Klass is a Germanic surname. Notable people with the surname include: Alisha Klass (born 1972), American pornographic actress Christa Klaß / Christa Klass (born 1951), German politician Craig Klas
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 0xe5792fad6e175c85c98b9bc9db3963795d894c59df828806b38c6a69228634e9. 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/25fe0542-cc2a-419c-918b-15f5ee565cb7.json and https://artists.proofprofile.net/proofs/artist/25fe0542-cc2a-419c-918b-15f5ee565cb7.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 0x8dc4766927b40298f86559ba7eaf0d97511f43dc38e37041a60e8060fabb9a53. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/FR6V81760810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4f365a4311526b06e3a8c405deb1df327e118a5f6f1d084bf1a55139281026. 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/USCGJ1639730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecce6b55ffdea49657074e28665b05b20f433a52ab2981fcf65d6b8bb70a53a2. 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/USCGJ1639734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9b9c15d9b231092f8f373fe36cf0194d5db452b27d6120fb51f27042e628fa. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/USCGJ1639736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfa3060f6c65387c9e32c0cfcaabf205fa9a0df9f77e658cdaa3651e90bf20e. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USCGJ1639738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca10f627c2a06a33c03f3d12bb11ce22ee468b9ba11998c1113fef121ebb471. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USCGJ1639739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5284d54db0f7438a36338e758993f30d4f5de03bb439651c5c5330bf027ce824. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USHM21704938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a99dc00a0a7e29f52d935d2604885fdae18fcb683ea907166c50b37e8fecc04. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USHM21704939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c73041fa617e7c3508eb3bc69acdb95ee6af11cc9ce1c014ba50b659edf80a. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/USHM21704940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf890839b7c47660db8c8cfaac358f3802a520822020d12183c59c4beab524284. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USHM21704941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6e6a02aa741dce9051af6b5f1d2ead19cbbb191678f766cc6f3d55fdeabac9. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USHM21704942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5a655b788c296436bdbcdf40134563b1067e65e82767defb1d12e0315e3307. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USHM21704943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d446689add7d424011e2e5dab65410bd9bb86647616a4bc184a5903af33367. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USDY41887009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3af4560ce50596204e86b96dc4d2608944076089393145a4162ed0bcfcff92. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USDY41997311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948ff135fad6ee437d3247e787fc6eaa9ca5c72c8a846586ce65b7d71314cebb. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USDY41997313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb422d200571447ec81dbd0920ad43074e7e209670fefdf96c81af9c1036a66a. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/USDY41997315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b708c2ec29070c6f87f6a6a3fefd92ae3d80deecf39fe4225e7bb39cedec8f. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/USDY41997317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba53e13aeeefff97044143066f5028a377b20c1d38d1a759d791afd33f9f629a. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/USDY41997318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6b3878d1392f38ddf28b3fef137d0f5f5e0ae3e7a1aeb82a6c39943c680309. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/USJ3V2105706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52be784a8eb34e52fcbefe9de285814d236e09cd0aaebb18913a491aa246d542. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USJ3V2105707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7461e519d475eb6c7655781051e47823ae7cc5e54a0ce0cc1d83078a157703. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USJ3V2105708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d7b1a75e39c4ecbbaac61084f05848d68f701ed0183fcd021aee4e6ed918a9. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USJ3V2105709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5900c32e9684307c17f17933bdd1cc733c28c4d14793e660c7600947981228a3. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USJ3V2105710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce90dfc14b408e29cf420166c70b3393082c7f84e06854c7d3107cf66d435b34. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USJ3V2105711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692761eb6cfd0df94216d19ffa1b8cd80f3157abe554ea8eee3f7cd8fb08d42d. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/TCAHA2305917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8276bf94bc8a6430981144edc78a1e299131ce5d553bbb85ecf78269d506f7. 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/US92U1911236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0f8114752cb00114dd79ddaa8458ca3df20c639b9701e9c218ceea51c00055. 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/QZW9K2344723.