Kim Ji-woo (, born October 20, 1999), known professionally as Chuu (), is a South Korean singer and actress. She is a former member of the South Korean girl group Loona and its sub-unit, yyxy. Early
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 0xd0c409c365b6fb13c7eab08c45cd7f66360e1f6f9a01c5793ad0fd5e14671535. 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/f15b4ace-c29c-4fe1-895b-0322596fd622.json and https://artists.proofprofile.net/proofs/artist/f15b4ace-c29c-4fe1-895b-0322596fd622.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 0x9807003933ce7b6ede7a6bfd7629aa3a4268857b4476690f505d30e43e9d3028. 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/KRB472400268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e7a9ea53f5634e5825ef58683cfde824841a48d22dddf0c95c2e140a53a727. 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/KRB472400267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b32302e0680596f6546368a4595b431350df1753d569cef817efc87c3163303. 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/KRA252302534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8689250883d1ebe2a208cf1f487e17fcbb029782ece699e6db2f85ef8514135e. 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/KRB472302236.
[THE SEASONS VolⅡ. 10] <AKMU's Long day Long night> ReːWake x CHUU
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9a8cc77541c3090d564b4afee5b2292f9f5446ffbe2bc46bf3bfaaa2868d08. 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/KRA382321842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0abbda17c3043c712515c53e4ecaaca1cf939a2c9ae615110c26e7dc2d9c30d9. 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/KRB472301802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e22bdd409c9c81372290bb84309ef9a77dcbd1733ab32b098453d4dc1008313. 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/KRB472301803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fe1267e075f1906f86a062d67d12770370ad3c4b0922537aeda08684f3adb7. 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/KRB472301804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8ba3085293df4147a0b510ad31e663cd851643242a76e9c5ff82e1627560bc. 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/KRB472301805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15313460d0a7c12099c1c405c9993231569a0e19f35452374cea8ee28689163. 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/KRB472301806.
Our Night is more beautiful than your Day
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ae12a79041b7ab8823575772e206e821adb5a350cf8dc7ebdb2af075231bde. 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/KRA252301482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6e362eb4d1b89b56dba5be40885093728ebc78c184b8f0f0af9eedf552abf0. 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/KRMIM2333684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6033694d96ec65165fa3ec136739b720cb1dcf778c431d8016ce36d8c4315b5. 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/KRA382207955.
Life reset re-debut show - A star is reborn [episode 3]
Daily JoJo (Webtoon Original Soundtrack) Pt.1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7587922de1157ee8646dcb2541e1acc9366c2e8d018a2d00deb4c4c661cef390. 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/KRA382207131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8afeb5027e1ce8e9b707f5152f96e9e16fa5b282177a846b163059e9c79ce969. 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/KRMIM2237172.
World is One 2021 (Feat. Eric Bellinger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414020c0c222c7cc0cdde57aaa57e0d1626f798dc4ebdcd6b6e2228f1b37c274. 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/KRF632103974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3494b750925c53d9b4e384e6118d492cee86a45e66a39b6c36314543953cac8b. 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/QZEKE2031938.
Fling at Convenience Store (Original Television Soundtrack) Pt. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7272b2e031f62dfda7c55b429dadcb5a6d993639f81356790460e17e070868. 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/KRMIM2104453.
INTO THE RING (Original Television Soundtrack) Pt. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70290406e399bffaefc0ee04f001cad15ed741670022302c85bfa8223a686c0e. 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/KRF262000007.