BTC broadcast test host
To connect Bluetooth, you need to find the name of Bluetooth, click and match to connect successfully. As for btc-030, it is the model of Bluetooth headset. The name of Bluetooth is in the connection. Click the Bluetooth name to match. If the match is successful, the connection is successful
when Bluetooth headset is connected to FM, Bluetooth function must be turned on for both devices. Btc-030 displayed on FM is the name of Bluetooth headset to be connected. Generally, the Bluetooth name of Bluetooth headset is its own model, so you only need to click connect at this time
extended information :
1. The mobile phone can't find the Bluetooth headset:
possible reasons and solutions:
1. The Bluetooth headset is not in the pairing state. Solution: after the Bluetooth headset is turned off, long press the JetBlue Bluetooth multifunction key (i.e. red and blue lights flash alternately) to activate Bluetooth pairing
2, Bluetooth headset program error. Solution: restore the Bluetooth headset to the factory settings
3, Bluetooth program error. Solution: after the mobile phone is restarted, all pairing data stored in the Bluetooth of the mobile phone will be cleared; Search Bluetooth again
2. Common problems and solutions in the use of Bluetooth connection:
1. Bluetooth headset can not be charged: if it is idle for a long time, it takes about 20 minutes to activate the battery of Bluetooth headset. One of the Bluetooth headset or charger has been damaged. You can connect it with the intact device respectively and find out the problem after testing
2. Bluetooth headset can't be paired with mobile phone: please confirm whether the operation steps are correct. Bluetooth headset is not compatible with mobile phone. For example, a mobile phone with Bluetooth version 1.1 cannot be connected to a headset with Bluetooth version 2.0
3. The Bluetooth headset is always disconnected after connecting with the mobile phone: the power of the Bluetooth headset is exhausted, and the Bluetooth headset needs to be charged as soon as possible. The compatibility between Bluetooth headset and mobile phone is not very good. The Bluetooth signal transmitted by mobile phone can not be received by the headset. Once there is a barrier between the headset and mobile phone or the distance is a little longer, the headset will automatically disconnect from the mobile phone, and then automatically shut down
4. Bluetooth headset can't listen to music: at present, many new mobile phones can only support stereo Bluetooth headset, which has built-in A2DP function. If you still use one ear headset, you can't listen to songs on your mobile phone. For example, Samsung's series of new mobile phones. The Bluetooth version of the mobile phone is relatively low and does not support Bluetooth audio transmission. Basically, the mobile phones before 2005 didn't use Bluetooth to listen to music
some mobile phones can listen to music with mono or binaural stereo Bluetooth headset, but they can hear mono music. For example, Nokia's 7610 / N70 and other mobile phones can realize stereo function by adding Bluetooth player
5. Service life of Bluetooth headset: the service life of original Bluetooth headset can reach more than 500 times of repeated charging, and some excellent procts can even reach more than 700 times of repeated charging. The quality of high imitation Bluetooth earphones in China is different. Generally, the earphones proced by factories with better quality can be recharged about 300 times. If it's from a fake factory, it won't take long for the battery to be scrapped
How to identify high imitation and original Bluetooth headset: put the headset on your left ear, cover it with your hand, and then put the mobile phone behind your body to make a call. This is equivalent to two artificial barriers between the headset and the mobile phone. If the call effect is OK, the headset is original. Of course, this should be based on the premise of good compatibility between headphones and mobile phonesin general, there will be no signal in high imitation headphones immediately, and some original headphones will have obvious noise
pass the distance test. Put on the earphone and walk about 5 meters away from the mobile phone. If there is no noise or only slight noise in the call, it proves that the earphone is original. If you walk 2 or 3 meters away, the noise is very obvious, and you can't even answer or make calls when you walk around, it's undoubtedly an imitation
7. How to use Bluetooth headset to listen to music and chat on the computer: Bluetooth headset can not only be used on the mobile phone, but also can listen to music and chat on the computer. First of all, a Bluetooth adapter should be equipped. The adapter is used to connect the Bluetooth headset with the computer
blockchain has rich application scenarios
blockchain is essentially a decentralized database, which is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies. Blockchain can solve the problem of information asymmetry and realize the cooperative trust and concerted action among multiple agents, which has a wide range of application scenarios
-- for more data, please refer to the analysis report on market prospect and investment strategic planning of China's blockchain instry issued by foresight Instry Research Institute
bitcoin is actually a useless string of numbers, but it is recognized as useful, just like diamonds, antiques, calligraphy and paintings, game skin and so on. They can't be eaten or used, but we will recognize their value
"mining" just allows more people to participate in the construction of blockchain network. Is it really good that so many electricity charges are used to "calculate" a series of virtual values? Bitcoin is not a hedge. The price of bitcoin fluctuates greatly. Speculation on bitcoin may become rich overnight or become poor overnight. Bitcoin is not as safe as it claims. In 2014, the world's largest bitcoin trading website, mtgox, was hacked and went bankrupt, and the $467 million worth of bitcoin evaporated instantly. Criminals use it to launder money, evade taxes and so on. It is also quite difficult for the government to investigate. The above personal opinions are welcome to be criticized and corrected. Agree with me, please click like before you go, thank you! Like me, please pay attention to me, thank you again
only full node clients like bitcoin core need longer synchronization time. Technically, synchronization is a process of downloading and verifying all previous bitcoin transactions on the network. Some bitcoin clients need to know all previous transactions to calculate the available balance of your bitcoin wallet and complete new transactions. This step consumes a lot of resources and needs enough bandwidth and space to store the whole block chain. In order to maintain the security of bitcoin, enough users need to use the full node client, because they play the role of confirmation and relay transactions.
Two statements for reference are found from Babbitt:
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bitcoin adopts a mathematical contest to determine the time when a transaction arrives at a node, and at the same time to protect this order. In bitcoin system, transactions are sorted by group allocation, Such groups are called blocks (transactions occurring at the same time will be divided into the same block), and then these blocks are linked together, which is called blockchain. Blockchain is used to sort transactions, while the transaction chain tracks and records the change of bitcoin ownership. These blocks are arranged according to time, which is a link. Transactions not in the block are called unconfirmed or unsorted transactions, and any node is about to put a group of unconfirmed transactions into the block, Then broadcast their suggestions about what the next block should be to other nodes in the network
If multiple people generate blocks at the same time (the probability is very small), there will be multiple choices for the next block of the current block. In order to ensure the sequence of block links, the bitcoin system requires each effective block to include the answer to a special mathematical problem, and the computer calculates the text of the whole block, In addition, random guessing based on encrypted hash can be done until an output lower than a certain value is obtained. Hash function can create a short summary from any length of text. This fixed output value is very complex. The only way to find it is random guessing, which is called mining -
when King released PPC last year, it introced checkpoint mechanism to protect against attacks in its early development. This mechanism enables it to resist 51% attacks. " Developers can control a parent node and broadcast "checkpoints" to the whole network, which allows other nodes to agree on certain blocks“ This is actually a [blockchain] continuity warning message, "he said< br />