# bare multisig

URL: https://blockspace.wiki/glossary/bare-multisig/

A data channel in which a 1-of-3 multisig output's first two "public keys" are data dressed as 33-byte keys, and the third is usually the sender's real key. Each fake key leaves 31 usable bytes, 62 per output. The data-types reference lists it as the carrier of classic Counterparty, classic Stamps and SRC-20, and Omni Class B. A 114-byte output carrying 62 data bytes costs about 1.84 raw bytes per data byte, and the outputs stay in the UTXO set until spent.

The output shape alone cannot tell fake keys from real ones; the reference confirms a carrier by decrypting it (ARC4) and testing for the `stamp:` or `CNTRPRTY` prefix, then attributes the full output serialization.

Sources:

- block.space docs: data types · https://block.space/docs/datatypes

Updated: 2026-10-20