Yoo Si-ah (; born Yoo Yeon-joo on September 17, 1995), known professionally as YooA (), is a South Korean singer and actress. She is a member of the girl group Oh My Girl under WM Entertainment. She m
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 0x8b746059f323195e779659284ff40f49762a550f10c6775d8acc21bde225110a. 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/f72bd469-78f5-4be7-a29e-fe5828a7afe9.json and https://artists.proofprofile.net/proofs/artist/f72bd469-78f5-4be7-a29e-fe5828a7afe9.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 0x634e536c6f81f03454a9c33e097f825356f45b36019d1e1ca4b97ffe9d280bb7. 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/KRA382401621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3daccf593ee06e9806944d66812550e197b92517935aeed41a8fb9e03192bb6b. 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/KRA382401622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37eecb7da5c9f1c888c2dcaa799a3fc8fd0c5eb7515200890e4ef8ab8b4b604c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/KRA382401623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d7e733eac71a2d3f94017408195e0c2f4e98a0cda6502ef144f6519c84ded3. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/KRB472301824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a909a33739cc17cb5f8fa35d591ade3414dba217c250ed744e926b51d48164b. 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/KRB462201355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916907547d98a91adc2a22f7e29e106095b8a4410b12780a4fc3fc9389370087. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/KRB462201356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe941f609517d5941b4f182558d470183e36fc81bfa9867672f6261da9f90fcdf. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/KRB462201358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d8e97d827ce529a8e7f36e631775040744dc128ac99905a457a930970de85e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/KRB462201357.
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
TALE OF THE NINE TAILED (Original Television Soundtrack), Pt. 7
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4ead6a0dee01a760f128fe0d579a409566afd0fb90b25cdbf6a83634ade15b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/KRA492001302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c74ceb78157f11d4e20b5394d38785e15e3f96a9f884a2e6859f44346637d4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/KRA492001303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf01e8279b3cfd0b65bc1544cbf81f1e07991b461f84aece9ba1b205e58fc9fc. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QZ8BZ2000440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51d01802d4886f702186b10f80d7616ebcc7bbda5f7fbbbc7997f42cdf3d0fa. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/KRB462000767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0cbcaf376d396e91d871c4b7a79931ac4cad18973c52b3ea10856324eb87ab. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/KRB462000768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b52f3d15831e4e6559aaa1f2ab44cebd3ff6e46ca4bd1b3caee9d1284f12dd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/KRB462000769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4572a024717fcf44e34fb34acdb08dd81fc5c88dfbde4ac16693ed8aa20b5fe3. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-21T22:42:08Z), 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/KRB462000770.
Say It To Me (KARTRIDER X LINE FRIENDS [Original Game Soundtrack], Pt. 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5085c01c8feb9e3ec5e58ebda033fdc2c94419600ebecd717fb6b4ffa0dd67e0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/KRF652100152.