Ghost9 (; stylized in all caps) is a South Korean boy band formed by Maroo Entertainment in 2020, the group currently consists of seven members: Shin, Son Jung-hyun, Choi Jun-seong, Lee Kang-sung, Pri
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 0xbca821c720d0bcb659047fb5d22cf8a3ee2a184993276569e690eb9d100c29a4. 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/eef86d1a-440d-4e79-9c6b-78877f01f0aa.json and https://artists.proofprofile.net/proofs/artist/eef86d1a-440d-4e79-9c6b-78877f01f0aa.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 0xcf1efaa15db0bba52c62318739e21efec9b5819dc3b4d213d09a75cfb5bda7e6. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/KRD432000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03cb8d341e50f41d6c0c6f2bd45287c68150bc80ee2eee12e55e2ca01e66fc0. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/KRD432000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b04083f653508009352dd4cf8727baf420dae4296151b2896090bc04235c93. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/KRD432000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ccd15ce36a65f18e8ae8498402735eb9c94316002285f2737528a6f90ba09da. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/KRD432000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f096da5ec33e991360ae35fd2177d78077c998912b012314f909e4f174aefc. 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/KRD432000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5727038c7558f687eaacbd0d51f4091bcd36fb1f7d45921ae14a42e52946c3e8. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/KRD432000032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a99fd2e7f9f8854feb39ac39e6a4cfada895aa42682414f614a901ccd7a853. 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/KRD432000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf52709a650bca30faba00449f0262788734a026cf8c3f4293978b4b9935e496. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/KRD432100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86de36b663e34073b381db50591cc31bd0bace204922f6e5d9e752b696b248ad. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/KRD432100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e49ffe03798d4f0b8c7eacb8c44980b140e8158a22f48ca4b44c4c981675a38. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/KRD432100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8df457916d01b97f11496d50d0a12d4b5ac2294b3001610266c9717c11fce05. 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/KRD432100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f56ab6d2a56f524e6cbcf1d2abaad687cb81b70b07ab1aabf0dc778c636250a. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/KRD432100035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e31ef7858d897ae40a4793b6934b1f5cd9bc056327144aed416d0feb082236e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/KRD432100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb390cc8404b7693bc501ca01d9932842911cffab9c9e7845d8accfab21fcb11. 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/KRD432100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495cdf19e246a4ab25027f76ffc80521f7c18cf2a20b7681fb9460569bd982d7. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/KRD432100039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa538f43ef8009b235da99df9ec2775dd5603062d4d717229b22384f7cb998b37. 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/KRD432100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67e11890bc81add5a479cc3abb634bdcba8e1db96dccdcbcdbf01ab5dda5398b. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/KRD432100055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff11b1b294dae36f1daf5ce7970a7b6d4b71c99026bd2e01b8f5f72d1fe271b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/KRD432100058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42324f5561dbea2731d92644c177f35de156dbb4291342382f2b94cda421ebab. 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/KRD432100059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa15d6a07b48350fbd718e9f2ddcb399db243454496b9d96716e495f609762ec. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/KRD432200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d1349f7751c6bc9e1fd1f1310b220dbee30edebe5981f44d8a9c9d56ed9106. 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/KRD432200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c63aa3ca97811de4f898b529dbc191e45803f9f6af696bbbcbdfcc26046f54e. 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/KRD432200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6afbfbeb3e104dec3086d3278fedb12e6143a1c9f3eb56addecebf07db7c02. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/KRD432200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1415fd5c207cdb75dac306f6bcd01907c544374e546905c8d1eb9522b84607a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/KRD432200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf00164cf0445b54a3336e539c79baa9e99fcce6bd4830dda75bc832ba1acd67. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/KRD432200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969ce8c3606537762653ca030b81d21f247b621bd3d5a4457e012e372632a255. 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/KRD432200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9795d09e8d6df39b6c96bda815866c2d9d4732848af91fe0b1e7eda0678518fd. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/KRD432200018.