O'Shea Jackson (born June 15, 1969), known professionally as Ice Cube, is an American rapper, songwriter, actor, and film producer. His efforts on N.W.A's 1989 album Straight Outta Compton contributed
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 0x59184dc709136b0e43f46f0ce92deb9217efbdb438309662ff5f52ef4d31e2fd. 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/d0ee1c2c-f067-432e-8403-c49ee162903d.json and https://artists.proofprofile.net/proofs/artist/d0ee1c2c-f067-432e-8403-c49ee162903d.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 0xd1edb153cc4d2bdb4b9d38d40e19c9d966463d6250b4a41bc38cfff8d71b110a. 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/CH7811114260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4fca05e88cca9979dccc63d48543cee088844917a86ed895d06673432c6952. 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/USPO19500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76348808b033ac144b5e1215bf5cb44072adbbf0f6041abc7dc646b1cd39176d. 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/USLD91710647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1e5f0646d5d63d4b9cb31bbfb4c204c8c503e57d84aca22ad51e303629fd00. 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/USPO10300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781a69af412379b14da1543ddf24f883cbbc8222ac7ec81fd9816e02fac89735. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/USUM71616303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ca61898ab07f69304d205f6db828cb39f64a5ba0eedd248acc2d0307da2801. 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/FR8GV1841620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431529e8adb9a13f290b483ffde9e00c152c87fce66a8bc5c66741516f622e7b. 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/USTV10400213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d9d4a56c28c3d7b4a5f0ba3e9a83ac0c923e176145c9ec94e17a1870394d4b. 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/USTV10400229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a192ddc428349fca348764e99c61d1d6651d18a2f814600d62f56e01e7d0f1. 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/USUM71013732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60441107f238c2afe55de0c821227b0abbf96fc59d4fbd71bc1dd2e0ba58502f. 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/USUM71013733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94eeb7a717327b2d9f667888213a0096fadb076d5512a83ea370e03ecef8837d. 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/USBB40706540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528fa155d1b4af50d0aab3bdccea1c7afdae75e929f503fc6b2d17ff36ecc769. 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/USA370947416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845022d7df0668e02af48b8fae3db298ce153a4508e04927eb2de56e34c96e69. 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/US5ED2202344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a614c93571bd9a69ccf89ff5461436e714bd584c82f3e74ebccaea56695015. 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/US5ED2202345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c452dbbabb5a697544060fbc73a523fae7f446e4eaabd5c8d393e6e43006da. 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/USUG12105378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19ecb110ff290086caa14bb28d03a95ba98feced916d51e513e0444abf63738. 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/US5ED2202183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce7ecb50078e7774a5d591fa7541d54a1efc98736c6a6a1fa1bda37cb77cf64. 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/US5ED2202347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01024734d7095b04a3539d4c8c1d6a449e2bfc046ef1973e6c039d846afe0a2. 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/US5ED2202348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4877d9f3bd1d85724845d74091dc2969e7bcbadc98a0b80e125c087117325a86. 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/US5ED2202349.