Mark Leon Medlock (born 9 July 1978) is a German singer and the winner of the season 4 of Deutschland sucht den Superstar (DSDS), the German version of Pop Idol. Early life Medlock is the elder of tw
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0x6650fb84fcad0e2ccdcecd1450c54737342a5c0bc4168f6cd2cb7dd280068792. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/557c028c-86ec-4abb-8b2f-dd51ab1c9ef8.json and https://artists.proofprofile.net/proofs/artist/557c028c-86ec-4abb-8b2f-dd51ab1c9ef8.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 → block OTSBitcoinBlock must exist at that height 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 0xfd6357996f9de3c7622ccee21966c64b53370c3cb04d190de833f54d6f472096. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/DEE860700361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c5dd283d148c291e990c7019a6cbb076b28bbe0f6977bf806e4108295913b5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEE860700362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a4ff9bdfcec416e8118127b62adff651447febeec99c21cdd08e1a971fdace. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-20T00:26:41Z), 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/DEE860700308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8c7ff7e4cb5113248ebcd009ab80fb82c972f89a725899afd788f69ddbce1d. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/DEE860700653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039589b9ed63651571ccca47d3b8def65e8c7a819fa709cb68b07e3488b3b10a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEE860700443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39be47271256f2ef0e093415f96d8ed1afce767d3934db8f0ac4883c971968a0. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/DEE860701182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2bc0b4169d7619ac5483373767cde906d16968d61ec1e2f7d42c1f2634efb6. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DEE860701184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98e7d6d7d388a2f8582f08bb7d65f042a2f1d2d3bae979b725b695904acfaca. 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/DEE860701186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b022e33bd42342663811710d4735ffdef5806e00959f6f96abbceca8f850c09. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/DEE860701194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b38ecf711a398092ea4e68b5d29973efb12803adbd26fba5cd00e86b9cfd02. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEE860800263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9283d1b39a678d2eb8ccd2ad572832064caaa436d2241fe0223409493c3f15a3. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEE860900356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985d8dc1471232ce34f5ddfec127cf1066e078db9d4f5eff706e1a60c2a07d16. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/DEE860900403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb583ba2b32ebaa0136c362d094ae968bc60f5be9e970d984b009a0c5dc3994f0. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/DEE860900402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734b40adb2e8a8f14cc15118022d7514ab39432d99c225d12875b932400d4633. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEE861000252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c5bb0abbc528cd68aedc05ee0a16cb333eb377a6b78be9a2587cb3ebd74a00b. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T17:32:10Z), 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/DEE861000412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039589b9ed63651571ccca47d3b8def65e8c7a819fa709cb68b07e3488b3b10a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/DEE860700443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a4ff9bdfcec416e8118127b62adff651447febeec99c21cdd08e1a971fdace. 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/DEE860700308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b38ecf711a398092ea4e68b5d29973efb12803adbd26fba5cd00e86b9cfd02. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/DEE860800263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7173ebba5e51ebd4ec030dcdaf88ed29c76c6b92f2bc7f40b304c7d9c7372a. 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/DEE860900958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93545564cb7cd4198b1f4f3a4bb030790884990d47f16c9c353eacaa9bddbabb. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/DEE860900354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985d8dc1471232ce34f5ddfec127cf1066e078db9d4f5eff706e1a60c2a07d16. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEE860900403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841916f7fb387963d2928d9ecdd4e7a174275a5dd046eccab09d805b4817d089. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/DEE860901153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e513744506808b0a189a9bba5e0440b1acdf75dc8e178743f1682835c76341a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DEE861000966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734b40adb2e8a8f14cc15118022d7514ab39432d99c225d12875b932400d4633. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/DEE861000252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b4649ddefae9e4884298c1a21ecc36ef6acaa7654a9e3277e40c9db1b168df4. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/DEE860701137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6357996f9de3c7622ccee21966c64b53370c3cb04d190de833f54d6f472096. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEE860700361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61764caac2c9b7778948e96c48635ce471ba3ff2ce093e58dec44e2b927dad1. 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/DEE861101322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93545564cb7cd4198b1f4f3a4bb030790884990d47f16c9c353eacaa9bddbabb. 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/DEE860900354.