手续费计算.md

手续费计算

根据 https://bitcoinops.org/en/tools/calc-size/

Transaction size = 10.5 + 57.5 * inputsNumber + 43 * outputsNumber

再根据 ordinals 脚本：

fn append_reveal_script_to_builder(&self, mut builder: script::Builder) -> script::Builder {
    builder = builder
        .push_opcode(opcodes::OP_FALSE)
        .push_opcode(opcodes::all::OP_IF)
        .push_slice(PROTOCOL_ID);

    if let Some(content_type) = &self.content_type {
        builder = builder
        .push_slice(CONTENT_TYPE_TAG)
        .push_slice(content_type);
    }

    if let Some(body) = &self.body {
        builder = builder.push_slice(BODY_TAG);
        for chunk in body.chunks(520) {
            builder = builder.push_slice(chunk);
        }
    }

    builder.push_opcode(opcodes::all::OP_ENDIF)
}

OP_FALSE
OP_IF
  OP_PUSH "ord"
  OP_PUSH 1
  OP_PUSH "text/plain;charset=utf-8"
  OP_PUSH 0
  OP_PUSH "Hello, world!"
OP_ENDIF

• OP_FALSE : 1
• OP_IF : 1
  • OP_PUSH ord : 1 + 3
  • OP_PUSH 1 : 1 + 1
  • OP_PUSH "image/png": 1 + 9
  • OP_PUSH 0: 2
  • OP_PUSH 图片内容(520字节一个块): 3 * (imageSize / 520) + imageSize
• OP_ENDIF: 1

def calcsize(count, contentType, imageSize):
    commitTxSize = 10.5 +  57.5 * 1 + 43 * (count + 1)
    revealTxSize = 10.5 +  57.5 * 1 + 43 * (count)
    ordinalsSize = 1 + 1 + (1+3) + 2 + 1 + len(contentType) + 2 + (3 * (imageSize / 520) + imageSize) + 1
    return  commitTxSize + revealTxSize + ordinalsSize