Submit new isomorphic transactions (rbf_btc_tx + rgbpp_ckb_tx_virtual) to RGB++ CKB Transaction Queue

[Flouse]

Discussion

Let's say BTC TX_1 has an isomophic rgbpp_ckb_tx_virtual. And there is a job of TX_1 in the assets-api's RGB++ CKB transaction Queue, called TX_1's job.

How to automatically add TX_2's job to the RGB++ CKB transaction Queue when TX_1 is replaced by TX_2?

1. Monitor Bitcoin Mempool, and detect TX_1 Replacement
   Continuously monitor the Bitcoin mempool for any new transactions that spend one of the inputs of TX_1.
   When a new transaction (TX_2) spending inputs from TX_1 is detected, identify if TX_2 is a replacement for TX_1 based on criteria like higher fee rate, same inputs, etc.

• Is there a better replacement detection algorithm?

  Maybe these APIs can help:

  • GET Mempool RBF Transactions: https://mempool.space/testnet/docs/api/rest#get-mempool-rbf
  • GET Mempool Full RBF Transactions: https://mempool.space/testnet/docs/api/rest#get-mempool-fullrbf
  • GET Transaction RBF History: https://mempool.space/testnet/docs/api/rest#get-transaction-rbf-history

2. Verify TX_2 Validity
   Verify that TX_2 is a valid RGB++ transaction by checking if it contains the right RGB++ commitment.

3. Add TX_2's Job to Queue
   Add a new job for TX_2 to the RGB++ CKB transaction Queue, including the TX_2_txid and the related rgbpp_ckb_tx_virtual, a.k.a TX_1's rgbpp_ckb_tx_virtual.

Why this feature is required?

Sometimes the RBF BTC transaction is submitted by other BTC RBF service providers, not through rgbpp-sdk. in this case, the TX_2's job may not be processed.

This process ensures that when TX_1 is replaced by TX_2 on the Bitcoin network, the RGB++ CKB transaction Queue is automatically updated with the new job for TX_2, allowing for seamless processing of the BTC RBF workflow.

Priority: Low

Originally posted by @Flouse in #82 (comment)

References

• feat(btc): support full RBF #150 (comment)
• BTC Replace by Fee (RBF) feature: Allow a BTC transaction to be replaced with a higher fee #82