Toba may refer to: Languages Toba Sur language, spoken in South America Batak Toba, spoken in Indonesia People Toba people, indigenous peoples of the Gran Chaco in South America Toba Batak peopl
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 0x5c04fc91e91e69b0277df72ab22a88c4f678a19d637c178c6444f78ab86c5391. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f67a23b9-ae69-44dd-9a94-9998f29c1de1.json and https://artists.proofprofile.net/proofs/artist/f67a23b9-ae69-44dd-9a94-9998f29c1de1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).