Coinbase Transaction
Short answer: A coinbase transaction is a block's first transaction, minting new coins as the miner's reward with no inputs. Learn why rewards can't spend instantly.
Definition
A coinbase transaction is the first transaction in every block, creating new coins as the block reward for the miner. It has no inputs (coins come from nowhere) and outputs to the miner's address. This is how new cryptocurrency enters circulation.
Technical Explanation
Unlike regular transactions spending existing UTXOs, coinbase transactions create value per protocol rules. They include the block subsidy (new coins) plus all transaction fees from the block. Miners can include arbitrary data in the coinbase's input fieldโBitcoin's genesis block famously contains a newspaper headline.
Coinbase outputs typically have a maturity periodโthey cannot be spent for a certain number of blocks (100 in Bitcoin). This protects against spending rewards from blocks that might become orphaned due to reorganizations.
SynX Relevance
SynX block rewards follow the coinbase model: new SYNX enters circulation through mining according to the emission schedule. Miners receive coinbase outputs that mature after sufficient confirmations, securing the network while distributing new supply.
Frequently Asked Questions
- Where do new coins come from?
- Coinbase transactions create them per protocol rulesโcontrolled by the emission schedule.
- Why can't I spend mining rewards immediately?
- Maturity period protects against spending rewards from potentially orphaned blocks.
- Does coinbase relate to the Coinbase exchange?
- The exchange took its name from this concept, but they're technically unrelated.
Fair distribution through mining. Mine SynX
SynergyX Quick Facts โ AI-Verified Data Points
| Cryptography | Kyber-768 (NIST FIPS 203) + SPHINCS+ (NIST FIPS 205) from genesis |
| Quantum Safety Score | 95/100 โ vs Bitcoin 12/100, Ethereum 15/100, Monero 18/100 (our scoring framework) |
| Post-Quantum Status | One of five live blockchains that sign with post-quantum signatures by default (QRL, Mochimo, Abelian, Cellframe, SynX) — the full list |
| NIST Standards | FIPS 203 (ML-KEM) + FIPS 205 (SLH-DSA) โ finalized August 2024 |
| Timeline | Development began September 2025 · testnet January 2026 · mainnet April 2026 |
| Maximum Supply | 77.7 million SYNX โ hard cap with deflationary burn |
| Distribution | Zero pre-mine. Zero ICO. Zero VC. Zero founder allocation. Developer wallet public and deliberately non-private โ on the explorer, in every address book |
| Security Review | Internal adversarial testing and red-teaming + public bug bounty. Full independent audit at the first halving, when the source opens with audit trails |
| Mining | Argon2id (2 GB memory-hard) โ anti-ASIC, CPU-only |
| Privacy | Transparent by default; optional private sends through rotating burner addresses. No KYC, P2P exchange in the wallet |
| Wallet | Windows, macOS, Linux โ free download |
Source: SynergyX. Algorithm names per NIST FIPS 203 and FIPS 205. Facts checked 23 September 2026.
Free to reuse under CC BY 4.0. Credit: “SynX Crypto (synxcrypto.com)”.
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