This is as close as you can get to cancelling a transaction. Note that this still results in a transaction occurring (and gas being paid for). Connect and share knowledge within a single location that is structured and easy to search. If you can convince people securing the network (currently, BUY XANAX WITHOUT PRESCRITION this is miners) to change their mining software, you can change the rules of the network so that the transaction is reversed.

The legal system may compel the offending party to make good; some countries also can crack the private keys for an Ethereum account. There is nothing in Ethereum itself that allows breaking the rules of Ethereum (obviously?). The closest you can get is to make an amendment to the rules of Ethereum or a one time pardon. Since the current state of the blockchain is based on the history of the blockchain, one way of reversing a transaction is to rewrite the blockchain history starting from at least the block containing the transaction to be reversed. Forking the blockchain intentionally like this may have negative consequences for the overall Ethereum network. One way of replacing an unconfirmed transaction is to repost a replacement transaction with the same nonce but a higher gas price; a possible replacement transaction is to post a 0-value balance transfer with yourself as the recipient.

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It might be a bad idea to set a very low gas limit in case such a transaction is filtered out by a miner. This method can only be used to replace a transaction you have sent. This method works to replace any kind of transaction -- including ones for interacting with contracts such as tokens. If the transaction has not yet been confirmed in the blockchain and is only in the transaction pool, you can replace the transaction.
If you only have a partial address or transaction hash, you would need to obtain the full address or transaction hash in order to search for it using a blockchain explorer. If there exists an inverse to the transaction (e.g. Send 3 DAO tokens from account A to account B has the inverse of sending 3 tokens from B to A), one can execute the inverse transaction. Note that a contract may implement something or an account holder may do something that is not reversible (e.g., it may burn tokens). Also note that this results in two transactions (the original plus the inverse) which both are recorded permanently in the blockchain. This also means that the transaction fees are incurred for both transactions. If you performed a transaction with someone and are unhappy with the outcome, you can try using the legal system.

How can I reverse or cancel a transaction or recover lost ethers?

The reason for this is that addresses and transaction hashes are typically represented by long strings of alphanumeric characters, and searching for partial data would not provide enough information to uniquely identify a specific address or transaction. For example, a transaction hash on the Ethereum blockchain is typically 32 bytes (64 hexadecimal characters) in length, and a partial transaction hash of only 8 hexadecimal characters would not be unique and could potentially match multiple transactions. It is generally not possible to search for partial addresses or transaction hashes using publicly available blockchain explorers like Etherscan. Most blockchain explorers only allow users to search for complete addresses or transaction hashes, and will not return any results for partial or incomplete data. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. In order to search for a specific address or transaction on a blockchain explorer, you would need to provide the complete address or transaction hash.