What is the difference between the SHA256d and SHA256 hashing algorithm?

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I have seen some coins using SHA256d algorithm latley, what is the big difference between SHA256d and the SHA256 that bitcoin uses?

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SHA-256d is also known as Double SHA-256 hash algorithm. It is a cryptographic hash, first proposed by Ferguson and Schneier in the book “Practical Cryptography”. Bitcoin is one such cryptocurrency that utilizes the SHA-256d hashing algorithm. The SHA-256d hash is achieved by applying the regular SHA-256 hash twice, by first applying SHA-256 hash to the data and then once again to the resulting hash.

Many of the early released cryptocurrencies uses the SHA-256d algorithm such as: Bitcoin, Freicoin, Namecoin and Peercoin.

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