O texto presente na descrição do desafio deve ser passado em 4 funções decoder diferentes até chegar ao formato de chave privada hexadecimal (64 dígitos). TEXTO -> DecodeBase32 -> DecodeBase58 -> DecodeBase64 -> BinaryToHex -> CHAVE 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 -> 8MvbGBA5bfur3YZQHt1ABdV6KEnjaeuC2BsuuxgejkpusUgypziBCcBaYvtpXqiT3hdKy31G6y87FMhq7qWxVFBUfWZghrJY7n52BC42g4NyrYEA6Dh46Wfz6TZnjGvvLUi1KTCuZFSVuKuLpwCVYhvkCrrkRSp25wrMNZ4d3H8cAwM9BheSgfz3W8vJazvLrVtZaG1xceVqzCVbWiT38cXXwkRX4BctAtkQmzAx1erMVKuUQZJP9BbBVCfiP1whEUBcoMTeAGY2mvGUqDBw3RFkkEiFprUJzuvhh1SrF9Swo3pvmhXBBCPnCGrp2Z9cQjUKcrGWcb8VmbZCxwy87buMNcTvFxQf9xReB9u6fZmqqF6ig7R4KGh9J86ZdK91PWHhpnJqheQGMfpd7R3AWyckx5DmFLPAezae4u7zogvkDrm8pCQrUMYpFNn4YFJMREGmX8C4N5sYbMohvTcZVn -> MTEwMTAwMDEwMDEwMDExMTEwMTExMDEwMDEwMTAwMDAwMTAxMDEwMTExMDAxMDAwMDEwMDAwMTAxMTEwMDEwMDExMTExMDEwMTEwMDAxMDAxMDEwMDExMTExMDEwMDExMDAxMDEwMTEwMTExMDExMDExMTAxMDEwMTEwMTAwMTAxMTAxMTEwMTAwMDAwMTEwMTEwMTEwMDEwMTEwMTAwMTExMTEwMDAxMTExMDAxMTExMDAwMTAwMDAxMTEwMTExMDAxMDAwMTEwMTAwMDExMTAxMTAwMTAxMTEwMDEwMTExMDAwMDAwMTEwMDExMDAxMTAwMTExMDAwMTEwMTAxMA== -> 1101000100100111101110100101000001010101110010000100001011100100111110101100010010100111110100110010101101110110111010101101001011011101000001101101100101101001111100011110011110001000011101110010001101000111011001011100101110000001100110011001110001101010 -> 0xd127ba5055c842e4fac4a7d32b76ead2dd06d969f1e78877234765cb81999c6a Por fim é só remover o prefixo "0x" da chave.