thumb|François van Campenhout François van Campenhout (5 February 1779 – 24 April 1848) was a Belgian opera singer, conductor and composer. He composed the music for the Belgian national anthem, "La 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 0xfea8ca380ee570f518601aa9649b01f7d7c4d106bebfc8da5567dc461cab890b. 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/e5cc4012-15cf-4280-a1a7-6c243b8c020b.json and https://artists.proofprofile.net/proofs/artist/e5cc4012-15cf-4280-a1a7-6c243b8c020b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Francois Van Campenhout: La Brabançonne (National Anthem of Belgium)
National Anthems Of The Eu Countries In The Original Languages
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5559185604f217db84003f58058015c3a8ac4c61b067084dedb6e348eb2010. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FINDE9900086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903d1d9015a164d1a91ae506f979fdc900513335737d879a691c753aa9ac4007. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBAVQ1000160.
National Anthems of Member States of the European Union
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046fbc9066fee1d805c3918ac908335c679bee80e31f3ea7e4ac716e2e9f4eba. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/CZD940900008.
Belgium [La Brabanconne (The Song of Brabant), "Noble Belgium, for ever a dear land…"]
Hymnen Europas - Die Nationalhymnen der 25 EU-Mitgliedsstaaten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f8ff4e6c2310f8bdb1bcdbf490e43bc31a07d7ee673b46cf79db36be18800b. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/HKI190507139.
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
"La Brabançonne", National Anthem of the Kingdom of Belgium
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d04809fdf5d257ea7ca2a6f1bbb65acc2b147fc9b226a6e7e119ec70ceffbd. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLA509705440.
La Brabançonne (National Anthem of Belgium)
Karajan - The European Anthem & National Anthems
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2de42a8df8192b9b0936a2ab32dd6d2e70f74e92f5ee4acdd34ec8971993c3a. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/DEF057204120.