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CVM Performance Test: scrypt
c.verifyBlock.call(1, "82bc68038f6034c0596b6e313729793a887fded6e92a31fbdf70863f89d9bea2", "3b14b76d22a3f2859d73316002bc1b9bfc7f37e2c3393be9b722b62bbd786983", 1386474933, "1e0ffff0", 3404207872)
abi = [{"constant":true,"inputs":[{"name":"version","type":"uint256"},{"name":"prev_block","type":"string"},{"name":"merkle_root","type":"string"},{"name":"timestamp","type":"uint256"},{"name":"bits","type":"string"},{"name":"nonce","type":"uint256"}],"name":"verifyBlock","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"pure","type":"function"}];
bytecode = 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contract = web3.cmt.contract(abi);
c = contract.new(
{
from: web3.cmt.accounts[0],
data: bytecode,
gas: "4700000"
},
function(e, contract) {
console.log("contract address: " + contract.address);
console.log("transactionHash: " + contract.transactionHash);
}
);
pragma solidity ^0.4.23;
contract DogecoinVerifier {
struct DogecoinBlockHeader {
uint version;
string prev_block;
string merkle_root;
uint timestamp;
string bits;
uint nonce;
}
function verifyBlock(uint version, string prev_block, string merkle_root, uint timestamp, string bits, uint nonce) pure public returns (bool) {
DogecoinBlockHeader memory block_header = DogecoinBlockHeader(version, prev_block, merkle_root, timestamp, bits, nonce);
string memory block_header_hex = generateBlockHeader(block_header);
string memory pow_hash = reverseHex(eni("scrypt", block_header_hex));
uint256 target = bitsToTarget(bits);
if (hexToUint(pow_hash) > target) {
return false;
}
return true;
}
function generateBlockHeader(DogecoinBlockHeader header) pure internal returns (string) {
bytes memory block_header = new bytes(160);
bytes memory version_hex = bytes(reverseHex(uintToHex(header.version, 8)));
bytes memory prev_block_hex = bytes(reverseHex(header.prev_block));
bytes memory merkle_root_hex = bytes(reverseHex(header.merkle_root));
bytes memory timestamp_hex = bytes(reverseHex(uintToHex(header.timestamp, 8)));
bytes memory bits_hex = bytes(reverseHex(header.bits));
bytes memory nonce_hex = bytes(reverseHex(uintToHex(header.nonce, 8)));
uint i;
uint index = 0;
for (i = 0; i < version_hex.length; i++) { block_header[index++] = version_hex[i]; }
for (i = 0; i < prev_block_hex.length; i++) { block_header[index++] = prev_block_hex[i]; }
for (i = 0; i < merkle_root_hex.length; i++) { block_header[index++] = merkle_root_hex[i]; }
for (i = 0; i < timestamp_hex.length; i++) { block_header[index++] = timestamp_hex[i]; }
for (i = 0; i < bits_hex.length; i++) { block_header[index++] = bits_hex[i]; }
for (i = 0; i < nonce_hex.length; i++) { block_header[index++] = nonce_hex[i]; }
return string(block_header);
}
function bitsToTarget(string bits) pure internal returns (uint) {
uint bits_uint32 = hexToUint(bits);
uint p = (bits_uint32 & 0xff000000) >> 24;
p = (p - 3) * 8;
uint result = (bits_uint32 & 0xffffff) << p;
return result;
}
function reverseHex(string hex_string) pure internal returns (string) {
bytes memory hex_bytes = bytes(hex_string);
assert(hex_bytes.length % 2 == 0);
bytes memory outpute_bytes = new bytes(hex_bytes.length);
for (uint i = 0; i < hex_bytes.length; i += 2) {
outpute_bytes[i] = hex_bytes[hex_bytes.length - i - 2];
outpute_bytes[i + 1] = hex_bytes[hex_bytes.length - i - 1];
}
return string(outpute_bytes);
}
function hexToUint(string hex_string) pure internal returns (uint256) {
bytes memory hex_bytes = bytes(hex_string);
uint i;
uint256 result = 0;
for (i = 0; i < hex_bytes.length; i++) {
result <<= 4;
if (uint8(hex_bytes[i]) >= uint8(byte('0')) && uint8(hex_bytes[i]) <= uint8(byte('9'))) {
result += uint8(hex_bytes[i]) - uint8(byte('0'));
} else {
result += uint8(hex_bytes[i]) - uint8(byte('a')) + 10;
}
}
return result;
}
function uintToHex(uint256 a, uint8 length) pure internal returns (string) {
uint i;
bytes memory hex_bytes = new bytes(64);
for (i = 0; i < 64; i++) {
byte last_half_byte = byte(a & 0xf);
if (last_half_byte >= 0 && last_half_byte <= 9) {
hex_bytes[63 - i] = byte(uint8(byte('0')) + uint8(last_half_byte));
} else {
hex_bytes[63 - i] = byte(uint8(byte('a')) + uint8(last_half_byte) - 10);
}
a >>= 4;
}
bytes memory output_bytes = new bytes(length);
for (i = 0; i < length; i++) {
output_bytes[i] = hex_bytes[64 - length + i];
}
return string(output_bytes);
}
}
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