# kaal:claim:3125827-034

**Claim.** Finality in SPoS is measurable because forking away from a given block would cost the community all sem tokens created on the chain after it, and that quantity equals half of all fees sent since the block was produced.

**Type.** mechanism  **Support.** argued

**Holds when.**

- sem minted in proportion to fees on every validated block

**Source quote.**

> the sem that members gain from policing block production is equal to half of all fees sent since the production of the block. In order to fork a chain from that particular block, the community will lose all sem tokens created subsequently

**From.** Craig Calcaterra, Wulf A. Kaal, *Secure Proof of Stake Protocol* (2018), 6 Analysis, page 24

**Cite as.** Craig Calcaterra, Wulf A. Kaal, Secure Proof of Stake Protocol (2018). SSRN: https://ssrn.com/abstract=3125827

**Verify.** sha256 of source PDF `598d9bd95e4af7a0a35328677c6bfc069f69f2e32c30c720b3a0be98a23a40cb` at https://raw.githubusercontent.com/wulfkaal/Academic-Papers/main/papers/pdf/Calcaterra%20and%20Kaal%20-%202018%20-%20Secure%20Proof%20of%20Stake%20Protocol.pdf

**Topics.** consensus-and-security, tokenomics, reputation

**Keywords.** finality, fork-cost, sem-tokens, reputation-weighted-salary, chain-stability

**Canonical form.** This markdown file is the canonical hashed representation of the claim. Its sha256 is the content hash used for attestation.