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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a41c6aef07775fbcafbfdd618bf9ad251f64a7c691efa140ee399847f72bff. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe0ea90f-898e-4e91-8744-70f3fa3d84e8.json and https://artists.proofprofile.net/proofs/artist/fe0ea90f-898e-4e91-8744-70f3fa3d84e8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Malte & Mezzo: Keine Nöte mit der Zauberflöte (Die Klassikentdecker)
Malte & Mezzo: Gruselige Bilder einer Ausstellung (Die Klassikentdecker)
Malte & Mezzo: Eine Party mit Beethoven (Die Klassikentdecker)
Malte & Mezzo: Auf Tour mit Mozart (Die Klassikentdecker)
Malte & Mezzo: Der Karneval der Tiere (Die Klassikentdecker)
Malte & Mezzo: Der Feuervogel (Die Klassikentdecker)
Malte & Mezzo: An Bord mit Schumann (Die Klassikentdecker)
Malte & Mezzo: Der Weihnachtstraum (Die Klassikentdecker)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e622239aad586bef800386bb041797c931bf3da8ed11be3b74ca27e8603fec2. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382203001.