Picture of bitcoin price trend in 14 years

1. You can view the three-year trend icons on bitcoin trading platform, such as bitcoin China, fire coin, okcoin

2. Bitcoin used to be synonymous with overnight wealth. In 2017, bitcoin had a record high price, with the highest value of about $20000
according to the data of coindesk digital currency trading platform, the price of bitcoin once fell below US $6000 in 18 years, which has dropped by 70% compared with the highest value of US $20000 in 2017

"the price movements we are seeing now may seem drastic, but they are quite normal for this market." Etiro's senior market analyst, MATI Greenspan, wrote in an email to CNBC

with the decline of bitcoin, most digital currencies are affected, and other digital currencies are not much better. Most digital currencies are down by more than 10%. But in the long run, the future of digital currency is worth looking forward to.

4.

Bitcoin price trend can be understood by looking at the trend chart. First of all, in the long run, bitcoin is at the bottom stage after the decline

from the perspective of investment opportunities, it is a good opportunity to start buying money and then collecting money. Of course, this premise is to be able to stand loneliness and stand the test of time. Tun coin is based on the year

from the perspective of band speculation. There has been a wave of market recently, but it only lasted about a week. Now that the investment window has been missed, the next investment window is expected to drop to $3500 or rise to about $4000 in bitcoin. When the investment window arrives, I (WAN Yuanfu) usually publish it in the group for the first time. Do band also need to have certain technology, this will take time to slowly improve and perception

5. #include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netpacket/packet.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <errno.h>

/* 接收缓冲区大小 */
#define RCV_BUF_SIZE 1024 * 5

/* 接收缓冲区 */
static int g_iRecvBufSize = RCV_BUF_SIZE;
static char g_acRecvBuf[RCV_BUF_SIZE] = {0};

/* 物理网卡接口,需要根据具体情况修改 */
static const char *g_szIfName = "eth1";

/* 以太网帧封装的协议类型 */
static const int g_iEthProId[] = { ETHERTYPE_PUP,
ETHERTYPE_SPRITE,
ETHERTYPE_IP,
ETHERTYPE_ARP,
ETHERTYPE_REVARP,
ETHERTYPE_AT,
ETHERTYPE_AARP,
ETHERTYPE_VLAN,
ETHERTYPE_IPX,
ETHERTYPE_IPV6,
ETHERTYPE_LOOPBACK
};
static const char g_szProName[][24] = {
"none", "xerox pup", "sprite", "ip", "arp",
"rarp", "apple-protocol", "apple-arp",
"802.1q", "ipx", "ipv6", "loopback"
};
/* 输出MAC地址 */
static void ethmp_showMac(const int iType, const char acHWAddr[])
{ int i = 0;
if (0 == iType)
{
printf("SMAC=[");
}
else
{
printf("DMAC=[");
}
for(i = 0; i < ETHER_ADDR_LEN - 1; i++)
{
printf("%02x:", *((unsigned char *)&(acHWAddr[i])));
}
printf("%02x] ", *((unsigned char *)&(acHWAddr[i])));
}
/* 物理网卡混杂模式属性操作 */
static int ethmp_setPromisc(const char *pcIfName, int fd, int iFlags)
{ int iRet = -1;
struct ifreq stIfr;
/* 获取接口属性标志位 */
strcpy(stIfr.ifr_name, pcIfName);
iRet = ioctl(fd, SIOCGIFFLAGS, &stIfr);
if (0 > iRet)
{ perror("[Error]Get Interface Flags");
return -1;
}
if (0 == iFlags)
{ /* 取消混杂模式 */
stIfr.ifr_flags &= ~IFF_PROMISC;
}
else
{ /* 设置为混杂模式 */
stIfr.ifr_flags |= IFF_PROMISC;
}
iRet = ioctl(fd, SIOCSIFFLAGS, &stIfr);
if (0 > iRet)
{ perror("[Error]Set Interface Flags");
return -1;
}
return 0;
}
/* 获取L2帧封装的协议类型 */
static char *ethmp_getProName(const int iProNum)
{ int iIndex = 0;
for(iIndex = 0; iIndex < sizeof(g_iEthProId) / sizeof(g_iEthProId[0]); iIndex++)
{ if (iProNum == g_iEthProId[iIndex])
{
break;
}
}
return (char *)(g_szProName[iIndex + 1]);
}
/* Init L2 Socket */
static int ethmp_initSocket()
{ int iRet = -1;
int fd = -1;
struct ifreq stIf;
struct sockaddr_ll stLocal = {0};
/* 创建SOCKET */
fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (0 > fd)
{ perror("[Error]Initinate L2 raw socket");
return -1;
}
/* 网卡混杂模式设置 */
ethmp_setPromisc(g_szIfName, fd, 1);
/* 设置SOCKET选项 */
iRet = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &g_iRecvBufSize,sizeof(int));
if (0 > iRet)
{ perror("[Error]Set socket option");
close(fd);
return -1;
}
/* 获取物理网卡接口索引 */
strcpy(stIf.ifr_name, g_szIfName);
iRet = ioctl(fd, SIOCGIFINDEX, &stIf);
if (0 > iRet)
{ perror("[Error]Ioctl operation");
close(fd);
return -1;
}
/* 绑定物理网卡 */
stLocal.sll_family = PF_PACKET;
stLocal.sll_ifindex = stIf.ifr_ifindex;
stLocal.sll_protocol = htons(ETH_P_ALL);
iRet = bind(fd, (struct sockaddr *)&stLocal, sizeof(stLocal));
if (0 > iRet)
{ perror("[Error]Bind the interface");
close(fd);
return -1;
}
return fd;
}
/* 解析Ethernet帧首部 */
static int ethmp_parseEthHead(const struct ether_header *pstEthHead)
{ unsigned short usEthPktType;
if (NULL == pstEthHead)
{ return -1;}
/* 协议类型、源MAC、目的MAC */
usEthPktType = ntohs(pstEthHead->ether_type);
printf(">>>\nEth-Pkt-Type:0x%04x(%s) ", usEthPktType, ethmp_getProName(usEthPktType));
ethmp_showMac(0, pstEthHead->ether_shost);
ethmp_showMac(1, pstEthHead->ether_dhost);
return 0;
}
/* 解析IP数据包头 */
static int ethmp_parseIpHead(const struct ip *pstIpHead)
{ struct protoent *pstIpProto = NULL;
if (NULL == pstIpHead)
{ return -1;}
/* 协议类型、源IP地址、目的IP地址 */
pstIpProto = getprotobynumber(pstIpHead->ip_p);
if(NULL != pstIpProto)
{ printf("\nIP-Pkt-Type:%d(%s) ", pstIpHead->ip_p, pstIpProto->p_name); }
else
{ printf("\nIP-Pkt-Type:%d(%s) ", pstIpHead->ip_p, "None");}
printf("SAddr=[%s] ", inet_ntoa(pstIpHead->ip_src));
printf("DAddr=[%s]\n", inet_ntoa(pstIpHead->ip_dst));
return 0;
}
/* 数据帧解析函数 */
static int ethmp_parseFrame(const char *pcFrameData)
{ int iRet = -1;
struct ether_header *pstEthHead = NULL;
struct ip *pstIpHead = NULL;
/* Ethnet帧头解析 */
pstEthHead = (struct ether_header*)g_acRecvBuf;
iRet = ethmp_parseEthHead(pstEthHead);
if (0 > iRet)
{ return iRet;}
/* IP数据包类型 */
pstIpHead = (struct ip *)(pstEthHead + 1);
iRet = ethmp_parseIpHead(pstIpHead);
return iRet;
}
/* 捕获网卡数据帧 */
static void ethmp_startCapture(const int fd)
{ int iRet = -1;
socklen_t stFromLen = 0;
/* 循环监听 */
while(1)
{ /* 清空接收缓冲区 */
memset(g_acRecvBuf, 0, RCV_BUF_SIZE);
/* 接收数据帧 */
iRet = recvfrom(fd, g_acRecvBuf, g_iRecvBufSize, 0, NULL, &stFromLen);
if (0 > iRet)
{ continue;}
/* 解析数据帧 */
ethmp_parseFrame(g_acRecvBuf);
}
}
/* Main */
int main(int argc, char *argv[])
{ int iRet = -1;
int fd = -1;
/* 初始化SOCKET */
fd = ethmp_initSocket();
if(0 > fd) {
return -1;
}
/* 捕获数据包 */
ethmp_startCapture(fd);
/* 关闭SOCKET */
close(fd);
return 0;
}
编译命令
gcc -o a a.c
./a
实现效果图

...

>>>Eth-Pkt-Type:0x0800(ip) SMAC=[00:1a:92:ef:b6:dd] DMAC=[00:24:7e:dc:99:18] IP-Pkt-Type:6(tcp) SAddr=[192.168.0.111] DAddr=[192.168.0.100]
>>> Eth-Pkt-Type:0x0800(ip) SMAC=[00:24:7e:dc:99:18] DMAC=[00:1a:92:ef:b6:dd] IP-Pkt-Type:6(tcp) SAddr=[192.168.0.100] DAddr=[192.168.0.111]
>>> Eth-Pkt-Type:0x0800(ip) SMAC=[00:24:7e:dc:99:18] DMAC=[00:1a:92:ef:b6:dd] IP-Pkt-Type:1(icmp) SAddr=[192.168.0.100] DAddr=[192.168.0.111]
>>> Eth-Pkt-Type:0x0800(ip) SMAC=[00:1a:92:ef:b6:dd] DMAC=[00:24:7e:dc:99:18] IP-Pkt-Type:1(icmp) SAddr=[192.168.0.111] DAddr=[192.168.0.100]
>>> Eth-Pkt-Type:0x0800(ip) SMAC=[00:1a:92:ef:b6:dd] DMAC=[00:24:7e:dc:99:18] IP-Pkt-Type:6(tcp) SAddr=[192.168.0.111] DAddr=[192.168.0.100]

...

6.

Fake

according to the survey, the predecessor of "global Expo" is "global view", which is led by 8 users of the original global view. The core person of the team is Mr. Chen, who is from Shaoyang City, Hunan Province. Users use RMB 1.5 to register their pass, and the platform will give you a "novice reading bag" to watch news for 3 minutes every day. The "novice reading bag" will proce 0.385 "GT" every day, and you will get an "advanced reading bag" after 30 days

According to the instry insiders, Chen Fenglin, one of the founders, plans to earn 100 million yuan by the end of July. Nowadays, the platform is issuing a large number of bills and coins. Most of the team leaders do not buy coins themselves. They only teach and ask the people in the team to buy coins

different from the previous pyramid schemes, the national Expo has used some big concepts and new terms, such as "GT" for virtual currency and "flow" for revenue; In essence, it is nothing more than luring people who do not know the truth to be deceived by investment and high profits. Everyone has a blind spot of knowledge. Not all scams can be detected and prevented. If the platform to see the news to send GT, people unconsciously fall into the "Urn"

extended data

Global watch 1.0 was attacked by hackers on December 27, 2019, and then it was maintained indefinitely, that is, running and cutting countless leeks. Recently, a so-called "global watch 2.0" project started, and the model almost changed

it is understood that "global watch 2.0" app is known as the world's first public information app, which gives token GC reward in the process of reading information, so as to achieve revenue. From the beginning, 2.0 model takes money as the primary goal, and the registration fee is 1.5 yuan

in addition, global watch 2.0 also plays hunger marketing, which requires everyone to grab orders every day. The online official directly releases 300000 coins at a time, and the starting price of one coin is 10 yuan, which only goes up but does not go down. The obvious thing is to let leeks take over

7. At the end of May, bitcoin hit a new high this year after a sustained surge. It began to reverse on May 25 and 26, with a sharp drop of $900, or more than 30%; China's bitcoin price also fell back to about 14000 yuan, and fluctuated around 14700 yuan today. Interestingly, the reporter noticed that the exchange rate of RMB away from the onshore market is rising

9.

Bitcoin was born in January 2009, on November 29, 2017, the price of bitcoin exceeded US $10000 for the first time , with a market value of nearly US $170 billion, and climbed to an all-time high of US $20000 on December 19. Since then, bitcoin prices have fluctuated sharply. In March 2018, the price of bitcoin fell below US $10000 and dropped below US $4000 at the end of the year

in April 2019, the price of bitcoin went up all the way , climbed to above $12000 in July, recovered to below $10000 at the end of August, fell below $8000 in late September, and then fluctuated between $7000 and $9000

since 2020, the price of bitcoin has broken through the 10000 yuan mark in February, then dropped below US $4000 in the next month, and has been above US $10000 since August< in the morning of November 6, the price of bitcoin was close to US $16000 , and the unit price had exceeded RMB 100000, up 12% in 24 hours. Compared with the lowest price in March 2020, the price of bitcoin has increased by nearly 300%

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extended data

bitcoin has a strong scarcity:

unlike all currencies, bitcoin does not rely on a specific monetary institution to issue, it is based on a specific algorithm, through a large number of calculations, Bitcoin economy uses the distributed database composed of many nodes in the whole P2P network to confirm and record all transactions, and uses the design of cryptography to ensure the security of all aspects of money circulation

the decentralized feature and algorithm of P2P can ensure that it is impossible to artificially control the value of bitcoin by mass manufacturing. The design based on cryptography can make bitcoin only be transferred or paid by the real owner. This also ensures the anonymity of money ownership and circulation transactions. The biggest difference between bitcoin and other virtual currencies is that the total amount of bitcoin is very limited and it has a strong scarcity

10. Use this to see the bitcoin market. Not bad< br />