BoyNextDoor (; stylized in all caps) is a South Korean boy band formed by KOZ Entertainment in 2023. The group consists of six members: Sungho, Riwoo, Myung Jaehyun, Taesan, Leehan, and Woonhak. Chara
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 0x1989af92d28e017a5b0f4229b9287f93b61d668fb175183800134af7e064ef2a. 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/34d20292-ca8c-46c5-af96-104e62a66fb7.json and https://artists.proofprofile.net/proofs/artist/34d20292-ca8c-46c5-af96-104e62a66fb7.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 0x1902336d1b3e6ab4a43ac4f08ba39988d4ac7ea4cfa80a48373e229f7af98548. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2409358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397d8856fbe6dfa108f5f4916d5fa014b8dbe61b7bc4ae31b10455c9f3149b76. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2409359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099ef6f5c5bfdbe871af9ad8f6995ddd0ad5e253c334cdd412bf9100d072d93b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2409360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384fc5b6382ce957b0e3a27ab999a46d8e1c0346cc457ad53672d77f410f5502. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2409361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a057f01e1403e048ffe60e4a441d03b47f6d5be8d8cd80b65d8e4ab4574319. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2409362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f4d115975f233e714c2271305671bc75901595bcef7912d03d1a4336872d1a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2409363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f5c5dbf4f172a467b2e40d1edc326341e9795acaa9e16a542f34030cff3499. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2409364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5467b7ab9fbac95e76fd20bba389bd841d19a907814f3f2454295c1fc7d3739. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/KRNAR2354384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e2b2a411854e721ce185fad798a953b3dbf977cc0fb82cd298ffb869048ccd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/KRNAR2354385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9339152f1aaef8ed21a22644c7198a2c912be813f69978cffdc4809e01ae77. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2310715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f69ef2073f7f0ad7c4112672ffa6d80e1a8789c7be28c68939b09bfb7dea06. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2310716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b798fdd90ebe943bb37964e5a73b6e03efa373f5f33a850e2e171b51f1fbcbf. 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/USA2P2310717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52131a853a4c9b2a3a7f4b7f4281dbebd892375edb6b2d5db49b7d28e458afdd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2340654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03ebcc3686b4f439e254a7898503345c3c415040a9990f13c7e464a45c842c0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2340655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe849343362dd123eafc81253099f601eda8ab23a89c5ddbc67adeb72f578b471. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2340656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b798fdd90ebe943bb37964e5a73b6e03efa373f5f33a850e2e171b51f1fbcbf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2310717.