Delegation in Bitcoin: Part 3
Crypt generalizes the "Script level" delegation to delegate to any script/smart contract instead of a public key. This allows users to authorize arbitrary smart contract to spend one's bitcoin.
Articles By Xiaohui Liu:
Emulate any SIGHASH flag without a fork by programming it in a smart contract
sCrypt developed a novel approach to emulate any SIGHASH flag by coding the logic in a smart contract. It requires no protocol change and is more practical than adding a hardcoded flag through a fork.
Graftroot on Bitcoin today: No fork needed
sCrypt demonstrated how to implement Taproot on the original Bitcoin using a contractless contract and shows that its follow-up proposal, Graftroot, can be implemented in a similar fashion.
Contractless contract
sCrypt has developed a technique called "contractless contract" to faithfully execute any smart contract in a regular payment (P2PKH) transaction.
Taproot on Bitcoin: Contractless Contract + MAST
In this article, sCrypt showed how to implement Taproot using the original Bitcoin protocol without any changes, by combining contractless contract and Merklized Alternative Script Tree (MAST).
Zero-overhead private timestamping in Bitcoin
Bitcoin has a lot of potential uses far beyond payments, and each block has a cryptographically secured timestamp which can be particularly useful for time-sensitive data.
Pay to decrypt
sCrypt designed a smart contract called “Pay to Decrypt” that makes the exchange atomic and trustless, ensuring only a correct plaintext can redeem the locked fund.
Elliptic curve arithmetic in Script
sCrypt has implemented elliptic curve arithmetic in Script, where they compute it directly compared to the previous implementation where they conducted the computation off chain.
Delegation in Bitcoin: Part 2
In the second part of this two-part piece, sCrypt introduces a universal yet straightforward delegation mechanism, an alternative to the script-level delegation they have developed.
Delegation in Bitcoin
In this two-part piece, sCrypt demonstrates a novel way to allow users to spend their UTXO/coins without giving another party their private key.
Smart contract-based pyramid scheme on bitcoin
A pyramid scheme is a business model that recruits members via a promise of payments or services for enrolling others into the scheme, rather than supplying investments or sale of products.
Private key puzzles
sCrypt introduces a new type of Bitcoin smart contract called private key puzzles, which can only be solved by providing the corresponding private key of a given public key.