Amiti Uttarwar amitiuttarwar

## rebroadcast filters
Reducing noise in the rebroadcast set:

I think there are two ways these filters reduce the rebroadcast set

1. Caching min fee rate by itself —> mempool is emptying out, blocks are being mined & txn fees are decreasing. Time to rebroadcast, set is calculated & cache is applied.

Time 1: caching job runs, top block computed to include a, b, c
Mempool looks like: j i h g f e d | c b a

Time 2-4: txns come in

## backup_dotfiles.md

      
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                amitiuttarwar
                / backup_dotfiles.md
            
            
              Created
              November 25, 2019 19:56
            
              
                Managing dotfiles with work-trees. 
              
          
      View backup_dotfiles.md
  
      
    Idea: make $HOME the git work-tree, with a bare repo in a dummy folder (.dotfiles).
The git commands use .dotfiles as the git directory, and $HOME as the work directory.
Setup

create "bare" repository


don't contain working tree aka copy of source files
store git revision history in root folder of repo instead of .git subfolder

mkdir $HOME/.dotfiles 
git init --bare $HOME/.dotfiles


## transaction_rebroadcasting.md

      
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                amitiuttarwar
                / transaction_rebroadcasting.md
            
            
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              January 6, 2020 20:16
            
          
      View transaction_rebroadcasting.md
  
      
    Background: Currently, a node will only rebroadcast a transaction if it is the originating wallet. This is awful for privacy.
PR #16698 reworks the rebroadcast logic to significantly improve privacy.
Overview of changes

Instead of the wallet directly relaying transactions to peers, the wallet will submit unconfirmed txns to the node, and the node will apply logic to trigger txn rebroadcasts.
The node will apply rebroadcast conditions to all transactions.
The wallet will attempt to resubmit unconfirmed transactions to the node on a scheduled timer. This is only useful if the txn is dropped from the local mempool before it gets mined.
The mempool tracks locally submitted transactions (wallet & rpc) to ensure they are succesfully rebroadcast. Success is defined as receiving a GETDATA for the txn.


## transaction rebroadcasting
I propose reworking the rebroadcast logic to
	1. Significantly improve privacy
	2. Create a cleaner divide between wallet & node responsibilities

#### Conceptual changes
	* Instead of the wallet directly relaying transactions to peers , the wallet will submit unconfirmed txns to the node, and the node will apply logic to trigger txn rebroadcasts.
	* The node will not keep track of “my” transactions but instead apply rebroadcast conditions to _all_ transactions.
	* The wallet will attempt to resubmit unconfirmed transactions to the node on a scheduled timer. This is to ensure the txn is not dropped from the local mempool.
New rebroadcast conditions:
	* relies on `BlockAssembler::addPackageTxs` to identify top block of transactions based on current mempool. I’ll call this “top transactions”.
	Reducing noise in the rebroadcast set:

	I think there are two ways these filters reduce the rebroadcast set

	1. Caching min fee rate by itself —> mempool is emptying out, blocks are being mined & txn fees are decreasing. Time to rebroadcast, set is calculated & cache is applied.

	Time 1: caching job runs, top block computed to include a, b, c
	Mempool looks like: j i h g f e d \| c b a

	Time 2-4: txns come in
	I propose reworking the rebroadcast logic to
	1. Significantly improve privacy
	2. Create a cleaner divide between wallet & node responsibilities

	#### Conceptual changes
	* Instead of the wallet directly relaying transactions to peers , the wallet will submit unconfirmed txns to the node, and the node will apply logic to trigger txn rebroadcasts.
	* The node will not keep track of “my” transactions but instead apply rebroadcast conditions to _all_ transactions.
	* The wallet will attempt to resubmit unconfirmed transactions to the node on a scheduled timer. This is to ensure the txn is not dropped from the local mempool.
	New rebroadcast conditions:
	* relies on `BlockAssembler::addPackageTxs` to identify top block of transactions based on current mempool. I’ll call this “top transactions”.