Blackswan (; stylized in all caps) is a South Korean multinational girl group formed by DR Music. The group consists of Fatou, Gabi, Sriya and NVee, and is the final lineup of Blackswan, as confirmed
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 0xff8e2786d93ade48ce9139ae145b402e5c91e5c1f55055ce14dcc5090f3cfc3e. 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/3842e391-f9c9-47c6-8e8d-8ebf92b4d956.json and https://artists.proofprofile.net/proofs/artist/3842e391-f9c9-47c6-8e8d-8ebf92b4d956.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 0x97bf9ca5a6f1e7db6b9523c56ac1ed3a008458097685c372d905afcfed0d3769. 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/QZEKE2004857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56265326a3e848274c85b6b50c2edf8673c377691c2ee090235d652c2b5505b9. 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/QZEKE2004858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9588ea4a5f5bf50ff38f1eb6fc6e0d32ac839f9632278215148b5e50050c092. 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/QZEKE2004859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2142db7b76f5aa3e96fd0b40a7575f42accfbca0973dde66a4db2dec86446131. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZEKE2004863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96b569ab9e02610bbdf9c4cb5be524aa1f6cfc835aedbb242f7455951e70143. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZEKE2004866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7bdea8e8da3c1ae4ec5f4b680b65afbe55ac1d756f3d10c6d26607c674c5ad. 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/QZEKE2004867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc66cf919bec45dd293305462e8edba21bd433fb8e40b8a758bb6c82925fe6e. 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/QZEKE2004868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47dab4d276ef475c26753a5e4f560f8c0c1ec5227abd11e583431a7628e28f2. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZEKE2004869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6567052295bdc7c426c756f05bf5aab65a599c96a97d3a5a98fffed77d479b4. 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/QZEKE2004870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ff0e6b3966a84681ea41265905563275770a515d24bc5f38e9dc48fb40dd28. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZEKE2004860.
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 0x6d68ce7063434cc8addf135fe3d27a11aba6b5056f491c5f3a84ac4513a1cdf0. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZEKE2004864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163b4def44d966b484f1f61cd8f76e6206e2da39fb1dd6b4592080c863c3e72c. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZEKE2004861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3a54c4feee726cf74f1b546cdd8acd9fe4cb6b33c1c152de9d2d0fd7cba4f0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZEKE2004862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b178650ea834a1fc7f20f9606973931d25e1aa4bf91a5346bc858e03ae598d. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZEKE2004865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88ced7efb7267849504d95bbeb05c7e289e9e5439560e1bbbf65d04b0379718. 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/QGNCB2306770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492a636200da17ec4e3761d3fb7cf1329f3c0d04c4a5062412041941e4b9e930. 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/QGNCB2306771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ba3bacd309e0b148f110e29fa3986c46619dd09d1fe3803330c04bb1fe734d. 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/QGNCB2306772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a727350acb566f69fee6c771682bc13ca4c84a2eca7250c3f4591ad2b88660a. 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/QZNCB2148686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e58a16296a4538ec20e13218118ae6052547dda72ededd959e7979d00c7ab8. 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/QZNCB2148687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c66f0d6e192b0ac0824d584daf7c860c4525cefffe001bb9ec75ec70bd6142. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZNCB2148689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4193c0c46b97d58df3f544c6b4dfc96b4651ed650479c1ee284ab6eee803591. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZNCB2148688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e5e201ecebe2c4e74225ad9493adb91b2e766a99f85cef34a447bc0e5eb2c9. 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/QZNCB2170382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7968a83ad15555499650fd073db4282bacc61820ab63930701c2edcad8d93b. 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/QZNCB2170383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6765f3f3f83c5bf4aff5898478796418f1368c45d160c9c5d278e31b33b7ba6. 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/QZNCB2170384.