Blockchain Fundamentals

Tangle

The DAG-based ledger structure IOTA originally used, in which each new transaction confirmed earlier ones rather than waiting for miners to package blocks. IOTA replaced it in 2025 with IOTA Rebased, a smart-contract chain using delegated proof of stake and a different DAG-based consensus, so the Tangle is now mostly of historical interest.

General education, not investment, legal or tax advice. Markets and regulation change quickly: where a definition depends on current law or on a recent event, check the latest coverage before relying on it.