Bitcoin full nodes require increasing computer resources that are not available to most of the public, therefore most users tend to use SPV. Simplified Payment Verification is a way for users to check the validity of a block without downloading the whole blockchain, only needing a copy of the block headers of the longest chain.

This schema makes SPV clients vulnerable to forks as it is secure under the assumption that the longest chain is valid and as attacks like Segwit2x have shown and this is not always a safe assumption. A new schema has been proposed on the Bitcoin-dev mailing list that allows invalid blocks to be rejected as long as there are enough honest miners to create a block within a reasonable time frame. The new schema doesn’t fully protect clients against dishonest miners but is an improvement over the current SPV.

Blockstream has just introduced Liquid Core, a multiplatform desktop wallet for transacting Liquid Bitcoin.

Users can deposit to supporting exchanges and withdraw as well as engage in peer-to-peer transactions. In addition, transactions are significantly faster (settled in two minutes) and users enjoy a default confidential transaction setting that hides sensitive transaction details such as transaction asset and amount from third parties.

Anyone familiar with wallets can use the Liquid Core wallet although Bitcoin Core users will find it much easier to navigate. Requirements and instructions on how to use the wallet are available on the website. See more details to get started.

The team at BTC Pay Server published an article introducing their Payment Requests feature.

It allows you to get paid in cryptocurrency just by sharing a simple URL using a new type of time-sensitive inoice page built into BTCPay.

BTCPay Server is an open-source cross platform, self-hosted bitcoin server compatible with Bitpay API.

Proof-of-reserve transactions are transactions provided by a certain custodian to prove ownership for an amount of funds. For example, lets say an Exchange currently holds 30 thousand Bitcoins on behalf of its users, if anything happens to the exchange, say a hack, the exchange might need to prove to its customers that their Bitcoin is in safe hands, currently any company that wants to perform a proof-of-reserve must do it in its own way and accordingly, their users have to understand the construction to be able to verify it, this makes the process not very common among custodian companies as it’s both tiresome and would require educating their users on technical terms.

A new BIP was proposed as a way to formalize a standard format for constructing these proofs, making it easier for custodians and users with existing wallet infrastructures to understand these proofs. Proofs are formatted as a regular Bitcoin transaction with small differences. This transaction must be unspendable as its sole purpose is to demonstrate the availability of the funds, not spending them. The proof must be linked to the issuer, preventing custodians from just copying other custodians’ proofs.