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micro-sol-signer

Create, sign & decode Solana transactions with minimum deps.

🔓 Secure: minimum deps, audited noble cryptography
🔻 Tree-shaking-friendly: use only what's necessary, other code won't be included
✍️ Create, sign and decode transactions
🪶 800 lines of code

Check out all web3 utility libraries: ETH, BTC, SOL, tx-tor-broadcaster

Usage

npm install micro-sol-signer

import * as sol from 'micro-sol-signer';

Method summary:

function formatPrivate(privateKey: Bytes, format: 'base58' | 'hex' | 'array' = 'base');
function getPublicKey(privateKey: Bytes);
function getAddress(privateKey: Bytes);
function getAddressFromPublicKey(publicKey: Bytes);
function signTx(privateKey: Bytes, data: TxData): Promise<[string, string]>;
function verifyTx(tx: TxData);
function createTx(from: string, to: string, amount: string, _fee: bigint, blockhash: string);
function createTxComplex(address: string, instructions: Instruction[], blockhash: string);
function defineProgram<T extends Record<string, MethodHint<any>>>;
function isOnCurve(bytes: Bytes | string);
function parseInstruction(instr: Instruction, tl: TokenList): any;
function programAddress(program: string, ...seeds: Bytes[]);
function tokenAddress(mint: string, owner: string, allowOffCurveOwner = false);
function tokenFromSymbol(symbol: string, tokens = COMMON_TOKENS);
function validateAddress(address: string);

There are other variables such as SYS_PROGRAM, which are also exported. Specific features:

Create and sign simple transaction
Decode transaction
Create complex transactions and send tokens
Network
ABI / API

Create and sign simple transaction

// 11111111... private key
const privKey = new Uint8Array(32).fill(0x01);
// Get address of private key
const address = sol.getAddress(privKey);
// AKnL4NNf3DGWZJS6cPknBuEGnVsV4A4m5tgebLHaRSZ9

// Format private key
const privFormatted = sol.formatPrivate(privKey);
// 2AXDGYSE4f2sz7tvMMzyHvUfcoJmxudvdhBcmiUSo6iuCXagjUCKEQF21awZnUGxmwD4m9vGXuC3qieHXJQHAcT

// Simple tx (transfer some sol's from one account to another)
const toAddress = 'FDwkzWGxx6LfCfzcmVVLEk3QUMxNhuFuKEMRwzR4Dtys';
const blockhash = 'J2BjKU6L83eehHVgoze6uTXGCBu6nbxsqEro9QvWpU52';
const amount = '10.1';
const fee = '1.2';
const tx0 = sol.createTx(address, toAddress, amount, fee, blockhash);
// AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAEDiojj3XQJ8ZX9UtstPLpdcspnCb8dlBIb83SIAbQPb1zTVICVf7+to6zQ/+XautpF+KSSoZ7ESTxv3rg8xPqyXgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA/ORj/WtXHGLCh9wC0eGkf26qTFR5x3nCqwXXmoVtZb0BAgIAAQwCAAAAAMUBWgIAAAA=
const [txHash0, signedTx0] = sol.signTx(privKey, tx0);
/*
{
  txHash0: '3wL4PdgBr3J2r4uuUrf4MU7HhgrJg6re2YRBeAwsZpYZRHgSgUAJymLRu6GcnKk7ZuR3F5UgPRTNj1mbzv966PTy',
  signedTx0: 'AZLiibj05SPRhNU/o3ntK/7+aNQ8H/3HGLdh6zjxZKdyrKJEhjUjWDlMnEF2x0U/8JsKYsMMiYvQShkuNfpYdAwBAAEDiojj3XQJ8ZX9UtstPLpdcspnCb8dlBIb83SIAbQPb1zTVICVf7+to6zQ/+XautpF+KSSoZ7ESTxv3rg8xPqyXgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA/ORj/WtXHGLCh9wC0eGkf26qTFR5x3nCqwXXmoVtZb0BAgIAAQwCAAAAAMUBWgIAAAA='
}
  */

Decode transaction

const { base64 } = require('@scure/base');
const sol = require('../lib');

// Random USDT tx from explorer:
// https://explorer.solana.com/tx/5Nnhjv1GVB8T1k8MguUGHQw5zQQQsWET1f1zzj8azRhnVoYQPoZPtkscPCKy6FisP2eVWehjU1EYV8zywqKm5if4
const tx =
  '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';
const decodedTx = sol.Transaction.decode(base64.decode(tx));

console.log(decodedTx);
/*
{
  msg: {
    feePayer: 'EqywLUZcm73PSWri93X3M5TN62iFMsUPMjvWYUq89dKB',
    blockhash: '9xp5Jz2v7ZsE3Xn5SVGkRisjo7h16vzF1ducwhWnc5n9',
    instructions: [ [Object], [Object] ]
  },
  signatures: {
    EqywLUZcm73PSWri93X3M5TN62iFMsUPMjvWYUq89dKB: Uint8Array(64),
    '38QU8LKVK1Ew5uzsqttamNTTFxvnfzgi2ACQvj3ekuom': Uint8Array(64),
  }
}
*/

console.log(
  decodedTx.msg.instructions.map((i) => {
    return sol.parseInstruction(i, {
      ...sol.COMMON_TOKENS,
      // You can add custom tokens here if needed
    });
  })
);
/*
[
  {
    type: 'advanceNonce',
    info: {
      nonceAccount: 'dN98UQCp6Hq9kedJKEczHt5B53tsC8eENv9cGEVwvuD',
      nonceAuthority: '38QU8LKVK1Ew5uzsqttamNTTFxvnfzgi2ACQvj3ekuom'
    },
    hint: 'Consume nonce in nonce account=dN98UQCp6Hq9kedJKEczHt5B53tsC8eENv9cGEVwvuD (owner: 38QU8LKVK1Ew5uzsqttamNTTFxvnfzgi2ACQvj3ekuom)'
  },
  {
    type: 'transferChecked',
    info: {
      amount: 64487850900n,
      decimals: 6,
      source: '3VDHywae15vgbG2euNPpwoHTEr2eyGLuS6EoF74kDkp4',
      mint: 'Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB',
      destination: '3feqC1fmo5YHMh2iw7X9kGE9F8P147hiiDQqC5xtSbpN',
      owner: 'EqywLUZcm73PSWri93X3M5TN62iFMsUPMjvWYUq89dKB'
    },
    hint: 'Transfer 64487.8509 USDT from token account=3VDHywae15vgbG2euNPpwoHTEr2eyGLuS6EoF74kDkp4 of owner=EqywLUZcm73PSWri93X3M5TN62iFMsUPMjvWYUq89dKB to 3feqC1fmo5YHMh2iw7X9kGE9F8P147hiiDQqC5xtSbpN'
  }
]
*/

Create complex transactions and send tokens

Solana is very flexible and has awesome architecture, but it also means there is no 'right' way to send tokens:

Basic account (ex. EqywLUZcm73PSWri93X3M5TN62iFMsUPMjvWYUq89dKB) cannot have any tokens
For every token contract you need to create separate token account which will be controlled by token contract
If a user gives some address to send tokens, it can be:
- Solana account: which means we need to derive token account address (sol.tokenAddress)
- Token account: it is possible the token account has not yet been created, in this case we can create it for user; but it is not free, and will cost some fee.
- token account which was derived in a different way from main solana account

The basic token sending example is:

// Current blockhash
const blockhash = '9xp5Jz2v7ZsE3Xn5SVGkRisjo7h16vzF1ducwhWnc5n9';
// Sol account which is owner of tokenAccount
const fromAccount = 'EqywLUZcm73PSWri93X3M5TN62iFMsUPMjvWYUq89dKB';

const USDT = sol.tokenFromSymbol('USDT', {
  ...sol.COMMON_TOKENS,
  // You can add custom tokens here
});
// Deriving token account address from solana account address
const fromTokenAccount = sol.tokenAddress(USDT.contract, fromAccount);

// Should be valid token account, not solana account
const toTokenAddress = 'FDwkzWGxx6LfCfzcmVVLEk3QUMxNhuFuKEMRwzR4Dtys';

const amount = '64487.8509';
const tokenSimple = sol.createTxComplex(
  fromAccount, // owner of source token account (solana account)
  [
    sol.token.transferChecked({
      source: fromTokenAccount, // Source token account (not solana account)
      amount: sol.parseDecimal(amount, USDT.decimals),
      decimals: USDT.decimals, // decimals of value
      mint: USDT.contract, // token contract address
      owner: fromAccount, // owner of source token account (solana account)
      destination: toTokenAddress,
    }),
  ],
  blockhash
);
console.log(tokenSimple);
/*
  AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAIFzbQwA0gwj3aPV5V86IflZDr3UfOcT1l5B+N5ekM2bR4k8Yk3xWjUHgJESQnn3AeSSRnm/0Ma4+Hacb/Cr/YApdNUgJV/v62jrND/5dq62kX4pJKhnsRJPG/euDzE+rJezgEOYK/tsicXvWMZL1QUWj+WWjO7gtLHAp6yzh4ggmQG3fbh12Whk9nL4UbO63msHLSF7V9bN5E6jPWFfv8AqYUpqsC9KfFD7lsris1C7YZkNRdSH5qix9nMo2igoP0yAQQEAQMCAAoMlIPGAw8AAAAG
  */

However, in real world you may need more complex logic, like:

// Check if account is valid token account
function isValidTokenAccount(mint, info, owner) {
  if (!info) return false;
  if (info.owner !== sol.TOKEN_PROGRAM) return false;
  try {
    const data = sol.TokenAccount.decode(info.data);
    if (data.mint !== mint) return false;
    if (data.state !== 'initialized') return false;
    if (owner && data.owner !== owner) return false;
    return true;
  } catch (e) {
    return false;
  }
}

async function solAccountInfo(address) {
  // Network code, outside of scope of this package

  // Call rpc with getAccountInfo
  const res = await rpcCall('getAccountInfo', address, {
    encoding: 'base64',
    commitment: 'confirmed',
  });
  if (res.value === null) return undefined;
  const [data, encoding] = res.value.data;
  if (encoding !== 'base64') throw new Error(`SOL: invalid data encoding=${encoding}`);
  return {
    lamports: BigInt(res.value.lamports),
    owner: res.value.owner,
    rentEpoch: res.value.rentEpoch,
    data: base64.decode(data),
    exec: !!res.value.executable,
  };
}

async function createTx(
  fromAddress, // our address (solana account), from which we will send tokens
  toAddress, // user provided address to send tokens in.
  tokenContract, // token contract address
  decimals, // decimals of contract
  amount, // string with amount of tokens to send
  blockhash // current block hash
) {
  // Derive token account from 'from' address
  const fromTokenAccount = sol.tokenAddress(tokenContract, fromAccount);
  // Common token options
  const tokenOpt = {
    source: fromTokenAccount,
    amount: sol.parseDecimal(amount, decimals),
    decimals,
    mint: tokenContract,
    owner: fromAddress, // owner of source
  };
  // If address is on curve, it is probably not 'associated token contract'
  if (sol.isOnCurve(toAddress)) {
    // Derive token account from solana account
    const toTokenAddress = sol.tokenAddress(tokenContract, toAddress);
    const [addrInfo, assocInfo] = await Promise.all([
      solAccountInfo(toAddress),
      solAccountInfo(toTokenAddress),
    ]);
    // toTokenAddress -- is valid token account, we can send here
    if (isValidTokenAccount(tokenContract, assocInfo, toAddress)) {
      // Associted account is ok, send to toTokenAddress
      return sol.createTxComplex(
        fromAddress,
        [sol.token.transferChecked({ ...tokenOpt, destination: toTokenAddress })],
        blockhash
      );
      // toTokenAddress is not valid token account, but toAddress is (even if it is on-curve)
    } else if (isValidTokenAccount(tokenContract, addrInfo)) {
      // account is actually token account, send to address. But since we don't know
      return sol.createTxComplex(
        fromAddress,
        [sol.token.transferChecked({ ...tokenOpt, destination: toAddress })],
        blockhash
      );
      // There is no valid token accounts, but toAddress is basic solana account and we can create
      // token account for it
    } else if (addrInfo && addrInfo.owner === sol.SYS_PROGRAM) {
      // try to create assoc address and send tokens to it
      return sol.createTxComplex(
        fromAddress,
        [
          sol.associatedToken.create({
            source: fromAddress,
            account: toTokenAddress,
            wallet: toAddress,
            mint: tokenContract,
          }),
          sol.token.transferChecked({ ...tokenOpt, destination: toTokenAddress }),
        ],
        blockhash
      );
    } else {
      // We probably can create associated account here, even if account doesn't exists, but it is probably typo and funds will be lost
      throw new Error(
        `SOL.createTx: invalid token destination address, account=${toAddress} doesn't exists, associated=${assocAddress} doesn't exists`
      );
    }
  } else {
    // Address is off-curve: which means it should be associated token account
    const info = await solAccountInfo(toAddress);
    // We cannot create associated address here, since given address is already off-curve
    if (!isValidTokenAccount(tokenContract, info))
      throw new Error(
        `SOL.createTx: invalid token destination address=${toAddress}, off-curve and invalid`
      );
    // Valid token addr, send to it. Send to address
    return sol.createTxComplex(
      fromAddress,
      [sol.token.transferChecked({ ...tokenOpt, destination: toAddress })],
      blockhash
    );
  }
  throw new Error('SOL.createTx: unexpected case');
}

Network

import * as net from 'micro-sol-signer/net.js';
// Docs available in src/net.ts

The section should be written; for now check out source code for network-related methods, like fetching balances, or sending txs.

No real network calls are done in the library for simplified auditing. When network needs to be used, JSON-RPC compatible provider is required. We have one in micro-ftch and it's recommended for usage.

ABI/API

There is no official ABI for Solana (in comparison with ethereum), but it is actually not a big deal, since you will need to write API on top of raw ABI anyway. We have small DSL, based on micro-packed, which allows to define ABI easier: look at sol.token definition in index.ts.

License

MIT (c) Paul Miller (https://paulmillr.com), see LICENSE file.