Michael Schwartz (born April 4, 1970), known professionally as Mix Master Mike (also known as Mixmaster), is an American record producer and DJ. He is considered one of the greatest hip hop DJs of all
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 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 0xf96ef4a115eb881c45ff0e7d51a373d50ecd234d06fe7a84879b9120786ed061. 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/978c0fa3-281d-4bf0-a36b-08a20b046033.json and https://artists.proofprofile.net/proofs/artist/978c0fa3-281d-4bf0-a36b-08a20b046033.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 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 0x70354b728562da7c8d40fcfb758f5aa325420643dbb65a52d6731884b53c1e62. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USME32000632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c077dad09a43b0462c6e38049dd8656686d12ef0cb3f7c3528726a4ea6e852. 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/USME32000633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e377f040220be70372a048b45717f51d2723e783cf5bae1c1f8ce13995bf47. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USME32000634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2028cc62ff33eb3882efb77651edeacb42c91b085f92ea2f8bff8b1b76713826. 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/USME32000635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5c030650673500942baf4574e2887720931d663e6ad317a2d86ec18e3c96e9. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USME32000636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a57b2153b9bc53af59e3b8bc38d86f9ea49694dab99b29d5a382fdc23c56de7. 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/USME32000637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1482a2a409bc44fd3ba365537dc221c362f4ec6cb75422a8d551a07946ed72eb. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/USME32000638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c75200bbedb6bbda0a3b510601b05345c46388fc22495ab4cf4877db33d689. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USME32000639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38f2e359651bb02436ff4a958e142315320d66749d33047a87628277755d3df. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USME32000640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4441b042ab7fbcafd0779dc7c0ba9c60577c425a5f2a51de69179c661bb78c6. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/USME32000641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb22393543092a2bb0260b60b8fb4cfd9f25c7615227061985fb6b8f731b402b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USME32000642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3cb8c7fcd6662f5d07001b0d1d6773b967b51188bcbc34799c98b63d2745b25. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/USME32000643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9e679bb697bd1abeb553cfdc4762d7789cf29380cd1a1add91a722eabf83d1. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/USME32000644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247313e77008c36c8c03ff46bbbdeded709c6fe3bf5e0ac9b3efa17a5917f3c4. 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/USME32000645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296360f97fdd4920332ffd0b11c405d91ded0dde0356f8fdd8db6f213da5e872. 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/USME32000646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc142b3341f5d7957d5b4af2fbad204feed6cae7b6bf4f8ca8f897552943847d1. 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/GBMVH1600140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30d9c2ab4af1170eacdcdced0c77ee81e4947df0a0248314f1da07e45fb30d7. 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/US25X2103589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25db06209fca1e0b85c57727a3425344244519913b9350e74b6b780eb27f8887. 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/QZH5R2000256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a954026129eff0f6683565396906d2e283db3fd1a216e26eb220ab36be1e19. 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/QZH5R2000257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3394f1ca55424e815e9556237dabb3627e39eac9371bdf56bdbead23dfa750c3. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/QZH5R2000260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e47b88463a9ff792139bd31deddb7d3b6c7d752949a5ff6cbaa3cc96e938c4. 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/QZH5R2000281.