José Carlos Barbosa Calvário (1951, Porto – 17 June 2009, Oeiras) was a Portuguese songwriter and conductor. He was also a composer, and conducted at many Portuguese festivals.Obituary In the Eurov
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 0x256949ccd8103ee664f3424a916af8614a50628851df2e8df72eb7dbf60b56f4. 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/e8b67b2d-be08-4155-aff8-3f00a0d40968.json and https://artists.proofprofile.net/proofs/artist/e8b67b2d-be08-4155-aff8-3f00a0d40968.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
25 DE ABRIL (Através de dois clássicos revisitados)