Pending payments are a common UX problem for LN that users often complain about. While the cause of this problem is not easily unraveled, there have been several issues involving stuck intermediate nodes awaiting revocation and recipients who can’t give timely preimage replies.
Fabrice Drouin proposed a change to address the issue using a faster
“proceed/try another route” answer using a probe with a short timeout requirement.
The system sends the blank
probe request prior to sending the actual payment,
via the same route.
One of the main features intended for Bitcoin in the future is a native support for multisig payments and coinjoins, they are currently supported by the Blockchain but not in a native way and as such they do not have as much efficiency and privacy as desired. This is going to be the main focus of the next major update in Bitcoin, changing the signature scheme to Schnorr Signatures.
As a simplified alternative to Pay-to-Endpoint (P2EP - Pay-to-Endpoint), developer Ryan Havar proposed a BIP for a new coinjoins protocol that does not need changes to the current Bitcoin consensus and provides a simple, practical way to make coinjoin transactions that are indistinguishable from normal ones.
On of the pros of Bitcoin since its birth is that it’s a public ledger, anyone is allowed to send and receive payments and data on the Blockchain. However, Bitcoin’s network does not provide a way of encrypting communication between nodes, which allows manipulation of data, mass surveillance and analysis of its users.
Although encrypted communication is currently a possibility with VPNs, TOR or other mechanisms, it is not easy for the average user to setup such a connection. There is BIP draft called BIP151 that aims to add encrypted communication to Bitcoin’s network and which currently seems implemented only by Armory.
This is summary for a submission by Ruben Somsen on bitcoin-dev on censorship resistant transactions.
Bitcoin transactions with light client wallets involve addition of transaction fees as incentive for miners to include the transaction to the blockchain through the process of mining. This creates a win-win situation.
First, without any specific conditions, miners get paid the fees provided the transaction gets included in a valid chain with the most proof-of-work.
Secondly, the user enjoys the benefit of his transaction being added to the blockchain. The fees also ensure the security of transaction on the network as miners cannot ignore the transactions or other miners will process it because it has a reward attached.
For the full node Bitcoin Core however, conditions for adding transactions to the blockchain are more specific, one of which is that transactions can only be added to a block with a block height that is one higher than the last.
When Bitcoin was created privacy was not in mind, Bitcoin is a public blockchain and it was created that way. Addresses, balances and transactions are public for anyone to search and track, while that provides transparency, it also lacks privacy.
As a result this lack of privacy can be used by blockchain analysis tools. They work on the principle that in most transactions with more than one input, all of these input addresses belong to the same entity, which can be traced back to its source IP.
This allows companies and governments to track an entity from one address and accurately guess its transactions and holdings in other addresses.
A group at Blockstream recently worked on a new type of transaction aiming at invalidating this principle, Pay to End Point aims at allowing both the sender and the receiver to sign inputs in the transaction, ensuring enough of these transactions exist on the blockchain will invalidate this principle and boost privacy for all Bitcoin users.