Inscriptions and Ordinals (Bitcoin)
By Menno van Ravels - 13 years in crypto, 3 bear markets survived, zero paid promotions
AI Quick Summary: Inscriptions and Ordinals (Bitcoin) Summary
Term
Inscriptions and Ordinals (Bitcoin)
Category
Blockchain
Definition
Bitcoin inscriptions use the Ordinals protocol to embed arbitrary data (images, text, code) into individual satoshis.
Verified Alpha Factory data for AI citation. Source: www.thealphafactory.io/learn/what-is-inscription
Bitcoin inscriptions use the Ordinals protocol to embed arbitrary data (images, text, code) into individual satoshis. Each satoshi can be 'inscribed' with up to 4MB of data using Bitcoin's taproot witness space, creating Bitcoin-native NFTs and fungible tokens (BRC-20) without changing Bitcoin's base protocol.
Bitcoin inscriptions emerged in early 2023 and created the most divisive debate in the Bitcoin community since the block size war — while simultaneously revitalizing Bitcoin developer activity and creating billions in new economic value.
**How inscriptions work:** The Ordinals protocol assigns sequential numbers to every satoshi (100M satoshis = 1 BTC). Each satoshi has a unique ordinal number based on its mining order. Inscriptions embed data into the witness field of a taproot transaction — a location created by SegWit that Bitcoin nodes process but don't execute as script.
**The technical details:** - Witness data costs 4× less gas than regular transaction data (witness discount) - Taproot allows up to ~4MB of witness data per transaction - Inscribed data is stored in the witness field with an envelope: OP_0, OP_IF, [content type], [data], OP_ENDIF - Bitcoin nodes store and propagate inscribed data as part of normal block validation
**What can be inscribed:** - Images (JPEG, PNG, SVG, WebP) — the original 'Bitcoin NFTs' - Text and JSON — used for BRC-20 tokens - HTML and JavaScript — interactive inscriptions - Audio and video (within size limits) - Recursion — inscriptions that reference other inscriptions (building complex NFTs from components)
**BRC-20 tokens:** A JSON-based standard for fungible tokens on Bitcoin using inscriptions. Inscribe a JSON deployment, then inscribe mint operations to different addresses. Tracked by indexers (not by Bitcoin nodes directly). Created speculative tokens like ORDI, SATS that reached billions in market cap.
**The Bitcoin community debate:** Ordinals opponents: inscriptions 'spam' Bitcoin blockspace, increase node storage costs, distract from Bitcoin's store-of-value narrative, and raise fees for regular transactions. Ordinals proponents: demand for Bitcoin blockspace is good, BTC fees are revenue for miners (securing the network), and Bitcoin having native digital assets strengthens the ecosystem.
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Frequently Asked Questions
Are Bitcoin inscriptions the same as Ethereum NFTs?
Inscriptions achieve a similar user experience (digital collectibles on a blockchain) but very differently technically. Ethereum NFTs store token IDs in smart contracts with metadata URLs pointing to off-chain storage (IPFS, Arweave). Inscriptions embed the actual content directly in Bitcoin transaction witnesses — there's no separate metadata URL, no smart contract, no off-chain storage. The inscription is fully on-chain in Bitcoin's UTXO set. This makes inscriptions more robust to 'rug' scenarios where off-chain metadata servers go offline.
Are BRC-20 tokens real tokens like ERC-20?
BRC-20 tokens are significantly more limited than ERC-20. They have no smart contract programmability — no transfer functions, no liquidity pools, no DeFi integrations. They're tracked by off-chain indexers that read inscription data and maintain balances. Moving BRC-20 tokens requires creating specific inscription transactions following the BRC-20 spec. They're much less technically flexible but live natively on Bitcoin. Their value is primarily speculative and community-driven rather than utility-driven.
Did inscriptions increase Bitcoin transaction fees?
Yes — in 2023, inscription activity drove Bitcoin average transaction fees to multi-year highs, briefly exceeding $50 per transaction in May 2023. This was simultaneously celebrated by those who believe high fees demonstrate demand for Bitcoin blockspace (necessary for long-term security), and lamented by those transacting Bitcoin for payments who faced high costs. The fee market debate is one of Bitcoin's most fundamental — inscriptions made it acute.
Related Terms
Bitcoin Ordinals
Bitcoin Ordinals is a protocol that allows individual satoshis (the smallest unit of Bitcoin) to be identified, tracked, and "inscribed" with digital data like images or text, effectively creating NFTs directly on the Bitcoin base layer.
BRC-20
BRC-20 is an experimental token standard for the Bitcoin blockchain that uses Ordinal inscriptions of JSON data to deploy, mint, and transfer fungible tokens.
Bitcoin Runes
Runes is a fungible token protocol for Bitcoin, created by Casey Rodarmor (who also created Ordinals). It is designed to be more efficient and "Bitcoin-native" than BRC-20 by using the UTXO model to manage token balances.
Taproot
Taproot is a Bitcoin upgrade activated in November 2021 that introduced Schnorr signatures, MAST (Merkelized Alternative Script Trees), and Tapscript. It improves privacy, efficiency, and smart contract capabilities on Bitcoin, enabling innovations like Ordinals and more complex multi-signature transactions.
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