Background

Core Chain’s methodology for integrating bitcoin staking centers on CLTV timelock, a Bitcoin-native cryptographic feature that locks up the outputs of a transaction for a pre-defined period of time, during which they can’t be spent.

Transaction Structure

Staking transaction

A BTC staking transaction should have two/three outputs, which are

• P2SH/P2WSH type output, with time-lock enabled redeem script
• OP_RETURN type output, with Core chain staking information
• (Optional) Change address

There is no restrictions on inputs.

Withdrawal transaction

When the time-lock ends, the locked UTXO can be spent using the redeem script