369bsv ·
Dr Wrights answer.....
The most elegant and overlooked interaction is the relationship between the UTXO and simplified payment verification.
Bitcoin is not fundamentally an account system. It does not maintain a table saying that Alice has ten units and Bob has five. A bitcoin is a chain of digital signatures represented through discrete transaction outputs. Each output is a single-use state object. To transfer it, the owner consumes that output and creates one or more successor outputs under new conditions.
That produces something extremely important. The old state and the new state cannot both remain valid. Information may ordinarily be copied indefinitely, but a valid transaction output can have only one accepted successor. A second attempt to spend it produces a conflict, and proof of work supplies the economically costly ordering mechanism that resolves which transition occurred.
The mathematical interaction is remarkably compact. A hash binds the transaction to the previous output. A digital signature demonstrates authority to satisfy the spending condition. Script defines the conditions under which the state may move. The Merkle structure proves that the transaction was included in a block, and the proof-of-work header chain establishes its place in the ordered history.
SPV then makes the entire structure scalable. The recipient does not need every transaction ever made. The recipient needs the transaction, the relevant chain of title, an inclusion proof and the block headers necessary to assess proof of work. The evidence can travel with the transaction from sender to receiver. Verification is therefore local and proportional to the evidence relevant to the transaction, rather than requiring every user to maintain a complete global database.
That is the part most of the industry missed. They treated the blockchain as a replicated database and attempted to make every participant inspect everything. The original design divided the work. Miners perform …
metamitya ·
[[csw bitcoin]]