What is Beam?
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🟢 The simple version
Plain English — no jargon. Start here.
Beam is a privacy-focused cryptocurrency implementing the MimbleWimble protocol — a fundamentally different blockchain design where transaction amounts are hidden, no addresses exist at all, and the entire transaction history can be compressed into a compact form without losing verifiability.
MimbleWimble — the protocol named after a Harry Potter spell
MimbleWimble is a blockchain protocol published anonymously in 2016 by someone using the pseudonym "Tom Elvis Jedusor" (Voldemort's real name in French) — the paper appeared on a Bitcoin development IRC channel with no author identity. A follow-up paper was published by "Ignotus Peverell" (the oldest of the Peverell brothers in Harry Potter). The whimsical names notwithstanding, the protocol represents a genuine cryptographic breakthrough in blockchain privacy and scalability.
The core insight: Bitcoin's blockchain is essentially a list of unspent transaction outputs (UTXOs). MimbleWimble eliminates addresses entirely — instead, transactions are verified using cryptographic commitments (Pedersen commitments) that hide amounts while allowing mathematical verification that inputs equal outputs. The result: no addresses to trace, no amounts visible, and — crucially — the blockchain can be compressed dramatically because spent outputs can be eliminated entirely.
How Beam implements MimbleWimble
Beam launched in January 2019 as one of the first two MimbleWimble implementations (alongside Grin). Beam's approach is more "business-friendly" than Grin's — it has a development company (Beam Privacy), a treasury model (20% of block rewards for development), and has built an entire ecosystem including Confidential Assets (private tokens on Beam), a DeFi layer, and atomic swaps.
What BEAM token does
BEAM is the native currency for privacy-preserving transactions on the Beam network. BEAM is also used for paying fees in the Beam DeFi ecosystem. Block rewards decrease on a halving schedule similar to Bitcoin. Total supply: ~262 million BEAM. 20% of block rewards go to the Beam treasury for development.
Is it legal in India?
Yes. BEAM is a VDA under Indian law. 30% tax and 1% TDS apply. See India regulation.
🟡 A bit more detail
For when you want to go a little deeper.
Cut-through — MimbleWimble's scalability property
MimbleWimble's most remarkable property is "cut-through" — the ability to eliminate intermediate transaction history while preserving verifiability. If Alice sends to Bob, and Bob later sends to Carol, the intermediate Bob-to-Carol transaction can be eliminated from the blockchain entirely. Only the net result matters: Alice's original coins become Carol's coins. An observer can verify that the chain is valid (no coins created or destroyed) without seeing the intermediate steps.
This means a MimbleWimble blockchain can be validated from genesis using only a fraction of the data of a standard blockchain. A full node does not need to download the entire transaction history — just the current UTXO set and the chain headers. This "scalability by design" was a key motivation for the protocol's inventors.
Beam has built a broader DeFi ecosystem than most privacy coins. Beam DeFi includes a DEX (BeamX), atomic swaps with Bitcoin and other chains, a confidential stablecoin proposal, and Confidential Assets (private tokens that can be issued on Beam — the privacy equivalent of ERC-20 tokens). Beam's node supports a "one-sided payment" extension (LelantusMW) that allows sending to a static address without interaction — solving a usability problem with pure MimbleWimble where senders and receivers normally must interact to complete a transaction.
Confidential Assets and BeamX
Confidential Assets allow anyone to issue private tokens on the Beam blockchain — tokens whose existence, amounts, and holders are all hidden, just like BEAM itself. BeamX is Beam's AMM DEX that supports trading between BEAM and Confidential Assets with full privacy. This creates a private DeFi layer where even the tokens being traded are not visible to outside observers.
Key Beam metrics: transaction volume, BeamX DEX activity, Confidential Asset count, development activity (GitHub commits, protocol upgrades), and treasury usage transparency. Beam's DeFi ambitions distinguish it from simpler privacy coins. The "one-sided payments" innovation (LelantusMW) is particularly important for practical adoption. Live data: CoinGecko · Beam Explorer.
🟣 The full technical picture
For the technically curious.
MimbleWimble protocol: Pedersen commitments and blinding factors
MimbleWimble uses Pedersen commitments to hide transaction amounts. A Pedersen commitment C = r·G + v·H, where r is a blinding factor (a secret random number), v is the value (amount), G and H are elliptic curve generators. The commitment hides v while allowing addition: C₁ + C₂ = (r₁+r₂)·G + (v₁+v₂)·H. This additive homomorphism allows transaction validation: the sum of input commitments equals the sum of output commitments plus fee commitment, proving no coins were created or destroyed, without revealing any individual values. The blinding factors serve as ownership proof — knowing r is equivalent to owning the funds.
Sources: Jedusor, T.E. (2016). MimbleWimble. docs.beam.mw/Mimblewimble.pdf · Peverell, I. (2016). Introduction to MimbleWimble and Beam. docs.beam.mw/BEAM_Position_Paper_v0.2.2.pdf · Beam docs: documentation.beam.mw
Range proofs — preventing negative values
Pedersen commitments hide values but do not prevent negative values (which would allow creating coins). To prevent this, MimbleWimble requires a range proof for each output — a zero-knowledge proof that the committed value is a non-negative number within a valid range. Beam uses Bulletproofs for range proofs — a highly efficient ZK proof system that produces short proofs (O(log n) in the range size) without a trusted setup. Bulletproofs allow Beam to prove an output value is between 0 and 2⁶⁴ in under 1KB of proof data per output.
Beam's "Laser Beam" payment channel protocol enables off-chain BEAM transactions similar to Bitcoin's Lightning Network. Two parties lock funds in a channel contract and exchange signed channel updates off-chain. The channel settlement transaction (the final state) is the only transaction recorded on-chain. Since all Beam transactions are private, channel settlements are also private — unlike Bitcoin's Lightning Network where channel funding and closing transactions are transparent on-chain. Beam's payment channels use the same Pedersen commitment structure as regular transactions, maintaining the full privacy model even for off-chain payments.
Key facts
- Protocol: MimbleWimble (Pedersen commitments, cut-through)
- Range proofs: Bulletproofs (no trusted setup)
- Privacy extensions: LelantusMW (one-sided payments)
- DeFi: BeamX DEX + Confidential Assets
- Payment channels: Laser Beam
- BEAM supply: ~262 million (max)
- Treasury: 20% of block rewards
- Founded: 2019 (Beam Privacy company)