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 0xa231902325b0744e476697a3497c03f16637e2cfd7b586aaa3f84e7702d92d5e. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b933fce-f2ac-41d4-9fb7-1a63b7533f4d.json and https://artists.proofprofile.net/proofs/artist/9b933fce-f2ac-41d4-9fb7-1a63b7533f4d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
PONS Hörkrimi Spanisch: De repente, un grito en la noche [Mörderische Kurzkrimis zum Spanischlernen (A1-A2)]
PONS Hörkrimi Spanisch: La puerta negra [Mörderische Kurzkrimis zum Spanischlernen (B1-B2)]