Leo Alkemade (born 6 August 1980) is a Dutch cabaret artist, comedian and actor. He is one of the comedians in the sketch comedy television show Sluipschutters. He played roles in multiple films, incl
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 0x8eb1aab81811bba5ee83d5f0a3b558bd52cc1b5097b9c5c999af9fa2dfca6ae6. 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/1b95aa8b-3c60-48fe-97dc-915c9cdc76ca.json and https://artists.proofprofile.net/proofs/artist/1b95aa8b-3c60-48fe-97dc-915c9cdc76ca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dorp Van Hop En Van Mout - Live in Mariahout
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 0x882aed93e513ed32c7db9cd738b5b6343f9d59d6d9bd75d2443d98f4ee05c5ba. 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/NLP972300025.
Kind Van De Zon En De Wind - Live in Nuenen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7798b67ab319530f73e4fc64b792430ec8cc004da6068877b1dd3874acfcf103. 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/NLP972300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8303f0bec02d71dd200cd5e99505cf6f8db6d79a9a4c3e4c7ab6b1f2dcc2a89. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/NLP972300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07fb5f76e51bb68bfe0f21e3e9ebc090f88ac2e15b75ac18fcb2605ead7baeb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLP972300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07fb5f76e51bb68bfe0f21e3e9ebc090f88ac2e15b75ac18fcb2605ead7baeb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLP972300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb9ca81abb91971db60d7014c0757d73386b6c51b8b72cbef18c8599c2660ee. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLQ7J2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fcbad2b2c9c1f7648b155f9677cbfc35e187071e07a3d8f5262b6c35bfa9d49. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLQ7J2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63ef6ca1f682fc1b874246bb417527abcfbe854ae4005538998919b70d03ce7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLQ7J2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37d3e06d5b779bf9e20f15a00547975cf1361976d05945726f2ca0df179d723. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLQ7J2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80286534cbc27bb7a976d688207b0f5e5a5317bdb24c2ae392a901d1064e3c64. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLQ7J2100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf19a9b31d7c69ebddf6a9e6c233987567570af66258340fc92bead595d949ff. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NLQ7J2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c567fed5a442a2b1c3650a0b59db43e18076ba833808092fc79b8735078ea27. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ7J2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4ed40803c1a2338e89e0095964362ba5b26ce2520bd81a204807dfd4c90eb6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ7J2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff56239233651982041e23a17cab86e6fe65db25dd94b0b0babdde12dcc97177. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ7J2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7196851e868873cded38582cc058afd04eb52a8f89b13d9e0fea33879265ff. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLQ7J2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf882ab590506cbce198673260a3d7f4ad3f59f13f6607bd81779fbecd276346b. 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/NLQ7J2500004.
De Koers Komt Thuis (Buren van de Brandweer Remix)
De Koers Komt Thuis - Buren van de Brandweer Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca851cef8a1bba8944d734f475956d04406228c49f8a9923d6730f5089112637. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL1GQ2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98cc5d02986524e5c008e34be995da673013d9fbb5a92991cfa91cc66a002b09. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLQ7J2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d57f1b33d4dafe4bc0797337121da15045d8a889ebf48becbe292884ccb12a8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ7J2400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b79ae04c9bc0229f188e25fb8787e6aa629655b6635010f8c87399db4dd7e1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ7J2400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317d90dfe9b292eb471cd5c9a98b24a4539e31411e63edcd2adfc0347163144b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLQ7J2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32c2bea422e9ea0e53ce61cde83312a36e1e84d4eb9fc68881f1ac0a47cf98a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ7J2300027.
In Het Wiel - Live (Kleine Komedie 2023)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bce3f96f2b0f811386ce879da2e8e0f9a2755dbe586725670407584de2f05c5. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/NLQ7J2300022.
Van Een Andere Planeet - Live (Kleine Komedie 2023)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6c92c5af413f15dc8145b8e5396a2b2265238d0700ffe1cde28eadfd1b681a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLQ7J2300023.
Feest Voorbij - Live (Kleine Komedie 2023)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0cd40af462aed2782bbb8fe18e7d2e03311eaf7e08dcdc6c7e1379540d7861. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NLQ7J2300024.
Trap 's Door - Live (Kleine Komedie 2023)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6ea2ad9ce6db221692229b311dbad1f6e691530625db7dda65c409b63ddbdc. 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/NLQ7J2300025.
Ploegsteert - Live (Kleine Komedie 2023)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34df4f0ea8266a902096e40859231bb50a0e423c6b1cf61b5e2f660533fc7a5e. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/NLQ7J2300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ed7f44b92b7f30d3f0383f72d3dcbc548c6c4fb0002143c75d1447d5be8315. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ7J2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc462ede004d3d166c02d2728a98384233e0cd4ba848521e069e9ad76bd2f5a0b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ7J2200069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf19a9b31d7c69ebddf6a9e6c233987567570af66258340fc92bead595d949ff. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ7J2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fcbad2b2c9c1f7648b155f9677cbfc35e187071e07a3d8f5262b6c35bfa9d49. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/NLQ7J2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80286534cbc27bb7a976d688207b0f5e5a5317bdb24c2ae392a901d1064e3c64. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLQ7J2100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d527bb1644573aa1b7cfbf1a8a401ff28af6b49c1b1c17a596159ce17761fb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ7J2200010.