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Sep 11, 2018 Anybody can create any number of addresses (accounts) for themselves out of thin air. They can even do this on a piece of paper. Scientists create a 'Star Trek'-style replicator. Capable of materializing objects out of thin air, this replicator is as close to magic as it gets. Replicators are the latest 'Star Trek' technology that might soon be realized. Essentially, the Air-gen can generate a flow of electrons without much input, thanks to the impressive biology of Geobacter’s nanowires.Co-author and distinguished microbiology professor Derek Lovley, who has dedicated more than 30 years of study to the electric microbe, compares the wires to individual human hairs — a thread made up of different proteins, only 20,000 times. Out Of Thin Air is built around interviews with the key characters and evocative reconstructions that are interweaved with pictures and archive from the 1970s. The factual format deceives the viewer into taking the reconstructions at face value.
| importorg.bouncycastle.jce.provider.BouncyCastleProvider; |
| importjava.math.BigInteger; |
| importjava.security.*; |
| publicclassMain { |
| publicstaticvoidmain(String[] args) throwsNoSuchProviderException, NoSuchAlgorithmException, InvalidKeyException, SignatureException { |
| // Crypto setup |
| // You need the following JAR for RSA http://www.bouncycastle.org/download/bcprov-jdk15on-156.jar |
| // More information https://en.wikipedia.org/wiki/Bouncy_Castle_(cryptography) |
| Security.addProvider(newBouncyCastleProvider()); |
| KeyPairGenerator keyGen =KeyPairGenerator.getInstance('RSA'); |
| SecureRandom random =SecureRandom.getInstance('SHA1PRNG', 'SUN'); |
| keyGen.initialize(1024, random); |
| // Generating two key pairs, one for Scrooge and one for Alice |
| KeyPair pair = keyGen.generateKeyPair(); |
| PrivateKey private_key_scrooge = pair.getPrivate(); |
| PublicKey public_key_scrooge = pair.getPublic(); |
| pair = keyGen.generateKeyPair(); |
| PrivateKey private_key_alice = pair.getPrivate(); |
| PublicKey public_key_alice = pair.getPublic(); |
| // START - ROOT TRANSACTION |
| // Generating a root transaction tx out of thin air, so that Scrooge owns a coin of value 10 |
| // By thin air I mean that this tx will not be validated, I just need it to get a proper Transaction.Output |
| // which I then can put in the UTXOPool, which will be passed to the TXHandler |
| Transaction tx =newTransaction(); |
| tx.addOutput(10, public_key_scrooge); |
| // that value has no meaning, but tx.getRawDataToSign(0) will access in.prevTxHash; |
| byte[] initialHash =BigInteger.valueOf(1695609641).toByteArray(); |
| tx.addInput(initialHash, 0); |
| Signature signature =Signature.getInstance('SHA256withRSA'); |
| signature.initSign(private_key_scrooge); |
| signature.update(tx.getRawDataToSign(0)); |
| byte[] sig = signature.sign(); |
| tx.addSignature(sig, 0); |
| tx.finalize(); |
| // END - ROOT TRANSACTION |
| // The transaction output of the root transaction is unspent output |
| UTXOPool utxoPool =newUTXOPool(); |
| UTXO utxo =newUTXO(tx.getHash(),0); |
| utxoPool.addUTXO(utxo, tx.getOutput(0)); |
| // START - PROPER TRANSACTION |
| Transaction tx2 =newTransaction(); |
| // the Transaction.Output of tx at position 0 has a value of 10 |
| tx2.addInput(tx.getHash(), 0); |
| // I split the coin of value 10 into 3 coins and send all of them for simplicity to the same address (Alice) |
| tx2.addOutput(5, public_key_alice); |
| tx2.addOutput(3, public_key_alice); |
| tx2.addOutput(2, public_key_alice); |
| // There is only one (at position 0) Transaction.Input in tx2 |
| // and it contains the coin from Scrooge, therefore I have to sign with the private key from Scrooge |
| signature.initSign(private_key_scrooge); |
| signature.update(tx2.getRawDataToSign(0)); |
| sig = signature.sign(); |
| tx2.addSignature(sig, 0); |
| tx2.finalize(); |
| // remember that the utxoPool contains a single unspent Transaction.Output which is the coin from Scrooge |
| TxHandler txHandler =newTxHandler(utxoPool); |
| System.out.print(txHandler.isValidTx(tx2)); |
| System.out.print(txHandler.handleTxs(newTransaction[]{tx2}).length); |
| } |
| } |
Out Of Thin Air Definition
commented Jan 22, 2017 • edited
edited
Thank you very much, Sven! this example very helpful for understanding the mechanics of ScroogeCoin |