Cha Se-jeong (), also known as his one-man band Epitone Project (), is a South Korean composer and singer. As the sole member, he composes and performs his own songs while also collaborating with vari
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 0x4ea2eb4297006f0c570f024629c2926c5ed8753c8e0873c297e0825c0d226b5b. 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/3dd88e35-1e4b-4c63-ae6d-cf06a05520c6.json and https://artists.proofprofile.net/proofs/artist/3dd88e35-1e4b-4c63-ae6d-cf06a05520c6.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 0x96e85aa137d2ea4bbaaaa63fcbce8cdf8314fa61a384758a453410b577d9c5eb. 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/KRA340920469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064babeb4dc843437f918c3a41afbf4d5ef922cfc11cc230788208e9809cdc23. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:30:53Z), 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/KRA340925181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e56356e88ea36605093a9da3d6ad5dac907941d1e003a2912e9aa030b637ce. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T00:00:28Z), 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/KRA340925186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf882f94623df0ad1bdfaf18a196885d14a04910fcd3784fb2a081f33260ef2c7. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/KRA340926773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb10a88d258c6e8aed9d6fdcca6df5d1421102636cd6fdab113f95ca314e720d. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/KRA340926777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93332a21a94630c95714189f63699e98c9aa48172e363aad47f5d0dd8fe2c9be. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/KRA340926778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4b7e568ebc8136df506f8cc6600168f1c8c8c1dd8add6d3af5599567bcbbcf. 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/KRA341213817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a216748d2ebce4dfb758b5b4ce4565a6329ada6caf4405729ec7bf0cb85312. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/KRA341205947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc533f0a10440920e17111ec9f39c49da4d9a96c8c2e388ad18effeca94751f32. 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/KRA341205954.
열여덟, 열아홉 (Original Television Soundtrack) : 봄날, 벚꽃 그리고 너
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6530b5f32011053c99f1edfc7c52f08059a339e919f94713b1776da9ab910335. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/KRA341204382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86facd5ec71ce5c2315c0da61202c28973f602da7fd82d689a43107fed793a5d. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/KRA341204384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68959c834d43833f6b94c37698a6b6feec44223c9ef559cfe059b374573ffff. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/KRA341204389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ec4c503845e4a627a0cfa31c2dad0bc27f345b91b643fcfe49ae214aba7cff. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-16T01:59:04Z), 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/KRA341204393.
Casker & Fanny Fink Curated Ten Years After - 잡음
Casker & Fanny Fink Curated Ten Years After : Pastel Music 10th Anniversary
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14e77e2db7672290a1d9441fb2f9734aa68172b0e976b8162bb9c6ee1275667. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/KRA341445491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626792203bdbffe43a4b2aab8f95134b967be6e8514283f7a3e49532b64cf112. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:04:20Z), 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/KRA341445494.
divorcelaywer (Original Television Soundtrack), Pt.3
이혼변호사는 연애중 (Original Television Soundtrack), Pt. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d97c87b1b16bccd2f093efde7807c84c5908f10ce19408b993ea4c81f7ec254. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/KRA381801457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20719532aafe9f91d95d04cfb8dbf1907d4d060541d9a6892bd25dcedb15133e. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/KRA381801458.
Love, that suffocating moment : sketchbook
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e5a7eccd9ecf430151ede1f898c4285d0419604ca38a568ccc4363b831b0bb. 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/KRA381904115.
Extraordinary You Pt.4 (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a49f7d2b473e0450e8f55beaacad7f04884fde22746ba1a06abe7a68d85f9d. 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/QZEKE1918912.
도도솔솔라라솔 (Original Television Soundtrack) Pt. 8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61af28a6f482133fa1fc96443330cf4fff1190a0ed8a807948d949425d733d18. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/KRA382204881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5a6a81d34e4c4fc016555c803e28ae0d385dc9eb6a85912ca747a6740b3042. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:13:53Z), 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/KRA382204882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa285e4ada6d01b93b1b22b525ad87516895c346d059947636ee96bfbe21c8074. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/KRA382204883.