Which Bitcoin addresses sent funds

[rosebaby3892]

The Bitcoin Blockchain (The Database): As discussed, the Bitcoin blockchain is a public, distributed ledger that records transactions. It contains data about:


Which Bitcoin addresses received funds.
The amounts transferred.
Cryptographic proof (digital signatures) that bitget database the sender authorized the transaction.
Timestamps, block numbers, and other metadata to secure the chain.
It does NOT store your private key. It also doesn't store your public key directly in the transaction output (though it's derived from it and revealed when spending). Your Bitcoin address, which is a hashed and encoded version of your public key, is what's publicly visible on the blockchain.
Private Keys: Your Secret "Password"

A Bitcoin private key is essentially a very large, secret random number (a 256-bit number).
It is the sole proof of ownership of the Bitcoin associated with a particular Bitcoin address.
It gives you the ability to "spend" (authorize) transactions from that address. Without the private key, you cannot move the Bitcoin.
The private key is used to generate a public key through a one-way cryptographic function (Elliptic Curve Digital Signature Algorithm - ECDSA).
The Bitcoin address is then derived from the public key.