Buč Kesidi (, , Serbian for "Butch Cassidy") is a Serbian indie rock band from Pančevo, formed in 2013. History 2013–2016: Formation and debut album The band was formed in 2013 by Luka Racić (guita
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 0x6f865260fd5c6fd9c72222c1a259dc9b68a415d036c18f5cf541ec4d031bee7c. 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/2eedc3f1-c083-46d8-a815-555dcba2a8c5.json and https://artists.proofprofile.net/proofs/artist/2eedc3f1-c083-46d8-a815-555dcba2a8c5.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 0x4ee57f48e5fcb3d131d293dadcd36e51bc19b4ae77c0c50d4a6e8bcc2876eee4. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/RSZ141600308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2af42a6f37dc0d7f7c640d4f1af8417000aee4e15366fd3e26d4c08427dbcd3. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/RSZ141600309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae180de1ba482249117334e3c8bb998565edcb87e72acfbae9d2d40d350b2de4. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:01:16Z), 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/RSZ141600311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77fd823c1ada773c68ab8bc370b8dc2c8d6c98db1817044ff1d8ffb0885dd56. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/RSZ141600315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae180de1ba482249117334e3c8bb998565edcb87e72acfbae9d2d40d350b2de4. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/RSZ141600311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4dda245931a889e2928485b7fe537c4acaa5ae9e719c266b0dfe4d628e1b1e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/RSZ141600312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b8bf5ca263c4b26f2a93d0bc477128ca116e6aa207db834b7f70f9119b813a. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/RSZ141600313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd466978d90a60229e020c09d480272f23a1e6e43ae18e96ebd663c1f410f55a1. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:46:00Z), 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/RSZ141600314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c05438d6218c81562f08071e451867a5895c10620ad841847f04b822657b11c. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:45:50Z), 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/RSZ141600316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee73073fa2b63aaa140a4633910a0a231d169953dfe6895b80720b8638e5e40. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/RSA1X1900206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed710341b7364b0930e2686ed803b4d6fcb8f84bfd0d004204411527bf4bd60c. 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/RSA1X1900209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed02b918e617c7eaf0581455b98f5c9b123fbb2c61368759ff17a4c1af2b6bf. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/RSA1X1900181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ff47610ade0290b021e3585c527596c1513b859547ed552cc60b52ff269e10. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/RSA1X2100131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c36530079ba9897199df9e2dbc6a19926ba8eeada0a45be3db31ddb3a4c2b2. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T08:03:33Z), 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/RSA1X2300042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1b65132f75622b6eb94af2f9f05ac732c68f56866fb0c7dc2a1e4b143c0d3d. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T09:58:54Z), 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/RSA3U2400168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cbec37e511634b3a1fabf4261e89ca8f51b01e9c82959487b9283220aaa0084. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:36:48Z), 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/RSA1X2400169.