Embedding Arbitrary Data (Limited & Specific Use Cases):

[roseline371277]

Inputs: References to unspent transaction outputs (UTXOs) that you own and are spending.
Outputs: The new UTXOs being created, specifying the recipient's address and the amount they will receive, as well as any change returning to your wallet.
Digital Signature: Your private key is manufacturing email list used to digitally sign the transaction, proving you authorize the spend without revealing your private key.
Fees: An optional fee paid to miners.
Broadcasting: This transaction data is then broadcast to the Bitcoin network.
Mempool: Nodes on the network receive this transaction and hold it in their "mempool" (memory pool) of unconfirmed transactions.
Block Inclusion: Bitcoin miners then "enter" (include) these unconfirmed transactions into new blocks. They gather a selection of transactions from the mempool, add them to a block template, and attempt to find a valid block hash (Proof of Work).
Blockchain Appending: Once a miner successfully finds a valid hash, the block (containing your transaction data) is broadcast to the network. Other full nodes verify the block and, if valid, append it to their copy of the blockchain. This makes your transaction "entered" and permanently recorded on the immutable ledger.
So, the core "data entry" is the act of making a Bitcoin payment, which is automatically bundled, validated, and appended to the chain.


While primarily a financial ledger, Bitcoin's scripting language allows for very limited amounts of arbitrary data to be embedded in transactions. This is often what people are thinking of when they consider "data entry" beyond simple payments.

OP_RETURN: This is the most common and standard method for embedding small amounts of unspendable data into a Bitcoin transaction output.