Mainnet: Sunday 8 November 2026The exact launch time will be added to this post and to opacra.org by Wednesday 4 November. At that minute the mainnet download goes up on opacra.org and mining opens to everyone at the same time.
The mainnet genesis block is made on the morning of launch day and carries a news headline from that morning, and the code refuses any block dated before the announced launch time. Nobody, the project included, can mine a single block early.
No premine. No ICO, presale or private sale. No airdrop. Full block rewards from block 1.
What Opacra isOpacra is a private coin with its own blockchain, built on Monero's code (v0.18.5.1, with Monero's fixes up to v0.18.5.4). The privacy layer is Monero's, unchanged: it doesn't invent its own cryptography.
- Private by default: every payment hides the sender, the receiver and the amount (ring signatures with 16 members, stealth addresses, RingCT, Bulletproofs+, Dandelion++).
- Auditable by choice: the owner can prove a payment (payment proofs), a balance (reserve proofs), or give someone a view-only wallet.
- 30-second blocks: received coins can be spent again after 10 blocks, about 5 minutes. Mined coins unlock after 60 blocks, about 30 minutes.
- Mined on ordinary CPUs with RandomOPCA, a RandomX variant with its own salt. LWMA difficulty keeps blocks steady as miners come and go.
Supply- 10,000,000 OPCA on a smooth curve (about 22% emitted in year 1, 71% after 5 years), then 0.05 OPCA a block for ever (about 0.5% a year, falling).
- 95% of each block's new coins go to the miner, plus all fees.
- 5% goes to a development fund at a fixed address in the code, with a published view key, so anyone can check every coin it receives.
Fund address:
Pa2TDAomGjCM7y1s2S2APLcrGqhkddoyRgsx2Miqu2eRJKLcayF84VPea6SMcSDnxeg78smaG9fBeTpVj5EL1wbU81m8HT6rPW
Fund view key:
69416fd0f64a86d2f3053d9ec1ed072daa83e8970d5fb7c63ab81657834a0101
The fund's keys are kept offline. Wallets never use fund coins as decoys, so the fund's public view key doesn't weaken anyone else's privacy. Every payment the fund makes will be published with its transaction ID and payment proof.
Protecting a young chainNew proof-of-work chains are easiest to attack in their first weeks. Opacra publishes emergency checkpoints, signed with DNSSEC under opacra.org and opacra.com (both must agree). The seed nodes, pools and exchanges follow them; home miners' nodes warn if their chain disagrees, and opacra.org would ask miners to follow them only during an actual attack. A daily checkpoint is published during the early weeks, and every one is logged.
The public testnet is running nowTestnet 3 started on 26 October 2026 and runs mainnet's exact rules with the same software, Opacra v1.0.0 (Windows and Linux, 64-bit). Download it from
opacra.org, start it, and it creates a wallet and mines. Then send a private payment and look it up on the explorer: only you can decode it.
Testnet coins have no value and never become mainnet coins. Testing is how you help: if something breaks or is unclear, post here or email
support@opacra.org.
Being open about it- The code has been reviewed by an experienced cryptocurrency developer. It has not had a professional security audit. This is experimental software.
- The founder will mine from the launch minute with a few home computers, on exactly the same terms as everyone else.
- Releases are signed with the Opacra release key, fingerprint D861 7219 6FEC AAB6 84F5 B3FD CB65 D212 D0B1 162B. The Windows programs aren't code-signed yet, so Windows may ask you to choose "Run anyway".
- There are two seed nodes today (Europe and the US). They don't keep logs of where payments come from. More seed nodes at other providers come after launch.
Official links and safetyOpacra's only accounts are this thread,
@opacra_org on X and the
Opacra Discord. Downloads come only from
opacra.org. The team never messages you first, and never asks for your 25 words, your password or a payment. OPCA isn't listed on any exchange; any listing will be announced here and on opacra.org only once trading is live.
Opacra is experimental software. Nothing here is investment advice, and nobody guarantees OPCA will have any value.
