Ad Vanderveen (born Arend van der Veen; September 21, 1956, in Hilversum, Netherlands) is a Dutch songwriter, guitarist and singer who is active in the roots/Americana genres. Early life (1956–1980)
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 0xd052d4221940df04ec667a9597aed79b3095e83f3be1bc9c8bf017ce0620a583. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f39c107-6923-436e-94ae-32cc753aea09.json and https://artists.proofprofile.net/proofs/artist/8f39c107-6923-436e-94ae-32cc753aea09.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Presents of the Past / Requests Revisited
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 0x5159ff5d72440255b8c6c27ad2dfeeda1a646815a5ac8ac1b31ae4c9272ebe28. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T15:07:14Z), 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/NLCIZ2500164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11fd6643ea6e8866eb374eeb6d918ca89f0f7b4e9a8019ad6fa79fb6c1c8cb0b. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/NLCIZ2500168.