文件列表:

LICENSE (1097, 2022-04-16)
assembler (0, 2022-04-16)
assembler\index.js (1568, 2022-04-16)
assembler\opcode.js (3419, 2022-04-16)
contracts (0, 2022-04-16)
contracts\TheDivine.asm (223, 2022-04-16)

# The Divine A smart contract that allowed us to generate and secure pseudo-random numbers for the lowest cost. All processes and algorithms are transparent and open to everyone. The algorithm is thus safe and acceptable for a wide range of PRNG applications and situations where the cost to manipulate outweigh the transaction value. ## Disclaimer Do not use this algorithm in gambling and/or use it at your own risk. Do not use this algorithm in cryptography. We highly recommend it as an extra salt to improve your random result. # What is the idea behind it? ## The idea We get `blockhash` of 32nd older blocks from blockchain and combine with `immortal` by using `xor` operator then calculate its digest by using `keccak256` hash function. The new `immortal` value will be assigned with the given digest from the above step. ``` immortal <- blockchain state currentBlock <- blockchain state immortal <- keccak256(blockhash(currentBlock - 32) xor immortal) return immortal ``` We restrict the normal account to trigger this smart contract to prevent manipulation, the only way to trigger it is through a deployed smart contract. As long as there are many users of The Divine we could able to maintain an immortal chain of entropy. ## Implementation EVM assembly ```asm 60 PUSH1 0x20 ; [0x20] 3d RETURNDATASIZE ; [0x00, 0x20] 33 CALLER ; [msg.sender, 0x00, 0x20] 32 ORIGIN ; [tx.origin, msg.sender, 0x00, 0x20] 18 XOR ; [tx.origin xor msg.sender, 0x00, 0x20] 60 PUSH1 0x0a ; [jumpdest, tx.origin xor msg.sender, 0x00, 0x20] 57 JUMPI ; [0x00, 0x20] fd REVERT ; We do revert(0x00, 0x20), if tx.origin == msg.sender 5b JUMPDEST ; [0x00, 0x20] 81 DUP2 ; [0x20, 0x00, 0x20] 81 DUP2 ; [0x00, 0x20, 0x00, 0x20] 80 DUP1 ; [0x00, 0x00, 0x20, 0x00, 0x20] 54 SLOAD ; [immortal, 0x00, 0x20, 0x00, 0x20] 82 DUP3 ; [0x20, immortal, 0x00, 0x20, 0x00, 0x20] 43 NUMBER ; [block.number, 0x20, immortal, 0x00, 0x20, 0x00, 0x20] 03 SUB ; [block.number - 0x20, immortal, 0x00, 0x20, 0x00, 0x20] 40 BLOCKHASH ; [blockhash, immortal, 0x00, 0x20, 0x00, 0x20] 18 XOR ; [blockhash xor immortal, 0x00, 0x20, 0x00, 0x20] 81 DUP2 ; [0x00, blockhash xor immortal, 0x00, 0x20, 0x00, 0x20] 52 MSTORE ; [0x00, 0x20, 0x00, 0x20] 20 SHA3 ; [sha3(blockhash xor immortal), 0x00, 0x20] 81 DUP2 ; [0x00, sha3(blockhash xor immortal), 0x00, 0x20] 55 SSTORE ; [0x00, 0x20] f3 RETURN ; [] ``` Opcode: ``` 0x60203d333218600a57fd5b8181805482430340188152208155f3 ``` # Deployment ## Compile opcode I wrote my assembler, you would try and get the same result: ``` $ node ./assembler/index.js 60 PUSH1 0x20 3d RETURNDATASIZE 33 CALLER 32 ORIGIN 18 XOR 60 PUSH1 0x0a 57 JUMPI fd REVERT 5b JUMPDEST 81 DUP2 81 DUP2 80 DUP1 54 SLOAD 82 DUP3 43 NUMBER 03 SUB 40 BLOCKHASH 18 XOR 81 DUP2 52 MSTORE 20 SHA3 81 DUP2 55 SSTORE f3 RETURN Output: 60203d333218600a57fd5b8181805482430340188152208155f3 Tx deploy data: 601a803d90600a8239f360203d333218600a57fd5b8181805482430340188152208155f3 ``` ## Ethereum The Divine was deployed in [0xb2e8610f3c8710c07965f1de7d72345011c8be3b4bdfa***23168017d180754ac](https://etherscan.io/tx/0xb2e8610f3c8710c07965f1de7d72345011c8be3b4bdfa***23168017d180754ac) at [0xb7E5468671dEDaf316B73494B9bE73a5aDbA1cdf](https://etherscan.io/address/0xb7E5468671dEDaf316B73494B9bE73a5aDbA1cdf#code) ## Fantom The Divine was deployed in [0xe75b31f4bb2a837fe951597458cdc99480b973e5c32500f2eb7b63dc9f5a8fce](https://ftmscan.com/tx/0xe75b31f4bb2a837fe951597458cdc99480b973e5c32500f2eb7b63dc9f5a8fce) at [0x4B9fd51e5D6E6935635940532d1C5F0B11235630](https://ftmscan.com/address/0x4B9fd51e5D6E6935635940532d1C5F0B11235630#code) ## Binance Smart Chain The Divine was deployed in [0x73ca699adfe8ae9204dbe299ae2c1492f09999e51950df5278bf3a9f01***cb1a](https://bscscan.com/tx/0x73ca699adfe8ae9204dbe299ae2c1492f09999e51950df5278bf3a9f01***cb1a) at [0xF52a83a3B7d918B66BD9ae117519ddC436A82031](https://bscscan.com/address/0xF52a83a3B7d918B66BD9ae117519ddC436A82031#code) ## Polygon The Divine was deployed in [0x7475de6549e9d4bd717f18972dcd1c57fea36d94cb5607a66ca92f33515f863a](https://polygonscan.com/tx/0x7475de6549e9d4bd717f18972dcd1c57fea36d94cb5607a66ca92f33515f863a) at [0x8F2F05d2A036C9AE279B333CAE12c9eC79f6C553](https://polygonscan.com/address/0x8f2f05d2a036c9ae279b333cae12c9ec79f6c553#code) ## Rinkeby The Divine was deployed in [0x28881447f735195e05546946c9cd404f0a194e94232a3a432f090ac5777adb19](https://rinkeby.etherscan.io/tx/0x28881447f735195e05546946c9cd404f0a194e94232a3a432f090ac5777adb19) at [0x6***07cbCa149B58772F0732DcB820C268c5c6093](https://rinkeby.etherscan.io/address/0x6***07cbca149b58772f0732dcb820c268c5c6093#code) Data is: ``` 0x601a803d90600a8239f360203d333218600a57fd5b8181805482430340188152208155f3 ``` ## What is `601a803d90600a8239f3` ? This is code that was optimized to deploy a smart contract. ```asm 0000 60 PUSH1 0x1a ; [divineCode.length] 0002 80 DUP1 ; [divineCode.length, divineCode.length] 0003 3D RETURNDATASIZE ; [0x00, divineCode.length, divineCode.length] 0004 90 SWAP1 ; [divineCode.length, 0x00, divineCode.length] 0005 60 PUSH1 0x0a ; [0x0a, divineCode.length, 0x00, divineCode.length] 0007 82 DUP3 ; [0x00, 0x0a, divineCode.length, 0x00, divineCode.length] 0008 39 CODECOPY ; [0x00, divineCode.length] 0009 F3 *RETURN ; [] ``` It will return a pointer to `memory[divineCode.offset:divineCode.length]` # How to use TheDivine? **Usage:** - Ethereum Mainnet: ``` 0xb7E5468671dEDaf316B73494B9bE73a5aDbA1cdf ``` - Fantom: ``` 0x4B9fd51e5D6E6935635940532d1C5F0B11235630 ``` - Binance Smart Chain: ``` 0xF52a83a3B7d918B66BD9ae117519ddC436A82031 ``` - Polygon: ``` 0x8F2F05d2A036C9AE279B333CAE12c9eC79f6C553 ``` ```solidity // SPDX-License-Identifier: MIT pragma solidity >=0.7.5 <0.9.0; interface TheDivine { function rand() external returns(uint256); } contract TestTheDivine{ event Log(uint256 indexed _value); function testRand() public { emit Log(TheDivine(0xb7E5468671dEDaf316B73494B9bE73a5aDbA1cdf).rand()); } } ``` Gas cost is around `5190 Gas` each call. # Testing - Testing transaction on Binance Smart Chain: [0xf3b4e1a032904c61c617ec365e9c288d2e1fb8095f12***708974e14d4def2b1b](https://bscscan.com/tx/0xf3b4e1a032904c61c617ec365e9c288d2e1fb8095f12***708974e14d4def2b1b#eventlog) # Reference [A Pseudorandom Number Generator with KECCAK Hash Function ](http://www.ijcee.org/papers/439-JE503.pdf) # License This software distributed under [MIT License](https://github.com/chiro-hiro/thedivine/blob/master/LICENSE)

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