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
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51331ed81a6587c0c3f8b1dae8a22beadf34c7899ddaacde0f870df6263eab8a. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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 0xc10cfcaeabbcb24b95c52bbac4f272df94c6ca3d1560bb5974e1733557c843ae. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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 956551 (2026-07-03T21:18:05Z), 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 0x88fc6cda7337807caf532ef6096d94c69391c0f68e255c7123d2aa17357c4d1b. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-17T00:00:23Z), 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 956857 (2026-07-06T01:26:17Z), 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 956857 (2026-07-06T01:26:17Z), 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 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 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 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 958775 (2026-07-19T22:34:20Z), 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/NLD321200106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eaaf85c003dbaee7b9351f821e767d55a7d53b08f845d4cd986b43d611b633c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLD321200108.
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 958711 (2026-07-19T09:26:32Z), 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/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 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 0x37ba48de019fdd4fd24ccd25e060b8b3f5b68df73f87250ab4fadc6b7be530f0. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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 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.