Python区块链块怎么添加

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每个矿工将从先前创建的交易池中获取交易.要跟踪已挖掘的消息数量，我们必须创建一个全局变量 :

last_transaction_index = 0

我们现在让我们的第一个矿工在区块链中添加一个区块.

添加第一个区块

到添加一个新块，我们首先创建一个 Block 类的实例

block = Block()

我们从队列中选取前3个交易并减去;

for i in range(3):   temp_transaction = transactions[last_transaction_index]   # validate transaction

在将事务添加到块之前矿工将验证交易的有效性.通过测试发送方提供的哈希与矿工使用发送方公钥生成的哈希的相等性来验证交易有效性.此外，矿工将验证发件人是否有足够的余额来支付当前交易.

为简洁起见，我们未在教程中包含此功能.验证交易后，我们将其添加到块实例中的 verified_transactions 列表中.

block.verified_transactions.append(temp_transaction)

我们递增最后一个事务索引，以便下一个矿工将获取队列中的后续事务

last_transaction_index + = 1

我们在块中添加了三个交易.完成此操作后，我们将初始化 Block 类的其余实例变量.我们首先添加最后一个块的哈希值.

block.previous_block_hash = last_block_hash

接下来，我们挖掘难度等级为2的区块.

block.Nonce = mine(block，2)

请注意， mine 函数的第一个参数是二进制对象.我们现在对整个块进行哈希并在其上创建摘要.

digest = hash(block)

最后，我们将创建的块添加到区块链中，并重新初始化全局变量 last_block_hash ，以便在下一个区块中使用.

添加块的整个代码显示在下面 :

block = Block()for i in range(3):   temp_transaction = transactions[last_transaction_index]   # validate transaction   # if valid   block.verified_transactions.append (temp_transaction)   last_transaction_index += 1block.previous_block_hash = last_block_hashblock.Nonce = mine (block, 2)digest = hash (block)TPCoins.append (block)last_block_hash = digest

添加更多块

现在我们将向区块链添加两个块.添加下两个块的代码在下面和下面给出;

# Miner 2 adds a blockblock = Block()for i in range(3):   temp_transaction = transactions[last_transaction_index]   # validate transaction   # if valid   block.verified_transactions.append (temp_transaction)   last_transaction_index += 1block.previous_block_hash = last_block_hashblock.Nonce = mine (block, 2)digest = hash (block)TPCoins.append (block)last_block_hash = digest# Miner 3 adds a blockblock = Block()for i in range(3):   temp_transaction = transactions[last_transaction_index]   #display_transaction (temp_transaction)   # validate transaction   # if valid   block.verified_transactions.append (temp_transaction)   last_transaction_index += 1block.previous_block_hash = last_block_hashblock.Nonce = mine (block, 2)digest = hash (block)TPCoins.append (block)last_block_hash = digest

当你添加这两个块时，您还将看到查找Nonce所需的迭代次数.此时，我们的区块链共包含4个区块，包括创世区块.

转储整个区块链

您可以验证整个区块链的内容使用以下语句 :

dump_blockchain(TPCoins)

你会看到输出类似于下面显示的那个 :

Number of blocks in the chain: 4block # 0sender: Genesis-----recipient:30819f300d06092a864886f70d010101050003818d0030818902818100ed272b52ccb539e2cd779c6cc10ed1dfadf5d97c6ab6de90ed0372b2655626fb79f62d0e01081c163b0864cc68d426bbe9438e8566303bb77414d4bfcaa3468ab7febac099294de10273a816f7047d4087b4bafa11f141544d48e2f10b842cab91faf33153900c7bf6c08c9e47a7df8aa7e60dc9e0798fb2ba3484bbdad2e4430203010001-----value: 500.0-----time: 2019-01-14 16:18:02.042739-------------------=====================================block # 1sender:30819f300d06092a864886f70d010101050003818d0030818902818100bb064c99c492144a9f463480273aba93ac1db1f0da3cb9f3c1f9d058cf499fd8e54d244da0a8dd6DDD329ec86794b04d773eb4841c9f935ea4d9ccc2821c7a1082d23b6c928d59863407f52fa05d8b47e5157f8fe56c2ce3279c657f9c6a80500073b0be8093f748aef667c03e64f04f84d311c4d866c12d79d3fc3034563Dfb0203010001-----recipient:30819f300d06092a864886f70d010101050003818d0030818902818100be93b516b28c6e674abe7abdb11ce0fdf5bb728b75216b73f37a6432e4b402b3ad8139b8c0ba541a72c8add126b6e1a1308fb98b727beb63c6060356bb177bb7d54b54dbe87aee7353d0a6baa9397704de625d1836d3f42c7ee5683f6703259592cc24b09699376807f28fe0e00ff882974484d805f874260dfc2d1627473b910203010001-----value: 15.0-----time: 2019-01-14 16:18:01.859915-------------------sender:30819f300d06092a864886f70d010101050003818d0030818902818100bb064c99c492144a9f463480273aba93ac1db1f0da3cb9f3c1f9d058cf499fd8e54d244da0a8dd6ddd329ec86794b04d773eb4841c9f935ea4d9ccc2821c7a1082d23b6c928d59863407f52fa05d8b47e5157f8fe56c2ce3279c657f9c6a80500073b0be8093f748aef667c03e64f04f84d311c4d866c12d79d3fc3034563dfb0203010001-----recipient:30819f300d06092a864886f70d010101050003818d0030818902818100a070c82b34ae143cbe59b3a2afde7186e9d5bc274955d8112d87a00256a35369acc4d0edfe65e8f9dc93fbd9ee74b9e7ea12334da38c8c9900e6ced1c4ce93f86e06611e656521a1eab561892b7db0961b4f212d1fd5b5e49ae09cf8c603a068f9b723aa8a651032ff6f24e5de00387e4d062375799742a359b8f22c5362e5650203010001-----value: 6.0-----time: 2019-01-14 16:18:01.860966-------------------sender:30819f300d06092a864886f70d010101050003818d0030818902818100be93b516b28c6e674abe7abdb11ce0fdf5bb728b75216b73f37a6432e4b402b3ad8139b8c0ba541a72c8add126b6e1a1308fb98b727beb63c6060356bb177bb7d54b54dbe87aee7353d0a6baa9397704de625d1836d3f42c7ee5683f6703259592cc24b09699376807f28fe0e00ff882974484d805f874260dfc2d1627473b910203010001-----recipient:30819f300d06092a864886f70d010101050003818d0030818902818100cba097c0854876f41338c62598c658f545182cfa4acebce147aedf328181f9c4930f14498fd03c0af6b0cce25be99452a81df4fa30a53eddbb7bb7b203adf8764a0ccd9db6913a576d68d642d8fd47452590137869c25d9ff83d68ebe6d616056a8425b85b52e69715b8b85ae807b84638d8f00e321b65e4c33acaf6469e18e30203010001-----value: 2.0-----time: 2019-01-14 16:18:01.861958-------------------=====================================block # 2sender:30819f300d06092a864886f70d010101050003818d0030818902818100a070c82b34ae143cbe59b3a2afde7186e9d5bc274955d8112d87a00256a35369acc4d0edfe65e8f9dc93fbd9ee74b9e7ea12334da38c8c9900e6ced1c4ce93f86e06611e656521a1eab561892b7db0961b4f212d1fd5b5e49ae09cf8c603a068f9b723aa8a651032ff6f24e5de00387e4d062375799742a359b8f22c5362e5650203010001-----recipient:30819f300d06092a864886f70d010101050003818d0030818902818100be93b516b28c6e674abe7abdb11ce0fdf5bb728b75216b73f37a6432e4b402b3ad8139b8c0ba541a72c8add126b6e1a1308fb98b727beb63c6060356bb177bb7d54b54dbe87aee7353d0a6baa9397704de625d1836d3f42c7ee5683f6703259592cc24b09699376807f28fe0e00ff882974484d805f874260dfc2d1627473b910203010001-----value: 4.0-----time: 2019-01-14 16:18:01.862946-------------------sender:30819f300d06092a864886f70d010101050003818d0030818902818100cba097c0854876f41338c62598c658f545182cfa4acebce147aedf328181f9c4930f14498fd03c0af6b0cce25be99452a81df4fa30a53eddbb7bb7b203adf8764a0ccd9db6913a576d68d642d8fd47452590137869c25d9ff83d68ebe6d616056a8425b85b52e69715b8b85ae807b84638d8f00e321b65e4c33acaf6469e18e30203010001-----recipient:30819f300d06092a864886f70d010101050003818d0030818902818100a070c82b34ae143cbe59b3a2afde7186e9d5bc274955d8112d87a00256a35369acc4d0edfe65e8f9dc93fbd9ee74b9e7ea12334da38c8c9900e6ced1c4ce93f86e06611e656521a1eab561892b7db0961b4f212d1fd5b5e49ae09cf8c603a068f9b723aa8a651032ff6f24e5de00387e4d062375799742a359b8f22c5362e5650203010001-----value: 7.0-----time: 2019-01-14 16:18:01.863932-------------------sender:30819f300d06092a864886f70d010101050003818d0030818902818100be93b516b28c6e674abe7abdb11ce0fdf5bb728b75216b73f37a6432e4b402b3ad8139b8c0ba541a72c8add126b6e1a1308fb98b727beb63c6060356bb177bb7d54b54dbe87aee7353d0a6baa9397704de625d1836d3f42c7ee5683f6703259592cc24b09699376807f28fe0e00ff882974484d805f874260dfc2d1627473b910203010001-----recipient:30819f300d06092a864886f70d010101050003818d0030818902818100a070c82b34ae143cbe59b3a2afde7186e9d5bc274955d8112d87a00256a35369acc4d0edfe65e8f9dc93fbd9ee74b9e7ea12334da38c8c9900e6ced1c4ce93f86e06611e656521a1eab561892b7db0961b4f212d1fd5b5e49ae09cf8c603a068f9b723aa8a651032ff6f24e5de00387e4d062375799742a359b8f22c5362e5650203010001-----value: 3.0-----time: 2019-01-14 16:18:01.865099-------------------=====================================block # 3sender:30819f300d06092a864886f70d010101050003818d0030818902818100a070c82b34ae143cbe59b3a2afde7186e9d5bc274955d8112d87a00256a35369acc4d0edfe65e8f9dc93fbd9ee74b9e7ea12334da38c8c9900e6ced1c4ce93f86e06611e656521a1eab561892b7db0961b4f212d1fd5b5e49ae09cf8c603a068f9b723aa8a651032ff6f24e5de00387e4d062375799742a359b8f22c5362e5650203010001-----recipient:30819f300d06092a864886f70d010101050003818d0030818902818100bb064c99c492144a9f463480273aba93ac1db1f0da3cb9f3c1f9d058cf499fd8e54d244da0a8dd6ddd329ec86794b04d773eb4841c9f935ea4d9ccc2821c7a1082d23b6c928d59863407f52fa05d8b47e5157f8fe56c2ce3279c657f9c6a80500073b0be8093f748aef667c03e64f04f84d311c4d866c12d79d3fc3034563dfb0203010001-----value: 8.0-----time: 2019-01-14 16:18:01.866219-------------------sender:30819f300d06092a864886f70d010101050003818d0030818902818100a070c82b34ae143cbe59b3a2afde7186e9d5bc274955d8112d87a00256a35369acc4d0edfe65e8f9dc93fbd9ee74b9e7ea12334da38c8c9900e6ced1c4ce93f86e06611e656521a1eab561892b7db0961b4f212d1fd5b5e49ae09cf8c603a068f9b723aa8a651032ff6f24e5de00387e4d062375799742a359b8f22c5362e5650203010001-----recipient:30819f300d06092a864886f70d010101050003818d0030818902818100be93b516b28c6e674abe7abdb11ce0fdf5bb728b75216b73f37a6432e4b402b3ad8139b8c0ba541a72c8add126b6e1a1308fb98b727beb63c6060356bb177bb7d54b54dbe87aee7353d0a6baa9397704de625d1836d3f42c7ee5683f6703259592cc24b09699376807f28fe0e00ff882974484d805f874260dfc2d1627473b910203010001-----value: 1.0-----time: 2019-01-14 16:18:01.867223-------------------sender:30819f300d06092a864886f70d010101050003818d0030818902818100cba097c0854876f41338c62598c658f545182cfa4acebce147aedf328181f9c4930f14498fd03c0af6b0cce25be99452a81df4fa30a53eddbb7bb7b203adf8764a0ccd9db6913a576d68d642d8fd47452590137869c25d9ff83d68ebe6d616056a8425b85b52e69715b8b85ae807b84638d8f00e321b65e4c33acaf6469e18e30203010001-----recipient: 30819f300d06092a864886f70d010101050003818d0030818902818100bb064c99c492144a9f463480273aba93ac1db1f0da3cb9f3c1f9d058cf499fd8e54d244da0a8dd6ddd329ec86794b04d773eb4841c9f935ea4d9ccc2821c7a1082d23b6c928d59863407f52fa05d8b47e5157f8fe56c2ce3279c657f9c6a80500073b0be8093f748aef667c03e64f04f84d311c4d866c12d79d3fc3034563dfb0203010001-----value: 5.0-----time: 2019-01-14 16:18:01.868241-------------------=====================================

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