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OP_CAT

Tech

Gavin Lucas

4 September, 2024

OP_CAT enables any contract in Bitcoin

In a Silicon Valley seminar, sCrypt's Xiaohui Liu talked about Bitcoin contracts and how the opcode "OP-CAT" is fundamental to...

Efficient multi-input transaction grinding for OP_CAT Bitcoin covenants

Finance

Xiaohui Liu

3 September, 2024

Efficient multi-input transaction grinding for OP_CAT Bitcoin covenants

sCrypt previously implemented Bitcoin covenants using OP_CAT, based on this Schnorr trick, which they say can greatly simplify signature calculation...

Bitcoin OP_CAT use cases series #4: Recursive covenants

Tech

Xiaohui Liu

8 July, 2024

Bitcoin OP_CAT use cases series #4: Recursive covenants

A recursive covenant applies to the immediate transaction and subsequent transactions that spend the bitcoins, meaning the imposed conditions could...

Bitcoin OP_CAT use cases series #3: Vaults

Tech

Xiaohui Liu

2 July, 2024

Bitcoin OP_CAT use cases series #3: Vaults

Following our series #1 and #2, sCrypt demonstrates how to construct non-custodial vaults to provide enhanced security for stored bitcoins.

Bitcoin OP_CAT Use Cases Series #2: Merkle Trees

Tech

Xiaohui Liu

25 June, 2024

Bitcoin OP_CAT Use Cases Series #2: Merkle Trees

In this article, sCrypt enumerates the numerous applications for Merkle trees and how the OP_CAT opcode can be utilized to...

Trustless Ordinal sales using OP_CAT-enabled covenants on Bitcoin

Tech

Xiaohui Liu

28 May, 2024

Trustless Ordinal sales using OP_CAT-enabled covenants on Bitcoin

In this piece, sCrypt demonstrates a trustless sale of an Ordinal NFT using a layer-1 covenant made possible by re-enabling...

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Steve Kaaru

29 Oct 2025

OP_CAT

OP_CAT enables any contract in Bitcoin

Efficient multi-input transaction grinding for OP_CAT Bitcoin covenants

Bitcoin OP_CAT use cases series #4: Recursive covenants

Bitcoin OP_CAT use cases series #3: Vaults

Bitcoin OP_CAT Use Cases Series #2: Merkle Trees

Trustless Ordinal sales using OP_CAT-enabled covenants on Bitcoin

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