Which blockchain is best for timestamping?

For evidentiary purposes the choice matters far less than people assume — what matters is that the chain is public, append-only and likely to persist, and Bitcoin and Ethereum both qualify. The meaningful differences are how the hash is stored, whether you need to keep an inclusion proof, and how easily a non-technical person can verify the result.

Why do some services use Ethereum instead of Bitcoin?

Because Ethereum transactions can carry a larger data payload, which allows the hash to be written directly into a transaction and read back as text on a block explorer. Bitcoin's smaller OP_RETURN payload and higher relative cost push most services toward Merkle batching, which means the proof lives in a file you have to keep.

Does the choice of chain affect legal weight?

Not materially. Courts that have accepted blockchain evidence have focused on whether the record is reproducible and whether it predates the dispute, not on which chain was used. What helps is a record a non-expert can verify — which is a design question rather than a chain question.

Ethereum vs Bitcoin for Timestamping

People choosing a timestamping service often start by asking which blockchain it uses, expecting the answer to be decisive. For evidentiary purposes it mostly is not — and the things that actually differ are not the ones usually compared.

What matters cryptographically: almost nothing

A timestamp needs a ledger that is public, append-only, and likely to persist. Bitcoin and Ethereum both qualify comfortably. Both have deep history, wide independent verification, and no realistic path to being quietly rewritten.

If a service is anchoring to one of the two, the choice of chain is not what should decide your purchase.

What actually differs

How the hash is stored. This matters more than the chain.

Bitcoin timestamping typically uses OP_RETURN, which holds a small payload, combined with Merkle batching so many hashes share one output. Ethereum lets you write arbitrary data into a transaction's input field, which is large enough to hold a readable payload directly.

That difference drives everything downstream. A batched record needs an inclusion proof; a direct write does not. See Merkle tree timestamping explained for how batching works and what it costs you.

Cost and block time. Bitcoin blocks arrive roughly every ten minutes; Ethereum blocks in seconds. Fees vary on both. Neither difference matters for a record you will use years later, but it does change how a service prices.

Readability. An Ethereum transaction with UTF-8 text in its input data can be read on a block explorer by anyone who can click "View as UTF-8". A Bitcoin OP_RETURN containing a raw hash, or a Merkle root, requires more explanation.

	Bitcoin	Ethereum
Suitable for timestamping	Yes	Yes
Typical storage	`OP_RETURN`, usually batched	Transaction input data, often direct
Payload size	Small	Larger
Block time	~10 minutes	Seconds
Needs an inclusion proof	Usually	Usually not
Human-readable on an explorer	Rarely	Yes, if written as text
Recognition outside crypto	Highest	High

The one genuine argument for Bitcoin

Name recognition. Bitcoin is the chain a non-technical audience has heard of, and "it is recorded on the Bitcoin blockchain" needs no explanation. In front of a court or an insurer that is a small but real advantage.

Against that, batching is nearly universal on Bitcoin because of the cost, so the record you actually hold is usually a proof file rather than something you can point at.

The one genuine argument for Ethereum

You can put the payload in the transaction and read it back without tooling.

That is why we use it. Your payload hash goes into the input data of a dedicated transaction as UTF-8 text. Open the transaction on Etherscan, choose "View as UTF-8", and it is there — no proof file, no client, no cooperation from anyone. If this company disappeared, every certificate would still verify.

It costs more per record. One transaction per certificate sets a price floor that batched services do not have, which is exactly why they can charge cents and we cannot. That is the trade, stated plainly.

What to ask instead of "which chain"

Better questions, roughly in order of usefulness:

Does my file get uploaded? It should not. Only the hash is ever needed.
What must I keep, and what happens if I lose it?
Can someone verify this without the vendor's software or website?
Is there a step I have to remember later?
Can a non-technical person follow the verification?

Every one of those distinguishes services more sharply than the chain does. A well-designed Bitcoin service beats a badly designed Ethereum one comfortably.

For belt and braces

Nothing prevents recording the same hash on two chains, and for something genuinely valuable that is a reasonable hedge. They are independent records, and neither interferes with the other.