Toma or TOMA may refer to: Places Toma, Burkina Faso, a town in Nayala province Toma Department, a department in Nayala province Toma, Banwa, Burkina Faso, a town Tōma, Hokkaidō, Japan, a town Tōma S
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 0x8e3de99ac6a04649eec4a64474f7deb4bf2af2a3f5a93f4aeee15790a0ee25d0. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ec8560e-d803-4159-8c33-9e0a5c65fc8a.json and https://artists.proofprofile.net/proofs/artist/6ec8560e-d803-4159-8c33-9e0a5c65fc8a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).