Matthew Loveland Dennis (February 11, 1914 – June 21, 2002) was an American singer, pianist, band leader, arranger, and writer of music for popular songs. Biography Dennis was born in Seattle, Washin
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 0xe1c1288ca498dece0507c68fafc78747ed2d463b61fb1b982b1518e41d97f78e. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c1ddb53-0549-4233-a1df-e9bce5d5203d.json and https://artists.proofprofile.net/proofs/artist/9c1ddb53-0549-4233-a1df-e9bce5d5203d.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 0x3558e343877df0c691d1af9df5e507dd21238c37ae9dab233762d1f699b0dbca. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUM71615563 — a six-check JSON result.
Dave Garroway Presents Some Of My Favorites
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1818e923a629700f16409f1a65eebb31224ec03bda007d02a7795dd6b4ea4231. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEXO32098065 — a six-check JSON result.
Ballad Medley - Norman Granz Jam Session
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e021e561dfa781ee9e8491abe337f66112b5f4ddbb4bba7d7582c2ccfd59fda. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR10401429 — a six-check JSON result.
First Steps: First Recordings From The Creators Of Modern Jazz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8386d458da7bbd45f228e26947e2942aaf4dbfb875e4fca7edde0d67fb34233. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSJ10300019 — a six-check JSON result.
Dennis: Everything Happens to Me (Arr. Allhoff for Trumpet and Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1c5cbc58e46a76db68c98da1119ba0ca88cdcdf2cc5905388ad049df622e8e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBAYC2400868 — a six-check JSON result.