10 days of bitcoin 0 confirmation
Publish: 2021-04-15 05:29:06
1. It seems to take half an hour to an hour. Generally, one confirmation is enough, but some platforms need three to five confirmations.
2. If you want to ensure the irreversibility of the transaction, you have to wait for six data blocks to be fully confirmed, which takes at least one hour to confirm.
3. Generally, only the payee can return bitcoin after 24 hours. Any bitcoin transaction is irreversible and can only be returned by the payee.
4. Radar coin will, bitcoin did not encounter this situation!
5. 1，4 matlab是有帮助文档的，我没有明白你所指的去中心化处理是什么，PCA的结果在数组自己的维度
以下是帮助文档，请仔细阅读
coeff = pca(X) returns the principal component coefficients, also known as loadings, for the n-by-p data matrix X. Rows of X correspond to observations and columns correspond to variables. The coefficient matrix is p-by-p. Each column of coeffcontains coefficients for one principal component, and the columns are in descending order of component variance. By default, pca centers the data and uses the singular value decomposition (SVD) algorithm.
example
coeff = pca(X,Name,Value) returns any of the output arguments in the previous syntaxes using additional options for computation and handling of special data types, specified by one or more Name,Value pair arguments.
For example, you can specify the number of principal components pca returns or an algorithm other than SVD to use.
example
[coeff,score,latent] = pca(___) also returns the principal component scores in score and the principal component variances in latent. You can use any of the input arguments in the previous syntaxes.
Principal component scores are the representations of X in the principal component space. Rows of score correspond to observations, and columns correspond to components.
The principal component variances are the eigenvalues of the covariance matrix of X.
example
[coeff,score,latent,tsquared] = pca(___) also returns the Hotelling's T-squared statistic for each observation in X.
example
[coeff,score,latent,tsquared,explained,mu] = pca(___) also returns explained, the percentage of the total variance explained by each principal component and mu, the estimated mean of each variable in X.
2. PCA 和SVD的不同是，他们分解矩阵的方式是不同的我建议你翻看wikipedia里面SVD和PCA的说明，里面公式很清晰了
以下是帮助文档，请仔细阅读
coeff = pca(X) returns the principal component coefficients, also known as loadings, for the n-by-p data matrix X. Rows of X correspond to observations and columns correspond to variables. The coefficient matrix is p-by-p. Each column of coeffcontains coefficients for one principal component, and the columns are in descending order of component variance. By default, pca centers the data and uses the singular value decomposition (SVD) algorithm.
example
coeff = pca(X,Name,Value) returns any of the output arguments in the previous syntaxes using additional options for computation and handling of special data types, specified by one or more Name,Value pair arguments.
For example, you can specify the number of principal components pca returns or an algorithm other than SVD to use.
example
[coeff,score,latent] = pca(___) also returns the principal component scores in score and the principal component variances in latent. You can use any of the input arguments in the previous syntaxes.
Principal component scores are the representations of X in the principal component space. Rows of score correspond to observations, and columns correspond to components.
The principal component variances are the eigenvalues of the covariance matrix of X.
example
[coeff,score,latent,tsquared] = pca(___) also returns the Hotelling's T-squared statistic for each observation in X.
example
[coeff,score,latent,tsquared,explained,mu] = pca(___) also returns explained, the percentage of the total variance explained by each principal component and mu, the estimated mean of each variable in X.
2. PCA 和SVD的不同是，他们分解矩阵的方式是不同的我建议你翻看wikipedia里面SVD和PCA的说明，里面公式很清晰了
6. Illegal
at present, there is no recognition that any virtual currency is legal in China, including bitcoin, which was very noisy a few years ago. In the end, the central bank directly declared it illegal.
at present, there is no recognition that any virtual currency is legal in China, including bitcoin, which was very noisy a few years ago. In the end, the central bank directly declared it illegal.
7. Zhao CHANGPENG, the founder of coin an, soon became the largest virtual currency transaction in the world. At the beginning of this year, there were 10 billion US dollars of transaction volume every day. This is really powerful!
8.
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
9. This is very difficult to find. Failure to confirm is proof of the failure of this transaction and failure to obtain confirmation from the network. Bitcoin receives payments almost instantaneously. However, there is an average delay of 10 minutes before the network starts adding your transaction to a block to confirm the transaction and that you can use the received bitcoin. Confirmation means that there is a consensus on the Internet that the bitcoin you receive is not used to pay others, so it is recognized as your property. Once your transaction is included in one block, all subsequent blocks will include it, which will greatly consolidate this consensus and rece the risk of transaction cancellation. Each user can determine the time when the transaction is confirmed, but generally speaking, receiving six confirmations is as safe as waiting six months after a credit card transaction
however, foreign studies have also shown that these bitcoins can be tracked and retrieved, but they are troublesome. At present, they are still in theory, and no company provides such services. Bitcoin house has this convenient report. You can check it on it.
however, foreign studies have also shown that these bitcoins can be tracked and retrieved, but they are troublesome. At present, they are still in theory, and no company provides such services. Bitcoin house has this convenient report. You can check it on it.
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