La Dolorosa (The Holy Virgin of the Sorrows) is a zarzuela by the Spanish composer José Serrano. La Dolorosa was premiered at the Teatro Apolo in Valencia on 23 May 1930 with a text by J.J. Lorente. B
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 0xd36f270bcb89424d817f89f7de15dfc84eded2fa3415f52001c010b953b93ff0. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0954662-d64d-4ee8-a916-78a3233b4648.json and https://artists.proofprofile.net/proofs/artist/e0954662-d64d-4ee8-a916-78a3233b4648.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).