Marc Cary (born January 29, 1967) is an American jazz pianist based out of New York City. Cary has played and recorded with a number of well-known musicians, including Dizzy Gillespie, Betty Carter, R
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 0x0dd0fb2a50853b8b65f90d8c5231f54c66954d72e9e2d2f9dc6ed779888177c9. 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/4fbd660e-ff69-4faa-b956-22ff6b09ec70.json and https://artists.proofprofile.net/proofs/artist/4fbd660e-ff69-4faa-b956-22ff6b09ec70.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x67478447d05d85eedea9deb85f578267a3c6a3d217a8e9b418bf939efe8713ce. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US9331416803 — a six-check JSON result.
The Emery Park Socket (feat. Indigenous People)
Blackhouse (feat. Indigenous People, Matthew Whitaker & GoGo Mickey)
The Trial (feat. Roy Hargrove) [2025 30th Anniversary Remaster]
The Trial (feat. Roy Hargrove) - 2025 30th Anniversary Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920821ada3e491e39996dbce31285d9398ba9b7b4b13002a2adb4cdcffc051d1. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZJ5U2400019 — a six-check JSON result.
Cary On (2025 30th Anniversary Remaster)