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Glossary
Entropy source

Entropy source

One of the three independent public systems Truestamp captures unpredictable randomness from, the NIST Randomness Beacon, the Stellar ledger, and the Bitcoin blockchain, each yielding entropy observations with its own proof bundle type code (30 NIST, 31 Stellar, 32 Bitcoin).

Overview

An entropy source is one of the three independent public systems Truestamp captures unpredictable randomness from: the NIST Randomness Beacon, the Stellar ledger, and the Bitcoin blockchain. Each source has its own capture mechanism (HTTP polling for NIST pulses, a server-sent-event stream for Stellar ledgers, a WebSocket stream for Bitcoin blocks) and can be enabled or disabled independently, so a problem at one source never blocks the others. Every captured value becomes an entropy observation folded into a block’s Merkle tree, and a proof of that observation carries a source-specific top-level type code in the proof bundle format: 30 for NIST, 31 for Stellar, 32 for Bitcoin. See entropy sources for what each source publishes and why these three were chosen.

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