Other Concepts

BRC-20

BRC-20 is a fungible token standard native to Ordinals, with the name being inspired by Ethereum's ERC-20 token standard. BRC-20 work by the creator inscribing a 'deploy' function and then prospective collectors/traders can mint by inscribing using this function. BRC-20 tokens are created and transferred as JSON data.

CPFP

Acronym for Child Pays for Parent. CPFP is effectively an alternative to Replace by Fee (RBF) and prioritizes an unconfirmed transaction by attaching a higher fee to a subsequent transaction, which is dependent on the unconfirmed one. This incentivizes miners to confirm both transactions. While independent of parent-child provenance of inscriptions, it is a way you can prioritize stuck transactions by making a new transaction with higher fees (child transaction) using the outputs from the previous transaction (parent transaction).

Delegates

In practice, electing a delegate for an inscription is similar to recursively accessing the contents of another inscription and can be used for creating copies/editions for an inscription. Instead of just referencing another one, an inscription that has a delegate inscription set will return the actual content and content type of the delegate. It is also a more cost-effective way compared to recursively referencing another inscription.

PSBT

PSBT stands for Partially Signed Bitcoin Transaction and is a format for Bitcoin transactions that allows multiple parties to work together in creating, signing, and finalizing a transaction. It has a multitude of uses across Bitcoin like for multisigs, but for Ordinals it's also the method by which we can have trustless transactions on marketplaces and elsewhere. As the name might imply, it involves one party signing for part of a Bitcoin transaction and other parties signing for remaining portions to execute the transaction.

RBF

Acronym for Replace By Fee. Similar to CPFP, RBF is a mechanism for prioritizing stuck transaction on Bitcoin by that allowing users to replace an unconfirmed transaction with a new one that has a higher fee. For users coming from Ethereum, this is similar to rebroadcasting a transaction with the same nonce and with a higher fee to expedite its confirmation.

Resinscription

Reinscriptions involve inscribing on a sat that already has at least one inscription one it. This does not overwrite any existing inscriptions; it simply appends a new inscription to that satoshi. These inscriptions become soul-bound to one another on the sat.

Stamps

Stamps are another way of putting data onto the Bitcoin blockchain in a method similar to Ordinals. While Ordinals store data in the witness field of a Bitcoin transaction, Stamps encodes data as base64, break it up into chunks, and directly store it in UTXOs as transaction outputs. While far more constrained in what data can be put on-chain, Stamps are arguably more uncensorable then Ordinals.