Pound for pound is a ranking used in combat sports, such as boxing, wrestling, or mixed martial arts, adjusted to compensate for weight class. As fighters in different weight classes do not compete di
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1725853e53c5fcf225ecfe71d320acd0faef572805ec4846e584535eeb11879. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/03be8870-97ae-405e-9b14-da1d218860d7.json and https://artists.proofprofile.net/proofs/artist/03be8870-97ae-405e-9b14-da1d218860d7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.