Paul Laurence Dunbar Chambers Jr. (April 22, 1935 – January 4, 1969) was an American jazz double bassist. A fixture of rhythm sections during the 1950s and 1960s, he has become one of the most widely-
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 0x8b5042b4b6424be7655b0d126b417b4e534f25e61433a59e66af24d3e8f67e4e. 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/2a3f68de-0042-46b1-ae59-a67c229662a5.json and https://artists.proofprofile.net/proofs/artist/2a3f68de-0042-46b1-ae59-a67c229662a5.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 0x7147475629b05a8423962abafbad49f316cbcbe7423b336e31a561f71b51bf57. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/UKR791839279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7e924e055d769125be7fe437df1e7b55e97c9758b061431cc0c8e553e38722. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/UKR791839281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15561d232fd5137b65db2dca881cc3d94151cbe3320372e2ed142f307f3b34ab. 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/UKR791839283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04509814fc3bd6932e6ca8874ed42953b1582bf7932836b50be41c27e82f279e. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/AUXN22383239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28cd874a1f0a904f0843ce75b54bc05203003e60d867c23daaaf7e9ecb80a317. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/AUXN22383240.
Modern Jazz: Paul Chambers - Sonny Clark
Four Classic Albums (Whims of Chambers / Paul Chambers Quintet / Bass on Top / Go) (Digitally Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb472ee52520f80dfa303bc153b5640f6b147513135fd70802ed5bcfaa0c89895. 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/UKR791839251.
Chambers' Music: A Jazz Delegation from the East (Hd Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8e999f6afb30ebc5b94632b40cdccb93937d85187818a572c912136861969c. 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/ZA01G1700131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb8869021f58a2615a0c3548e10766b464e7278ab14907a52c3bbea83ed5826. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/FR6V82679716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d865fce22c0ed7428ca694147f4189a27e0c39e387b1cd5a87419b857dbbd2. 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/FR6V82679717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52afae73fc387e8d74913adf099c6c4f92caa4147a2c334053dc9c530045b76a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FR6V82679718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235d9f9d676a6989be08d307db6541f9b09fd799cfe15445908b4e6eb9341351. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/FR6V82679719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b159fa050b6309010772175962d29dd9571dee970918f8c958be775be681e8. 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/FR6V82679720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf266709e6a60a27dd3b6e303e1dd917d896d578332a2b2b6a500bd6d6b517f83. 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/QMFME1404121.
The Cool Jazz Movement, Vol .50 (Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeec6d8ee5d719d4f91b4bdcad8f2ecb04a65517c8c141475d76cde5b76a8ac4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USFI85900516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585ec9380240288ea8bdac9ece90964f7546704b58a9dc6964700149300ddc8d. 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/USFI85900517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770b8e69c9804a543233d3fff6dce88b2addda0f713f9082e3f2d9cf2d1f8b21. 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/USFI85900518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d3e3d473fca6922fb28b48ff6db93d59e44d1f081d2506241ec20b0fbb86fc. 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/USFI85900519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343074544e41e79c8b97b1ea4ffac8387fbae3dfbab900a3db1fee105b9c1b51. 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/USFI85900520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ee350ececbf87cd855e6de6e2e5126d3a9a5a18e2c7d616f242156d704adc9. 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/USFI85900521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6b87130ad277f5710097726906201bfe4967d249464e44e2a9aae4e349244a. 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/USSM15600497.
Freddie Freeloader (feat. John Coltrane, Cannonball Adderley, Wynton Kelly & Paul Chambers)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb22291a940d0726883c097be3abea76b36d4243c1e6cf2a11ae3054980410b1. 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/USSM15900114.
Bye Bye Blackbird (feat. John Coltrane, Red Garland, Paul Chambers & Philly Joe Jones)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9accc46ebe2de2d087d861e2e3b7d98d1aa258e49d8f293cbf14bf5f34c874a8. 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/USSM15600486.
Milestones (feat. John Coltrane, Cannonball Adderley, Red Garland, Paul Chambers & Philly Joe Jones)
Music From and Inspired by The Film Birth Of The Cool
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb0d82ed8e05cc3f4e78f22c05007a3eb405858b9ffdb90e8ff929ef6823ac2. 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/USSM15800672.
'Round Midnight (feat. John Coltrane, Red Garland, Paul Chambers & Philly Joe Jones)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6b87130ad277f5710097726906201bfe4967d249464e44e2a9aae4e349244a. 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/USSM15600497.
Someday My Prince Will Come (feat. John Coltrane, Hank Mobley, Wynton Kelly, Paul Chambers & Jimmy Cobb)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502e8387b5f3de28247fe9f6ac54dd39c24d39bf7939eb3dfcbff11474cb02e9. 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/USSM16101199.
Best Jazz Albums of 1956 - Gerry Mulligan, John Coltrane, Hank Mobley, Vol. 8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4125ea359e8460d494a9a0abbb8ce32931ca110077e9feaba7b55286f4fc2e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEU240700073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1442c3cc55e47d7691bd4b275b0ec80436789de15f6bfdad6218cf438da48ba3. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEU240700074.
Ah-Leu-Cha (feat. John Coltrane, Bill Evans, Cannonball Adderley, Paul Chambers & Jimmy Cobb) - Live at the Newport Jazz Festival, Newport, RI - July 1958
Miles Davis at Newport: 1955-1975: The Bootleg Series, Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81529d14d9eb45a03e515b1f5db0ddb1bcf7bce40f313e9cdd859dcbded99a4b. 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/USSM10016691.