Delegation in Bitcoin: Part 3

Getting your Trinity Audio player ready...

This post was first published on Medium. Read Part 2 here.

Previously, we have introduced two ways to delegate the right to spend one’s bitcoin: one at Script level, the other at transaction level.

We generalize the former to delegate to any script/smart contract, instead of a public key only. It allows one to authorize arbitrary smart contract to spend one’s bitcoin.

two hands transfering a thing

The full code is shown below:

Contract DelegateToScript

Line 9 checks the delegated script is signed and thus authorized by the owner. Line 12 and 13 ensure the delegated script goes into the spending transaction’s output as the new locking script using OP_PUSH_TX, similar to the emulation of Pay to Script Hash (P2SH).

Watch: CoinGeek New York presentation, The Path to BitCoin Adoption: How to Turn the Entire Web into Bitcoin Apps

Tagged:

BitcoinsCryptSmart ContractsUTXO

Recommended for you

Kyrgyzstan’s hydro-powered ‘crypto’ mining: A low-cost solution

As miners grapple with post-halving economics and network difficulty, Kyrgyzstan’s low-cost, green energy model could reshape global hash rate distribution.

By Jacob Rozen

July 4, 2025

China pledges retaliation after Taiwan’s chip export ban

After Huawei tricked TSMC into developing two million chips, Taiwan’s government stepped up restrictions on China, which, in turn, has...

By Steve Kaaru

July 3, 2025