An altcoin is any cryptocurrency other than Bitcoin, but "creating an altcoin" in the full sense means launching a native coin on its own network. You can fork an existing codebase, build an application-specific chain with a framework, or launch a rollup; each route trades speed for control, and every one leaves you responsible for keeping a network secure.
If you only need a tradable asset for an app, a token on an existing chain is faster, cheaper and inherits stronger security; the cryptocurrency development guide compares coins and tokens. This page is for teams who have a real reason to run their own network.
Good and bad reasons to launch a coin
Good reasons tend to be technical: you need a custom fee market, a specialized virtual machine, control over block space for a high-volume application, privacy features unavailable elsewhere, or sovereignty over upgrades. Bad reasons are usually marketing: "a coin sounds more serious than a token", or "we want our own exchange listing". Exchanges, wallets and custodians must do integration work for each new chain, so a native coin is harder to list than a standard token, not easier.
The main routes compared
| Route | What you start from | Security source | Effort | Typical fit |
|---|---|---|---|---|
| Fork Bitcoin or Litecoin | C++ UTXO codebase with proof of work | Your own miners' hashrate | Low to start, high to maintain | Payment coins; mostly a legacy approach today |
| Fork an existing PoS chain client | An EVM-compatible or other proof-of-stake node | Your validator set's stake | Medium | Teams wanting EVM compatibility with their own validators |
| Cosmos SDK with CometBFT | A Go framework for application-specific chains with BFT consensus | Your validators, optionally shared security arrangements | Medium to high | Appchains with custom modules and IBC interoperability |
| Polkadot SDK (Substrate) | A Rust framework with modular runtime "pallets" | Own validators, or Polkadot's shared security as a parachain | High | Chains wanting forkless runtime upgrades and Polkadot connectivity |
| Rollup frameworks (OP Stack, Arbitrum Orbit, ZK stacks) | A layer 2 or layer 3 settling to Ethereum or another L2 | Inherited from the settlement layer, plus your sequencer | Medium, often via rollup-as-a-service vendors | EVM apps needing dedicated block space |
| Avalanche L1 (formerly subnets) | A custom chain using Avalanche's tooling | Your own validator set | Medium | Permissioned or app-specific EVM chains |
On rollups, the native gas token can be your own, which technically makes it a coin of that chain, while transaction ordering and data availability depend on the stack you choose. For Polkadot-specific detail, see the Polkadot development guide.
Parameters you must decide at genesis
Consensus and security
Proof of work requires enough hashrate that renting a majority is expensive. A new chain using a popular algorithm such as SHA-256 or Scrypt competes with far larger networks whose miners could temporarily redirect power to attack you. Proof of stake ties security to the value of staked coins, which is small for a new coin. Either way, early networks are fragile.
This is not theoretical. Ethereum Classic suffered several 51% attacks in 2019 and 2020 that enabled double spends against exchanges, and Bitcoin Gold was attacked in 2018 and again in 2020. Both were established, listed coins. A brand-new fork has far less protection. The Bitcoin mining guide explains the economics of hashrate that underpin this risk.
Monetary policy
- Supply schedule: fixed cap with halvings, perpetual low inflation, or emission tied to staking participation.
- Premine and allocations: any coins created at genesis for founders or a treasury will be scrutinized. Disclose them, and lock them in vesting.
- Block reward and fees: who earns what, and whether fees are burned.
Network parameters
Block time, block size or gas limit, difficulty adjustment algorithm (for PoW), unbonding period and slashing conditions (for PoS), address format and chain ID. A fork that keeps the parent's chain ID or address prefixes invites replay attacks and user confusion, so change them.
The work after the code compiles
Launching the network is the start of the job. Operators of a new chain need:
- Seed nodes and a bootstrapped validator or miner set that is not entirely run by the founding team.
- A block explorer and public RPC endpoints with rate limiting.
- Wallet support: a reference wallet, plus hardware wallet integration if you want serious holders. See the wallet development guide.
- Exchange integration documentation: confirmation counts, node setup, memo handling, and a stable release cadence. Exchanges weigh the cost of running your node against expected volume; the exchange listing guide covers what they assess.
- Security process: responsible disclosure, coordinated upgrades, and the ability to ship emergency releases.
- Upstream tracking: if you forked Bitcoin Core or a client, you must merge security fixes from upstream indefinitely. Many abandoned forks still run years-old vulnerable code.
Interoperability and bridges
A new chain with no connection to existing liquidity is isolated: users cannot bring stablecoins in, and your coin cannot reach the venues where people trade. Every route has a different answer. Cosmos SDK chains get IBC, a light-client-based protocol for moving tokens and messages between chains that support it. Polkadot SDK chains connected as parachains use XCM messaging. Rollups inherit a canonical bridge to their settlement layer, though withdrawals from optimistic rollups carry a challenge period of about a week unless users go through third-party liquidity bridges.
Everything else relies on external bridges, which have been among the most exploited pieces of crypto infrastructure. Harmony's Horizon bridge lost around $100 million in 2022 after attackers compromised a small multisig, and other bridge hacks that year were larger. If your chain depends on a bridge, treat its security model (multisig, validator set, light client or proof-based) as part of your chain's security model, and say so to users.
Choosing a framework: a short checklist
- Do you need EVM compatibility? If your developers and users live on Ethereum tooling, a rollup or EVM-based chain avoids rewriting contracts and wallets.
- Who will validate? A sovereign PoS chain needs dozens of independent validators willing to run infrastructure for your coin; a rollup needs only a sequencer to start.
- How much customization is needed? Custom fee logic or native modules favor Cosmos SDK or Polkadot SDK; standard smart contracts favor a rollup.
- Which language does your team know? Go for Cosmos SDK, Rust for Polkadot SDK, Solidity plus infrastructure skills for rollups, C++ for Bitcoin-derived forks.
- What is the exit plan? If the chain fails to gain usage, can applications migrate elsewhere without stranding users' assets?
A realistic launch process
- Write a technical specification justifying why a new chain is needed and which framework fits.
- Prototype on a local network, then run a public testnet for months, inviting outside validators or miners.
- Commission security reviews of consensus changes, custom modules or pallets, bridges and the genesis file.
- Recruit independent validators or mining pools before mainnet, and document node operations.
- Launch mainnet with conservative parameters, transfers possibly disabled until the validator set stabilizes.
- Build ecosystem integrations: explorers, wallets, bridges, exchanges, and developer documentation.
Cost and timeline: reasoned estimates
A cosmetic fork of a PoW codebase can be compiled in days, which is why thousands of them exist and most are now dead. A credible chain is different. As an estimate, a Cosmos SDK or Substrate-based chain with a few custom modules typically needs four to eight engineers (protocol, Go or Rust, DevOps, front end) for six to twelve months before mainnet, followed by a permanent core team. Rollup-as-a-service vendors can stand up an L2 in weeks for a monthly fee, but sequencer operations, bridging and ecosystem work remain your responsibility. Security audits for consensus-level code are costlier than token audits and take longer to schedule.
Legal considerations
Selling coins before or at launch can be a securities offering in the US and elsewhere. In the EU, MiCA requires a compliant white paper for many public offers and admissions to trading. Mining or staking-only distribution reduces but does not eliminate these questions; premines and team allocations attract scrutiny.
Frequently asked questions
What is the easiest way to create an altcoin?
Technically, forking a Bitcoin-derived codebase and changing parameters. Practically, that is the route most likely to produce an insecure, unmaintained chain. A rollup or framework-based chain is more work but far more viable.
Can I make my own coin without coding?
Token generators let you deploy a token without code, but that is a token, not a coin. Running your own chain requires engineering and operations skills on an ongoing basis.
Should my coin use proof of work or proof of stake?
For new networks, proof of stake or inherited rollup security is usually safer: a small PoW coin can be attacked with rented hashrate. PoW makes sense mainly when you want a specific mining community and accept that risk.
How do I get an altcoin listed on exchanges?
Exchanges assess security, liquidity, legal status and integration cost. Clear node documentation, a track record of stable releases and real usage help; paying an intermediary who promises a listing does not.
What is a premine?
Coins created at genesis rather than earned through mining or staking. Large undisclosed premines are a red flag to users and exchanges; disclosed, vesting allocations are standard.
Do I need my own blockchain for a game or app?
Usually not. Dedicated block space helps only at high transaction volumes; most apps launch on an existing L1 or L2 and move to an appchain or rollup if usage justifies it.