Eric Frank Penn (17 April 1878 – 18 October 1915) was an English soldier and a cricketer who played first-class cricket for Cambridge University and the Marylebone Cricket Club (MCC) between 1898 and
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 0x35a581a4dbfceb8bd18def3c274def1cd1f9d78f1062eb66e1f5146a2a46b9e5. 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/4ee05f09-27f5-4f68-b21f-0fbf73889156.json and https://artists.proofprofile.net/proofs/artist/4ee05f09-27f5-4f68-b21f-0fbf73889156.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 0x97fa35b15ce5abdf6d0a17036fe7911f585cd77c34274cfea53282ee244144d2. 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/QZTB82436460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d70fae979a45cab38cff9b9f5b52f3fcf0ecbe70ef38d04fe8f4b531144cf78. 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/QZTAW2489651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe884e6cfb6fc342edbdb8b5b00721e5df40c870aa8b98413de400abce6255c00. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTB82436461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f83986f4371d766a9a6adda059184128ca78d9048b099688848a1459d4478c. 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/QZTB82436462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe868e71db007bea16dee74ad5e9745ce6ad05d065fd879ba37e4cab5589b4ca9. 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/QZTB82436463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ad29b616d780f2aa76402241aa1eb89b6e690cbfaa6b4f0c0c1e61e3032b6c. 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/QZMEM2479761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e1ace1a30b3c37552151657738c4018e57081aaebcc317e0996b5563a0e6d4. 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/QZTB82436464.
Assurance (Jaco Session 8) [feat. Huey Supreme]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84f4463e7d4264049f8f0f4e091458005a43d16219b75a0a2fe66f7ef746f4c. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/QZANL1711021.
Mahogany Skies (Jaco Session 4) [feat. Brandon Jhon & Danielle Summons]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa35f376efddc80d9e635b6c6b3e87665b09af2f851c9304363011e2c59b5fb. 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/QZANL1711022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1aa6742532f783b9375a7a796fea09b5d18c309eb9a6d08b76fbcd022a7c691. 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/QZTB32399374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5623111280ead93b29eca88168d2d258f94be0fbd1efa72f0f12c2e1af0147dc. 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/QZVEM2350584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844d5f26b214247d757915d9c31dc2854a4938de8e2fd1cd412405a0cae59c22. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZK6J2338046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc019b58c5e343272c90bafe188ec1a6391cfb7bc3554638a5a4a9ef54cdf2ba4. 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/QZK6J2335718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675d401a09cb23d022ad433d433cab2e80db00b1a8834a08d107592c17b4a009. 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/QZK6N2346430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc019b58c5e343272c90bafe188ec1a6391cfb7bc3554638a5a4a9ef54cdf2ba4. 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/QZK6J2335718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675d401a09cb23d022ad433d433cab2e80db00b1a8834a08d107592c17b4a009. 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/QZK6N2346430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34aa96c2b7ae7c0b913076e1c8852e9aa5986bf683ed8e62b0e481239460a0e. 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/QZAKB2170469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16c54b7658ec3980919c91982f7827e4c4e0c5ab7add1dae9822a419bfa0059. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZAKB2170380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45165dcab13e69b416aefec4304804b3134c679c43ecb69bbee65e40ab0447b4. 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/QZMEP2160769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53965bd2666c778ed70460d388f2b0a3ab7babf02e7ad551cafc951628b6f05b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6K2019588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d53c5f90aaab1b251341f9bde7c638517220e7ae5e64d88507b16a27a2e366a. 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/QZFZ42014735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85eb19d809788ecaa2b721ddd4af0506f2b5d43604c5cec765113f20fe749e4a. 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/QZDA42019186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9f6cb8692c7c0a34d90a04047b05aed9ba02e6a93067a3872602d302ccd44b. 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/QZDA42019187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1abe72cf9b3cad5a6070a5d797cd2c3eecf806eb037fad1d8d4d317727bb41. 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/QZFYX2094676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7edf4fb06658fa9d0d081310e7bc245e52a9a354b2751ac00f525af462488a. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZDA42019188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4285e33a6a04133872fc69a9d55a3c571fe63fd44885b276469448b42b8315. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZDA42019189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d53c5f90aaab1b251341f9bde7c638517220e7ae5e64d88507b16a27a2e366a. 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/QZFZ42014735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1abe72cf9b3cad5a6070a5d797cd2c3eecf806eb037fad1d8d4d317727bb41. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFYX2094676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d10b6eef8660972a1810d5eaed57c7784891f2fa8f4b9b6b0be71caadbe44d. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZHN51977667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2914a47c784573e9c63c63407f77a130e6de420e2416699c1daf633d33c2b61. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZFYZ2474709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc17211cb1afc0f1dac54d8977589dbe86871fa7e0e61b76e3f05bbebc312ac9. 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/QZFZ22148590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f10d35fe95ea8163ab66aa9a165c78a4eef7b2593560b7a6f4619ba85c6fb8. 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/GBKPL2144785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f10d35fe95ea8163ab66aa9a165c78a4eef7b2593560b7a6f4619ba85c6fb8. 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/GBKPL2144785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2116bef5569efc3725974d56daf06e63a806fe79ea2dd4c66351a5d3920fd4f. 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/GBKPL2144787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef201b35c3e8318b8712569feff1bed09c717c2374675f7e23bf3a479fb35baf. 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/QZWFP2391322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x470f7b0a39f22d5cd4cd6365bdcb5a4ac49e96aa156013483271eba9d49db25d. 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/QZWFG2441532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3673c8cef770f8f45aefc0e85d3a78459307ed400d293949ef2f9a5bd8b62f0e. 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/QZWFG2441535.