Leoni Jansen (born 18 September 1955) is a Dutch singer who performs American folk music and Celtic music. She is well known for her work in television during the 1980s."The magic sound of Leoni Janse
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8bc1d50006e5be631e63749868169a7e95ec8d80e3d1232ce95dd7b48014ce. Chain 2 (Bitcoin): anchored in block 953621 (2026-06-14T09:42:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1df69f1a-16d9-49d0-80c4-f56ec07949f6.json and https://artists.proofprofile.net/proofs/artist/1df69f1a-16d9-49d0-80c4-f56ec07949f6.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13faba1752ac16a4846c120cb8381cbddc3e56030fb9a324a4d14456ad6d8e44. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLZ881000046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ff58f5442bdcdc7468421b8968a130a7a889100d91ce7e17f10fa126302dc6. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/NL2SA1900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836641e7c62d6103dd4c48fe4d88e58cf9b236d69f0744222421d17986aec600. 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/NL2SA1900014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd203f7e10cc7fc1f16f02449861251d5775fda0f76d6f329910545936d881368. 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/NL2SA1900018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ceaa0ed390c8c78c86aa195d9f6ed272e01268c2bd7e87ec774049c9093be3e. 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/NL2SA2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d783a597e3e3d82ec8850dae4c998a26da12b56d4996dfaeca1202a88c8a9e9. 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/NL2SA2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b67776e853f0a94b2e9d573b8d85ea62c51caf6a6c495aa9ceb478955f6f5a. 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/NL2SA2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de106b4a0eed061128bb4bcfe9c11241fa8ed8a76f4d29802686eb82c771bf5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NL2SA2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06dfd6f10230264933a57e367c8ee1a94a8f8ba9ea2420789c6257c4d00b7342. 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/NL2SA2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c3f16d28288d71bb73671c5bd863800387e92a70c6cbcb2e341250b9223837. 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/NL2SA2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb070b1d610f2ff60ee82434fb1668d7ca8e70f09e821f97ad401a4644d6b1ab1. 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/NL2SA2300001.
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 0xe9105c7b5756ffb9fb6638931e1cf6484da0dbf4a73745ee041ea12409d8a1bc. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/NL2SA2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe911011ac95a75b6da4da0639a5efaf5d8c9f5f5d522fdbde0f45bc1c4b6eba7. 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/NL2SA2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d7723f834cc7f0fb58fae0e094e0c79ddb1dce936b78fd5b09429f4bf3612b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NL2SA2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f0fad88721e3749afa3375ecc4dc65d704f34ca591587167409666a9910808. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NL2SA2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cbe7cdbdff8f315c0256547cad1a6bb830db3a4f925612feb120198f41bc44c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NL2SA2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6a6ae7e2dd94c317e54332814598179b09c6185204d3eb0df335ce777b2d62. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NL2SA2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934fb09d3e640bbdb8bcf7e819c2ba11c7c8d9fd36cca3c44f8547e14162900e. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZTB72294610.