Joana Marte () is a Brazilian rock band founded in 2015 in Belém, Pará, by vocalist/guitarist Rubens Guilhon and drummer Bruno Azevedo. They consider themselves to be an alternative rock band, but the
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 0x34f55dc085a33a3d67bbfd5e7ad54a06c7062a75077cee576a15bb08e0495c45. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c2f8ef6-07be-4eb8-899d-318bfee46e3b.json and https://artists.proofprofile.net/proofs/artist/9c2f8ef6-07be-4eb8-899d-318bfee46e3b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).