Leendert "Leen" Huijzer (; born 23 March 1946), better known by his stage name Lee Towers, is a Dutch singer with international success. He remains one of the best-selling Dutch artists, and held the
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 0xb6b7a99bc71d95d4ecba15f6396c4b16dd0a096628985443993e252f4249fa0a. 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/ea297fd6-20ff-4810-8277-7f57915cb913.json and https://artists.proofprofile.net/proofs/artist/ea297fd6-20ff-4810-8277-7f57915cb913.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 0x4ded81a278dd3d07aaa74f2851381ffdd575957b7d42ec56a150cd7c18d20150. 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/NLA201700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43aded619806d9d6ebb12ccce3841e945727fb8a103a572026d891843554a16d. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/NLA200000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5bf8e680415f24f55bf96da6220ec4b351b2263b992cc23015ded9282226a7. 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/NLA200000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02545f7f8901656c9589b3b5f23dc6ca3edfa5259b74e7b187fe376f30f184f1. 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/NLA200000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49fa48bcc2abbe6767afd2ecaea89ebb11b3125400666f582de0f28ad335f332. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/NLA200000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a0e9c77ac791a0c6bc811f767ffbfeb07e36b3b73475716e561ab555790196. 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/NLA200000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ed0e272e0dfced536e28bf0b8618ef3995a5157c994e1f23dbfbff1eaeed9f. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/NLA201100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe90fa034dcefa4b16e6d413e116d5e8301e72b6b38ccc9588abe7c7bcc8e4a7f. 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/NLA201100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da48cb50ce0303ab9626b54e059d3d171c460813962a4a87cbccb58463e1596. 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/NLA201100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e9758f2946de845229e59931252b6bf7cf112dccc7db0fd6b0bb920a3f4d0b. 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/NLA200000022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3332e6348676307bb265b353a5c346455c1e1e11851cb4bde77a416eb4bcece. 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/NLA201100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1213043bfbcaa82dc59080f745c42b9cb3f767a02ac70d57267abb7d210949d4. 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/NLA201100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600c688eb7eb5a923dccdbaeb4df87294b991340a719331fe8ccfa082a7574a1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLA201100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385b9b8f676148c2ca29913f455d99f8a843f9046809c69ab420c4875dd3caba. 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/NLA200000028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec995046c23a824166f417a3c26b137e8ae8b4130b5b34ec88c35a3cd7501a5. 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/NLA201100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa7b61dde202064b09c07b3bbf80ce9ac3013bd5e92cc76149f75619ae961f9. 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/NLA201100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f53d3ba53f7937cb4e854bdcca6a11deeb356b7b23b35bf691297ae559c9ff. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLA201100031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5d8ffa115002f38f62ea732ef965164d689b12d6763d7211965853e3683395. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/NLA200000030.
You'll Never Walk Alone (live at Ahoy Rotterdam)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67bd2462680420cd02755de4b379f3eff503ffa0d107eea7499fc25f30f851d5. 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/NLA201700012.
Ik Wou Dat Ik Voor Één Keer In M'n Leven
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8af17eb51ef04f301d88f623a1131a1ee8169006a414f49025065554f41b6f. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/NLF4H1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73deda51075a901f129ae97ab96db323cf3b13cc5ee68f04ae1c18e6e2b1165b. 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/NLA241802646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5279a2aa4d11fd8b1335b420f46c1c8b1d4e3f401dfab3022c9d0861630d951c. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/NLA241802645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed5d43e86c1a0ecb8c05be4cf23617d7d1546a7603dde4ed265205673d4b49f. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/NLA209900023.
You'll never walk alone (WK 2014 Party Edition)
You`ll never walk alone (WK 2014 Party Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59cbae2e87918a9c7c78df747e4babdd2d2736beebabd71e6f37c62349ef951. 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/NLA241802660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d40991e38ae3a7e07dfe171d0b3035779228ed7a0389fea2d30a29846bce090. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/NLSU31800027.
You’ll never walk alone (DJ Maurice remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43edcec53e44027b56c0444a4fe2f524e7431446cb33b305f9da3fe7ac122b0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA209900025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba7a9e9a934494241e9814f2e98cb25c41dd59a81e60836abf2a631b3d680d1. 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/NLA201800212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8330d832696ec0c3fa57d5901613eca29b2b5ac9c0035190f1477b4fe228837. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLS200000003.
Beste Zangers Seizoen 11 (Aflevering 8 - Duetten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20fd3e55c9b0796378db38ea8a0e6e46cc7a1baf5f03e2ea9d1da005611583d6. 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/NLSU31800044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff986e465010d1512c8932ff4b817ac7e557a7c54b593f60883f5e1e57db773. 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/NLSU31800048.
Beste Zangers Seizoen 11 (Aflevering 5 - Hoofdartiest Glen Faria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084446d559a0b5392c1e686e60ae06f1f5ede7bec1cd80699cee3646eef3bf64. 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/NLSU31800031.