Fluitsma & Van Tijn () is a Dutch writing duo made up of Jochem Fluitsma (born in Amsterdam on 1 June 1958) and Eric van Tijn (born in Amsterdam on 2 November 1956) They won the Golden Harp Dutch mus
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 0xc36e5b70fa0d2e26c2e16888a25f530fd8facfeddd05884374e8b7af67ab3893. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23d2e65c-1007-4447-b671-0a9185a29a68.json and https://artists.proofprofile.net/proofs/artist/23d2e65c-1007-4447-b671-0a9185a29a68.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hollandse Hits - Top 100 (Beste Aller Tijden)
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 0x310a1f0424ef57a829a34727523ff2bac2d28e9bc07776c50eec378143716bb2. 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/NLS241201103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310a1f0424ef57a829a34727523ff2bac2d28e9bc07776c50eec378143716bb2. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/NLS241201103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310a1f0424ef57a829a34727523ff2bac2d28e9bc07776c50eec378143716bb2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLS241201103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310a1f0424ef57a829a34727523ff2bac2d28e9bc07776c50eec378143716bb2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLS241201103.