Token standards - Qustody

Quantum Chain defines a family of QRC token standards that mirror the operational shape of widely-used Ethereum-style standards. Contracts are written in Solidity, executed by the QVM, and authorized with post-quantum signatures.

Standards summary

Standard	Type	Typical use case	Key operations
`QRC-20`	Fungible token	Stablecoins, utility tokens, institutional balances	`transfer`, `mint`, `burn`, `approve`
`QRC-721`	Unique non-fungible token	Unique assets, certificates, ownership records	`mint`, `transfer`, `burn`
`QRC-1155`	Multi-token collection	Mixed token sets, batched assets, gaming-style collections	`mintBatch`, `transferBatch`, `burnBatch`
`QRC-1400`	Regulated security-style asset	Issuance and redemption flows with transfer controls	`issue`, `redeem`, `controllerTransfer`
`QRC-3643`	Permissioned regulated token	Identity- and compliance-aware assets	`mint`, `burn`, `freeze`, permissioned `transfer`
`QRC-4626`	Tokenized vault	Vault shares, tokenized strategies	`deposit`, `withdraw`, `redeem`
`QRC-3525`	Semi-fungible token	Financial positions, tranches, structured products	`mint`, `split`, `merge`, `transfer`

What every QRC standard inherits

Address format: 20 bytes, derived as Keccak-256(publicKey)[12:32] from a post-quantum public key.
Bytecode and opcodes: identical to Ethereum at the QVM layer.
Authorization: every transaction is signed with a post-quantum signature and verified by the precompile at 0x0b.
Gas accounting: the gas table matches the EVM Berlin/London rule sets.

What changes vs Ethereum

The ecrecover precompile is removed. Any QRC contract that needs in-contract signature verification must call the post-quantum precompile at 0x0b. See QVM vs EVM.
Tooling that derives keys via BIP-32 / BIP-44 is not applicable to post-quantum keys. Wallet integrations must use Quantum Chain key generation.
EIP-2612 style permits are not portable as-is and are tracked as a future workstream.

Picking a standard

Want a fungible balance with mint/burn? Start with QRC-20.
Need uniqueness or non-fungibility? QRC-721.
Mixed inventories or batch operations? QRC-1155.
Regulated workflow with controller transfers? QRC-1400.
Identity-bound investor list? QRC-3643.
Tokenized vault / yield-bearing share? QRC-4626.
Tranches / structured positions? QRC-3525.

Error codes Glossary