William Paul Mitchell (born March 21, 1972),Large Professor Rate Your Music. Accessed on May 6, 2019. better known by the stage name of Large Professor (also Extra P. and Large Pro), is an American ra
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 0xe03999e01073504cf3c1c9ad82036774dc833c10bf65406ae7996f84efa1e500. 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/924b0c1c-074f-49e3-9584-05a33ad6947c.json and https://artists.proofprofile.net/proofs/artist/924b0c1c-074f-49e3-9584-05a33ad6947c.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 0x6c77a4ab53ba1f476b81d8713719980c16e21dba327830b9aed1063a24fa2d11. 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/QMDA61857492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb858d06aad4f0d7b93e14f32bd7412654ad3f18e2321a33e7e0d3fd0a111c75. 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/USL5R0800703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0857aff89223398e0e8e2d6554480654d3899e3a2ffe9ff34d5ffbda65503352. 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/USL5R0800705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3abca65abfee89e05e59ef137619380ddab31c15eb92379bfc97352254e0568. 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/USL5R0800707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91bb508e19fa80689b675e1d03a33401b5a0e2f85a94e824923d2956c7580d3. 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/USL5R0800708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0585e9bf7fc0e4e25f3aa5310e6ffc68c9dd5ee3cbfb4ec26cb300cb5b08dbad. 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/USL5R0800709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11e14eeaaa9b1b70dd83d70704a6e946dfce77f76736c99898759aa27983dd4. 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/USL5R0800716.
Maica Living' feat. Killah Sha and Guardian Leep - Instrumental
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c51db5a5c0b8307583fbcabb9f53f422c7d317cc7b003dd42183c64bd9b443. 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/DEG930820089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a12965a6ae0500e0e8a3319fbf7cde3be624bc8d1fec730c49cbdb7f3d5d20. 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/DEG930820095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d5f8ad95ea1bfcf39e34b47551bbde2e5647ba43bc1547f7939a7e1fe1d9bd. 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/DEG930820101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cab56caf839f237aca0710010cda9198853e9ebc6fee6bf2b65dd40370d950. 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/DEG930820014.
Entourage (feat. Tragedy Khadafi, Treach & Joe Fatal)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf41f8bcc7f71925d9b157b308d619272eada683e90d42a35c1e7144e64d6da. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USA561461380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446e918e40ab31719bfd0669a5e87b7cc185804a5b8d99904c646750016e8f6c. 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/USL5R0800715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa040057357c4daa81ef3a87667b9358740f3b6bcd24dabe1570319d670684e8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USCA29400100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a6da0f895d8d2742c6351df17243b51a8b819a4948cbc61b410735d5105ea7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USUM71206660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66712199d62655185e35a3b4f6818de5458bdd793d0124e8bce0e90204f59dfa. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USUM71206712.