Big mama () is a Chinese language neologism for an Internet censor on web bulletin board systems in the People's Republic of China. Big mamas are human censors and moderators on different online plat
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 0x93dfcc8fa16f57a12bc47b7e4d2ff61ce028fc81734eb61a115140f028f235b8. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b1c36da-4701-4602-9f89-025c0880e5d3.json and https://artists.proofprofile.net/proofs/artist/0b1c36da-4701-4602-9f89-025c0880e5d3.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.