JYJ (formerly known as Junsu/Jejung/Yuchun in Japan) was a South Korean boy band formed in 2010 by Kim Junsu, Kim Jae-joong, and Park Yoo-chun, the three former members of TVXQ. Their group name is ta
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 0xac6628c61d517efb1d78c01a151516824dbf341c910db5a90f7d0652c24af871. 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/6927b74b-0f04-43fa-a019-742620470b92.json and https://artists.proofprofile.net/proofs/artist/6927b74b-0f04-43fa-a019-742620470b92.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 0xcae04299aabfbb948e56f267657639029f53f152c58271e852c303d06a136ed8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/KRA340929726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f412c2884d4eb32b9bb6dbe7bf27bc9d7a1c0bcbfd900661debf7576d9462e. 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/KRA340929810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf53a7fca56707b78c01c4a326b12794924aa1db6700a12a1d9b8676bd2c340b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/KRA340929811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b579f33d8f75cee915df103e6819d3ca68bbe6a8f0674e52cd773c788080a2e. 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/KRA341104620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29a1be6c528b9d236c011fe67ea932c74ccee8ff8687840a9739071ce709e83. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/KRA341104629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c1a7e29e7da07dda74115bda899984a87a9100ec93afc09abcb934e93a831e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/KRA341104630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaecbcd761cec1c97a31850b473c9ae1d46584568aa79cf6341539e54534ad768. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/KRA341104621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca4d81b2bccb8920a4ed8894c7b50750939a5beef5ea430ee2b864e5e4a4df9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/KRA341104622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16e58bf713e102f1503a2fd062d059809f15cc29945647563b760d51c016e61. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/KRA341104623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7a8319a5bf9b5e705ca5e22f21c5c8bf9cc8b43d6974fd29a3836e349a0132. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/KRA341104624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bf1d191003857c2d8b6c53fc0ac0a380ded90ce5afcd9ff26123cf7ce49f4e. 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/KRA341104625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa898e976870efe61ed5061a30d8489eb3e8a1dc20a9fff0f3742e53253d1b11f. 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/KRA341104626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857997291eacee1b43ae02ca1cf7c0b332a18affda894e1a9e96878a8635bfa0. 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/KRA341104628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf456a27f94e4fbd245b29a48bb21e5c076d4ea2b57973a044e6183b35070f6e5. 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/QZF452021961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe666c10a0ce88abaa9b27c22ce5cc202f4b0bfd4a150dafe939477f1842945c9. 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/QZF452021962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8419f3491355d7eae524e1b1c8588f80e070b59a2337aaa72247e46d354e9e3. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZF452021965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfcafc2945f5c0180a8a3185e7a9a3b43ae29de5f2a27d2e8273b86ba4f7125c. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZF452021966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb67ae72468054826d5a51c45e2ecc34818ff4b26352465036f6e108e4758bf9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZF452021970.