Kate Boy are a Swedish synth-pop duo from Stockholm. The group was founded by Kate Akhurst, from Australia, and Markus Dextegen, from Sweden, together with former Swedish members Hampus Nordgren Hemli
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 0xe1fb1269b2ad63f980ff6a996e0c7e989fd218ad2f73f8e9af86abd8a0becd16. 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/3b5bbb80-f7d8-45ce-91f3-5d148be40817.json and https://artists.proofprofile.net/proofs/artist/3b5bbb80-f7d8-45ce-91f3-5d148be40817.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 0x2dbd0f55f1e55e4692e29318b46ba91537260fb8e06531a5b99b3ebb6d68e028. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBUM71503870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426ade970d86d0e6c91a0c3898863b9b1f8a0f1f2d8018c4547474652f6110e4. 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/US53Q1200048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3afd52a5beff2c9b22f6d7a54956d68dac668be9263f51f6bb1c40b5a3df6da. 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/GBUM71403391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3591f0f63e569918f32c0a55637f44da7bd22b14706a2b3ee325cb41b824714e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBUM71403389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a69d016d9c7423c189585f36c91d7a02245cd6ade5247474736d2889f250e7e. 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/GBUM71403393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4853b8dc536d611dd9f80538e24eb7c0cdc69c9ed14c1f011202a3c3ee87c4ce. 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/GBUM71500551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b0f9338812a455823710d3e55de5a5e9e0174777b3201ff1ddcc74c237fbe0. 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/GBUM71405426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956df4c06114d943f221a693da034e37ced12d67eaa671290f332d3d322fc320. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBUM71403386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2e4be017ed67bce86d187ebe4008f0269e626c8621cfeef051f71b64f25d6f. 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/US53Q1200063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af8d595c467c9a1add6d7e128d21813a38c42f7da43dca842772eb78211e4fb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBUM71404653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ea5425c7cd02eb3c2f3a3bfca6dd80064572702448b954eff97d347d73abcc. 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/GBUM71405467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8558ce1c5d9eb75a4e40ecd0dc57468305b47c7a18d9b482e0ea470b9134ce. 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/GBUM71505603.
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 0xcae014a711ce07b8a51e216c449d0f4f1ab8615c07a3ee309b56a0b18d120e4c. 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/GBUM71403388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0daebaa21c13b7e8de225fb3955e86b1eea12da77888271e8baad62053d6ce6a. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/GBKPL1809822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0121d3af7c22eb7726a16fd41d709a67d3eb2df9790f0edb292dd7d5b4a9657. 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/GBUM71308653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1775f05685a2330d72c05c87a470996f0263ab33b4fcc3bc26af5741fd64948c. 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/USUG11700695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd82da41cee5d0df332a781de3491fb4180fae6033464682194f131b77a82181. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/AUWA02000007.