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 0x9dffad11edd6fa8ed15668a4da9dd9d39421bc4c1208a802f164307f16e44a16. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9decd1db-6963-4411-a2df-2fda38e7d08a.json and https://artists.proofprofile.net/proofs/artist/9decd1db-6963-4411-a2df-2fda38e7d08a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Noble Patria, Tu Hermosa Bandera (Costa Rica National Anthem)
Somos Libres, Seámoslo Siempre (Peru National Anthem)
Himno Nacional de la República de Colombia (Clombia National Anthem) [Colombia National Anthem]
Orientales, la Patria o la Tumba (Uruguay National Anthem)
An-Naschid asch-Scharif (Marocco National Anthem)
Aash Al Maleek (Saudi Arabia National Anthem)
Pincez tous vos koras, frappez les balafons (Senegal National Anthem)
God Save the Queen (England National Anthem)
Hino Nacional Brasileiro (Brazil National Anthem)
Himno Nacional Argentino (Argentinia National Anthem)
Bilādī Bilādī Bilādī (Egypt National Anthem)
Der er et yndigt land (Denmark National Anthem)
La Brabançonne (Belgium National Anthem)
Himno Nacional Mexicano (Mexico National Anthem)
Mazurek Dąbrowskiego (Poland National Anthem)
Lijepa naša domovino (Croatia National Anthem)
Gimn Rossijskoi Federazii (Russia National Anthem)
Du gamla, Du fria (Sweden National Anthem)
Schweizerpsalm (Switzerland National Anthem)
Advance Australia Fair (Australia National Anthem)
Das Lied der Deutschen (Germany National Anthem)
Arise O Compatriots, Nigeria's Call Obey (Nigeria National Anthem)
Soccer Championship 2018 (32 National Anthems)
Das Lied der Deutschen - Germany National Anthem
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 0x2c88158fb273632a2723ba50e26cf65021e31c1ebd1f18d63da76fc80cd9c751. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/DEZ921800764.
Nad Tatrou Sa Blýska (National Anthem Slovakia)
Hen Wlad Fy Nhadau (National Anthem Wales)
Flower of Scotland (National Anthem Scotland)
Denes Nad Makedonija (National Anthem North Macedonia)
Het Wilhelmus (National Anthem Netherlands)
Schtsche Ne Wmerla Ukrajina (National Anthem Ukraine)
Österreichische Bundeshymne (National Anthem Austria)
Il Canto Degli Italiani (National Anthem Italy)
Kde Domov Můj (National Anthem Czech Republic)
Soccer European Championship 2021 (24 National Anthems)