The Art Ensemble of Chicago is an avant-garde jazz group that grew out of the Association for the Advancement of Creative Musicians (AACM) in the late 1960s. The ensemble integrates many jazz styles a
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 0xbe27ed7c9f925a55f2ec9e02467c71b757fb2907000ddf6d1e928d984e258af4. 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/89f553c3-0ffc-4ac5-a109-8c6d9aa5b575.json and https://artists.proofprofile.net/proofs/artist/89f553c3-0ffc-4ac5-a109-8c6d9aa5b575.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
A Jackson in Your House / Message to Our Folks / Reese and the Smooth Ones
Bap-Tizum -Performance At The Ann Arbor Blues Festival
Bap-Tizum: Performance At The Ann Arbor Blues Festival (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 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 0x72c4cafd3ad399db8de88b2a04faeac964317feb9976b78432c26c1384d5d05d. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/DEB337812601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50c315323194e9658dddf2ef59c319cf22d55f59ce9bbd28871f14687e49e88. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/DEB337812604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a26050481022542b72fe1a3caf47f12abeefc0229d292d2a19bdd7b3b668173. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEB338016703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667aa19f17000e07572135a8142445e299107d48fa7df2b6fcf43ff2648433d7. 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/DEB338427301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531e0d3e02c2d249688dc3e2666ffecbbc504ea8f00c1135e505347a61f8fedf. 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/DEB338427302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46361ea0c1ab36fd397ffbafb508b5a9f97c15b6abc91f030bac1d4f535326ff. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/DEB338427303.
A Jackson In Your House / Message To Our Folks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a26050481022542b72fe1a3caf47f12abeefc0229d292d2a19bdd7b3b668173. 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/DEB338016703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bee845e1c4267e3101284dc96131c85fab3a555ad1934fb94e31e77748e6e0. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEB338220904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3192307fa666f995507bcfcd25eec184870f162bf606521cf43881bd002dc7a6. 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/FRZ117006373.
Variations sur un thème de Monteverdi (I, II, III)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40b104575bc0929e11e27487558fbfadaf68a11e9ee514d1aa55b9927495291. 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/FRZ117006380.
Non-Cognitive Aspects of the City - Live at Iridium
The Art Ensemble of Chicago and Associated Ensembles
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c4cafd3ad399db8de88b2a04faeac964317feb9976b78432c26c1384d5d05d. 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/DEB337812601.
We Are On the Edge: A 50th Anniversary Celebration
Chicago Jazz Festival 1980 (Live WBEZ Broadcast)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc76ee60a6177c5bb90f64f58323baade2375bb7080e6d5186b48aeca82c4743. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FR6V80006410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac526c5d4af4cacd85d9908c5c0de3fd9a6051b02ef2ef2ce0249669d320198. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/US4S41900019.