Token Supply & Burning Pattern (Lifecycle Control)
Design mint/burn rules, capped supply and admin-controlled burn functions
課題
You need fine-grained control over token supply: capped minting, burn mechanisms, or governance-controlled supply changes.
解決策
Combine a minting contract with burn capabilities. Use a state box to track total supply, enforce caps, and require authorization for supply changes.
仕組み
- 1Deploy a state box holding the minting authority (NFT or special token)
- 2Minting contract checks current supply against cap before allowing new mints
- 3Burns can happen by omission (not including tokens in outputs) or sending to unspendable address
- 4Governance can control mint/burn through multi-sig or DAO voting
- 5State box tracks total minted and total burned for transparency
コード例
These snippets are educational references. Before using them with real funds, pin the exact SDK/compiler versions, validate register encodings, add collection-size guards before indexing arrays, publish test vectors, and keep production deployment behind an explicit review/audit gate.
{
// State box with minting authority
val mintingNFT = fromBase64("MINTING_AUTHORITY_NFT")
// Guard expected shape before reading indexed outputs/registers.
if (CONTEXT.dataInputs.size > 0 &&
OUTPUTS.size > 0 &&
OUTPUTS(0).tokens.size > 0) {
val stateBox = CONTEXT.dataInputs(0)
val safeRegisters =
stateBox.R4[Long].isDefined &&
stateBox.R5[Long].isDefined
if (safeRegisters) {
// Verify authority
val hasAuthority = stateBox.tokens.exists(t => t._1 == mintingNFT)
// Supply tracking in state box registers
val currentSupply = stateBox.R4[Long].get
val maxSupply = stateBox.R5[Long].get
val mintAmount = OUTPUTS(0).tokens(0)._2
// Check cap
val withinCap = currentSupply + mintAmount <= maxSupply
// Governance approval (multi-sig)
val governanceApproved = atLeast(2, Coll(
proveDlog(admin1PK),
proveDlog(admin2PK),
proveDlog(admin3PK)
))
hasAuthority && withinCap && governanceApproved
} else {
false
}
} else {
false
}
}Minting contract with hard cap enforcement. State box tracks supply, governance multi-sig controls minting authority.
ユースケース
- →Deflationary tokenomics (buyback-and-burn)
- →Capped supply governance tokens
- →Fee burning for protocol revenue
- →Proof-of-burn for cross-chain bridges
- →Elastic supply stablecoins
セキュリティ考慮事項
- !Burns are irreversible - double-check amounts
- !Use multi-sig for governance-controlled burns
- !Log burn events for off-chain tracking
- !Ensure state box cannot be destroyed accidentally
リソース
Standard transaction fees. State box updates require additional transaction.