Please Help! Unconfirmed BTC TX

[Pmalek]

I think the only way to know if a tx was accelerated by a mining pool is if the transaction was added in one of the blocks mined by the pool the tx was submitted to, but in ViaBTC's paid acceleration service, your tx can be accelerated by either ViaBTC pool or one of their cooperating pools, and i would like to think that it is the same for other paid tx accelerating pools. Surely op accelerated this tx, because fee rate in the mempool hasn't dropped as low as the fee rate they attached to their tx.

I also think it was accelerated and probably with the service that Mempool.space provides. The fee rate was too low for a free ViaBTC acceleration and OP already confirmed he didn't have the money to pay for the paid service. He was also on the waiting list on Mempool.space, but we don't know how all that ended.

ViaBTC has its own pool, just like you mentioned. Plus, submitted transactions to them can also be accelerated via partner pools. Mempool.space doesn't have its own pool, at least not under that name. That's why I wanted to know more about how the service works exactly and what OP paid for and to whom.

[nc50lc]

Technically, can we know that a transaction is supported by tx accelerator or not and by what tool?
I searched and could not find anything to check this information.

One indicator would be the block where it's included.
If the pool or solo miner uses a publicly known address that they own or put an OP_RETURN output where there's info about the miner,
then if that pool offers accelerator service, that may be a faint clue that it was accelerated.

In OP's case, the transaction was mined in F2Pool's block and F2Pool has their own accelerator service.

What we don't know is if mempool.space is working with them to implement their own accelerator service.
But I've created my own test account in mempool.space within the same timeframe as OP and it's still in "waiting list" as of now.