Grupa 220 was a Yugoslav rock band from Zagreb founded in 1966. It was formed through merging previous instrumental rock groups Ehos and Jutarnje zvijezde. They are notable for publishing the first au
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 0x7b16f3be5b945b605f94b3c557967cb9a019346acc0956f47b549433dc02e5d4. Chain 2 (Bitcoin): anchored in block 953627 (2026-06-14T11:43:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2f5747ee-a800-4d10-920a-1dd9bd8e772b.json and https://artists.proofprofile.net/proofs/artist/2f5747ee-a800-4d10-920a-1dd9bd8e772b.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 0xe362bad3f5bf2f1fb79de32ed8d50a70a04628c35b8caefea3e98bedbd3911b5. 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/HRA040838455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21031f20ea0829e8c2020759aedf762eadd79a6e6803ee04810b1e5618c38748. 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/HRA046643782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8683baac52bd7b6896c50bdddb58f33ac0cce13f8ed585457cd00f4bc69c0c9. 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/HRA040649021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58beaf7718efea7b5a547605561a6beb59e9dcf80406bb37386db9be7cc70df. 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/HRA046046853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd1fe33ad3f685793062188b13e986bb50957d911cd2b3d45bbd23d65e9ced0. 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/HRA040755072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f10a68db4ebd12e3192b5d9de4bbc7e950dd89bda720ad4e7d2069e12a3996d. 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/HRA046440238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f9a54338d6240de7e457920c85d9e5ae93c15b7e83990bddb5352ba3fbb22d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HRA046146852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc504717461042db81da24579f28bc1c5548a0840c209205457d3aed847d31d50. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HRA040858589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f595ff0d5b1174241a3cc5436c1d1877e2cfb2efb6e6530ea6115edbe6a1e77. 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/HRA046707415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d90de18e76729d83adb31e8d601318982610b63f3b8a064625df162feddf9f. 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/HRA046707416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37e535d597d24d08aaf382f51ba3ab1e59f491403f16b37c4e0ebe0e92d80a2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HRA040607428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff21b0a10d201623943cca10d76262e76f044b7467f01e0a7645ade6084b206. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HRA040607417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa702aa776e076d31dd4de4db73866f8d158aeff80192b00e76fe6193632ea400. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HRA040607423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a69f5b3728b016464e7585439610a14b5e5f1fefc49488a425bd8441d2cd485. 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/HRA040756390.
Mozaik Knjiga - Radi Se Jih Spominjamo (Box)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f595ff0d5b1174241a3cc5436c1d1877e2cfb2efb6e6530ea6115edbe6a1e77. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HRA046707415.
Velvet Revolutions: Psychedelic Rock From The Eastern Bloc, Vol. 2 1968-1971
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28424623992fac31fcbdfa004660c9db4237845ba90ee18a09e5112ecd52030. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CYRLD1501210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x288139fc84e66b6a0e6d20c70274e1dbd10f914c75a9864f5649aad79ab6c045. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CYRLD1501212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5ac443e1346bd93e83bfee3d034540ef63e96f1472239c3ab64d869e0c6216. 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/CYRLD1501225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f595ff0d5b1174241a3cc5436c1d1877e2cfb2efb6e6530ea6115edbe6a1e77. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/HRA046707415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d90de18e76729d83adb31e8d601318982610b63f3b8a064625df162feddf9f. 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/HRA046707416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0b8dda7f17376450b7faf1effdeb615f2387765413b0ecd5b6c34364323e0b. 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/USJ3V1304992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe14f79d406a1168fddaef9e4068f39bd6c6d2263fca9befae29939e7390e00d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USJ3V1304997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4bb0fd9c733dff8eea2f9788fac1e60722b713994a49ce41a33a02dddb5f8f6. 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/HRA040631208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb4984f0aab809d9425cc35c2c65b237ad98b039c94ed4dcd7356134de88d35. 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/HRA040614656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0bac4f6f01d46bbfe3479b400211b226fb3eaccd9ae6c04b87699d142d58b9. 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/HRA040631209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766909d6c2b1bd0c443cfc9fc451313ce20c6803c4f7f28eb1181b214cbb7448. 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/HRA040546982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0abf13245f6e8491f4574e62749511abc32ea10d36d220ea9117b3ce98d9c5a0. 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/HRA040546987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85cbf5b2080a565fa5cc1dec6511af5a4b7fdec20d6e8ca11bedcc51fadb5d43. 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/HRA040546994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d411d43c11b0fecb41fd359645192f9606f9f9f36103fd06c046853141d783. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HRA040718272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229bafbe30b7b10441e93fc2b7ae1c2e9f2fa74faab7da2e4bc46fea85ae9f80. 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/HRA048511053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d16f5d48c5df80246244f838c5113363d61ab389f5c8656d697562aa0604237. 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/HRA041480268.
Doba Električara - Instrumentalni Rock 3