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How big is the computational effort for an attacker to create a valid address that has the same M characters at the beginning and the same N characters at the end? … It's pretty easy to make addresses with are visually similar to one another, here only targeting the start of the address but there's no particular reason why it couldn't target the end as well. 18eXmgR5Svoqqa6PaYVrKvbH6hvrp5xe3A …

The story is I sent some bitcoin to an exchange using an address I've used with them before, but then found out that they had just retired/stopped using that address. … There is no reason to ever "stop using" an address, especially as the one you're referencing contains over half a million dollars of value. …

A single output is roughly 34 bytes per output regardless of whether the output represents a standard address or multisig address. Is this correct? … Yes, in modern Bitcoin transactions the size of producing an output (ie, paying to an address) is constant and has no relation to the size of the actual script. …

Electrum servers are simply not compatible with Bitcoin Core on a development or operational level. They require a vast amount of indexes created which the node does not have, and must be created by a …

Repeating this if you want to monitor a new address with potentially old entries. You need confidence that your code is correctly accounting, which is only something you can ensure. …

In the "elements project" nomenclature a confidential address is an encoding of a P2PKH key which includes the necessary information to make a confidential transaction, one which uses range proofs to blind … There's nothing confidential about the address itself, it's functionally just a public key as normal. …

BIP0021 (the contents of a QR code) does not specify a method for defining multiple addresses.

You can identify some types of wallets by their behaviour, say using uncompressed keys rather than compressed ones, but this isn’t something directly revealed by any transaction. There is no specific …

You give out a single address, as with a normal wallet. The master private key and master public key are both for use locally and should never be shared with any party, especially not the former. …

Breadwallet creates a new address every time you use the one displayed. There is no manual way of creating a new one manually. …

Early renditions of the Bitcoin client did use raw public keys in this way for pay-to-IP-address transaction orders, it's still valid to spent an output to <raw pubkey> OP_CHECKSIG, though miners might … Before an output owned by a fresh address is spent, the hidden public key points are unknown to anybody but the creator. …

Any reused nonce is a problem, it's not restricted to a single transaction. No competent software will ever reuse nonces accidentally, so using a scanning script like that is just ruining your priva …