Hubert Charles Sumlin (November 16, 1931 – December 4, 2011) was a Chicago blues guitarist and singer, best known for his "wrenched, shattering bursts of notes, sudden cliff-hanger silences and daring
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 0x402657a306bc22a89802faf71a1ceb865d11856fd630842578fbbc16199d68ca. 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/ef1f85cf-9df8-4cd9-a4b8-11b0fc1c0522.json and https://artists.proofprofile.net/proofs/artist/ef1f85cf-9df8-4cd9-a4b8-11b0fc1c0522.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 0x42addb7551779079e224c2dcbad6d2ef125505acf6c63c390299e75c4cef4b57. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/FR6V80314636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba805e77f94f53ebe35996966e678bff03ea80d456c74e9acc8977a06fd09b6. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:51:40Z), 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/FR6V80314638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa346671ba40e1e8e1f1837145cc955662a5683f5e0089a9be6515f591edaf006. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/FR6V80314640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51aa1bcea8699c0306b7b2663ced656fb54bf4965769995c5b67ab6affc783fc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USSE90321484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28b6a60368fc3c53568419dd8b0e625ca0cd09593c3c448a4b33b84f7152513. 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/USA370571686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c95d20f3cadfa3c8f5138aae7c34dd29c0d827858bf44ae33836f4febb20fb. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:11:35Z), 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/USA370571687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75079a586a30dfcbd2e567c03f664d40cb8791dfc6cf723f0a1655dde36dc726. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:00:59Z), 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/USA370571690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8eb5008243405334a14a9ec0d51b51c99ad62b947eef4a76bca884aeed93b8. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USA370571693.
I Love the Life I Live, I Live the Life I Love
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6fd154cb4203b7418b70c2aa331188587266ce63e9ca02a668b162f796ce16. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T14:43:21Z), 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/USAR50451574.
Hubert Sumlin, Rod Piazza & The Mighty Flyers (Live)
The Devil's Jukebox Vol. 1 (36 Black and Evil Blues Songs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7420221e15c6d672764927991a353a0ca0963ca8d65d747dd85084cddcafc584. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEXN92346618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9f4b70c791b8f1c241eb2cc6e85ebf72f90a1166693705b57554451e1c0bc1. 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/DEXN92346631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6168ed5976c7c213445e94240dbd8e4530b1a94a1be44745cda32b19a7b9188. 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/USA370571713.
Blind Pig Records: 40th Anniversary Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe135fe180cd5cc182c4356bd97dc0bedfccee81993d5a460216f2c23464a195d. 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/USBP10373303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a115dc225d8fe30274e7dac1fdadf41e9db6c4bb87a3c289327cc552a1faa6. 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/USTE10442702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0dd359bc761e68e0b5053eac051aebfbb537eb3fabbe2252f73d256d0830df. 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/USTE10442708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2606a468636f36ed800dc8f5958da68c7a40ecae98d3fb8f959cb626d25597a. 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/USTE10442711.
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