Blockchain + NACHA Demo
Mine blocks, build a chain, and tamper with the data to see how the chain detects it.
Controls
2 leading zeros
About This Demo
This interactive demo shows how blockchain technology can create a tamper-proof ledger for ACH payment data. Each block is cryptographically linked to the previous block using SHA-256 hashing.
Canvas controls: Scroll to zoom, drag empty space to pan, drag blocks to reposition. Use the controls in the bottom-left to zoom or fit the view.
Tamper detection: Click the edit icon on any block, change a value, then hit Validate. The chain will detect the broken hashes.
NACHA/ACH: The fixed-width file format for US electronic payments. The demo uses built-in sample data representing typical ACH payment records.
Chain Explorer
Load payment data and start mining to build your blockchain.
Blockchain
A chain of blocks linked by cryptographic hashes. Changing any block invalidates every block after it.
Mining
Finding a hash with N leading zeros by incrementing a nonce. More zeros = exponentially more work.
NACHA/ACH
The fixed-width file format for US electronic payments. Contains account numbers, amounts, and payee names.
Tamper Detection
Click the edit icon on a block, change a value, then Validate to see the chain break.