Marko Kutlić (born 18 May 1995) is a Croatian singer. Music career 1995–2013: Early life Marko Kutlić was born on 18 May 1995 in Slavonski Brod, Croatia. Kutlić moved with his family to Zagreb when h
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 0x66b4c2644fc1d98bce338d4d4e4ab4775234cf63acae687f4ed3be4dae2dedb9. 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/e7d83b40-48f3-42c4-b503-835c1374b4e3.json and https://artists.proofprofile.net/proofs/artist/e7d83b40-48f3-42c4-b503-835c1374b4e3.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 0x8b8c9bb9400e92211ef7f0a5a514f7120f4729dad9bce092b8d6f391e92c8e85. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HRA231800059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39541b14b8f2445ab7d3c5cd1dd70bcdfd4f5fa8a5d8567e54a700f9a909fc22. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/HRA231900051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d1208a8c51f5bac8fc2c48b97a3e99e7bb1d893decce29e63c11ed1db39081. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/HRA231900066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c5a956a56a2b44bc133b7393098c8002b82f79ec07b064eb3cd02489c3c009. 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/HRA231900076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62b987a963ea7d9adb11831fa682ce6eee9ae07598f7cc75f3eaf3f1174a4ab. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/HRA042392101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed3d8b1b1de41041c645b53871b4f7f6e1f20fbd3806a02cd0eaa84cfaf4888. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HRA042199245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780260046374c9c6eb6afb59c4c251c34f50e24d12c202eee196a0509cfad7d2. 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/HRA042201286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31541fdb4f8ebe1c03a1b4c2cba0c2603eb4fc278fe335c564be43df8594329. 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/HRA042202881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8730e82ab5ae8ec5e0cfead39ca10be517471ee9385037f9e7faf6468cd1f2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/HRA042300460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bf6ec64f099ba5ca3b136a194fce572caa50a9dc46172890134f2ecbc929ca. 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/HRA042500057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd473eeb38b048009200fbacb925e23d776ca6bcebbdef29b7523e1a4706a2b6d. 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/HRA232400043.