Luka Ivanović (; born 18 May 1992), known professionally as Luke Black (), is a Serbian singer and songwriter. Born in Čačak, he became the first Serbian artist to be signed under Universal Music Grou
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 0xcb74c71dd2b1a07c9bb2712420a048c1c495a8b25e25e2de7b2edc8615f6551b. 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/fc8de871-fad4-4c1a-bc78-ecbd233d24d6.json and https://artists.proofprofile.net/proofs/artist/fc8de871-fad4-4c1a-bc78-ecbd233d24d6.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 0x6565c7bcf1b4bf9ae82146ef877533363f09e617d999ab5f463c74a63bc9a583. 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/CA5KR1971328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b13e9e001b3fe2e77c2b730c08767c53d716fe6c6028b7bca878541ba12164. 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/RUB421901499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c55e3a274bf7264f5dc219d57476fc870eacc872bd8e5a6055d88c5984345ed. 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/QZNWU2266227.
Eurovision Song Contest Liverpool 2023 (Karaoke Version)
Who The Hell Is Edgar? - Eurovision 2023 - Austria / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6558c38d5f11c19fcaa268035c92abb819bddbb455cd585c633e9d6357148669. 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/DK2DY2300074.
Because Of You - Eurovision 2023 - Belgium / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14559756610f06eccfb98a0d06d568cb1e67a05d940e5e8fd91a38eb84318da. 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/DK2DY2300041.
Watergun - Eurovision 2023 - Switzerland / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696be1473ee8275c038479b3be09d65f9abf6e115ce968861a10f41888fd351c. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:35:05Z), 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/DK2DY2300071.
Break a Broken Heart - Eurovision 2023 - Cyprus / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaaf38ff4f251375ba2ccd6d9f0576a2e3c0b8dce17352b900a81da6c4d01e25. 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/DK2DY2300043.
Cha Cha Cha - Eurovision 2023 - Finland / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3baaeba029ce6fd88e59bcfd26241315b4f2e1f97e5cee98af24e135bc6714d3. 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/DK2DY2300048.
Évidemment - Eurovision 2023 - France / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b32fd00332c5086eee57c7535b3cdf57dbec15a1db7e2a62eb88db3dc768cde. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DK2DY2300075.
Unicorn - Eurovision 2023 - Israel / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261f502f4e56be24a745eb30b4989e186fcc3a06df28efb3d33690f880db0f2d. 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/DK2DY2300070.
Soarele și Luna - Eurovision 2023 - Moldova / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4055b27ead3a546cd2482c03986dc490638bf4cd5f21ce5bd1250a05b36c34e3. 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/DK2DY2300065.
Burning Daylight - Eurovision 2023 - Netherlands / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe032f572a3f4eef3324064d4e2144c43cb5fee2ca234727b783041b6b9d3daf. 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/DK2DY2300046.
Queen of Kings - Eurovision 2023 - Norway / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1b5c25e4c72b24c5a64020e7d7dd7b25c3f6b3ca2a0ef93424c1eaf5a602f6. 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/DK2DY2300063.
Solo - Eurovision 2023 - Poland / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb936d2ecf87e9760f037ab547410904ac6ee93152bf79066f3c3544e7ab21dc1. 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/DK2DY2300066.
Tattoo - Eurovision 2023 - Sweden / Karaoke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e89e391b76885569f109829b316a34f76deb0ae2e36d13556349f095684613. 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/DK2DY2300068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cacb9149ae386917c555a556d4d728afd2c32d230c385278d84e41a0ca90a2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE5752434613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2fb3e88e686d0116dfb5950c666f176228c66e6ced83b600348e17639bfaf8. 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/SE5752434614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40558ed52a9084a95d5304842d9e4b70992ea243d4c31346ecb2c3dd36ce2448. 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/SE5752434615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf081c5aee311d043ef6ca0f6bc79fb8ea8cc146b00aa67cdbf5e7b1c37aaf614. 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/SE5752434616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5687d7ee6e56bb26f45e931eccf07823b3bd02e8aa21c072bbbbfec6c88a87. 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/SE5752434617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b049d03ca94d1e608461a9a4cdf06f2a60a6b96ff3dbad5e807ec49aaf0651. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE5752434618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384ff0433da8dc20bb831d4716563602c3040f63f27b3393b5ccdb65c8a07a6b. 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/SE5752434619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0bb21ca70a72a282ed3b7ef0b5cd4b1cbd0ab8433637f85db1187f7f5931f6. 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/SE5752434620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c1e11350b7a2740494ff6bf8ff38c5cdc4961c911e5a4e9016dcee6263fb69. 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/ATUM71600112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6884e8f7f0c3c257ea8b78f5f42cc4cc7326ef4a653d88a045bb4258b4f028. 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/SE5BU2528793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421964a4edea5255be70eacd1ee85dc5d5379b439ffa141f1b57f7633b97320b. 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/SE6SA2493532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164442b40da0013b06712f20e230393a5bb9977bda3751fc1aaf974df5b17693. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE6SA2428334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf081c5aee311d043ef6ca0f6bc79fb8ea8cc146b00aa67cdbf5e7b1c37aaf614. 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/SE5752434616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8bef21948c27756bba313fc828454d10bd79ae183a04cd62b33486c4de4a22. 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/QM7282314998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94123d0ba40e1c097651487bea517f8bbbc87b637c3d51f686bd00c845e4f1fd. 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/RSA042300092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbbf2ce3856f813b7865addbee191ef8717c907f8456ba53fcf38364a4037ada. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:58:59Z), 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/QM4TW2338322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96d6507e68cbd8f3328d4b611ddab9c7d5fc47a8cdee17a3410acc5c14b35a9. 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/GBKPL1976682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e98a397adecc234cc6a1b1fbdd0b5a61d701f65058cf91324fa9314a50ec582. 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/USUM71405886.