AppendChecksum creates a checksum for the given payload and appends it, according to `https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/cashaddr.md#checksum`.

EncodePrefix encodes prefix according to `https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/cashaddr.md#checksum`.

PayToAddrScript creates a new script to pay a transaction output to a the specified address.

PolyMod implements `PolyMod` function uint64_t PolyMod(const data &v) { uint64_t c = 1; for (uint8_t d : v) { uint8_t c0 = c >> 35; c = ((c & 0x07ffffffff) << 5) ^ d; if (c0 & 0x01) c ^= 0x98f2bc8e61; if (c0 & 0x02) c ^= 0x79b76d99e2; if (c0 & 0x04) c ^= 0xf33e5fb3c4; if (c0 & 0x08) c ^= 0xae2eabe2a8; if (c0 & 0x10) c ^= 0x1e4f43e470; } return c ^ 1; } defined in `https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/cashaddr.md`, it is used to calculate the checksum for bitcoin cash addresses.

VerifyChecksum verifies whether the given payload is wellformed, according to `https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/cashaddr.md#checksum`.

BCashCodec is the BitcoinCash address encoding format according to `https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/cashaddr.md#payload`.