Sistar (; stylized in all caps) was a South Korean girl group formed in 2010 by Starship Entertainment. The group consisted of Hyolyn, Bora, Soyou and Dasom. They made their official debut with the so
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 0x1f6421acffd80cbf46de9bb5058a907a4e71d5679a531a269f92a6561d243584. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d511598-4a75-4f03-838d-0c1bd6f4b190.json and https://artists.proofprofile.net/proofs/artist/9d511598-4a75-4f03-838d-0c1bd6f4b190.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 0xe56a23afc8e6d62194005191fc75e9e76f8ef8d23ac1ebce5960c77accf2bcdf. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/KRA381000616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5058d1dda5a8e7671838eccd7d5724a672fcd43ebdcb1479a1c2e3c123a003df. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T02:13:24Z), 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/KRA381000818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd8e034dd314b27d880ee59848dfd6532e27a155a8bbe10869396fe4a689ee8. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/KRA381001051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd84cb8336d6b91ccfc1da472954ecc330a02988d4519f7ec162302f9b890977. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T04:37:29Z), 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/KRA381001896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa365cf5f341764fcf9eff38de87f6451203bf880949887bf9d838bfdc8f64282. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/KRA381001897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8f2d522a53f76ca40e53b89881ee46e48289838f908d33c38ecd6aec9e9c45. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:56:57Z), 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/KRA381001898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c3a27bfd004e5de8ddd4dbad1eaf50a83462efba5718265bfde8b2b760540e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/KRA381000820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d486c5acb6f8e3e332c63ee9786eb354c7bc2529dc857854bef50fcd77ee06. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/KRA381001052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d8ef8b7d4f8439eef13e3d5a0cf38b1f0ea5cd5c117fb9cea3d563ef7f11c4. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/KRA381000618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffd632ff1eb463f6f5d5b63fd251d98d02492d752d455c576d6edd8d0221595. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/KRA381002197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d9fb5ee42a8376e29ca57f4eb014d767ff42ee48cc48a2ec09141c110b86a6. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/KRA381200893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ae02f0528f379d2f527cb037d8403ebae81758a1bcdbc21e7ba8334a4bf327. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-16T00:06:08Z), 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/KRA381200897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0559537de38860ee5cfcbfdd3440003cbf56dfec3fd97dc4a9aa3475f3b19750. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/KRA381200899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae7e8b73736e5f6a9e710d883665934704a3ed3a1205f0a5b771d000cc999b2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/KRA381201106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fdb01f52254d5253e1724a40d28a9b57637702ec08cf27a861e01045109594. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/KRA381204547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32acb52a1a5bf7b81026c0ce7bcde2a702f25146f7ec067f9e13ed234ba532f. 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/KRA381204548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88047b2950ae428727a03d8007a244a260fc7e577b7f9cc071db245281205964. 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/KRA381204549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a68040cd4f40436dbfe26983a49a3f96a47c07600cb53176ee716cbebde311. 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/KRA381204550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8466c5775856379dbe457e6a71feeca3c86da90d4d5ea8b7b6fb7182e60fdd. 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/KRA381204551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28848a065e003b9008285153f175912851b40c6960d1e274e577f8ef59eb35a7. 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/KRA381204552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6b5c52ea9609b7be7b5289f4ef74841abe9fbbe53080e054eab63a11d786c4. 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/KRA381204553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec370baa2c0210bad0b7fb700741ddbc8d5740b6dd593bf375c4aea72a9c15a. 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/KRA381204554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbf6cd6324c7b4402dc49bd5844c9a9a609eec054d5f22e96a14b7c7bd56343. 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/KRA381204555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5926ffd8db93ac2bf773892d70f61e0464b2d1b15427fde4190a93294ab9976. 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/KRA381204556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8f6824cd6e588a22efb14fbc955ca52e05ddd4c226c0512621d6d4236937a7. 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/KRA381204557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55cc86ce478afb20049b8cc13ac0acbe46064d36b6be8ee1a91252110753763. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:19:35Z), 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/KRA381208510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dcb4b19288cfccfb71d97a0b1c459bd7504fde4ef0c5d6afeb6587f8c87439b. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/KRA381208780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56ebc913c7eda9dd1a02ca206795fc2880484c922cf1e5e4c35fb1018d63710. 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/KRA381210966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c07bb5427c432fa30761c6218a58da3d050ba636b11a8ba0a093c4593861bdf. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/KRA381210967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e51f88d27bc100eea7d62b6d13ce53dbf4df3a297c869a067012db2b10ac2fb. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T18:29:00Z), 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/KRA381210968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8452e00552e975b67467a7ffc4a99a1db80218873a3446f7ea0850c8e51329f7. 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/KRA381601154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13e8fe02d38c232042eb0bd38fb511b9291a2841b458382134c4eeb68146fac. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:08:10Z), 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/KRA381601157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea50bdf8b8353d05cee59e5b00dd112c3ff062947f85b6942256a62f763bddc. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/KRA381701213.