Hannah Junghwa van Loon (born ), known professionally as Tanukichan, is an American singer-songwriter based in San Francisco. Her debut album Sundays was released on July 13, 2018 via Company Records
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 0xc71d7a507aef5aaeb875294aec31f31fe0daf11dae529543e365221b98ace1d1. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8436b69e-ab04-4a1d-b572-69e3612330f5.json and https://artists.proofprofile.net/proofs/artist/8436b69e-ab04-4a1d-b572-69e3612330f5.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 0xfdc56c5195691d8e3ec0d5c2de28edecd354364cb26f6d3187a1a11979b95609. 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/US22N2331807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aabad745159a5a4ce922bb37d4a69761f7b86d4c1392a774c3a6f5ff02a20f8. 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/US22N2417603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d922101c68ba157ed19350580eec065e5fbcbf4ef33da5134783f78a5d96bb2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US22N2417601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6b0b78b205b36b87563fb6a58100a765416def3ce7ce92e4c89c8b8a95036e. 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/US22N2331802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47840bddec8a44becb7b06576796efabfe28ad5d7508f2fda633ae4bbb516fe7. 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/US22N2331805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf458d538a641241979547910cdd457b47961de0a40479d236227256b745acf61. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/US22N2331806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc56c5195691d8e3ec0d5c2de28edecd354364cb26f6d3187a1a11979b95609. 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/US22N2331807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cdc03b17af2b4d9aaa96cb5f5ff231be0d7343445069ba44de91bc349dfd9ac. 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/US22N2331808.