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Input：`headerinfo', 76 Bytes

Ouput：sha256(sha256(headerinfo + Nonce))

Nonce is incremented from 0x00000000 to 0xFFFFFFFF

Example

Try1: 0200000017975b97c18ed1f7e255adf297599b55330edab87803c81701000000000000008a97295a2747b4f1a0b3948df3990344c0e19fa6b2b92b3a19c8e6badc141787358b0553535f0119 + 00000000

Try2: 0200000017975b97c18ed1f7e255adf297599b55330edab87803c81701000000000000008a97295a2747b4f1a0b3948df3990344c0e19fa6b2b92b3a19c8e6badc141787358b0553535f0119 + 00000001

Try3: 0200000017975b97c18ed1f7e255adf297599b55330edab87803c81701000000000000008a97295a2747b4f1a0b3948df3990344c0e19fa6b2b92b3a19c8e6badc141787358b0553535f0119 + 00000002

When the Nonce is exhausted, request for a new `headerinfo'.

Test Data

headerinfo: 0200000017975b97c18ed1f7e255adf297599b55330edab87803c81701000000000000008a97295a2747b4f1a0b3948df3990344c0e19fa6b2b92b3a19c8e6badc141787358b0553535f0119

target_str: 00000000000000015f5300000000000000000000000000000000000000000000

solution (Nonce): 48750833