Kim So-yeon (; born October 6, 1995), known by the stage name Kassy (), is a South Korean singer-songwriter. Since her debut in 2015, she has released five extended plays and numerous singles. In 2016
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 0x0b750fa5a7f8324b20b7cba9db24b6ab409381c17962edc7109bff094a2d94b6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1db08b55-fd9c-496d-8cd3-9c4ba163cb6a.json and https://artists.proofprofile.net/proofs/artist/1db08b55-fd9c-496d-8cd3-9c4ba163cb6a.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 0x824f4849f74e7ebd6b5b2450e8797690df68683c1b6c1bc77904533d786287ca. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/KRA381600416.
KBS2 Drama Fight For My Way OST Part.2 (Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ab508c7ecf45be709b85d9ccb850b5100b0812bc94ac115f19ce8e4c638218. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/KRRAR1708990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89ecd812ebc9fc223042b09f6d8f08d5ee7c41fbbfb3455858771e3a1f52b4a. 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/KRB471700941.
The Bride of Habaek 2017 (Original Tv Soundtrack) Part 3
The Bride of Habaek 2017 (Original Television Soundtrack), Pt. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88bc5066b751a44932a648fb58b6c793f88692e80bf4b85dae05549a0a62645a. 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/KRA381702030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a79f387935e4cce5cb821926787a173ddc32a812743014bf52a69025bf36f26. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/KRA381702685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745c140c60e1b68c1e169fd91048c6b3cee2f255625689f94d5594416912a7e8. 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/KRA381703071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c061a7136cf250b087fe0eadf369f2ac0997e1cebb429220d927b95ed17b2ee. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/KRA381705125.
기름진 멜로 (Original Television Soundtrack) Pt. 5
Let's Eat! 3 (Original Television Soundtrack), Pt. 7
Let′s Eat! 3 : Begins, Pt. 7 (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda5a8effa5642d74f5698c4c9de37f32c6e1e575cdcf7c63b1ce1e6d9e98bba. 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/KRA381801207.
Chocolate, Pt.6 (Original Television Soundtrack)
Chocolate, Pt. 6 (Original Television Soundtrack)
Chocolate,Pt.6(Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1039ff3510f4a6db2401d58b1017064bb6f17f3bfd34f107c44890ab2227f0c3. 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/KRA382006135.
START-UP (Original Television Soundtrack) Pt. 15
I will light your way (Prod. Cho Young Soo)
[Vol.99] You Hee yul's Sketchbook : 63th Voice 'Sketchbook X Kassy(Prod.Cho Young Soo)'
MY ROOMMATE IS A GUMIHO, Pt. 5 (Original Television Soundtrack)
MY ROOMMATE IS A GUMIHO (Original Television Soundtrack) Pt.5
Hometown Cha-Cha-Cha, Pt. 2 (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4bf9294add9faaec11079093a9aed71cf0cb564618848a4b9da1af96c99a14. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/KRA492100877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebe14ffff8d83a6f94f594639f249789a8ae8b8b83623665ff666e6501d36ac. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T10:58:20Z), 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/KRMIM2141370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3532f4a5e620e132da0f4c9c6a92e7306e857bc903c72cbe590c228c513fa28. 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/KRA382163426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd152c864a1d571713277818f63b11cde576f5dc12a3d884f53835b9a2f0d1937. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/KRA382205205.
Alchemy of Souls, Pt. 2 (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe898119852294faad89adc5c45a657146f9331b5873f15f36b41842daa14c755. 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/KRA382208729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4773f3c6c9dc208f083ed58fca9532c860236731d448f34112b0981616126cb9. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/KRA382320853.
Trip: playlist (Original Television Soundtrack), Pt.3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa650a5924532c268c92cd859318336959410e97b86c5ea838782c4e4522fc72d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/KRA382401516.
Reunion Counseling (Original Soundtrack), Pt.5
No Gain No Love, Pt. 2 (Original Soundtrack)
DNA Lover (Original Television Soundtrack) Pt. 6
The potato lab, Pt. 3 (Original Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d4e4e472c01af999363afb8e468cfae49896b7d660cc460d754e808b8116c3. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/KRA492500056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2338ba6fbabde38a47a3fceccee3786d3d37debcf9cdd946a044d105f5ccac. 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/KRNAR1701078.
START-UP (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeeca1cdec5c529d8bdc6c4d56122ec777ba6f77156723db5ccd88dc9c2465c8. 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/QZF452010943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcf47eb6df4ba98ed736704dfa55760068e6fa85b5c1cc499065163de8477ac. 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/KRA381800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54077da52cb6e64f8d148b3e036fa6929c85954b7d5860e05763dbb5a4f94f69. 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/QZF452010944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d104fcd4da0d946a6f0a40776ed1cd0d8135df37b4172a5b9147d22e51cd229. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/KRA382000000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350b5c424ecc8f55c3bc3e4e446beb917a77ca1861d74632e2c2356cc5531f21. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/KRB462200818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c3d6bd36490df60030a3a17e966bee54d999576e97141b877c15b78543ca7ce. 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/KRA382321649.
Alchemy of Souls (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7f0b3b579bb6bd509c826d8b967cf921f03827c7b0c4576d572b08483f9e91. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/KRA492200579.
Hometown Cha-Cha-Cha (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd359fa0059c550f584911aaeacd9bf2dfc5484528eb986ed99a72900c277f4c8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/KRA492100876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd402259920e3ab78679390d92a4e3d92402913c8b46c4a9c91c40eb0044528fd. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/KRA382000001.
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 0xabc81e570105177ffcc04b99d1b0049b8a28fa5ece064c3c7cd6679e51b91b59. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/KRA382321650.