Zaccai Greg Curtis (born December 25, 1981) is an American pianist and composer of Puerto Rican and African American descent. He won the 2025 Grammy Award for Best Latin Jazz Album for his album Cubop
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 0x3d34de4d75fe988b11c16a6e82e776b66239b3fd9505b55b66f7e1a2344fde77. Chain 2 (Bitcoin): anchored in block 953618 (2026-06-14T09:16:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1cbe4d23-c826-44f9-8c53-e8c4a22b85f2.json and https://artists.proofprofile.net/proofs/artist/1cbe4d23-c826-44f9-8c53-e8c4a22b85f2.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 0x221853cdaccfd101067af3db42c37e13ecfa5b0976adddea748410c47d38affb. 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/USW972400559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9887c536defb229211cfa4e03d9a57abc27862d36ac8752620aa761d453b6925. 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/USW972400560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd602800ecf22b9165fd8149a07fd18bbb0c65c80f8bc1bf4a7454561ca56603a. 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/USW972400561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a40f0427e551a2ec27d0b49c3065d1fd312f04f42d3434201bf24c6051bc5d. 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/USW972400562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0587a1d44092849d5352632189ab446f954d6609c0a4983e5551b68e42332b2e. 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/USW972400563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d7cee38d03c24b2df0a66ee6d7f1ed0e886e534438f7cc56d20c032e6e69b6. 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/USW972400564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259767334de503b122ea40f8262dfbad59fc1695d3237845a2923321a207cb7b. 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/USW972400565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b5d98346eefd0dd61fc30e6d43e5dedf87efa15896efbd284e64906f41e23f. 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/USW972400566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248e5be4509aae21138ce380b82a846a6dbc104edaa52109d96ac34f8a2879b8. 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/USX9P2399947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43d518d0bc1d08e470c4f86231428ff1ddcfc116d3ea7ff7618b79ba391cbf1. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/USW972400568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a80d80feae5a7df99ca753cc5a9e6ed88b88229309352a564990cb881d4ad1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USW972400569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ca67f6b7d945358034eed8f2294f7d84ae3b06b5afb61a2d8cbe6588367252. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USW972400570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55d68461bf3942b7913e6cf0e4514b2c2646c2c6eb6fe7c39dc05221f431290. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USW972400571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32baa27b8c1b95aa2760fd6725331a2c6e0991971ea409605008bab882a01202. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/USW972400572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed47f8c5c9877ba95c3938e345902ceb6cc89519eb53db7006e06ec954c9cd6. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USW972400573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ac0a17b75c5e3dd2bae8c0cdb332a9008a3be7dbb31ac04ddcbfc0dc3653d4. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USW972400574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de6444424178dd53aecfe5fe7a7ae0e8396a9dde135a6310983b7658426d89d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USW972400575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2167d71f5ec6a706ab3d6956876305d3253ac9cbb9dd10f9f205a4dccbf3e19f. 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/QMAAK1627777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab55f86ef1760f8d6b2718a10767bdf8f513bb53069a638236cf9451ac9a74d. 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/QMAAK1627778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31262fb3ceab4adb8fcc28b41ae8b3ee8dd1978b08c89b60479b7626bb7aa054. 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/QMAAK1627779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44f8ddcdee26a0dfe273c410e663143abdf28f13cd7b96374feac69c9d3e422. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QMAAK1627780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecadbf3be150b9aba259baad1582d6ecb22266a038afeb2bb58619b3a5b8b9e. 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/QMAAK1627784.