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Update bsv-20 mint contract.
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@msinkec
msinkec committed Oct 3, 2023
1 parent 796b05f commit 84ac264
Showing 1 changed file with 51 additions and 81 deletions.
132 changes: 51 additions & 81 deletions src/contracts/bsv20Mint.ts
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
import { assert } from 'console'
import {
ByteString,
FixedArray,
OpCode,
Addr,
SmartContract,
Expand All @@ -10,24 +9,19 @@ import {
hash256,
int2ByteString,
len,
lshift,
method,
prop,
slice,
toByteString,
} from 'scrypt-ts'
import { Shift10 } from 'scrypt-ts-lib'

export class BSV20Mint extends SmartContract {
@prop()
totalSupply: bigint
@prop(true)
supply: bigint

@prop()
maxMintAmount: bigint

@prop(true)
alreadyMinted: bigint

@prop(true)
isFirstMint: boolean

Expand All @@ -43,38 +37,23 @@ export class BSV20Mint extends SmartContract {
@prop(true)
prevInscriptionLen: bigint

// Hex representation of bytes 0-255
@prop()
static readonly hexAsciiTable: FixedArray<ByteString, 16> = [
toByteString('0', true),
toByteString('1', true),
toByteString('2', true),
toByteString('3', true),
toByteString('4', true),
toByteString('5', true),
toByteString('6', true),
toByteString('7', true),
toByteString('8', true),
toByteString('9', true),
toByteString('a', true),
toByteString('b', true),
toByteString('c', true),
toByteString('d', true),
toByteString('e', true),
toByteString('f', true),
]
static readonly hexAsciiTable: ByteString = toByteString(
'000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff',
true
)

constructor(
totalSupply: bigint,
supply: bigint,
maxMintAmount: bigint,
lastUpdate: bigint,
timeDelta: bigint,
prevInscriptionLen: bigint
) {
super(...arguments)
this.totalSupply = totalSupply
this.supply = supply
this.maxMintAmount = maxMintAmount
this.alreadyMinted = 0n
this.isFirstMint = false
this.tokenId = toByteString('')
this.lastUpdate = lastUpdate
this.timeDelta = timeDelta
Expand All @@ -96,32 +75,23 @@ export class BSV20Mint extends SmartContract {
assert(amount <= this.maxMintAmount, 'mint amount exceeds maximum')

// If first mint, parse token id and store it in a state var
if (this.isFirstMint) {
if (this.tokenId == toByteString('')) {
this.tokenId =
BSV20Mint.txId2Ascii(this.ctx.utxo.outpoint.txid) +
BSV20Mint.txidToAscii(this.ctx.utxo.outpoint.txid) +
toByteString('_', true) +
BSV20Mint.int2Ascii(this.ctx.utxo.outpoint.outputIndex)
this.isFirstMint = false
BSV20Mint.intToAscii(this.ctx.utxo.outpoint.outputIndex)
}

// Check if tokens still available.
assert(
this.totalSupply - this.alreadyMinted >= amount,
'not enough tokens left to mint'
)

// Update already minted amount.
this.alreadyMinted += amount
// Update supply.
this.supply -= amount

// If there are still tokens left, then
// build state output inscribed with leftover tokens.
let outputs = toByteString('')

if (this.alreadyMinted != this.totalSupply) {
// If there are still tokens left, then
// build state output inscribed with leftover tokens.
const leftover = this.totalSupply - this.alreadyMinted
const transferInscription = BSV20Mint.getTransferInsciption(
if (this.supply > 0n) {
const transferInscription = BSV20Mint.buildTransferInsciption(
this.tokenId,
leftover
this.supply
)
const stateScript = slice(
this.getStateScript(),
Expand All @@ -134,10 +104,10 @@ export class BSV20Mint extends SmartContract {
}

// Build P2PKH output to dest paying specified amount of tokens.
const script1 =
BSV20Mint.getTransferInsciption(this.tokenId, amount) +
const destScript =
BSV20Mint.buildTransferInsciption(this.tokenId, amount) +
Utils.buildPublicKeyHashScript(dest)
outputs += Utils.buildOutput(script1, 1n)
outputs += Utils.buildOutput(destScript, 1n)

// Build change output.
outputs += this.buildChangeOutput()
Expand All @@ -154,19 +124,24 @@ export class BSV20Mint extends SmartContract {
// "amt": "10000"
//}
@method()
static getTransferInsciption(tokenId: ByteString, amt: bigint): ByteString {
const transferJson =
static buildTransferInsciption(
tokenId: ByteString,
amt: bigint
): ByteString {
const json: ByteString =
toByteString('{"p":"bsv-20","op":"transfer","id":"', true) +
tokenId +
toByteString('","amt":"', true) +
BSV20Mint.int2Ascii(amt) +
BSV20Mint.intToAscii(amt) +
toByteString('"}', true)

return (
// OP_FALSE OP_IF OP_DATA3 "ord" OP_1 OP_DATA18 "application/bsv-20" OP_0
toByteString(
'0063036f726451126170706c69636174696f6e2f6273762d323000'
) +
int2ByteString(len(transferJson)) +
transferJson +
OpCode.OP_PUSHDATA1 +
int2ByteString(len(json)) +
json +
OpCode.OP_ENDIF
)
}
Expand All @@ -175,40 +150,35 @@ export class BSV20Mint extends SmartContract {
// 1000 -> '31303030'
// Input cannot be larger than 2^64-1.
@method()
static int2Ascii(n: bigint): ByteString {
// Max 2^64-1
assert(n < lshift(1n, 64n), 'n is larger than 2^64-1')

let res = toByteString('')
static intToAscii(num: bigint): ByteString {
assert(
num >= 0n && num < 18446744073709551616n,
'value must be uint64 ' + num
)
let ascii = toByteString('', true)
let done = false

for (let i = 0; i < 20; i++) {
if (!done) {
// Get ith digit: n // 10^i % 10
const denominator = Shift10.pow(BigInt(i))

if (n < denominator) {
done = true
const char = (num % 10n) + 48n
ascii = int2ByteString(char) + ascii
if (num > 9n) {
num = num / 10n
} else {
const ithDigit = (n / denominator) % 10n

// Transform digit to ASCII (hex encoded) and prepend to result.
res = int2ByteString(48n + ithDigit, 1n) + res
done = true
}
}
}

return res
return ascii
}

@method()
static txId2Ascii(txId: ByteString): ByteString {
static txidToAscii(txId: ByteString): ByteString {
let res = toByteString('')

for (let i = 0; i < 32; i++) {
const char = slice(txId, BigInt(i), BigInt(i + 1))
const charInt = byteString2Int(char)
res += BSV20Mint.hexAsciiTable[Number(charInt)]
for (let i = 0n; i < 32n; i++) {
const bytePos = 31n - i
const byte = slice(txId, bytePos, bytePos + 1n)
const hexPos = byteString2Int(byte + toByteString('00')) * 2n
res += slice(BSV20Mint.hexAsciiTable, hexPos, hexPos + 2n)
}
return res
}
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