Klein may refer to: People Klein (surname) Klein (musician) Klein Kubiak (born 1991), American football executive Places Klein, Montana, United States, a census-designated place Klein, Texas, United
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 0x5f9c5d1a05d4d434abcb6c10c12af731e0c91112b48bef58928ec546bcebb804. 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/f7e29f4f-e05e-401e-9e44-36c1baa4abbb.json and https://artists.proofprofile.net/proofs/artist/f7e29f4f-e05e-401e-9e44-36c1baa4abbb.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 0xb6f6d7bdb265efd2ce3db749286c43c5b6e89b7443c4a4fcb0b6724029c9ff4c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBCMQ1900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a0d1094e5d8685feb1cec09589447ad5cb4a54557e2b89d30fb341f5e53985. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GBCMQ1900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa153c43a0cd9bf3819b8010a513f7538c6dc51581b121c13059478756e5047c4. 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/NLE422102810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2453c541de9b4568c028d028df5aae80a887cf0bfa2e690d1aff54a29d7c19. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZS7J2420371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d5e2f0d0b1d82e9e9306acc3fe230ddfbe054a4aafa7e5dd127b5184568220. 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/QZS7J2387563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f28ca3c0bb9562a91a4e4e70fe39332c5d91b9042f489abcc2cad1cc7131452. 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/QZS7J2368848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84b033de248d3682fa48b73d0caa5aa5b68a9b3f37b25b69de67d6277cf8077. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZS7J2426078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472d847692cd342e45f291cbf1228a5742d10f625e5d3065d30a1b70781c0473. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZQAY2464331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276220fb7853d5de321f0079564942495e2aa9d25f0a4b0bebcd5302abac9396. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:36:39Z), 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/QZQAY2463692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60036f51be727b7bc7b4b374ba059d8d3c4d0a9fd5f1140918d305e9cb150041. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZQAY2420908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2453c541de9b4568c028d028df5aae80a887cf0bfa2e690d1aff54a29d7c19. 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/QZS7J2420371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056e4778c1c7afaaa9c0d96c1d26f2a5bd0fb246d5218a8edb43abf990b3d8bd. 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/NL8RL2502412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12680d0a4dbb857753f59b6b08e71790267312802477b2903c214653e6956ec3. 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/NL8RL2502413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c4d3159cda8bb1ec28521bdddbe8c82cb60cbc186f740e5541e2661a605ceb. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:17:27Z), 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/NL8RL2502414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ac46097f41554d68c271c7ff1ecd144b8e4eae263545105d5b26dbab993ba5. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T21:56:20Z), 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/NL8RL2502416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0ccb88eeabf205f5b08870b546c2c93ab8396c3d970199fa39cd5c520f93c4. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/NL8RL2502417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb948f61e509ebaeb248809eaf36ae4144adb595e94b20b8244c6abbd90245fd6. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NL8RL2502418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9292ee3e6d34f30bfe527b44d1b6098dc2d8dcd26f8b7fb355b1c0a5388964a2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NL8RL2502419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171c9326333846b8f7801ead9b5fe78dd776de185e5d3e32adf81961e2f2bfdd. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T13:00:13Z), 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/NL8RL2502420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a518ff32051bcd0d0fc6087b7fedb8114ab7877188b828792f6d2101df5be21. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NL8RL2502421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af75662537f898c9d4eabd74ea6da36626cf803f31add7b224a6d8233cb9f9e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM24S2206757.