Mark Frederik Sixma (; born 23 February 1983) is a Dutch trance and house music producer and DJ. In his career, Sixma has worked on collaborations with Armin van Buuren, Faruk Sabanci and W&W, among o
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 0x30a949bdae7b13376248cf7cef4e988f472e856d196583fc8095782f0a19b910. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56d019e3-33fe-4bee-a3d6-523b763e0d21.json and https://artists.proofprofile.net/proofs/artist/56d019e3-33fe-4bee-a3d6-523b763e0d21.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 0x3505933146bcd2cc0927cf11f61a2b7e84369c83be83a437b0e45c8baf0f455d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLF711607300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c76ece3fe16d2e7b09084b7a6b807f8189cc38627f06fe70aeef37bdb9ab387. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLF712004661.
The Best Of Armin Only (Live from the Johan Cruijff ArenA - Amsterdam, The Netherlands) [Highlights]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9825930c2d52da765b66da8f8b7036289263a543306b3191a33e5316383862f4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLF711909181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3ebc755ec09dc42b37235a0054af4a7fa52b3ee8bc4ffcbe1a42d054321383. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLF712009560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343c79df9b5895270ede0ef54a4744c34fd42876a05b4873d7ce9cba59d4cbf5. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/NLF711909184.
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 0xf8c85555b355454934170425cc4e2f61dc8cbbf91ee73e8262ee9bbeb3c0062e. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/NLF711909204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc5a367e435a463ff98dfef622d4b356bc8095c3b40b555be1caa49e933aa24. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/NLF712101561.
Don't Leave Me Now - Mark Sixma Extended Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47320de7e8f3c53fbb44f13d63d2914d905897c5356022d8930142bd42c92e63. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLF712101562.
Adagio For Strings (Mix Cut) - Original Mix
A State Of Trance Year Mix 2014 (Mixed by Armin van Buuren)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49c38c2a8187d736e5d462bbdd5ec8519c516d6ea9d9a813e9563d860022e0f. 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/NLF711406234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd4d3d153fdc63a145d6ea09ec2bbe3752a8cfc6aedfecea817ea5467b0d984. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/NLF711406252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa487d521516664b3264441834b16e579a2f12154f555e644e66ca7d458ddc86c. 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/NLQ8D2201169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4439d4798e4429c392931831ba4e1bb320732953a2d0a4235a0eaa5e67975c. 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/NLF711406216.
Missing (ASOT 874) - Jorn van Deynhoven Remix
A State Of Trance Episode 874 (+XXL Guest Mix: ALPHA 9)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e96b616776740518af8d1368f82a4bca92068a7f32f5a0ffdbaad7de15d3db. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLF711808945.