Sharif Talib Lacey, better known by his stage name Reef the Lost Cauze, is an American underground rapper based in Philadelphia, Pennsylvania. Cauze became well known on the underground circuit toward
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 0x9bf4406666c2c43b3127f44391880c2ca3aebe1611fba8c8d68d8f35dd872b49. 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/082ef7f4-d4d6-4b5c-92a0-0c8105a4106a.json and https://artists.proofprofile.net/proofs/artist/082ef7f4-d4d6-4b5c-92a0-0c8105a4106a.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 0x43f471ea1b11bc56bc07efdee1e50ec62fd86523aa9257c87424c9e4f5327dbc. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/USTCG1030118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d24247759107582d540c2a466a00929372de237a4ab33872622f0314a11835a. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T22:07:51Z), 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/USTCG1030144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8152a42bc357400d0bbf458335f90df06b0463a661e0431028e784d1b4c60ef1. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/USTCG1030157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2675ef7ed501b365daf41efddf37aaf368fface0c146feeb417d82b083cc76d6. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USTCG1032152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1ac6a332ef86873aa4e77fe1fac94feca04107c685e664e88597312c7bea94. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USTCG1032170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775e2bb42c50df5a3c45254c728e3cd5a849734ef594eed6aea537995fc228d7. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/TCAAU1000288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6d452799c9a1858f56a1b21889c2cf8b113e12d152dfe732cbde77def9d244. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/TCAAU1000290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43295435929c18446dc975e890e16c0277b257a7195c240e9ca75235839d4607. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCACF1507539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1b39f431db84ba3b0ad6711c2163de42707686bf6c0029943e8bbc96cef3d0. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/TCACF1507541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b3a8151c96f9523a64d85ed9621d78f217d521822a8c3eaa7f2bf9c5fce913. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/TCACF1507559.
The Level (feat. Freeway, Millie Mag & Miss Daja) - Single
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1530b0afb47aaefa255eaf990df627b10e9b4a4685194264f57ebd2ab98124cf. 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/DELJ81622173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71cd76e216c8fd521ef2dab78c44da0ec50e0a57c68d24727bb7ff7f12bf5295. 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/QZHN72203746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3836c67b3f6517fbab1662cb020fb2474af292dea369390bbc1f4e1679bcc00a. 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/DEZC62146173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3b230b37243be51c5fb4477dba4c521baf8cbf8a17a5d7c809a037bebedef09. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/US6YF1900038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb518d858dd3c03c106f4f805a37b0fdaac06723736130a5a9a4be8f22e69c3d9. 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/GBGZW1300255.
Money (feat. Reef The Lost Cauze & Roc Marciano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd2a6cec8f268707bbd36baeb81eceee939fd1d268bbe6f518f022292cab77e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USA370955596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea60c9832c2d8f9376eb7ae9640665517669e0a16e4d47406ff2f345e3b1c3e. 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/DEMN91500208.
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 0x4c8c8818b3d24d4b63de730ad1a4f7bbe6afae72ab4e188a311ff7c346d53af5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US6680917300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448dfe83fa570922e548b21e9d456d82a67231804a6ac64ba000bee49f57f6ef. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USA560861935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b805bb523cb37687c2f8b4a9d82c41587b9854d21ca329a9ddc6b126bfaa5e7. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/DELJ81913830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8521fd4f1396738deb954c3c5292ae1779379ce6a38c22a1f94b09285ec1349d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEZC62274774.