Bitcoin block header
A Bitcoin block header is a fixed-format data structure containing summary information about a block in the Bitcoin blockchain.
How big is it?
80 B of data
Serialized header size · specified
A little perspective
About 1.25 times the encoded signature size of Ed25519 digital signature.
Ed25519 digital signature: An Ed25519 digital signature is a cryptographic value used to verify the authenticity and integrity of digital messages or documents.
Measurements, assumptions & sources +
Bitcoin block header
The serialized Bitcoin block header is defined as 80 bytes. This excludes transactions, network framing and any display encoding.
Defined examples — our methodology
The marked serialized header size is calibrated. Unmeasured illustration details are representative.
Ed25519 digital signature
An Ed25519 signature is defined as 64 bytes. This counts the signature value only, excluding the message, public key, protocol framing and text encodings such as hexadecimal or Base64.
Defined examples — our methodology
The marked encoded signature size is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 80 B
For comparison, this page uses serialized header size. The record labels this value specified, so the stated convention rather than an inferred average controls the comparison.
The serialized Bitcoin block header is defined as 80 bytes. This excludes transactions, network framing and any display encoding.
The identifying illustration and the numerical comparison remain separate. How calibrated comparisons work →
Recorded properties
Bitcoin block header dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 80 B | Not recorded | specified |
Around this scale
Go smaller. Go bigger.
These links use compatible data records, ordered around the selected value.
Nearest lower value · DigitalEd25519 digital signature64 BAn Ed25519 digital signature is a cryptographic value used to verify the authenticity and integrity of digital messages or documents.Around the same scale · DigitalGPS navigation message subframe37.5 BA GPS navigation message subframe is a segment of digital data transmitted by GPS satellites to provide positioning and timing information to receivers.Nearest higher value · DigitalMaximum standard Ethernet frame1.518 kBThe maximum standard Ethernet frame is the largest unit of data that can be transmitted in a single, untagged Ethernet packet, excluding certain protocol overheads.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
There’s always another scale
Follow your curiosity.
DigitalEd25519 digital signature64 BAn Ed25519 digital signature is a cryptographic value used to verify the authenticity and integrity of digital messages or documents.DigitalSHA-256 digest32 BA SHA-256 digest is a unique digital fingerprint generated from input data using the SHA-256 cryptographic hash algorithm.DigitalGPS navigation message subframe37.5 BA GPS navigation message subframe is a segment of digital data transmitted by GPS satellites to provide positioning and timing information to receivers.DigitalIPv6 address16 BAn IPv6 address is a numerical label used to identify devices on a computer network using the Internet Protocol version 6.DigitalUniversally unique identifier16 BA universally unique identifier is a standardised alphanumeric code used to distinguish information or objects in computer systems.
DigitalText page3 kBA digital file containing one page of plain text characters without formatting or embedded fonts.
DigitalASCII character1 BAn ASCII character is a letter, digit, punctuation mark or control code encoded using the American Standard Code for Information Interchange.DigitalEthernet MAC address6 BAn Ethernet MAC address is a unique identifier assigned to network interfaces for communications on physical networks.