Metadata

Data contains information on other data, such as details about a particular transaction's properties.

Mainnet

A mainnet is a separate blockchain that operates on its own network using its own protocol and technologies.
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Off-Chain

All network users can see on-chain transactions because they are recorded on the distributed ledger. Off-chain transactions, however, take place away from the blockchain network
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Bitcoin Halving

A blockchain event known as a "halvening" (or "Bitcoin halving") causes block subsidies or rewards for validating transactions to be reduced by half.
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