What is a Bitcoin transaction accelerator?
A service, usually run by a mining pool, that tries to include a stuck payment in its next block, sometimes for a charge.
Some mining poolsMining poolA group of miners who share the work of finding blocks and split the rewards, so each gets paid steadily instead of rarely. take a transaction ID out of band and try to include that payment in the blocks they mine. Free places are usually limited, and paid ones are priced by the payment's size rather than its amount.
An accelerator works only when its pool finds a block, so it cannot guarantee confirmation. Replace-by-feeReplace-by-fee (RBF)A way to replace an unconfirmed payment with a conflicting version that pays a higher fee. Only one can remain in the same valid chain. and child-pays-for-parent do the same job through the network itself, without trusting anyone.
An accelerator needs only your transaction ID, which is public. Anyone asking for keys or recovery wordsRecovery words (seed phrase)A list of 12, 15, 18, 21 or 24 words that can restore wallet keys. Anyone who has them can take your bitcoin. is a scam.