Python Blockchain

A simple transactional blockchain implemented in python

Support ❤️

If you find the project useful, please consider supporting, or contributing.

Methodology

The blockchain consists of blocks represented by class objects. Each object has inherit values visible in the examples. Before mining a block, the hash of the previously mined block is added to the current block to establish the chain. Each block's hash has to start with a certain number of zero hex values in order to be considered valid. This is achieved through trial and error by iterating the proof variable.

Usage Example

from blockchain import Blockchain

bc = Blockchain(5) # Complexity
bc.add({'from': 'user1', 'to': 'user2', 'amount': 122.85})
bc.add({'from': 'user2', 'to': 'user1', 'amount': 4.99})
print(bc.validate())
bc.print()

Example Blockchain

{
   Hash: 5aae8d94cf30107802641bb3f44483a6740900be133410425996f5106572ac34
   Prev:
   Time: 2022-05-12 02:29:17.928376
   Data: None
   Prof: 0
   Comp: 3
}
{
   Hash: 00038eceacbfad7d8c55116c6bf1c23c09196b61645a1c190c274c610c0cc0a3
   Prev: 5aae8d94cf30107802641bb3f44483a6740900be133410425996f5106572ac34
   Time: 2022-05-12 02:29:17.928376
   Data: None
   Prof: 151
   Comp: 3
}
{
   Hash: 0003c46ac8f27e17ec8110a0a90e56236ef5746a99d0c71dec6353ac86eb7809
   Prev: 00038eceacbfad7d8c55116c6bf1c23c09196b61645a1c190c274c610c0cc0a3
   Time: 2022-05-12 02:29:17.928376
   Data: heyo
   Prof: 977
   Comp: 3
}
{
   Hash: 000aa2be0eebbd3964c26daba9ba6e8a34e25ff82dac516e959582030ad9a3e4
   Prev: 0003c46ac8f27e17ec8110a0a90e56236ef5746a99d0c71dec6353ac86eb7809
   Time: 2022-05-12 02:29:17.928376
   Data: 2
   Prof: 12991
   Comp: 3
}
{
   Hash: 00021d76b6b34f021a98618d8a958606d0dd84ec9cd5567db1270624db7237b4
   Prev: 000aa2be0eebbd3964c26daba9ba6e8a34e25ff82dac516e959582030ad9a3e4
   Time: 2022-05-12 02:29:17.928376
   Data: {'a': True}
   Prof: 740
   Comp: 3
}