"off-chain payments conducting transactions without waiting for confirmation by the bitcoin network. Segregating the signature data allows nodes that arent interested in signature data to prune it from the disk, or to avoid downloading it in the first place, saving resources. When the signature is removed from the transaction, the transaction size is reduced. In May 2017 (not to be confused with the Digital Currency Initiative of the ) announced it had offered a proposal, referred to as SegWit2x the New York Agreement activating Segregated Witness at an 80 threshold of the total Bitcoin hashrate, signaling at bit 4;. It hides its increased block size by changing the definition of a block to be measured as one million "units" instead of bytes.
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Segwit resolves this by including a version number for scripts, so that additional opcodes that would have required a hard-fork to be used in non-segwit transactions can instead be supported by simply increasing the script version. It sometimes takes hours to confirm a transaction. These fake blocks would be detected, but doing so would take a very long time, slowing down the whole system. (For comparison, at a sustained 1 exahash/second, the Bitcoin mining network does 80-bits worth of work every two weeks). Edit Any network node can modify the transaction and broadcast it to the rest. 10 Related BIPs edit BIP141 Segregated Witness (Consensus layer) activated on August 24, 2017 BIP143 Transaction Signature Verification for Version 0 Witness Program 1 activated on August 24, 2017 BIP144 Segregated Witness (Peer Services) activated on August 24, 2017 BIP148 Mandatory activation of segwit deployment. But this meant that malicious people could make up fake "block" data that was very long as a form of (DoS attack). Bitcoin Scaling Plan Segwit2x Leaves More Questions Than Answers, CoinDesk.