Alvin Gilbert Cohn (November 24, 1925 – February 15, 1988) was an American jazz saxophonist, arranger and composer. He came to prominence in the band of clarinetist Woody Herman and was known for his
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 0x88b19c25da421eaaf3dfcc7b48842853f28a6bffe806db653951e11d9266547f. 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/582d781c-5945-4d9b-b7f0-beaa9e922a6a.json and https://artists.proofprofile.net/proofs/artist/582d781c-5945-4d9b-b7f0-beaa9e922a6a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Al Cohn Quintet Featuring Bob Brookmeyer
Cohn/Perkins/Kamuca - The Brothers! (Expanded Edition)
The Jazz Workshop - Four Brass, One Tenor
The Sax Section: Jazz Workshop Under The Direction of Al Cohn
Jazz Alive! A Night At The Half Note (Live)
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 0xe5f2e1dc13d4b9766dcc3e7f7e7f1383dedde60a7cd9b06641fb1b404e1de7d1. 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/NLHR52069021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a57fdd5e56983fe4c1254da4ccd90749286a25a436ea6a500c52c1adfba645. 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/GBLGL1279555.
Live With Laila Dahlseth/Totti Bergh Quintet
Live with Laila Dahlseth/Totti Bergh Quintet
Four Classic Albums Plus (Mr Music / Al Cohn Quintet Ft Bob Brookmeyer / Al & Zoot / Bob Brookmeyer Ft Al Cohn) [Remastered]
Original Jazz Sound: The Brothers ! - 1955
Four Classic Albums Plus (Cohn On the Saxophone / Mr Rhythm / The Jazz Workshop / A Mellow Bit of Rhythm) [Remastered]
From A to Z: Complete Sessions (with Milt Hinton & Osie Johnson) [Bonus Track Version]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300b2e17ecb85cf45fc2642c8216655eae1e0847e16c0f979f5636e17a1cc517. 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/USB8U1064299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x668c95cd3f628853b9803b0fd8414054977d7e2d67696833355a270568dc2df2. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USB8U1064301.
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
The Natural Seven (with Joe Newman, Frank Rehak, Freddie Green, Nat Pierce, Milt Hilton & Osie Johnson)
The Natural Seven / Jazz Workshop (Four Bras, One Tenor#)
Jazz & Blues Christmas (Digitally Remastered)
Lifeworks - Al Cohn (The Platinum Edition)
East-Coast West-Coast Scene (Hd Remastered)
Jazz Workshop Four Brass One Tenor (Hd Remastered)
Milestones of Jazz Saxophone Legends: Very Saxy, Vol. 4
Milestones of Jazz Saxophone Legends: Very Saxy, Vol. 7
The Al Cohn Quintet Featuring Bobby Brookmeyer
Anthology: Golden Selection (Remastered)
Top 90 Classics - The Very Best of Al Cohn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9bed5a801901e518500ba0c49ac3058bdce79e0ca18305f31b8772a8aac3b4e. 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/NLHR52116011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1af666c5cd4a4aa55f74736eaa6caa3e126d3ffc26d216adafba8192b1e6f4. 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/NLHR52116012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e113655ed25388a9df77e42dfacc899bf739dc9d2c25a016af1c127c11d8624. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLHR52116010.
If I Could Be with You One Hour To-Night
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a94b57e66550e66cc00ef09f6c8fc581a8308fbf8185b53fd9bfbc86791a43. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLHR52116018.
Mid-Century Melancholy, Vol. 1 - Jazz Age Sound
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04ba52fec9af5b7572d5d074bb9ca7a5c2cd2e443352f73460857dfd2feb43d. 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/USFI84900069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8e729104bbc0669324a6902bb3a4d0caa3cbe7b2b1ffeafc0c312d30b3c1e1. 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/USSJ10200494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e6480b99ceb1cf05b56de27fd949e498b3e2776bf5bcfb1454f30eb0a054d7. 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/USSJ10200504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04ba52fec9af5b7572d5d074bb9ca7a5c2cd2e443352f73460857dfd2feb43d. 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/USFI84900069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79fc88fa42207905b892ea3fbd5023300f380d6351ff41e7037b920b3ea9e91. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USFI84900071.