Marc-Marie Huijbregts (born 21 December 1964) is a Dutch comedian, actor and television presenter. He is known for his cabaret shows and as co-host of the television show De Wereld Draait Door. He is
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 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 0x739fb808796ea45fabe146df441cda9e2ee801bd43b8234d02b6976696b2bb69. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ea71235-d410-428d-aee6-5b5172cdac08.json and https://artists.proofprofile.net/proofs/artist/3ea71235-d410-428d-aee6-5b5172cdac08.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 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 0x51331ed81a6587c0c3f8b1dae8a22beadf34c7899ddaacde0f870df6263eab8a. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/NLD321000439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608b67f77822bce05045fbd9b6832706daf80bf29c9f3b72c78acfba40789ce7. 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/NLD321000441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb8e5288643743696f83f1d272be5600794c745db90dfbbf7e228cfb1b81008. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/NLD321000442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10cfcaeabbcb24b95c52bbac4f272df94c6ca3d1560bb5974e1733557c843ae. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLD321000443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44651eeb92c7b3d3003a91cb025da40f6b8499541f5af7d88dcd20a4acb55071. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLD321000444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e59c1f72dd11ee3cacf6be62c79ecb1a41b98cfffc044be7c5c80d3abdcb5b9. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NLD321000445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88fc6cda7337807caf532ef6096d94c69391c0f68e255c7123d2aa17357c4d1b. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/NLD321000446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b0607cbbeee87afd2eecdb629dfc7947174d5f046dab1fb131d27f87ae3e5f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLD321000449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac7f8a55251943db9bbe62a5e5c79d472387226320d14fa7086e88397ccbce7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLD321000451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81f69eabe9acd2b77fa554c4c9ffd94dffb8ce805f4c8fd02a1e7a30f3d29f7. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/NLD321000453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f116728f16c4a69c96524c4ec7af68d00a20c2abedfcd33e45bc04ac7158a5. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/NLD321000455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe4ce74822c3bb2c6a905d8916f309abd5a3bdd7af881dc7d224368765550d7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLD321000456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1baa059bc51fdb809558dd1309f1e6700116f4d8d3f840bbcffb45846433f368. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/NLD321200099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe67856cd130f673950df2f2a8c969f2be28778564e53c291b820ee63d06b1b6. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/NLD321200100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5c3eefc570b1dd7d7c79b5755d311911a5db9aa291e296928013464905562e. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NLD321200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ad9f8cbc74365745a44f058d40e52cd8a917b7a4f5e9d9751283773d6ba342. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/NLD321200103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed8f801915b0aedc67c550c4350fc7f31a34b7a1ae7818a510e1a03231cb953. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/NLD321200105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687b7838614fc6e1c13614f0078caee2057b97124e97fa00d201bf6ba20504c2. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/NLD321200106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eaaf85c003dbaee7b9351f821e767d55a7d53b08f845d4cd986b43d611b633c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLD321200108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x355d193530b92cfe37e1f0653552354c5791a7384fc72a4af32679ba04a3932c. 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/NLD321200109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802d58310ab1da354a95c23ca117b24842d42bc064319ef9e6063c4180e8d52c. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/NLD321200110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8654d3a0b3545bdb512bbbabcb945c2c88b9e83fb95bd78e1a828a419571fcbe. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/NLD321200111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa534468fc55589463cb5f3c9845030df4c56fc2f808598c9dd1a90258009fb08. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLD321200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73920cdf986c75120e06730be4e9e0bf13084f5ecb643466e835653e55de506. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/NLD321200113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a91b5d5b08a7423a4990948901b402320b974ff8d67abaadd505ae83fb1507. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/NLD321200114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ae0f8bbd38bb2c76f156288cd2071c60d10e83fa354ce08694aee8e977c042. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/NLD321200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ba48de019fdd4fd24ccd25e060b8b3f5b68df73f87250ab4fadc6b7be530f0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLD321200117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ef20cbe8aee869fb9199e3c7ce89d186ab236387ded2017b6451e333568240. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/NLD321200118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc463ca2db829505d1dfd2c3522a77a153aa8813cbf9209b9df5147992e73b28. 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/NLD450600014.