	US 12,219,072 B2
	Methods for grinding-resistant consensus in a proof-of-space-based blockchain
Bram Cohen, San Francisco, CA (US); Krzysztof Pietrzak, Vienna (AT); and Mariano Sorgente, Tokyo (JP)
Assigned to Chia Network Inc., San Francisco, CA (US)
Filed by Chia Network Inc., San Francisco, CA (US)
Filed on Jan. 26, 2024, as Appl. No. 18/424,651.
Application 18/424,651 is a continuation of application No. 17/497,699, filed on Oct. 8, 2021, granted, now 11,924,355.
Claims priority of provisional application 63/150,573, filed on Feb. 17, 2021.
Claims priority of provisional application 63/089,492, filed on Oct. 8, 2020.
Prior Publication US 2024/0250829 A1, Jul. 25, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 9/32 (2006.01); H04L 9/00 (2022.01)

CPC H04L 9/3247 (2013.01) [H04L 9/3236 (2013.01); H04L 9/3271 (2013.01); H04L 9/50 (2022.05)]

20 Claims

1. A method comprising, at a node in a distributed network:

during a first slot in a series of slots of a blockchain comprising a challenge chain and a reward chain:

initiating a challenge verifiable delay function for the challenge chain based on a first slot challenge associated with the first slot;

initiating a reward verifiable delay function for the reward chain based on the first slot challenge; and

during a first signage point interval in the first slot:

broadcasting a first challenge chain signage point in response to executing a first quantity of iterations of the challenge chain verifiable delay function; and

broadcasting a first reward chain signage point in response to executing a second quantity of iterations of the reward chain verifiable delay function;

receiving, from the distributed network, a first block comprising:

a first proof-of-space based on the first slot challenge and the first challenge chain signage point; and

the first reward chain signage point; and

infusing the first block into the reward chain.