Tamana may refer to: Places Tamana, Kiribati, an island Tamana, Kumamoto, a city in Kumamoto Prefecture, Japan Tamana, Wallis and Futuna, a village Tamana, Kyushu, City in Kyushu, Japan Tamana
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 0x8c4f6d5bfc6a3a38a6ff9dd86eef03e2e4f0c5a14f3bb21dbcf12ac3d033acfd. 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/763736ee-635e-4cc4-9488-c1f0a28d4467.json and https://artists.proofprofile.net/proofs/artist/763736ee-635e-4cc4-9488-c1f0a28d4467.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).