Sean Na Na is the guitar pop project of Sean Tillmann (who also performs as Har Mar Superstar). The project started as a solo outlet for Tillmann's songs that did not quite fit with his noise band Cal
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b38e35d025eb4e67bb4e5b0ea1abc3b7d6afc54c9149853f14c4a4e6452cf93. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f9e870cc-2f0a-48fd-ac75-bfad0cf6ccbc.json and https://artists.proofprofile.net/proofs/artist/f9e870cc-2f0a-48fd-ac75-bfad0cf6ccbc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).