Calvin Valentine Clarke (February 14, 1916 – December 15, 1995) was an American baseball right fielder in the Negro leagues. He played with the Washington Black Senators in 1938 and the Newark Eagles
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 0x21d13c1a8bdb782bd500d019cd5e07f96d278ee5b6648cd933c20d3d7670a967. Chain 2 (Bitcoin): anchored in block 954593 (2026-06-20T19:46:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be8b231a-1af3-444c-a5f1-622e3a7135bb.json and https://artists.proofprofile.net/proofs/artist/be8b231a-1af3-444c-a5f1-622e3a7135bb.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 0xc465964aea96987da9ef2475088ce5509626292f98aea7881e17665a53450f73. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/UKR3S1900049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b3741277d06a126b1957e221686fcc91781d4846018eba842d0708428da299. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBJAJ1800720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5217d9311dcf9a70e1bbbf702a4fa2d1fce1edef9f54d73219ed160868aff04d. 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/GBJAJ1800722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd548c7aced1eb531542f96be6406dc16d94cd8d7c7137a3cafd789e72dc5b9cf. 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/ITA061302769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2931738a34c7d4f6d360f095e1376121aaac1165ed53bc7c76a1d023a9cb11. 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/ITA061302771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0607807d324493caf25eed8ae95f8203d9b6f94ce6dcdf287ecf0c4456d2f2. 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/GXC7T2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab037a6af3360314f524e47d0ca48ae4ffdbf8a24a628bdfa773c81a4fe36b5f. 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/GXC7T2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684e74ba39d2657550fc3e3d6f160eba22b8ca10d8e14f79bfc143cba3a70b9f. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBK6Y2251171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118f5a4c297f01746d331a5eaa8f2028d212463017052394df48ab89b8cdf55d. 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/GBK6Y2251172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91774956094e9c580d5926ff2cfae63d9f71d2748847a8aff96b95bcdec6cc0. 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/GBK6Y2251173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec0b0caf0eb4bb41baf7e70f76828d49126a1a889350f451650678eaeceb832. 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/GBKQU2358035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbfe55d2e783e9ecff59698dc665f5d4712fcc438812019662de23c5fff5b2c1. 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/GBK6Y2259601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbb2527e7b942f75ccf53173ed910b51686398b8f5f9719a163496b7f24f87e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBK6Y2259602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2164b92c374181f9eb5e6f02ad8cbb10e8649093b09683b65692d45bcaa5c9e. 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/ITA061302361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50f2e8c242214c0dd296266b7bdd691ff8ae0f6a1bf8be0fbc213505b52f0f9. 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/ITA061302367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf493535f61787fd1256ae381813f3f3a4487e9b210e1890d37558101db49230d. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GBKQU2471435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96c26d3cdd86764853ed585e6b6722779195aed4ff68e2b8763c5a2df9e1dd6. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBKQU2471437.
Bamboleo One Year (Selected and Mixed by Neverdogs)