Taint is the concept that certain bitcoin are riskier or less acceptable because of their previous owners or possible links to illegal activity.
The Taproot upgrade is described in BIPs 340, 341, and 342, and introduces the Schnorr signature scheme, Taproot, and Tapscript.
tBTC is an abbreviation for testnet bitcoin. Testnet is an alternate version of the Bitcoin blockchain with its own token.
Testnet is a parallel blockchain to Bitcoin’s blockchain, used solely for testing and development. The testnet network has a separate token which has no monetary value.
A Bitcoin transaction can be created such that the recipient of the outputs cannot spend them before a specified time. This time can be specified in UTC time or block height.
A transaction exists as a record of the transfer of bitcoin from one address to another. All transactions are recorded in blocks on the blockchain.
A txid or Transaction ID is simply the (double) SHA-256 hash of a transaction. This hash is used to uniquely identify the transaction on the blockchain.