Leroy Carr (March 27, 1904 or 1905 – April 29, 1935) was an American blues singer, songwriter and pianist who developed a laid-back, crooning technique and whose popularity and style influenced such 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 0x719c1e46087e92fa300deaf0bfda4b6925e12f5dc35abb2472a178ff9e77f45d. 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/34d64959-4384-4414-8970-17b5d035c552.json and https://artists.proofprofile.net/proofs/artist/34d64959-4384-4414-8970-17b5d035c552.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Blues Collective -Leroy Carr and Scrapper Blackwell
It's Just a Rag! The Mighty Piano of Leroy Carr
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 0x46195c6cba7e5300d7506ad332ea158bd5c58863a90608a2fb5e95c364270afc. 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/AUXN22104507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9069d11acb766bf06d9e1a89bc4e1c3dc69c82f9feecd912df398f5ee715c76a. 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/USSM10007186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100b917dddcddae8287856f920db03185db9bc653d50ef6720cb7f55e9e629ab. 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/USSM13400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0741d794482965e715721117a4cf5e826620fc17bd4a2124e8d4164f9f241fad. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ATW161500701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5966818a5fafd2233ca0c6478e45e95846b598425f545adb9d11427031df3be0. 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/USSM10403823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bda81bec41ffc19f7d5e50564b3f4dc3215dbb15f9e5e60a77924ba794b6090. 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/USSM10015010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561184dfebfb40b54143c8fb18af17bf993edb7e57a16862d054103006f6a23f. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USSM10403824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08438be4257ccff484d8223a6c6666dcb192f80a2e8ee2a3d87b70be337f915a. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/USSM10403825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbdf1ceb0fec321f26170e397887a46e1ecb881fe0b8edd026a9fd012004693f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USSM10403826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eabc1ec4b91307c5ea3b0e26843f839b4e3f2f31344e566f20a9292ad50b6ad. 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/USSM10403827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91a7e8331c41e9c7a4f9af6bb2698f86ac046816d130220c4c82daf41699ca3. 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/USSM10403828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f92e40a56a04523105930029febe9657f094ea706cf22839e2343f2c1339cd. 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/USSM10403829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9069d11acb766bf06d9e1a89bc4e1c3dc69c82f9feecd912df398f5ee715c76a. 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/USSM10007186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10ec017fe17819b8a5dbc0246c2a00042d40d34264710945d3f23d67822bac7. 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/USSM10015001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3541f461fd0b270a8a345cb6a87b79408d8cca49a9f13a9c5590a3ce006d0a0. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USSM10015002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aebb2684510ca5086920cd7de476548d72f7b901ae6e881eb82d5e400aeff15. 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/USSM10403772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfb9bb9c3ac1717cd95d4178a7cef55f5a56624eae6292626e7d3579e675a86. 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/USSM10403774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be1a5f9763b01b7dc69111b7bad87441771e5219ba3ddd1fb77846bcb51f39f. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USSM10403789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe620d3011e66b60f17bbe6f44665e29f70287dbaa067f17633334c70e109e5f3. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USSM10403777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47d0953b771f51adbd6fb3f89e2cefd20ff4004b644a9b9ddb95ff6a16f3eae. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USLIC0602082.
Volume 1: "How Long Has That Evening Train Been Gone", CD D
Volume 1: "How Long Has That Evening Train Been Gone", CD C
Volume 1: "How Long Has That Evening Train Been Gone", CD B
Volume 1: "How Long Has That Evening Train Been Gone", CD A
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c443146001f741fc1e97036c9e71f8a0068cbcb26a00f08f7ea0fcb0f28a0a. 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/USA560766628.
Jazz Figures / Leroy Carr (1928 - 1934), Volume 2
Jazz Figures / Leroy Carr (1928 - 1934), Volume 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf7943265159af1cf23da36e43110875c478701cad98f95e0b5c2f6110b4570. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USA560530217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061bc3f8220fe69e83cf097b929cd5b3381504025521fa7e052010cd07a535c5. Chain 2 (Bitcoin): anchored in block 957246 (2026-07-09T01:49:50Z), 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/USA560530223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef69d9bc4833dda0f7b8e5f7ac2b7c1c35f06cfd3d19762feb21c3ff08e27e24. 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/USA560530137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cac6632fb2ee3652099796aaa84c1860792e01e5066242fe17d05bf3f5b79a. 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/USA370511391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda073d3353cf820f122cbfcdcf5fd08e81e874d0de3929e6b183940ecaa2f22b. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USA370511401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd493529e2d81694b6c767df23b89d941a136316b84d37ec4c0d7830fb445cce. 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/USA370511364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d0bc65975b8ffdf8dc1878e967b05578ab482f02302167ec9c549334100f73. 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/DEXO52489482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2050ab9a1660e67794194659db4c6d070cd25a803e3b8b7422ed358053d1847a. 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/DEXO52489483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1002a88b68bbe117c933ae2751be09974d2e9cb74ab45480a39459840950965b. 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/DEXO52489484.
Essential Classics, Vol. 769: Leroy Carr
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da903136e9dd0c9649695bf31e7cd53c81a133d4b4f330d4235294538f11ef1. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/ES31E2502351.
The War: A Ken Burns Film - The Soundtrack
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1228c89f777f989e6919ec702ea9f57da089e4a2629ede39b37166a7de0e4b79. 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/USMC13864731.