Jacques Houdek (born Željko Houdek; 15 April 1981) is a Croatian recording artist who represented Croatia in the Eurovision Song Contest 2017 with the song "My Friend". Houdek began his professional s
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 0x3cbde927fc64cc02a822f209aaf0ce2795c10d55ceae678e861f8cd4359d2578. 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/989c4f88-b205-4074-b48c-da3efdc25ad4.json and https://artists.proofprofile.net/proofs/artist/989c4f88-b205-4074-b48c-da3efdc25ad4.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 0xb00d885e1eb91707fc1a97912dc3540edcfd36e62878fd3f1efcf37c9745a659. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:23:05Z), 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/HRA040544339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2655b52a3ceadfc285a94cacc02b8a98ea1ee6b34d184aa4eb0165addd1756. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/HRA040546257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf536c30f072fc3960dbbbfcfa68f6745ac5bb97c1d27b0e4f02101728ade9f65. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/HRA040546258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea5b9acd259c2d2c3703f293149742b8a89898e66148c7cd9a86482a7292aff. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:06:29Z), 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/HRA040546259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84ae39090d9c1b0a6da8ad47ce735262e146455bb29a58c43aaa83b6d980b0a. 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/HRA040546260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425cfc9b252fb21760c2d07ccc9ec82bbd1f378e8b9bd83a419acaa0fee4d7af. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:05:43Z), 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/HRA040546261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd8c1ab5b76acb067bc5c4866a8715a0c50829af0052aef0a63bbb86d9ec6e0. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/HRA040546262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bff4bf1916ed7208e79bad45a855cfad791c0e9055a90e79743ec7ceb750dd. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/HRA040546264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d85fc85ab736c54690bd837632e8eb78612f9c05951dd71703be1b8134ec282. 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/HRA040546267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da166f4a3dc935330b7266d33f6754c0c9510a789b77ab8fbb7c9910f23f706. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T14:30:53Z), 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/HRA040647696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a789de17b94261c5573085b2282a469d5f7a87fb5910db0fda096e479f4381. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/HRA040859196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3502406f1c73d68e5c177e3c4a799feeaa955b19b08b71ec30bfee7a4ebee684. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T10:43:40Z), 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/HRA040859208.
Za Posebne Trenutke - Best Of Jacques Houdek
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee0d3471e537985332a11f3bd7349c44957357a8cec1b5fcdab3a32f2826b17. 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/HRA040859182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7009b5b4b76065dedd9d277b163d1b2e4acbaf288c468bb76385c1f49b7b362. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:06:23Z), 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/HRA040859185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14b917912e5222d848620dc0b837eec6a51360d7192d24798065157d3e5ec6c. 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/HRA041165677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3db1f3dc80adb8a67be4dea79730a6a6e9f7e43e9d0735db02850421deffd21. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/HRA041266724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096e288fdeb73b9fb19dd0471b747e2bba3c973057473e405ef6cc4cf1883b1a. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/HRA041163697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9197547c56e927e6cf96d05101006b8e4b58be721180ba849f3f035115e5e1. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T17:40:06Z), 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/HRA3J1800036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392d068ecedcdec80ab7662b6b23f4e7f667c3e6e9a908fd5a0c368e9c86faa0. 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/HRA3J1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93d65d63b31727daa479c91029a507daaea2600ddbe5dda0be21ba3c842c300. 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/HRA3J1800029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4eeae71d5a998f7592087b33acabf04c73edd4fbaabc93a09e150f14592a8e. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/HRA3J1800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb519cb30290eb214d3989b821ddb833d215b2f187b05ddffa636068c6c6b446. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/HRA041686118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x883ef4a6fa7daaee38c448f81785ac6e7394e7982fef07236ae9454b61aae30e. 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/HRA3J1800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51ffaa99fe1ecaf64ab4645d71528a43838448f95b3e31709c32ae988f664eb. 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/HRAA42500072.
40 Velikih Hitova: Ljubav Postoji Zbog Nas - Najljepši Dueti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f3607df0518bfdf3f7e725f18d118a0fb904d53701b392ba1579b92feed3e2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/HRA100702384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f697466b34a20ecd628f683440f19089c9c36045331b6c182fc2fe9295a794. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/HRA041266725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2a027604d9a96a4b3bc8193cc06668a09a6d672425b40f8ba3514b2c00b20e. 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/HRA040645157.
Everybody's Gotta Learn Sometime - Mannix Disco Revamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03cb6841c9bfb10369b8a4b61491136573c80edea56beec8e689fbd7b0c9ce6d. 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/ATGV72100096.