David Liebman (born September 4, 1946) is an American saxophonist, flautist, bandleader, composer, and jazz educator. Best known for his work on soprano saxophone, he toured and recorded with Miles Da
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 0x1cdb553e4579237c5a99da64eaf11579b1455e6f4184c6e21e323f756525b8e0. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/151281e3-3abd-4f29-a7c0-6ecd5949b5da.json and https://artists.proofprofile.net/proofs/artist/151281e3-3abd-4f29-a7c0-6ecd5949b5da.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e741f064422f22a56994d8a669ad31ac7efdc746d6c1a9efb1c1abf7fa60f97. 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/DEF301600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb7e924dcaa7bdf28d0337d8e329a3b739cba57481d8001011a31c2a682e387. 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/DEF301600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe84a043738c87fd6f4d4c52e8f411c8241bd2f056076334aebfe50c619bbcb7. 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/DEF301600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c7e7c1f20c25b1e6cee08f912cbd73a23c4bfb4eb32d8b6078d73594f09531. 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/DEF301600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81895ab54a266cf78440743fa642b597467daa618b27836ed97ac4c15adfbdda. 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/DEF301600004.
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
Marc Copland - David Liebman Duo: Impressions
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa10556e93eb30c675368ccde4968af57b40ab3440441cad342b8010dd815a31. 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/CACK41226201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72474a5e5db3647dd8ffd3285a179c52fb67f807bd36cfd0c5850f5ff11cce9e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM6N22294389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba3c6863494df2b42f5e15212486b8238e62d916c9c40ae295744a61b3696ac. 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/QM6N22294390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf4da3ecffed84dae002b193f2025ae725cc78db33c9f6f6ff4aabeec34ef34. 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/QM6N22294393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cdf593964df150cc0debafc9b6e50ba0d127f050a7a388aa563efb6bb656a6f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM6P42208444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09b7e4c1d15dbd0910244dea4623bd5009e8ef33cc651de6e9ab8948f8105b6. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QM6N22294392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0897b9424fbcdb27de94fb31ca254d0109d0f969f6452cc55130b83170750e. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QM6P42208447.
Water: Giver of Life - from The Elements - Water
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa695df38c5d7fa5441b9cdc34a88977d10d74d42db00f2df5ff9fd42a66fff. 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/USZ6S9904301.
Water Theme (Reprise) - from The Elemts - Water
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e82c50f1c3589f78edc50a06f38a758e2206661d0d37eb5b73d00fd19b34ea. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/USZ6S9904310.
Liebman Plays Puccini: A Walk In the Clouds
Quando m'en vo (From the opera "La Boheme") - Musetta's Waltz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b94bdb16680081dd296f4aca842dc1d6ddca9a9b418e42fcd3c6ceff4b001c. 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/USZ6S0104401.
Come e lunga l'attesa (From the opera "Tosca") - How Long the Wait
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9be4b8d11ef4fb830f634f0761d6466f91c1ff5b04170868390f3ee1700acd8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USZ6S0104402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4a28f8f592e22d14ecf858ae7451152c89b017bee688ef5835e4ae94d34ff2. 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/QM2KL2100160.
The Rise Up: Stories of Strife, Struggle and Inspiration
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9722da6d328ba07561405d7a70f5b8f8f857495dd86389635a3e13d334aff83. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USZ6S9724102.
Petite Fleur: The Music of Sidney Bechet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4950aa19573cf6eedd13864f5da9aa38a42b8a397c9667dd6cc45031fac956ca. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/US3M81804460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1d14d305aa8731555652d8e7a7e90eea8268109c713c6a3fb8de8cf3cd6d98. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/US3M81804461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfb1be34314d22d28cc7df60b25b99d121758a5b360ab55490f221b19bab9d7. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/US3M81804462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de5d7f9713fe17023789fd3954692460d1fddb60bdb8dbbb8db8d67794062a8. 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/US3M81804467.
Aki Rissanen // Jussi Lehtonen Quartet With Dave Liebman
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f352793319889be4d77cea0318f0afdb59017cae1b0facfa55607dc54d9ed64. 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/DEQ751400046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48042e9bf5ad35013676ff55a43dd6b84c6dba2097a224d9cde23c0619c8026. 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/USV291424302.