Clear DefinitionsSemi‑Fungible Token
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Pronunciation
[sem-eye fung‑uh‑buhl to-ken]
Analogy
A semi‑fungible token is like a gift card series where cards of the same value are interchangeable, but each card has unique metadata once redeemed.
Definition
A token standard (e.g., ERC‑1155) that allows both fungible and non‑fungible representations within the same contract.
Key Points Intro
SFTs combine token types via:
Key Points
Multi‑token: Single contract handles multiple token IDs.
Fungible IDs: Some IDs represent interchangeable tokens.
Non‑fungible IDs: Other IDs represent unique items.
Batch operations: Efficient transfers of mixed token types.
Example
A game issues SFTs: token ID 1 represents gold coins (fungible), ID 1001 represents a unique sword (non‑fungible).
Technical Deep Dive
ERC‑1155 defines `safeBatchTransferFrom` and `balanceOfBatch`. Each `id` has its own `balances[id][owner]`. Metadata URI uses `{id}` substitution. Contracts emit `TransferSingle` or `TransferBatch` events.
Security Warning
Batch operations can exceed gas limits; limit batch sizes.
Caveat
Complexity of multi‑token logic may introduce edge‑case bugs.
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