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When a node sees a transaction on a connected network, it writes it to what's called a "witness transaction". A witness is a message from a node that says, "I saw that". So it could be:
- "I saw someone send 1 BTC to YAR ";
- "I saw someone change the status of data on YAR ";
- Or, "I saw someone change the status of a smart contract on YAR ".
All nodes send witness transactions to the system all the time. Witness transactions have a standard structure, regardless of which network they originate from. A Bitcoin transaction is different from a BNB SmartChain transaction, but in YAR they look the same.