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*[[Hardfork]], a change to the protocol that makes previously invalid events valid ...

...to the bitcoin protocol that makes previously invalid blocks/transactions valid, and therefore requires all users to upgrade. ...tructure (including block hash), difficulty rules, or increases the set of valid transactions is a hardfork. ...

A block is valid if it obeys all of the [[Protocol rules]]; otherwise it is invalid. ...

A '''softfork''' is a change to the bitcoin protocol wherein only previously valid blocks/transactions are made invalid. Since old nodes will recognize the new blocks as valid, a softfork is backward-compatible. ...

...was a service that allowed a raw transaction in hex to be checked and, if valid, transmitted over the network. The service was first made available on Nove ...

...3.4 valid when enough contributors participate and the transaction in 3.5 valid when nLockTime expires ...can combine to make the output valid when signed by the vendor, creating a valid transaction sending that money to the arbitrators, which only agree to rele ...

Here we analyze the [[nonce]] values and [[hash|hashes]] for all the valid blocks in the [[blockchain]]:<ref>https://bitcoin.stackexchange.com/q/36414 ...plot readily shows that the distribution of [[nonce|nonces]] that produce valid [[hash|hashes]] is uniform.<br>[[File:Nonces vs Hashes.png|verba alia]] ...

...by some Bitcoin pools by which notifications are sent to all miners when a valid block has been generated and added to the blockchain. This serves the purp ...

* If there is no item on the top of the stack or the item is not a valid script then transaction validation fails. # Attacker creates an OP_EVAL transaction that is valid as seen by old clients, but invalid for new clients. ...

...s an amount of bitcoins he is willing to buy (minimum 0.5 BTC), provides a valid Bitcoin address and selects either “Western Union” or “MoneyGram” as a paym ...r, determining the amount of bitcoins he is willing to purchase, provide a valid Bitcoin wallet address and select one of the two payment options. ...

* Low block confirms until a block is valid on all pools!! ...

==Range of valid ECDSA private keys== ...FFFF FFFF FFFF FFFF FFFF FFFE BAAE DCE6 AF48 A03B BFD2 5E8C D036 4140 is a valid private key. ...

...ntil recently set nLockTime to <code>0</code>, meaning the transaction was valid in any block. Starting with [[Bitcoin Core]] 0.11.0, every normal transact ...LTV-based timelock has expired before the transaction may be included in a valid block. ...

...acks. A chain is valid if all of the blocks and transactions within it are valid, and only if it starts with the genesis block. ...r anything. When the bitcoin client switches to another, longer chain, all valid transactions of the blocks inside the shorter chain are re-added to the poo ...

Thus, not paying tax is a valid form of dissent. ...

* Payout available as soon as a valid block is found. ...

...ells Bitcoin mining contracts from 50 GH/s to no limits. All Contracts are valid for one year. ...

* This offer is only valid during periods of low volatility, defined as follows: the 24-hour MtGox hig * This offer is only valid so long as the MtGox data feed for the last 24 hours is available and belie ...

...and stale blocks are two separate things: both are not part of the longest valid chain, but in an orphan block it is because the parent is ''unknown'', wher ...

A timestamp is accepted as valid if it is greater than the median timestamp of previous 11 blocks, and less ...