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Une ordre de marché est l'un des types d'ordres les plus simples et les plus utilisés en trading. Il permet à un trader d'acheter ou de vendre un actif immédiatement au meilleur prix disponible sur le marché. En raison de sa rapidité et de sa facilité d'utilisation, il est généralement le premier type d'ordre que les débutants rencontrent lorsqu'ils négocient des cryptomonnaies, des actions ou le forex.
Toutefois, les ordres de marché privilégient la vitesse d'exécution plutôt que la certitude du prix. Comprendre comment ils fonctionnent — et quand ils doivent être évités — est essentiel pour réduire les coûts de trading inutiles.

En trading, le prix ne bouge presque jamais au hasard. Il suit des modèles, des directions et une impulsion. L'un des outils les plus simples mais les plus puissants pour identifier cette direction est la ligne de tendance.
Une ligne de tendance n'est pas un outil de prévision. C'est un outil structurel. Les traders qui l'utilisent de manière incorrecte s'embrouillent. Ceux qui la comprennent obtiennent une clarté.
Qu'est-ce qu'une ligne de tendance ?
Une ligne de tendance est une ligne droite tracée sur un graphique de prix pour relier des points clés du prix et mettre en évidence la direction générale du marché.
Il existe deux types principaux :
Ligne de tendance : Tracée en reliant les plus bas croissants

Bitcoin is intentionally conservative by design, but that hasn’t stopped developers from pushing its boundaries. One of the newer experiments in this space is Bitcoin Stamps—a protocol that allows digital art and other data to be embedded permanently into the Bitcoin blockchain.
Inspired by earlier innovations like Ordinals, Bitcoin Stamps take a different technical approach, one that prioritizes immutability and long-term data preservation. Understanding how they work helps clarify why they stand apart and why they’ve sparked debate within the Bitcoin community.
Understanding Bitcoin Stamps
Bitcoin Stamps are digital artifacts created through the Bitcoin STAMPS protocol. Their defining characteristic is permanence. Once stamped, the data is designed to remain part of the Bitcoin blockchain indefinitely.
What makes this possible is where the data is stored. Instead of using transaction witness data, Bitcoin Stamps embed information directly into unspent transaction outputs (UTXOs). Since UTXOs are core to Bitcoin’s accounting model, data stored this way becomes part of the blockchain’s persistent state and cannot be easily pruned or discarded.
How Bitcoin Stamps Are Created
The process begins by converting a digital file—such as an image—into a base64-encoded string. This encoded data is then included in a Bitcoin transaction and marked with a specific STAMP: prefix.
Rather than storing all the data in a single output, the protocol distributes it across multiple outputs using multi-signature transactions. Once the transaction is confirmed, the data becomes inseparable from Bitcoin’s transaction history.
Each Bitcoin Stamp is assigned a unique identifier based on the order of its transaction. To qualify as a valid Stamp, the transaction must be the first to include a correctly formatted STAMP:base64 inscription, ensuring uniqueness and preventing duplication.
The Bitcoin STAMPS Protocol
Bitcoin Stamps are built on two closely related standards that define how data and tokens are handled.
SRC-20 is based on the open Counterparty protocol. It allows arbitrary data to be embedded in spendable transaction outputs rather than witness data. This design choice is critical, as it prevents pruning and ensures long-term data persistence.
SRC-721 focuses on non-fungible assets. It enables more complex NFTs by breaking images into layers and optimizing storage using techniques such as indexed color palettes. These layers can later be reconstructed into a complete image, allowing higher-quality artwork without excessive on-chain data usage.
Bitcoin Stamps vs. Bitcoin Ordinals
While both Bitcoin Stamps and Ordinals allow data inscriptions on Bitcoin, they differ fundamentally in design.
Ordinals store data in the witness portion of transactions. This approach is efficient but comes with a trade-off: witness data can be pruned by nodes over time. Bitcoin Stamps avoid this risk by embedding data directly into UTXOs, making the content effectively permanent.
There are also differences in flexibility and cost. Bitcoin Stamps support variable image sizes, starting from roughly 24×24 pixels and scaling upward. Larger images require more data, which increases transaction fees. Ordinals, constrained by block size limits, offer more predictable costs but less flexibility.
From a security standpoint, Bitcoin Stamps rely on multi-signature transaction structures, while Ordinals typically use single-signature transactions. This adds an additional layer of robustness to stamped data.
Why Bitcoin Stamps Matter
Bitcoin Stamps represent a philosophical shift in how Bitcoin can be used without altering its base-layer rules. They demonstrate that permanent digital artifacts can exist on Bitcoin with strong guarantees of immutability and censorship resistance.
At the same time, they revive ongoing debates about block space efficiency and network bloat. Embedding large amounts of data directly into UTXOs is powerful, but it also raises concerns about long-term scalability and resource usage.
Final Thoughts
Bitcoin Stamps offer a unique approach to embedding digital art and data on the Bitcoin blockchain, emphasizing permanence and long-term integrity. By storing data in UTXOs and using multi-signature transactions, they differ significantly from Ordinals in both technical design and underlying philosophy.
Whether Bitcoin Stamps become a lasting standard or remain a niche experiment, they reinforce one key idea: innovation on Bitcoin is not slowing down—it is simply evolving within the network’s carefully constrained framework.
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