opreturncode / slp-light

early access

slp-light

slp-light is a lightweight library for creating a slp-token transaction. It has few exposed methods to make sure it is as easy as possible to create a token transaction, hiding all complexity from the user.

Installation

npm install slp-light

Examples

Fetching utxos

To fetch utxos use the method retrieveUtxos() which lets the user select the source of the utxos. Here is an example using public available apis from Bitcoin.com.

Using BitcoinComRetrieverImpl

import { Utxo } from './src/Utxo'; 
import { retrieveBchUtxos, retrieveSlpUtxos } from './src/index'; 
import { BitcoinComBchRetriever, BitcoinComSlpRetriever } from './src/facade/bitcoincom/';

let bch: Utxo[] = await retrieveBchUtxos({cashAddress: "bitcoincash:qzm4u38umtw6ak4was24r6ucerkzzxqr5s2328xm0r", wif: "WIF"}, new BitcoinComBchRetriever());
let slp: Utxo[] = await retrieveSlpUtxos({cashAddress: "bitcoincash:qzm4u38umtw6ak4was24r6ucerkzzxqr5s2328xm0r", wif: "WIF"}, new BitcoinComSlpRetriever());

Using custom UtxoRetrieverFacade. When using a custom retriever make sure the source only allows valid slp-transactions. Since the library does not have its own validation it relies on the utxo source for validation.

import { retrieveBchUtxos, retrieveSlpUtxos } from './src/index'; 
import {Address, Utxo } from './src/Utxo'; 
import { BchUtxoRetrieverFacade } from './src/facade/UtxoRetrieverFacade'; 

const retriever: BchUtxoRetrieverFacade = {
        getBchUtxosFromAddress(address: Address): Promise<Utxo[]> {
            // Custom utxo retriever code goes here
            return Promise.resolve([]);
        }
}
const utxos: Utxo[] = await retrieveBchUtxos({cashAddress: "bitcoincash:qzm4u38umtw6ak4was24r6ucerkzzxqr5s2328xm0r", wif: "WIF"}, retriever);

Selecting utxos

import { selectUtxos } from './src/index'; 
import { SelectedUtxos } from './src/index'; 
import BigNumber from 'bignumber.js'; 
import {Utxo } from './src/Utxo'; 

const utxos: Utxo[] = [];
const selectUtxo: SelectedUtxos = selectUtxos(new BigNumber("5"), "323437d4c86b00874c3b00cd454ab6ffb3226130fde09747009cf270caedddcf", utxos);

Creating transaction

import { createRawTx } from './src/index'; 
import BigNumber from 'bignumber.js'; 
import { SelectedUtxos } from './src/utxo'; 

const mySelectedUtxos: SelectedUtxos = null;
const rawTx = createRawTx(new BigNumber("5"), "dcf128f7f836f369d339963685e91b105cf7982d8977d09f6a776329a6e290e7",
        "bitcoincash:qrve2j5h2f8hy9hlptu7ejltzf4m7fwees60qss5f4",
        "bitcoincash:qzm4u38umtw6ak4was24r6ucerkzzxqr5s2328xm0r",
        mySelectedUtxos);

Broadcast Transaction

You can either use one of the premade broadcasting facades implementing the interface or implement your own as shown below.

import { broadcastTransaction } from './src/index'; 
import { BroadcastFacade } from './src/facade/BroadcastFacade';
 
const broadcastFacade: BroadcastFacade = {
        broadcastTransaction(raw: string): Promise<string> {
            return Promise.resolve('BROADCAST REQUEST GOES HERE');
        }
}
const rawTx = broadcastTransaction("TX_RAW", broadcastFacade);

Using simpleSend

If you just want to broadcast a transaction using Bitcoin.com apis then you can use the simpleSend() function from simple.ts. This method is an abstraction on top of the other methods for simplicity. If you want more control use the other methods in combination with each other.

import { simpleSend } from './src/simple'; 
import BigNumber from 'bignumber.js'; 

const txId = await simpleSend("Kzm1oz8sLSvuQLEgu99xixSkhNj7kyBZe6TpqTfdgKGhXUeSLSR",
            "simpleledger:qp2mdqc4r8ylsrnu9f4j5xu8r47m722f6uyfsz4zr6",
            "323437d4c86b00874c3b00cd454ab6ffb3226130fde09747009cf270caedddcf",
            new BigNumber(300));

Build & Test

Build

npm run build

Test

npm run test:npx

Authors

• Andreas Larsson - AndreasLarssons
• Jt Freeman - blockparty-sh