Letterstick Band are a band from north-east Arnhem Land in Australia. The members are from the An-Barra Clan on the coast near Maningrida. They are named after the wooden tools on which messages are c
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 0xe4e9f0fdcd0fa945c3d8edf5594eef1768832b57f05ac7cacb0babd7bb41e6a8. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b066353-be1e-4f41-8646-842b050a3c1d.json and https://artists.proofprofile.net/proofs/artist/3b066353-be1e-4f41-8646-842b050a3c1d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).