Try Neurai before mainnet

The signed transaction goes out to the peer-to-peer network. Every node checks its signatures and scripts before relaying it, and keeps it in its mempool: the queue of transactions waiting for a block.

Miners pack transactions from the mempool into a candidate block and hash its header with one nonce after another, until the hash falls below the difficulty target. Mainnet is mined on GPUs with KAWPOW; testnet uses SHA256d at low difficulty, so a node's built-in miner finds blocks even on a CPU.

The winning block points to the previous one by its hash, so changing an old transaction would mean redoing every block after it. Testnet makes a block about every 30 seconds, pays the miner 25,000 XNA plus fees, and Dark Gravity Wave retunes the difficulty at every block.

Deposit XNA or an asset into a privacy pool and it becomes an encrypted note. Payments to tnzk1… addresses hide the amount and both parties: your device builds a zero-knowledge proof, and nodes check only that proof, with OP_ZKVERIFY.