a64e9
Level 2 -> left 2a64e9 right d7026b --> Level 3 --> calculated c0fef4
Level 3 -> left c0fef4 right 52f798 --> Level 4 --> calculated c78419
Level 4 -> left c78419 right 6c42a4 --> Level 5 --> calculated eb9bf5
Level 5 -> left eb9bf5 right 85a86c --> Level 6 --> calculated 029fdb
Level 6 -> left 029fdb right 084481 --> Level 7 --> calculated 39d98e
Level 7 -> left 39d98e right e283e5 --> Level 8 --> calculated ccb90c
Level 8 -> left ccb90c right afc40c --> Level 9 --> calculated 232000
Level 9 -> left 232000 right cd54cf --> Level 10 --> calculated 6de5fe
Level 10 -> left 6de5fe right 56b6f6 --> Level 11 --> calculated 7c1208
Level 11 -> left 7c1208 right 7e6da8 --> Level 12 --> calculated 4dee3a


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