Dropped & Replaced is a tx status in MetaMask.
有两种状态：
- Dropped Transaction
- Dropped & Replaced Transaction
Dropped Transaction
定义
由broadcasted状态 –> 变为dropped状态
是Ethereum nodes（也就是矿工）的操作。
A Dropped transaction can be re-broadcasted and re-appear as a Pending transaction (by any Eth node).
Dropped 常见原因
Ethereum nodes dropped it from transaction pool
- Ethereum nodes 指的是 Geth or Parity
- most likely due to lower gas price
Max amount of Pending transactions an Ethereum node reached(this
- depends on settings/limits of the individual clients
Dropped & Replaced Transaction
成立条件
- a newly created transaction with the same FROM account nonce is accepted and confirmed
- previous txhash invalidated
Dropped & Replaced 原因
The earlier tx had low gas price which would take a very long time to confirm,
- a second tx with higher gas price was created to replace it
The Ethereum Node that the wallet/service connected to was not fully synced, and an incorrect nonce was used
User-initiated to replace or cancel a pending transaction