Marko Šelić (Serbian: Марко Шелић; born 22 January 1983), also known as Marčelo (Serbian: Марчело), is Serbian rapper, singer and writer, known for his socially conscious lyrics and eclectic approach
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 0x02a7c2beebcef2ba91a6badac58281e1b0cfe838a43fcfd18fb459a1d780b7b2. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fca8cf24-1b53-4c5d-b1cd-0c0284b42c97.json and https://artists.proofprofile.net/proofs/artist/fca8cf24-1b53-4c5d-b1cd-0c0284b42c97.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 0x67797d8c8e87dc53b6a3ae2a276803bc801393b9ab21e54a6c8605028ac8a2aa. 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/RSA221991414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf22e67ec11b85e780b69a8c329ab5b8855c7b19be63d0b8f9fbfca209dea2e6. 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/RSA221991415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550a9a14cd9ccd17e3f9a5b25a4e5b4051ff71b0deabd7017391395d0c3acb8b. 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/RSA221991416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf889819cafe7bac85f18eba2be06e14975133378a29cd1e581b5ed5905558da5. Chain 2 (Bitcoin): anchored in block 957056 (2026-07-21T23:13:25Z), 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/RSA221991417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd396f45d86495afa77def290fa9ef028339633dfe4c89d93d77ceb1624b189. 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/RSA221991418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6001c4e5b127ee95a75d6369c1836a8e4c9b46d5347877635c9df3d6da2662a4. 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/RSA221991419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4918dc9570d2d97e29c52646a8abb1dd1d9cd3cb3237aede5b8570ec819313. 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/RSA221991421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfecc88a47c0b370ff34d7484aae6de15e1820bf86399c6c952488ef1999c15. 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/RSA221991423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da7ecb301a36bd919d77c1d285e9de4d0bb1885b23ee6e2db666d5274b0bccf. 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/RSA221991424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa504e0cb960c064f3927a764aadd09eaafd2e2b9b016409e5b13011769a5d88a. 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/RSA221991426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa831761484abfe985b810219041ca1c4b4c0daf5119bf1b9cf012407da1dd689. 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/RSA221991428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32c308d24ea00d78e0157d71f2ddb8def1092e9332d65c2836a013aef9083e8. 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/RSA221991429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe885845cc13afdc08a6948b2b3df6ed8098a60fc95f39cfa5961cd88e9cb116. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:03:29Z), 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/RSA221991431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bae5a1c2ac95c0fc727408b1cc29ace0940dd4acf21d346ee60d6b7916cb051. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/RSA221991420.
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 0x34f6ff455e80becba1fc357ffcda19a76c02c395f47445e572fec6d740f7d16c. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/RSA221991422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d5459d70598a12bb396bc98533804f624cdbbb3c4407f7db3a6235d0fbda0a. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/RSA221991425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e179111fdc1777fa70f68db3011e51ab2e3b4baad742cea8305da326409d67. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/RSA221991427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254e44ffc4163c283a100a3f427e24e495e181d8e5c3423a696b3672762f58b9. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/RSA221991430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609191101d03d9ca223447cc726907c41971b29aff2215d62a010bcb1be2f00f. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T14:36:03Z), 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/RSZ141400106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66fc0a503bba55b540f78fd341cd1e327bd48852a402981abe45f16008bbcab6. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/RSZ141600156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045820d58d239221f2177134dce7ba6af6344b651b6ae3100b6bf965f1acaa91. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/RSZ141600158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13573f868c53e185b0c34e15884c411ff464b21b093bbd76289d98e7ead3fdf2. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/RSZ141400220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02f7ae6c09a2397f42370024ff083c220dd09df35233b0d0a6ad3245182b589. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/RSZ141600160.
Tri Boje Zvuka (Live at RTS Studio 8, 2015)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb21fd332c8ba6a25803918d3c4ae9fcc55fcbd914531cfe644170960b3f1dd. 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/RSZ142100081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5891632a68330e38494f0ddd35dc14815bc66a243ff7498a42ad6417d90b9005. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/RSZ142100082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb795c85bd941d8dc3b185082a51e34c36c1c45a2d18a7ae60909628b455018. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/RSZ142100083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ad3cf6da94f83be0124378ad01b63434d917614233935aab8ce9a82da4be62. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T18:22:59Z), 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/RSZ142100085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5951c3cdef3ea404476188685b87fdaf24229255d4c78a787a2aec1cbbffcb91. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T03:04:31Z), 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/RSZ142100087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fafd34ea28aea8006da79989f65a686de18e86c24994bb5342f339d60c5208. 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/RSZ142100090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1630921538b47979dcd88f171db9faaed4ded5310a8946a385fead79ae8e356a. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/RSZ142100091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa7a83ddd5dcb2c48a1a9763d4c9b00a0f05db2b2c7fcdd4da3300b73ca9ef2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/RSZ142100092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc0eabaa67c21e264e7d4c5778264af69d322634c0547c91c00e8c3e782f3aa. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/RSZ142100093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac811dc7fe130fd93f23239caa9ba7ea31fa9828a468c56d28ad0c214c7bfb0. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/RSZ142100094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a738e88a548e851baa417df2e3b66d53ae6f91d569c45e5c8ebeeda2052b1ac. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/RSZ142100095.