Reference

Token standard

The exact specification every BRUNE coin shares on BNB Chain and Bitcoin.

BNB Chain token

Property	Value
Standard	BEP-20 with EIP-2612 permit: a Flap Tax Token V3 (a minimal-proxy clone of `0x024f18294970B5c76c0691b87f138A0317156422`)
Address (CA)	Ends in 7777
Supply	1,000,000,000 (10^27 base units)
Decimals	18
Minting	None after creation: the whole supply is minted once, to the Flap Portal, when the token is created
Owner	The Flap Portal. Neither the creator nor BRUNE controls the token
Tax	1% on buys and sells through its pools (1.5% for $BRUNE); plain transfers are never taxed; ends 100 years after graduation
Fee recipient	The coin's BRUNE fee vault, created with it, split fixed forever
Pool	Flap BTCB bonding curve, then a PancakeSwap V2 pool with burned liquidity at ₿0.156 raised

BRUNE verifies every one of these on chain before it etches the Rune.

Metadata file

The token's metadata is a JSON file on IPFS, uploaded through Flap so that Flap, terminals and explorers display it out of the box:

{
  "description": "…",
  "image": "<IPFS CID of the image>",
  "twitter": "https://x.com/…",
  "telegram": "https://t.me/…",
  "website": "https://www.brune.tech/rune/<CA>"
}

The name and ticker are stored in the token contract itself.

Bitcoin Rune

Property	Value
Name	Reserved name assigned by Bitcoin (why), or the name you chose
Divisibility	18
Premine	1,000,000,000 (10^27 units), all to the coin's 2-of-2 custody address
Mint terms	None (no open mint)
Parent inscription	In the etching transaction itself: 256 × 256 logo (at most 4 KiB) with the same metadata plus bep20 (the CA) and chainId 56