Jason Drew Harrow (born May 11, 1976), better known by his stage name Kardinal Offishall ( ), is a Canadian rapper and record producer. Often credited as Canada's "hip-hop ambassador", he has been reg
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 0x4f2f2b3d08028c1f5b0554e85c6d0e19c1489362c9e596b60609bdc8656cad25. 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/57eb8258-71d9-456b-b25a-2c5716cea34c.json and https://artists.proofprofile.net/proofs/artist/57eb8258-71d9-456b-b25a-2c5716cea34c.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 0xb4eb7fbc7fd7392f4c914530618339163fa70446fc1ea5d3f88516a4eb3cc313. 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/USUM70830921.
Sooner or Later (feat. Kardinal Offishall)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebae91ee4957c1a7b8f5a94048fb274bc2584d193ae0d4bf11cdcdc4a6ddbd47. 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/TCACR1694481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56cc8a1c24814588b98ccdfa54a898d52d0dd5ada6103a640c6124632151d94d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USDJ20400849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2862c9a96e0032e6519e2a2f6b0e604b0c022a4d61dfd16a9dc567fa7f865aec. 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/USUM70502338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677a4f915e6f40edfa46b46fb0a8598ba61d360476ce97188a23ad069d14fdf9. 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/USDJ20400444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf911deebfd1e0595c5ad600d3001958dd5eb7ae511b5a4f6bec7e2bd3a58b5ab. 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/USAT21000226.
Colors (feat. Vybz Kartel & Kardinal Offishall) - 2007, Reggae Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c54b91f981327541cb26648448ac7f0d3cfb1f793e14a8f121df4a678133cb. 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/USSM10702591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab92fe3a94e03dc9123c96b572b2674cbf8e1a76805b339904514ad8b83002b. 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/USA371360403.
Baddest Chick (feat. Ray J & Kardinal Offishall) - Ian Carey Club Mix
Baddest Chick (feat. Ray J & Kardinal Offishall) [Ian Carey Club Mix]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8893996c89772bb9c81482fb72707126e86562cfdf09d50afe5f48d4952b2d53. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLZ541300741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213812cecca5c790992e16b16d2ba6482de6409f3fbf98b575af6e0f7c43ddb8. 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/GBEFR0901869.