Cabell Calloway III (December 25, 1907 – November 18, 1994) was an American jazz singer, songwriter and bandleader. He was a regular performer at the Cotton Club in Harlem, where he became a popular v
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 0x5b77dcf56c687290598f03f7957e3acfe6687b7e3fef234920fbfdd18173bab9. 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/c635fdd2-b797-41f2-9ce5-740dd8c4c77b.json and https://artists.proofprofile.net/proofs/artist/c635fdd2-b797-41f2-9ce5-740dd8c4c77b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Porgy and Bess - Act One, Scene I: Summertime - Live
Choir of the Blevins Davis & Robert Breen production
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 0x9b58c6cca899d0488c65ea461bf970b6015da8cd8093a9e8dc7a02b79a79deac. 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/DEE210840502.
Porgy and Bess - Act One, Scene I: Lissen to yo' daddy - A woman is a sometime Thing - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9e341c2113bdcc13416392e40785fbbab89f914be67a7951e8983d60093d15. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/DEE210840506.
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 Complete "Blue Cover" Series Vol 2 - Electro Swing 2018 - 2019
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658fefdd58d313a8cd7753d507e14b251a34628de33d396d1d862618ac97b59a. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBJCN1916302.
America, Vol. 6: Early Jazz - The Birth of Swing
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf438c3efd45939c1fa102b036d6f5a0ca099b2e2529bc747c71a4f23c1dd3b89. 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/FRZ332002180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44cde594337040be1416754db697928e8230c2708ef812f764c60737226f89f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBMY51400611.