An open standard anyone can verify
BSV Layered Multicast is published as open BRC specifications — the same documents 1BSV is built on. Open standards are both a trust signal and a moat: no black box, no vendor lock-in, independently verifiable.
BRCs (Bitcoin Request for Comments) are the public specifications for the BSV ecosystem. The BSV Layered Multicast suite below defines every layer — from the shape of a single frame to how blocks are distributed and how loss is repaired. 1BSV is a commercial network built on the open-source implementation and design of these standards. Read them, implement them, check our work.
Foundations
Frame formats
- BRC-124 Multicast transaction frame format
- BRC-128 Multicast extended transaction frame format
- BRC-130 Multicast transaction frame fragmentation
Addressing & sharding
- BRC-129 IPv6 multicast group address assignments
- BRC-139 Multicast shard manifest announcement protocol
Loss repair
- BRC-126 Multicast transaction NACK retransmission protocol
Hierarchical Distribution
- BRC-131 Multicast block announcement frame format
- BRC-135 Multicast block header frame format
- BRC-133 Multicast coinbase transaction frame format
- BRC-134 Multicast anchor transaction frame format
- BRC-127 Multicast subtree group announcement frame format
- BRC-132 Multicast subtree data frame format
Read and build
The full BRC repository and the open componentry behind 1BSV are public.