Bart Claessen (; born 22 January 1980) is a Dutch electronic dance DJ. He is best known for the trance songs "On the Move" and "Infected" from 2001 under the name Barthezz, which reached numbers 18 an
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 0x746d60b4eee7fcd2b2f582ba849e30fc8e13f8a3fc023c364b96f7b2df502966. 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/ff8bf6ca-6873-415a-86c0-7918c050a3fa.json and https://artists.proofprofile.net/proofs/artist/ff8bf6ca-6873-415a-86c0-7918c050a3fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xf8838960aed4dc42aa94ce3d8af4cb9fb54c79cd9f32c942012dcea1f0e5e286. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/NLF710903393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3ef917c8a14e03015077d3076bc2c24420e0c4aad29089cd04205a687e6377. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T16:23:37Z), 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/GBEWA1000091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d18759fb06fa902f6c8cc8d154aa2bd5543a81bd6186cc5e7543bce7bf248b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NLQ881000628.
We.Are (Markus Schulz In Search of Sunrise Remix)
25 Years Of Anjuna Mixed By Bart Claessen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc04a80ef7720faa635b1ba1a64404f069d43232366206d65de4aea6ae6e5b27. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GBEWA2503920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303258b65b27917c34ac601eda508b00a611173f1320640bf87827142e7aae74. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/GBEWA2503922.
Aria Epica - Bart Claessen Remix (Mixed)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923be37faadbac741eb81db753dd2b2d77a99b810098adb4dd8e4dc2a134d662. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBEWA2503924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f06687e3a4d316021d16d013dd123c3df8a8160dbb7be62cf97419c7da85790. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBEWA2503925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66da2dc29079d5ed4ea11bdec0de117e548ad7956074bf75d102ffb475f33b9. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:46:34Z), 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/GBEWA2503926.
From The Earth - Breakfast Remix (Mixed)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d57d12b4ef0b6db54a8371366bd7d3f7cd8c19481a948e3bb529d0df5c23b1. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T11:20:24Z), 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/GBEWA2503928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963c67885833d11d719e4d45f1bb9bca3c1b70d2a3cac0e966717bfe5f9a7918. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GBEWA2503929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda58abaf344f7e09772c7baabb7729857a278f8649797cf52f1a672ae476fb83. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T04:42:40Z), 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/GBEWA2503930.
ALPHA 9 Presents: 20 Years Of Anjunabeats
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b18ff4a58268fa085a023bd0a3b8c4d33d34643df70a11b698d797f4d551c4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBEWA2100300.
Razorfish - Bart Claessen 2007 Rework (Mixed)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1176d25459aa55a3f16fb4404e7036022acb62f65f96a34a41d29b65067a12. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBEWA2100302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2613103074930f65bb5038f92865118871f42e34386e4864affbd40ac9d50875. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLCY30800028.
Cold Front - Bart Claessen Remix (Mixed)
Andrew Bayer Presents: 20 Years Of Anjunabeats
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34820aec1161a1d303cd9fbe9d4f651a959bd6592d2db427397139d793b77b59. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBEWA1910108.
Elf (Flashback) [ABGT531] - 2001 Returning Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5205df8b2b97eb168368d5a2fd7b74ff2d4c29bb250757425d2d8aba66874298. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBEWA2302733.
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
Helsinki Scorchin' - Bart Claessen Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f10dd35e9aa7d6b42d73d63216c8be78b8049202d43bdc380970797ca2768d. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBKQU1210312.
A State Of Trance Episode 229 (Year Mix 2005)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9290b026cf4284bcdbafb813160c0c64935897abc407028c3d36d29da1b95b86. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLF711313702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e37b9730fe3816b49aba446f53425f171037a315a2e2c4ab620f421a04c157. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBEWA1910114.
Razorfish - Bart Claessen 2007 Rework (Edit)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd77b2347bd49bc6d01e5ea6cb5cd96158f4b7fce44ef33ea333961502e83c2f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBEWA2100311.
Razorfish - Bart Claessen 2007 Extended Rework
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d3a9c9c3c1051619344fa13f02406d83a173a5931c194e388a34c4be619519. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/GBEWA0801001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e49a36d0469b123486e1ebc4ebb8d7b4991f0f48de15fe9d0533dfe79a4ebb. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBEWA1910110.