Madvillain was an American hip-hop supergroup formed in 2002, consisting of rapper MF Doom and producer Madlib. Their only album, Madvillainy (2004), earned critical acclaim and cult popularity, widel
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 0x9c4b0a085308542100192e9f2a48f522fe2251a76506dfa79f25582ed49deb87. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6c7a2bcf-f118-4be1-8ef2-3326f3d55b91.json and https://artists.proofprofile.net/proofs/artist/6c7a2bcf-f118-4be1-8ef2-3326f3d55b91.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 0x1aa80d40d2106facfe1be47369f3b7ae09e67d3f7d28074bbbca8469a8f6716c. 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/US2S70465001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ccd5f6f60cd7c65cd6f000c048af503db63c3c08bfb65bd4dcb8d3fa87181b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00141db67311ad13f99cdf4f4486451e7819659ebf2e33ed3794e09e62dd083. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x327293d491454585e5adc7a652ce04b528d51cbd5a756dfe77bb28c1359b18db. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb378406c7d5fb2024ad2cf40ead3a7f3946751515896818bce2f667b786e8e02. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465005.
America's Most Blunted (feat. Quasimoto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55666074b75d180ed1abe273436e96477ce291fe440519d1c33355bbd749c838. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054957354e54a65d4cc66316698013832e007c2d83a5166dd0c33107cf6f743a. 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/US2S70465007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c264a985be9fe9e2799d0ea03fcd3d58e16a9591525467ea149c78617b36cc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b28d3f971b2140bd0ba87a87b00e6a7c4ed468ca0ef97fff2c75883bbc8d688. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f3f5e65fbfe2d55b341d1b73768c8fa2c85218491d2997fcfaed187e137194. 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/US2S70465010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372f8021705dd8f680434f0e535beffe28e769f0087934bdade7a7f3ce87e035. 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/US2S70465011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dacd61497d733f037040d682cc96b4df5439df30bad032b7d25b436c2297571. 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/US2S70465012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644ca8385c3dd7cdcec4eb23164b62dc5254d995e06055a2ca0f277380217c35. 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/US2S70465013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d22c7daf3a08900dbe65301d2b386ba2e5495722a86042303b60cb566a9b76. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc7104a257fdcb0c6ff2470c726b91e040c8d33d0d492d6781e0f5a12335263. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe105d10f975fb28ab1891be90db37827a64dd5d92e02b040e338d8d87071a89f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393ae4e829424bb5a7a616e87e24d851e11863124c067ee65d922efae8c9fd88. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57bdb4a0f904f245a1397ba20c21ad7aff06b1663b4b3138d6a8db8c7e01e04. 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/US2S70465018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989b350701267323260786598f7dc8c2699e6c2769e40a673aca0392a3aba468. 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/US2S70465019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9584f691e11639993aa328d9041064b44a88811aa48fe16d5dfa1e10817fd0b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa110d8d4d212492da3cad6e75d5195afb9b2c5472c40e746d2ed54d9a2f80f32. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70465021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853fb2f9d3458ab72538af01e81df8a9cc45bcf2c3f713e40b84afd1baf66310. 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/US2S70465022.
Our Vinyl Weighs A Ton - This Is Stones Throw Records
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9584f691e11639993aa328d9041064b44a88811aa48fe16d5dfa1e10817fd0b. 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/US2S70465020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d8dec57e4ba81eecfe4cfdc9a3db190d048ff021e2688c2d69944d75faefecc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2S70650007.