The Ouroboros Protocol - Bitcoin Improvement Proposal (draft)

ricard · July 14, 2026, 3:54pm

Hello everyone,

I am seeking peer review and technical feedback on a Draft BIP I’ve been working on, tentatively named “The Ouroboros Protocol”, for perpetual security.

Solves the problem of abandoned UTXOs, long-term security, dust, 2106 hard fork, and technology obsolescense.

Why explore this path?

While the fee-market transition is the current plan, a strictly fee-dependent model introduces well-documented risks regarding chain stability, erratic hashrate, and fee sniping. Furthermore, relying on voluntary mechanisms like “State Rent” fails to clean up permanently lost coins or dust, leaving full nodes bearing the RAM cost of dead data forever. Finally, forcing active UTXO renewal naturally drains the “quantum honey-pot” of early-era P2PK outputs.

You can read the full Draft BIP on my GitHub repository here:

github.com/bip-proposer/bitcoin-infinity

ouroboros.md

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# BIP: The Ouroboros Protocol (Perpetual Security via UTXO Recycling)

## Abstract

This BIP proposes a consensus rule update to implement a strict circular economy within the Bitcoin network, keeping the 21 million maximum supply limit permanently intact.

An expiration limit is introduced for Unspent Transaction Outputs (UTXOs). UTXOs that exceed a maximum age threshold of `MAX_UTXO_AGE` (e.g., 2^20 = 1,048,576 blocks, \~20 years | 2029) will be deemed invalid for spending and pruned from the nodes' active Chainstate database. The nominal value of these expired satoshis will not be injected into immediate block rewards. Instead, they will be reintroduced into the pending emission reserve, dynamically extending the duration of halving epochs to guarantee a perpetual block subsidy without adding inflation.

## Motivation

The proposal solves four critical long-term problems in Bitcoin's architecture:

1. **Long-term Security Budget:** As the block subsidy approaches zero, network security will rely entirely on the fee market. If fees are insufficient, the hashrate will drop, compromising the network. Proposed alternative solutions like "tail emission" violate the immutable social contract of the 21 million BTC cap.

2. **Chainstate Bloat & Unspendable Dust:** Full nodes must keep the entire UTXO set in RAM to validate transactions. Millions of permanently lost bitcoins (destroyed private keys) and economically unspendable "dust" (UTXOs with a value lower than the fee required to move them) generate "zombie" UTXOs that permanently penalize node hardware requirements, threatening decentralization.

3. **Permanent Capital Loss:** A significant percentage of the total Bitcoin supply is permanently inaccessible. This dead capital provides no liquidity or security to the network.

4. **Quantum Vulnerability:** Millions of dormant early-era Bitcoins rely on outdated cryptographic standards (like P2PK, where the public key is already exposed). These act as a permanent honey-pot for future quantum computers capable of breaking ECDSA.

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I look forward to your technical critiques and finding out where this mechanism might break or how it could be improved. Thank you for your time.