Malcolm Earl "Mal" Waldron (August 16, 1925 – December 2, 2002) was an American jazz pianist, composer, and arranger. He started playing professionally in New York in 1950, after graduating from colle
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 0x9a77b9d734525956826c443226ade80a048885fe7c65970fc5cb35a2b08b571f. 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/a35cf335-6d54-4fff-b3ee-ae9a727d6ef3.json and https://artists.proofprofile.net/proofs/artist/a35cf335-6d54-4fff-b3ee-ae9a727d6ef3.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 0x85da22b045ac9cab3b32a97c8df2c754ed53ca3659fb11aa125d38895e6e9028. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/DEUE22382069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35c4b5ec8ea2b98c5a777fe3bc17aa6d6424848493ee4ed2962c905e8e81fb3. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/USFI86200569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69694971b93486732d185c4a5594b30f4b4e82dd25ca1396f90423885bd3ef2. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USFI86200570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f498c17425cecbb930a813a22a296848cbd8c1520da8b5fa9b22175d861368b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USFI86200571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560c6ad54d4c3989f7575d6ac2f44ec5ea5291ef866c3ae687a4283700858905. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USFI86200572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b340856b5d41b427b0f087432cd58068c047742bc145087e0adbcaa6cac719a. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USFI86200574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896d527869ea62c1f8c3fd1d89d92ab67adf55980cf45a898c448f05765ceb6e. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/DEVU51721411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062d90640e5a977e30fcfbc3fd38f73257c809039742e11800204cb71614f8e2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEVU51721412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9919fc61eb984204d46a8eee62a3591c75501e28220f6e339886d816c5be000. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/DEVU51721415.
Mal Waldron Plays the Blues (Live at the Domicile)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2115f75e22c18cdedf58a8bd5746b254eb641976fdc13eb24e00e003d019a09. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/DEAM89500016.
The Essential Jazz Collection: Left Alone
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2301a0545d033ecdda76319e299719943224a5551260429f8cfd190baf7a10f0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81036570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7685d5419d605244a4504d28711de9f1cf2a76926c47767c97b333ca2c2e55. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/FR6V81036572.
The Quest (feat. Booker Ervin, Eric Dolphy) [Original Album Remastered]
Best Jazz Players (feat. Ron Carter, Eric Dolphy) [Remastered]
Mal Waldron. The Complete Trio Recordings 1958-1960. Mal/4 – Trio / Impressions / Left Alone
The Vinyl Masters: The Prestige Jazz Quartet
MAL WALDRON - THE GREATEST HITS VOL.2 (맬 왈드론 히트곡 모음집)
MAL WALDRON - THE GREATEST HITS VOL.1 (맬 왈드론 히트곡 모음집)
The 12 Days of Christmas with Mal Waldron
Plays The Blues Live At The DOMICILE (Remaster)
Searching in Grenoble : The 1978 Solo Piano Concert (Live)
Four Classic Albums (Mal 2 / Left Alone / Mal 1 / Mal 4)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81680522776a52c4cbe67d6091b056551714e66edcc18c30bfae54f2b8b1e7b3. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/ES49E2300271.
The Mighty Warriors: Live in Antwerp (Live)
At the Five Spot, Vol. 2 [Rudy Van Gelder Remaster]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd52bc2f9e2f209f89f6b18a55f489bb8d214e59f50def03fb8fc57a2786318. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USC4R0918946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0951d1682441f5419ac1a163fdb72ef63d8ffa5c1c22c7eefcee4a9d8161c4. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USC4R0918947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec17ce67a3295d17a7f25f5aef8b69defc511391bb21755072e2fe7851d6692e. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USC4R0918949.
I'll Close My Eyes (From "Two Guitars") [Bonus Track]
All Night Long / All Day Long (& Bonus Album "Two Guitars")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53583772d110665e18c2d320950ef2a42e7e7b0cdecbd0a35bc67dbc9440a28. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ADA010822215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a75dc52384f7b1c8c5103327d40c73a87412719897de958694659b440e6a820. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USC4R0918948.