Chainlink

Ethereum is an open-source, public blockchain platform (initially proposed by Vitalik Buterin and developed by the Ethereum Foundation and a global developer community) that executes smart contracts and hosts decentralized applications (dApps) using the native cryptocurrency Ether (ETH). The protocol runs as a permissionless network of node client implementations (e.g., Geth, Erigon, Besu, Nethermind, Lighthouse), provides the Ethereum Virtual Machine (EVM) for contract execution, uses token standards such as ERC-20 and ERC-721, and after The Merge operates under proof-of-stake with ongoing roadmap work — including scalability (rollups/sharding), security, and topics such as quantum-resistance — specified via EIPs and community governance.

CCIP 2.0 is Chainlink's cross-chain connectivity technology for connecting traditional financial institutions and on-chain systems. The videos describe it as a faster, cost-efficient, and secure bridge that allows companies to add custom security checks.

Tether is a company (Tether Limited) that issues USDT, a fiat-collateralized stablecoin pegged to the US dollar. USDT tokens are issued on multiple blockchains (originally the Bitcoin Omni layer and later on Ethereum as ERC-20, Tron as TRC-20, Solana and others), are used as a dollar-referenced medium for trading and settlement across exchanges and wallets, and Tether's reserves and audit practices have been the subject of regulatory scrutiny and periodic attestations by accounting firms.

Ledger is a hardware cryptocurrency wallet and digital-asset management platform. Its hardware signers are used to manage and authorize transactions for cryptocurrencies including Bitcoin, Ethereum, Solana, XRP, stablecoins and other supported assets, while Ledger Wallet provides functions such as buying, swapping, staking, spending and portfolio tracking. The platform also compares rates from cryptocurrency providers across multiple chains and offers services including Ledger Recover.