Let 3 (; ) is a Croatian rock band based in Rijeka, Croatia formed in 1987. The frontmen are Damir Martinović "Mrle" (born 15 July 1961) and Zoran Prodanović "Prlja" (born 18 December 1964). Particula
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 0xe20e1478249c5bd885aad48f4f0563d5690b95e2515c278f7e28b105d5afecf7. 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/35ca4a9b-4d2c-4977-ad53-53adc5391e12.json and https://artists.proofprofile.net/proofs/artist/35ca4a9b-4d2c-4977-ad53-53adc5391e12.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 0x3506c5b82b8cee82d68122fa62656f7cc76858f4d618898546f5b0c1de6d2634. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/SIA421000081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3af9eb765d49144a91a45d74c9f948360145b63e2192ecda8305c2a824bbef0. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/SIA421000082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716bdbe1001a218e1c2d69d6600b5bdd9018f11d89d2f0999f104701d130a190. 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/SIA421000092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda64817bb0fa0b2648ec53697395dc44a968753ed43e8780b521629526e89b1f. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/SIA421000097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af91139630037abc7dba5b69c7e627e995adeafc3b2dff465560bd0ebce1a99. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/HRA370500542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136e5c341f0c1a2cbf44de045277a17627f235b871f56a2b1fc35dc63e989aca. 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/HRA370500544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a65c7449337d3a6e1c859ddc743a20dcac7b22bd9195b15cc7117b019f43c5. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/HRA370901925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5ce358e11ebbcfa43b10ca94c50d12fb06be6613ae590eb8c5a0140e564659. 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/HRA370300214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55de35d6966d632d579d141aaf90e4b8a08c90ba7d94e3ebe7728612d83c538e. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/HRA370300223.
Mama ŠČ! (Sasha Welles & Shch Moron Mix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd546c938379f237b53ba37df9212f70de7e5b94c8a7cf22da27474c406f01749. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/HRA372200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e65a9ef9a08d69befe41d54402b96fd5df3255fd548cac3dac39a2de4cf870. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HRA372300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc9e587582d597999ea513004ccfc1eee509970162dc27dc5a3e5ac0dc02528. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HRA372300075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c03124affa9a677b1b132fb373d71c8878f3744a0b6907068e59d42b3f50f71. Chain 2 (Bitcoin): anchored in block 957531 (2026-07-11T06:55:18Z), 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/HRA372400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc21cbdb312ae35ef2ed49239169062889ced7bf1acd4f88cbd04cbaa6bd536. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/HRA372500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e5ba030462127a305e1512cee45b36fff0635b16625f2da4bc1602246e4b08. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/HRA041267162.
Mama ŠČ! - Eurovision 2023 - Croatia / Karaoke
Eurovision Song Contest Liverpool 2023 (Karaoke Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79f0fa9860a040f977d1a1cebac5ffdafa5ba574821f06d44348f2fd83a8ed4. 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/DK2DY2300059.