kotlin-blockchain
Kotlin implementation of basic blockchain technology.
Features:
- Data and storage
- Mining and block validation
- Hashing and previous block identification.
Todo:
- Transaction system
- Mining rewards
- Private/Public key system
- Alternate consensus methods
- Secure communication methods
// Creates a new blockchain and initializes it with a "Genesis Block"
val bc = Blockchain(Block("Genesis Block", "", System.currentTimeMillis()))
// Creates a new block to add to the chain.
val block = Block("Hello Blockchain!", bc.blockchain[bc.blockchain.size -1].hash, System.currentTimeMillis())
// Mines block to verify it.
block.mine("00000")
// Adds verified block to the blockchain.
bc.blockchain.add(block)
Example Output:
Creating blockchain with genesis block.
Creating new block.
Block: Data: Hello Blockchain! Previous Hash: c93742f678e8beb33f4b6b80f3a50cabe77513f97081c9fe587d683f3a1cbfa7 Timestamp: 1644266765325
Unverified block hash: 1c85faeed128b7604b9e31257b13a4fbcce03715c200205d983b06bcda8d7705
Attempting to mine block.
Successfully mined block!
Calculating hash took 763541 attempts.
Verified block hash: 000000613e4f6ab796a9c3501a01a734e52634732c85ab59630472aaca992e33
Added verified block to blockchain.
0 Jan 10, 2022
2 Jun 28, 2022
0 Nov 9, 2021
8 Nov 2, 2022
2 Nov 22, 2021
0 Dec 19, 2022
0 Dec 9, 2021
1 Jan 8, 2022
2 Feb 6, 2022
5 Dec 6, 2022
2 Mar 18, 2022
43 Oct 3, 2022
19 Dec 8, 2022
1 Feb 2, 2022
6 Nov 10, 2022
0 Oct 23, 2021
0 Nov 18, 2021
79 Sep 7, 2022