;; Base58 decoding function for Clarity
;; Takes a base58 string and returns its hex representation
(define-constant BASE58_ALPHABET "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz")
(define-private (char-to-u8 (c (string-ascii 1)))
(unwrap-panic
(index-of BASE58_ALPHABET c)))
(define-read-only (b58-decode (input (string-ascii 34)))
(let
(
;; Extract characters from the input string
(c1 (unwrap-panic (element-at input u0)))
(c2 (unwrap-panic (element-at input u1)))
(c3 (unwrap-panic (element-at input u2)))
(c4 (unwrap-panic (element-at input u3)))
(c5 (unwrap-panic (element-at input u4)))
(c6 (unwrap-panic (element-at input u5)))
(c7 (unwrap-panic (element-at input u6)))
(c8 (unwrap-panic (element-at input u7)))
(c9 (unwrap-panic (element-at input u8)))
(c10 (unwrap-panic (element-at input u9)))
(c11 (unwrap-panic (element-at input u10)))
(c12 (unwrap-panic (element-at input u11)))
(c13 (unwrap-panic (element-at input u12)))
(c14 (unwrap-panic (element-at input u13)))
(c15 (unwrap-panic (element-at input u14)))
(c16 (unwrap-panic (element-at input u15)))
(c17 (unwrap-panic (element-at input u16)))
(c18 (unwrap-panic (element-at input u17)))
(c19 (unwrap-panic (element-at input u18)))
(c20 (unwrap-panic (element-at input u19)))
(c21 (unwrap-panic (element-at input u20)))
(c22 (unwrap-panic (element-at input u21)))
(c23 (unwrap-panic (element-at input u22)))
(c24 (unwrap-panic (element-at input u23)))
(c25 (unwrap-panic (element-at input u24)))
(c26 (unwrap-panic (element-at input u25)))
(c27 (unwrap-panic (element-at input u26)))
(c28 (unwrap-panic (element-at input u27)))
(c29 (unwrap-panic (element-at input u28)))
(c30 (unwrap-panic (element-at input u29)))
(c31 (unwrap-panic (element-at input u30)))
(c32 (unwrap-panic (element-at input u31)))
(c33 (unwrap-panic (element-at input u32)))
(c34 (unwrap-panic (element-at input u33)))
;; Convert each character to its numeric value in the Base58 alphabet
(v1 (char-to-u8 c1))
(v2 (char-to-u8 c2))
(v3 (char-to-u8 c3))
(v4 (char-to-u8 c4))
(v5 (char-to-u8 c5))
(v6 (char-to-u8 c6))
(v7 (char-to-u8 c7))
(v8 (char-to-u8 c8))
(v9 (char-to-u8 c9))
(v10 (char-to-u8 c10))
(v11 (char-to-u8 c11))
(v12 (char-to-u8 c12))
(v13 (char-to-u8 c13))
(v14 (char-to-u8 c14))
(v15 (char-to-u8 c15))
(v16 (char-to-u8 c16))
(v17 (char-to-u8 c17))
(v18 (char-to-u8 c18))
(v19 (char-to-u8 c19))
(v20 (char-to-u8 c20))
(v21 (char-to-u8 c21))
(v22 (char-to-u8 c22))
(v23 (char-to-u8 c23))
(v24 (char-to-u8 c24))
(v25 (char-to-u8 c25))
(v26 (char-to-u8 c26))
(v27 (char-to-u8 c27))
(v28 (char-to-u8 c28))
(v29 (char-to-u8 c29))
(v30 (char-to-u8 c30))
(v31 (char-to-u8 c31))
(v32 (char-to-u8 c32))
(v33 (char-to-u8 c33))
(v34 (char-to-u8 c34))
;; Compute the decimal value using the base58 positional system
;; For each digit, multiply by 58^position and sum
(decimal-value (+
(* v1 (pow u58 u33))
(* v2 (pow u58 u32))
(* v3 (pow u58 u31))
(* v4 (pow u58 u30))
(* v5 (pow u58 u29))
(* v6 (pow u58 u28))
(* v7 (pow u58 u27))
(* v8 (pow u58 u26))
(* v9 (pow u58 u25))
(* v10 (pow u58 u24))
(* v11 (pow u58 u23))
(* v12 (pow u58 u22))
(* v13 (pow u58 u21))
(* v14 (pow u58 u20))
(* v15 (pow u58 u19))
(* v16 (pow u58 u18))
(* v17 (pow u58 u17))
(* v18 (pow u58 u16))
(* v19 (pow u58 u15))
(* v20 (pow u58 u14))
(* v21 (pow u58 u13))
(* v22 (pow u58 u12))
(* v23 (pow u58 u11))
(* v24 (pow u58 u10))
(* v25 (pow u58 u9))
(* v26 (pow u58 u8))
(* v27 (pow u58 u7))
(* v28 (pow u58 u6))
(* v29 (pow u58 u5))
(* v30 (pow u58 u4))
(* v31 (pow u58 u3))
(* v32 (pow u58 u2))
(* v33 (pow u58 u1))
(* v34 (pow u58 u0)))))
;; Convert to hex representation
decimal-value
)
)
;; Example usage:
;; (b58-decode "1JSjpoj1m57KQqd9SvYgFzbRVUwrmk4Emd")
;; This should return the hex representation of the bitcoin address