Cha Soojeong (; born 25 November 1990), better known by her stage name Crystal Tea (), is a South Korean indie rock musician. She has released a studio album High School Musical (하이스쿨 뮤지컬) (2024).
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 0x624482ba964706db2d887e242b94513a53269e4fbaed00514aee90348aa25585. 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/70ae63c1-2d54-440b-a204-b953974c709c.json and https://artists.proofprofile.net/proofs/artist/70ae63c1-2d54-440b-a204-b953974c709c.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 0x4ab532eaa02513ae483fc92dd99a741c915fef0982449e2b30c4d4f7342e71b6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/KRMIM2029727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95d115a22f9e5981480ad850fea9e4df4b0726e8b0023223079777bec020573. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T08:02:29Z), 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/KRMIM2008277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86591616eb94486b4f3fa40c1d6fc1a985a3872163a33d2e508a65fda50cce1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/KRMIM2008278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62cacbbca0f241387ba9e341a6f22325ed17f85b3e3a5054149371b1a01fd07. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/KRMIM2008279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51252c6c2c57e677eb2428624fed92bc808fc6be0c55a1ec2bbb1757a3d939b7. 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/KRMIM2002975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2e379e118a274c6d64db07c2496a1032dc6228703f5b90a88df8836975d7b3. 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/KRMIM2008281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0533dd6e553c37736f259f11211fcc6c6acb68c99894dba0767daa8ebc3d42. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/KRMIM2008282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f05fadcf157f0f52bf911bec42ef23e09df92ce8dd1962bce11488298507f3. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/KRMIM2117736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25af3a80e0c62bc380b919a9884bf09e730ca6a6b0d785e6b06fa89288b1a15. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T18:55:36Z), 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/KRMIM2117738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fcafc588dd880dcb9e72f78dc83be29db616e99340a58592135400c358169d7. 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/KRMIM2230003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd341431a8c14f5bedf075c3fb692f831b5c6e149291b80e3e0999611865e7d. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T11:08:12Z), 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/KSB022400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81b9ba969634a2d54372ea21bd964533de5b4002022654039250dd146622225. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:55:42Z), 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/KRMIM2453946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd566b0491218abe8551be2a7d0847917915cd1437ed12d40ded2588e397aaf. 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/KSB022400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644295ed4aad45fd8077d7846a72aac4f310e2281473df8bb947565312b0e2a2. 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/KRMIM2453940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4b2cf05ad9dc4ac3bef64e1eb84e5ab5f8f9a47b7f2c74a3eb22d7e8ace205. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/KRMIM2453942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0feb1eff397d812c4d192fe621eec631b63ac48aec73c560791255f1f86c1ab. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/KRMIM2453943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fb5715716e52807a05a667aa55c93a2145822ed66ff8b0e2edcc597667bf36. 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/JPPO02104204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5820b7dda2b8ff6d5d3f26f843d130bf119df002a76a7f1e373224301db7722. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWIE12300027.