Jamal Rocker (born June 14, 1975), known professionally as Mac Mall, is an American rapper from the San Francisco Bay Area who became known in the mid-late 1990s. Mac Mall signed with the record labe
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 0x5ec9e71d368a3af0a5e3a35b9aeaff59e72bbe13682a81bae65a6d2fecf1900e. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/acaa7f64-443b-412c-8be4-17ca95607b7f.json and https://artists.proofprofile.net/proofs/artist/acaa7f64-443b-412c-8be4-17ca95607b7f.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 0x84cc15414fe649e79e5360fa0064825687174930c23e20b870da2fa01b27da0d. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/USSM11801819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441ad15d816e49ce43785787d5e7a4a333c09bd07c27ef5beb6c9b87f1292352. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USSM11503757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4390eee7eb7b8f119d69a053957d36e63470c0cd631a379fe33f549842d43cfa. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/USSM11801826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082685eb5a3e68155e3baf461493dc1528d7933c0438f9ed901f4d82a8d462f7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USSM11801829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77d02b7d36392df943dfbd8459004355f00a1fa17ba596b6fec1f93a35bb537. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/USSM11801830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8617665ae23cf8677ed3f8f44c7ff0e5ce57ff2c73ec2d510b53230e0c841f0. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/USSM11801831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecf1f7e46dfe38469b9a81661d22c2b49002b43e09d0dc474dc7be0175a2768. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USSM11801833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249318a27e48aee1c3df75c9b8c0ff48ffd0534164bc49c574ee73a281fda953. 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/USA2P0826236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60db8b98d371d001340cfcb24e5d4b5f7ab95479aebca77c7550bf1ed59027bb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR0Z50036327.