Helena Hubertina Johanna "Lenny" Kuhr (born 22 February 1950) is a Dutch singer-songwriter. Career alt=|thumb|303x303px|Lenny Kuhr at the Nationaal Songfestival in 1969 200px|thumb|Lenny Kuhr's 1969
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 0x8d1e6cb71e0d687fb381d732a0931eddf448fc4a39a8472a19f11d2f766d4b51. 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/ef5d4356-e9e1-49ca-9937-68ccac148593.json and https://artists.proofprofile.net/proofs/artist/ef5d4356-e9e1-49ca-9937-68ccac148593.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 0x8ab4214c406b8469bbc611ea16e48f0228663965c732ee4227e3be5d99eeac72. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/NLA240000157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fde215fd44f52d3691bd34102baf14105ed95da25d493a91cf4dc80316f7cf. 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/NLQ741600088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ebc3847bfff9adde9f4f2da101d8b752805dc623de8e106b52250195b0c827. 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/NLQ741000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae28838e34146ff4dee65d134b9004e60db7dbe22cbd98cbe316dbbd1d5c2ed9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLB602100340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f775a6cd3887c74b479b313d0d09f3d36717ca34f76c5c11aa1b5ac3f291fa. 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/NLP972300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4bfe3349ef7d733e8f987ec07da3bc06dcde481fdb0862d99495bf20e2f908. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/NLQ742500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629a2e6d5b7d87cb78f103af6877562d292a2afef3c16afe4f65a301055acfb2. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/NLQ742500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd01f5497c02db4aa16e93b2e452d0e61868940bd0c0a84e1c8eaf76ddf215a. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/NLQ742500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71afbbfd80612d38a0cfa131a4108f1de349088af9f9aff5daabae178103a43. 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/NLSU32000054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60825281eedc2d1e538492082047d4a1ed0504d24863b6b8727c1ba3ee35edc5. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/NLSU32000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297e661e4b7ddd442202c32fc7a4736286a11de63db381dd455317c6bd6d830d. 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/NLA240000156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c7accea06298aea849de872929a0d241de8c1bb06f0dbf9c1e7bd95f50e148. 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/BEJ011000282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5c52c6024ab01a9844197a65a9bde88efa64ba44258fc44d869660ab63bc37. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/NLA306900014.