Broken Valentine () is a South Korean alternative rock band formed in 2002. The band's current lineup consists of bassist and leader Sunghwan, guitarist Jihwan, lead vocalist Kyungjun, lead guitarist
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 0xbf50f7d47290fe672b24960041759a4035f6eb5d4160be3ed0efccf296c178b3. 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/77e802af-f363-4035-8cc0-88f78d318bf7.json and https://artists.proofprofile.net/proofs/artist/77e802af-f363-4035-8cc0-88f78d318bf7.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 0x4bbf773406778396aed189be2574c2a394127234b71cd67135a7a2118b0d070b. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:18:18Z), 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/KRA341771701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabca75c876f45e0a45e9b2f1fc974e3f4383ff3ba3cd1064083f40b7abecb133. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T17:44:54Z), 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/KRA341774112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e4eabe77155e7423c701ef9e9de10395e8d46cd0eab7ae552d3af7ab25736b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/KRA341774114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95527c4e755248a82e16ef94130139f398797316c69f4581fbdde874cbafa274. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/KRA341774118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4ab41d2060abf091b8fef26718e73e2816883a3656226b021e2a850ddae189. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/KRA341774119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf01821317180bc08fd2decb6922673685bec8c46bca24d090d4ff9c5f674aa1. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/KSA012223022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933c7be20bcf74b5618bb3b1c54c70708c3a6d9de2c885ad7c1af38a4af190ac. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T02:11:22Z), 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/KSA012223024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27dbb16c3118e74c65f643c65b54ebcd28d8d3b1f6f4a6e38d760f5777c748c. 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/KSA012223027.
Is it love? 〈Sanullim's 50th anniversary collaboration album〉
Please Don't Fall - Kyungjoonless Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c99951dfa3790bb35f760eab9faf2b3b3086386628140df69d9c609ec45a99b. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/KSA012387957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4435d42aeab43dc6a464df28bd0a7f35d507f2ace4ce0d07a3d9a1bf8cc89af7. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:43:14Z), 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/KSA012394510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b67f5e339f87ef8bd735394e6479ffade23267e336ec450c9f3965f3fa69cb. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/KSA012394512.