Marcus Vance Gloster (born April 29, 1986), known professionally as Black Cobain, is an American rapper. He collaborated on the Wale track "4 AM" and was the opening act of Wale's 2011-2012 53-city "A
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 0xea49e00d739abea8107fa56aa52d66dd51e2539a67401c9db3f7ed214c0ac625. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7a1960e9-07da-4fa8-8f84-390ecb4f6b78.json and https://artists.proofprofile.net/proofs/artist/7a1960e9-07da-4fa8-8f84-390ecb4f6b78.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Posse Cut (Who Don't) (feat. Black Cobain & Fat Trel)
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 0xc96e80764c22acb5ac1a1a7d04fe0b2bd19237acf43c21aa41d0ce642149dea6. 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/USUYG1424677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8dffb644f3870e34ef91e2e83dcaf411a6c7fdd49632a99d9c2c50e16c5f55b. 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/USUYG1507080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91a08e68be88551a36051ff7c0ea12fbb64bae4d33e39dffdfd416c7e311f34. 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/USUYG1507084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d80d9a42a1816181b7ee47396768739f45fcaed6d803650cdab0d7e9e5950d8. 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/USUYG1507087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23df9d76030ecb1c7c496df4315ea8d99da7060e9e7f23af80ef5b17913d6189. 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/USUYG1507091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecc41c020c9cd9877336d51f58a42dc42e37f8639b4c4ed7ae130375a20ecb0. 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/USUYG1507092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45b107585071dd867e3d3e892b50c20a2061c43822dfc329071801d59d0520f. 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/USUYG1507095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3b972daeab26ed201dedce9b5370d0850c5e2fd35ea59f1f4dfbc541578d3e. 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/USUYG1507096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5318cf2147b352d386fb04313d30f28dcdf13905f9d897eb34a5aa271687533. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USUYG1507097.
Ain't No Love (feat. Black Cobain & I'sis)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74384810c8c28761145030216b5000c3e9ff61dd4e61b0f01dee0796b94f5b7a. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USUYG1376243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3441c424f41a969dd5e43977222d8faef7349cc5c2a94eca153d4f50210e01de. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/USUYG1507088.
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